PRELIMINARY WATER QUALITY MGMT PLAN 2019-11-18Whitewater River Region WQMP
Project Specific
Preliminary Water Quality Management Plan
For: The Wave at Coral Mountain – Tentative Tract Map No. 37815
South of Avenue 58; West of Madison Street, in the City of La Quinta
DEVELOPMENT NO. TBD
Prepared for:
CM Wave Development, L.L.C.
2440 Junction Place, Suite 200
Boulder, CO 80301
Telephone: (480) 367-7576
Prepared By:
Jesus Herrera-Cortes, CPSWQ, QSD/QSP
Prepared Under the Direction of:
Michael Rowe, PE,
MSA Consulting, Inc.
34200 Bob Hope Drive
Rancho Mirage, CA 92270
Telephone: (760) 320-9811
Fax No. (760) 323-7893
Original Date Prepared: November 18, 2019
Revision Date(s): N/A
Whitewater River Region WQMP
The Wave at Coral Mountain
OWNER'S CERTIFICATION
This project-specific Preliminary Water Quality Management Plan (M-WQMP) has been prepared for:
CM Wave Development, L.L.C. by MSA Consulting, Inc. for the project known as The Wave at
Coral Mountain in the City of La Quinta.
This WQMP is intended to comply with the requirements of the City of La Quinta for The Wave at
Coral Mountain, which includes the requirement for the preparation and implementation of a
project-specific WQMP.
The undersigned, while owning the property/project described in the preceding paragraph, shall be
responsible for the implementation of this WQMP and will ensure that this WQMP is amended as
appropriate to reflect up-to-date conditions on the site. This WQMP will be reviewed with the
facility operator, facility supervisors, employees, tenants, maintenance and service contractors, or
any other party (or parties) having responsibility for implementing portions of this WQMP. At least
one copy of this WQMP will be maintained at the project site or project office in perpetuity.
The undersigned is authorized to certify and to approve implementation of this WQMP. The undersigned
is aware that implementation of this WQMP is enforceable under City of La Quinta Water Quality
Ordinance 493 (La Quinta Municipal Code Municipal Code Section 8.70).
If the undersigned transfers its interest in the subject property/project, the un dersigned shall notify
the successor in interest of its responsibility to implement this WQMP.
"I, the undersigned, certify under penalty of law that I am the owner of the property that is the subject
of this WQMP, and that the provisions of this WQMP have been reviewed and accepted and that the
WQMP will be transferred to future successors in interest."
ATTEST
Owner's Signature
Owner's Printed Name
Owner's Title/Position
Date
2440 Junction Place, Suite 200
Boulder, CO 80301
THIS FORM SHALL BE NOTARIZED BEFORE ACCEPTANCE OF THE
FINAL PROJECT SPECIFIC WQMP
Notary Signature
Printed Name
Title/Position
Date
Whitewater River Region WQMP
The Wave at Coral Mountain
November 18, 2019 i
Contents
SECTION PAGE
I. Project Description ......................................................................................................................... 1
II. Site Characterization ..................................................................................................................... 5
III. Pollutants of Concern..................................................................................................................... 7
IV. Hydrologic Conditions of Concern .............................................................................................. 9
V. Best Management Practices ........................................................................................................ 11
V.1 SITE DESIGN BMP CONCEPTS, LID/SITE DESIGN AND TREATMENT CONTROL BMPS .... 11
V.1.A SITE DESIGN BMP CONCEPTS AND LID/SITE DESIGN BMPS ................................. 13
V.1.B TREATMENT CONTROL BMPS ................................................................................ 19
V.1.C MEASURABLE GOAL SUMMARY ............................................................................. 20
V.2 SOURCE CONTROL BMPS ................................................................................................. 22
V.3 EQUIVALENT TREATMENT CONTROL BMP ALTERNATIVES ............................................ 25
V.4 REGIONALLY-BASED BMPS ............................................................................................. 25
VI. Operation and Maintenance Responsibility for BMPs .......................................................... 26
VII. Funding .......................................................................................................................................... 29
TABLES
TABLE 1. POLLUTANT OF CONCERN SUMMARY 7
TABLE 2. BMP SELECTION MATRIX BASED UPON POLLUTANT OF CONCERN REMOVAL EFFICIENCY 12
TABLE 3. IMPLEMENTATION OF SITE DESIGN BMP CONCEPTS 14
TABLE 4. LID/SITE DESIGN BMPS MEETING THE LID/SITE DESIGN MEASURABLE GOAL 18
TABLE 5: TREATMENT CONTROL BMP SUMMARY 19
TABLE 6: MEASURABLE GOAL SUMMARY 21
TABLE 7. SOURCE CONTROL BMPS 22
APPENDICES
A. CONDITIONS OF APPROVAL
B. VICINITY MAP , WQMP SITE PLAN, AND RECEIVING WATERS MAP
C. SUPPORTING DETAIL RELATED TO HYDROLOGIC CONDITIONS OF CONCERN (IF APPLICABLE)
D. EDUCATIONAL MATERIALS
E. SOILS REPORT (IF APPLICABLE)
F. STRUCTURAL BMP AND/OR RETENTION FACILITY SIZING CALCULATIONS AND DESIGN DETAILS
G. AGREEMENTS – CC&RS, COVENANT AND AGREEMENTS, BMP MAINTENANCE AGREEMENTS AND/OR
OTHER MECHANISMS FOR ENSURING ONGOING OPERATION, MAINTENANCE, FUNDING AND
TRANSFER OF REQUIREMENTS FOR THIS PROJECT-SPECIFIC WQMP
H. PHASE 1 ENVIRONMENTAL SITE ASSESSMENT – SUMMARY OF SITE REMEDIATION CONDUCTED AND
USE RESTRICTIONS
I. PROJECT-SPECIFIC WQMP SUMMARY DATA FORM
Whitewater River Region WQMP
The Wave at Coral Mountain
November 18, 2019 1
I. Project Description
Project Owner: CM Wave Development, L.L.C.
2440 Junction Place, Suite 200
Boulder, CO 80301
WQMP Preparer: Under the Direct Supervision of Michael Rowe, PE
MSA Consulting, Inc.
34200 Bob Hope Drive
Rancho Mirage, CA 92270
Telephone: (760) 323-7893
Fax No.: (760) 323-7893
Project Site Address: South of Avenue 58; West of Madison Street
in the City of La Quinta
Planning Area: City of La Quinta Specific Plan 03-067
Community Name: City of La Quinta
Development Name: The Wave at Coral Mountain – TTM No. 37815
APN Number(s): 764-200-076, 764-210-007, 764-210-028, 764-210-029, 766-070-
003, 766-070-006, 766-070-012, 766-070-014, 766-080-001, 766-
080-002, 766-080-004 & 766-080-005
Latitude & Longitude: 33°37’6.7399” North, 116°15’24.7324” West
Receiving Water: Coachella Valley Stormwater Channel
Preliminary WQMP Coverage Area: 305.827 Acres (Drainage Areas A – E)
Standard Industrial Classification (SIC) Code(s):
• SIC not applicable to residential development
• 7999: Amusement and Recreation
• 7011: Hotels (Resort Hotels)
• 5399: Miscellaneous General Merchandise Stores
Formation of Home Owners' Association (HOA)
or Property Owners Association (POA): Y N
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The Wave at Coral Mountain
November 18, 2019 2
Additional Permits/Approvals required for the Project:
AGENCY Permit required
State Department of Fish and Wildlife, Fish and Game
Code §1602 Streambed Alteration Agreement Y N
State Water Resources Control Board, Clean Water Act
(CWA) Section 401 Water Quality Certification Y N
US Army Corps of Engineers, CWA Section 404 permit Y N
US Fish and Wildlife, Endangered Species Act Section 7
biological opinion Y N
Statewide Construction General Permit Coverage Y N
Statewide Industrial General Permit Coverage Y N
Other:
City of La Quinta Grading Permit Y N
• The proposed project activity will not divert or obstruct the natural flow or change
the bed, channel, or bank of any stream, river or lake. Therefore, a State Department
of Fish and Game, 1601 Streambed Alteration Agreement is not required.
• The proposed project activity will not result in discharge into navigable waters or
other impacts; therefore, a Clean Water Act Section 401 Water Quality Certification
permit is not required.
• The proposed facility will not result in the discharge of dredged or fill materials into
the Waters of the United States. A Clean Water Act Section 404 Permit is not
required for this project.
• The proposed project site is not recognized as a habitat of an endangered species nor
does it form part of a Conservation Area under the Coachella Valley Multiple
Species Habitat Conservation Plan. A U.S. Fish and Wildlife, Endangered Species
Act Section 7 biological opinion is not required for this project.
• The proposed project is not industrial in nature. Therefore, coverage under the
General Permit for Storm Water Discharges Associated with Industrial Activities is
not required. This project will obtain coverage under the State Water Board NPDES
General Permit for Storm Water Discharges Associated with Construction and Land
Disturbance Activities.
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The Wave at Coral Mountain
November 18, 2019 3
Project Introduction and Existing Conditions
This preliminary WQMP has been prepared for a portion of The Wave at Coral Mountain
(Tentative Tract Map No. 37815), which forms part of Specific Plan 03-067 as a master-planned
development in the City of La Quinta, County of Riverside. The project area can also be
identified as a portion of Andalusia at Coral Mountain, Amendment V (Specific Plan 03-067).
The project location can be described as south of Avenue 58 and west of Madison Street,
occupying portions Section 27 and 28, Township 6 South, Range 7 East San Bernardino
Meridian.
The level of detail provided in this Preliminary WQMP is consistent with the corresponding
Preliminary Hydrology Report prepared for The Wave at Coral Mountain (Tentative Tract Map
37815). As the site plan and engineering plans progress toward a final design, additional detail
will be provided per the City’s Final WQMP Scope of Work.
As presently observed, the terrain across most of the project area is relatively level with scattered
vegetation coverage due to the past agricultural operations and site clearing activities that
occurred over multiple decades. Only the hillside portions of Coral Mountain on the west edge of
the project have retained a relatively undisturbed condition, which will not be modified by the
project. In addition to the prior modifications from agricultural uses, the site has also been
altered dirt roads, hiking paths, and various underground irrigation lines. The project site has also
been subject to instances of trespassing and off-road vehicular circulation. As such, site drainage
appears to be controlled via sheet flow generally from west to east. Per the Preliminary
Hydrology Report for this site, no groundwater was encountered in any of the exploratory
borings to a depth of 51 feet.
Description of Proposed Improvements
Based on the amended specific plan, the project site that is the subject of this Preliminary
WQMP includes a surf resort (hotel complex), residential units (attached and detached), a wave
pool feature, and other resort-related amenities largely occurring in the form of recreational open
space. The wave pool is an artificial wave basin designed to generate ocean -like waves for
recreational uses by resort guests and residents, as well as providing a venue for competitive and
professional surfing events. The wave pool has also been incorporated into the preliminary
hydrology design to serve as a stormwater retention basin for properly treated runoff.
Hydrologically, the proposed development and preliminary WQMP coverage is divided into five
primary drainage management areas totaling 305.827 acres. T his area calculation includes off-
site tributary flows from hillside rock outcropping and open brush areas west of the project
limits.
Drainage Area A covers approximately 162.171 acres, occupying a western portion of the project
site, where the proposed land uses include residential units, the resort hotel, the corresponding
interior drive aisles, the proposed wave pool, and recreational open space. Of the 162.171 acres
making up this drainage area, approximately 70.893 acres are off-site tributaries with rock out-
cropping and open brush conditions. These areas occur generally west of the project boundary
corresponding to easterly portions of the Coral Mountain natural feature. Based on the current
preliminary engineering design, the existing conditions and proposed improvements will result in
38.874 acres (24%) of impervious cover consisting of interior drive aisles, residential structures,
hotel-related structures, and the corresponding hardscape. The remaining 123.297 acres (76%)
will consist of pervious cover, largely being made up of open space.
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The Wave at Coral Mountain
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Based on these conditions and using the Whitewater Watershed BMP Design Volume Worksheet,
the Design Storage Volume (Vbmp) for Drainage Area A (as a whole) is 45,337 cubic feet.
Runoff from throughout Drainage Area A will be carried to a system of three retention facilities.
Two of these retention facilities will be designed to accept the 10-year storm volumes from
mentioned off-site areas to the west, while the third retention facility will be the wave pool
feature designed to accept stormwater flows from the interior (on-site) portions. The combined
retention capacity provided in Drainage Area A is 3,178,217, which is sufficiently sized to
contain the flood volume resulting from the controlling 100-year storm, as well as the smaller
Vbmp volume for water quality purposes. During the final design process, a more detailed
description will be provided of the sub-areas in Drainage Area A.
Drainage Area B covers approximately 41.586 acres, occupying a northwest portion of the
project site, where the proposed land uses include low-density residential units, recreational open
space, interior streets, and an artificial lake feature. Of the 41.586 acres making up this drainage
area, approximately 17.512 acres (42%) are expected to be impervious cover consisting of
residential structures, interior roads, and the corresponding hardscape. The remaining 24.074
(58%) will consist of pervious cover (open space).
Based on these conditions and using the Whitewater Watershed BMP Design Volume
Worksheet, the Design Storage Volume (Vbmp) for Drainage Area B is 17,613 cubic feet.
Runoff from throughout Drainage Area B will be carried to the centralized artificial lake feature,
which will provide a retention capacity of 292,016 cubic feet to handle the controlling 100 -year
storm event and the previously mentioned Vbmp volume for water quality purposes. During the
Final Design, a more detailed description will be provided for this drainage area.
Drainage Area C covers approximately 10.191 acres, occupying a central portion of the project
site, where the proposed land uses residential units, surf resort units, recreational open space, and
interior streets. Of the 10.191 acres making up this drainage area, approximately 4.419 acres
(43%) are expected to be impervious cover consisting of residential structures, resort structures,
interior roads, and the corresponding hardscape. The remaining 5.772 acres (57%) will consist of
pervious cover (open space).
Based on these conditions and using the Whitewater Watershed BMP Design Volume
Worksheet, the Design Storage Volume (Vbmp) for Drainage Area C is 4,423 cubic feet. Runoff
from throughout Drainage Area C will be carried to a temporary retention basin with a capacity
of 57,966 cubic feet to handle the controlling 100-year storm event and the previously mentioned
Vbmp volume for water quality purposes. During the Final Design, a more detailed description
will be provided for this drainage area.
Drainage Area D covers approximately 28.976 acres, occupying a central portion of the project
site, where the proposed land uses residential units, surf resort units, a portion of the hotel,
recreational open space, interior streets, and an artificial lake feature. Of the 28.976 acres making
up this drainage area, approximately 14.177 acres (49%) are expected to be impervious cover.
The remaining 14.799 acres (51%) will consist of pervious cover (open space).
Based on these conditions and using the Whitewater Watershed BMP Design Volume Worksheet,
the Design Storage Volume (Vbmp) for Drainage Area D is 13,988 cubic feet. Runoff from
throughout Drainage Area C will be carried to a proposed artificial lake feature with a retention
capacity of 168,719 cubic feet to handle the controlling 100-year storm event and the previously
mentioned Vbmp volume for water quality purposes. During the Final Design, a more detailed
description will be provided for this drainage area.
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The Wave at Coral Mountain
November 18, 2019 5
Drainage Area E covers approximately 62.903 acres, occupying an eastern portion of the project
site where the expected land uses will be future low-density residential units. Of the 62.903 acres
making up this drainage area, approximately 19.414 acres (31%) are expected to be impervious
cover. The remaining 43.489 acres (69%) will consist of pervious cover (open space).
Based on these conditions and using the Whitewater Watershed BMP Design Volume
Worksheet, the Design Storage Volume (Vbmp) for Drainage Area E is 20,990 cubic feet.
Runoff from throughout Drainage Area C will be carried to a temporary retentio n basin with a
capacity of 1,216,389 cubic feet to handle the controlling 100-year storm event and the
previously mentioned Vbmp volume for water quality purposes. During the Final Design, a more
detailed description will be provided for this drainage area.
Runoff from throughout the primary project entry driveway will be conveyed to adjacent
landscaped swales sized to contain the corresponding runoff volumes.
Future development within the Specific Plan area is expected to occur in Drainage Areas F, G, H
and I, which have a combined area of 145.728 acres. Based on estimates found in the
Preliminary Hydrology Report, these drainage areas are expected to require a combined 13.7
acre-feet of retention capacity to handle their corresponding runoff volumes. The identification
and area-specific retention sizing will be a function of the site designed to be determined for
these areas. As such, Drainage Areas F, G, H, and I are not covered in the scope of this
Preliminary or subsequent Final WQMP. A separate site design, preliminary engineering and
WQMP will be necessary to cover these areas.
Location of Activities:
The project does not have a specific area where heightened activities would warrant additional
site design, source control or treatment measures other than those identified for each drainage
area. Final WQMP documentation is expected to provide additional detail based on a final site
design and engineering.
Waste Generation:
The proposed project is expected to generate non-hazardous solid waste typical of most
residential and commercial land uses. The project’s waste will be collected and managed by
Burrtec Waste Industries on a typical schedule. Pollution prevention, waste reduction, and
recycling practices will be implemented on-site.
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II. Site Characterization
Land Use Designation or Zoning: Existing General Plan and Zoning:
Specific Plan 03-067
Proposed General Plan & Zoning:
Specific Plan 03-067
Current Property Use: Vacant
Proposed Property Use: Residential, Resort Hotel, Recreational
Availability of Soils Report: Y N
Phase 1 Site Assessment: Y N
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The Wave at Coral Mountain
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Receiving Waters for Urban Runoff from Site
Receiving
Waters
EPA Approved 303(d) List
Impairments
Designated
Beneficial
Uses
Proximity to
RARE Beneficial
Use Designated
Receiving Waters
Coachella
Valley
Stormwater
Channel
DDT (Dichlorodiphenyltrichloroethane),
Dieldrin, Indicator Bacteria, PCBs
(Polychlorinated Biphenyls), Toxaphene,
Toxicity
FRSH, REC I c,
REC II c,
WARM, WILD,
RARE d
Approximately 7.1
miles
The preceding table is based on the 2014 and 2016 Integrated Report (Clean Water Act Section 303(d)
List/305(b) Report. All impairments listed for Coachella Valley Stormwater Channel are under Category 5, which
apply to water segments where standards are not met and a Total Maximum Daily Load (TMDL) is required, but not
yet completed. All pollutant sources for this segment are unknown.
Abbreviations:
I – Intermittent Beneficial Use
FRSH – Freshwater Replenishment
REC I – Water Contact Recreation
REC II – Non-Contact Water Recreation
WARM – Warm Freshwater Habitat
WILD – Wildlife Habitat
RARE – Preservation of Rare, Threatened, or Endangered Species
MUN – Municipal & Domestic Supply
AGR – Agricultural Supply
GWR – Groundwater Recharge
AQUA – Acuaculture
COLD – Cold Freshwater Habitat
POW – Hydropower Generation
a. Although it is not encouraged, children play in the water infrequently on the wildlife reserve
b. Section of perennial flow from approximately Indio to the Salton Sea.
c. Unauthorized use.
d. Rare, endangered, or threatened wildlife exists in or utilizes some of this waterway.
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III. Pollutants of Concern
Table 1. Pollutant of Concern Summary
Pollutant Category
Potential for
Project
Causing Receiving
Water Impairment
Bacteria/Virus (Pathogens) Yes Yes (Pathogens)
Heavy Metals Yes No
Nutrients Yes No
Toxic Organic Compounds Yes Yes
Sediment/Turbidity Yes No
Trash & Debris Yes No
Oil & Grease Yes No
The Coachella Valley Stormwater Channel is impaired by DDT (Dichlorodiphenyltrichloroethane),
Dieldrin, Indicator Bacteria, PCBs (Polychlorinated Biphenyls), Toxaphene, and Toxicity.
• The project is not anticipated to generate DDT contamination because the use of this substance
(synthetic organic compound) has been banned since 1972; therefore, it will not be handled or form
part of the proposed development.
• The project is not anticipated to generate Dieldrin contamination because the use of this substance
(synthetic organic compound) was related to agricultural operations (found in pesticides for crops)
and it has been illegal since 1987; therefore, it will not be handled or form part of the proposed
development.
• The project is not anticipated to produce polychlorinated biphenyls (PCBs) because manufacturing
this substance (synthetic organic compound) stopped in 1977 and its application was banned in 1979;
therefore, it will not be handled or form part of the proposed development.
• The proposed development is not anticipated to produce toxaphene because the use of this substance
(synthetic organic compound) has been illegal since 1990; therefore, it will not be handled or form
part of the proposed development.
• The project has the potential to generate small amounts of pathogens (bacteria/virus). These
pollutants are generally associated with various human activities, but pathogens are also present in
natural environments. Moreover, pathogens can be associated with wild and domesticated animal
waste. Source control measures to address this potential pollutant are discussed in the subsequent
sections of this report. Runoff from the project will be conveyed to proposed retention facilities sized
to capture and infiltrate the controlling 100-year storm event and the design capture volume for water
quality purposes (Vbmp). Therefore, no discharge of pathogens in runoff is expected as part of the
standard operating condition.
• The project is not expected to generate or discharge toxicants, such as toxic metals and synthetic
organic compounds that would result in detrimental physiological responses in human, plant, animal,
or indigenous aquatic life in the Coachella Valley Storm Water Channel. Due to the project’s location
and proposed improvements, the project will not involve direct or indirect discharges into the
Coachella Valley Storm Water Channel. All project runoff will be conveyed to on-site retention
facilities.
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Table 1 (Potential Pollutants Generated by Land Use Type ) of the Riverside County Whitewater
River Region Stormwater Quality Best Management Practice Design Handbook for Low Impac t
Development identifies eight (8) land use categories with their correspondi ng potential pollutants that
may be generated. Based on the allowable land uses under the governing Specific Plan, here are the
comparable land use types pertaining to the mentioned list.
Type of
Development
(Land Use)
Sediment/
Turbidity
Nutrients Toxic
Organic
Compounds
Trash
& Debris
Bacteria &
Viruses
(Also:
Pathogens)
Oil
&
Grease
Heavy
Metals
Detached Residential
Development
P P N P P P N
Attached Residential
Development
P P N P P P(2) N
Restaurants N N N P P P N
Parking Lots P P(1) P(4) P P P P
Commercial Development P P(1) P(5) P P(3) P P(6)
Abbreviations:
P = Potential N = Not potential
Notes:
(1) A potential Pollutant if non-native landscaping exists or is proposed onsite; otherwise not expected.
(2) A potential Pollutant if the project includes uncovered parking areas; otherwise not expected.
(3) A potential Pollutant if land use involves food or animal waste products.
(4) Specifically, petroleum hydrocarbons.
(5) Specifically, solvents; however, this Pollutant is not expected at commercial office or commercial retail sites, unless said retail is vehicle
related.
(6) A potential Pollutant if the project includes outdoor storage or metal roofs; otherwise not expected.
Potential Project Pollutants: The project’s land uses have the generalized potential to produce
sediment/turbidity; nutrients; toxic organic compounds; trash and debris; bacteria and viruses
(including pathogens); oil and grease; and heavy metals.
Legacy Pollutants: There is no evidence or other known information of legacy pollutants on-site.
Pollutants of Concern: Based on the comparison of potential project pollutants with the pollutant
categories causing receiving water impairments, the pollutants of concern include bacteria/virus.
The project’s proposed storm drain improvements are designed to intercept and retai n the flood
volume resulting from the 100-year storm event. Therefore, the project will not produce pollutants
that could affect off-site or downstream resources, such as the proximate receiving waters.
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IV. Hydrologic Conditions of Concern
Local Jurisdiction Requires On-Site Retention of Urban Runoff:
Yes The project will be required to retain urban runoff onsite in conformance with local ordinance
(See Table 6 of the WQMP Guidance document, "Local Land use Authorities Requiring
Onsite Retention of Stormwater"). This section does not need to be completed; however,
retention facility design details and sizing calculations must be included in Appendix F.
Note: The Preliminary WQMP and corresponding Preliminary Hydrology Report for
this project have identified five (5) drainage management areas (A through E) with the
respective required capacity for retaining the flood volume resulting from the 100-year
controlling storm event for the corresponding on-site and off-site tributary conditions.
The necessary retention capacity will be met through retention facilities at each
drainage management area, the details of which will be demonstrat ed in the Final
WQMP and Final Hydrology Report. As a result, the project will not result in changes
to the hydrologic regime that will permanently impact downstream channels, receiving
waters, or habitat integrity. No Hydrologic Conditions of Concern are expected to result
from the project. The local jurisdiction requirements for on-site retention of urban
runoff will be met.
No This section must be completed.
This Project meets the following condition:
Condition A: 1) Runoff from the Project is discharged directly to a publicly-owned,
operated and maintained MS4 or engineered and maintained channel, 2) the discharge is in
full compliance with local land use authority requirements for connections and discharges to
the MS4 (including both quality and quantity requirements), 3) the discharge would not
significantly impact stream habitat in proximate Receiving Waters, and 4) the discharge is
authorized by the local land use authority.
Condition B: The project disturbs less than 1 acre and is not part of a larger common plan
of development that exceeds 1 acre of disturbance. The disturbed area calculation must
include all disturbances associated with larger plans of development.
Condition C: The project's runoff flow rate, volume, velocity and duration for the post-
development condition do not exceed the pre-development condition for the 2-year, 24-hour
and 10-year 24-hour rainfall events. This condition can be achieved by, where applicable,
complying with the local land use authority's on-site retention ordinance, or minimizing
impervious area on a site and incorporating other Site-Design BMP concepts and LID/Site
Design BMPs that assure non-exceedance of pre-development conditions. This condition
must be substantiated by hydrologic modeling methods acceptable to the local land use
authority.
None: Refer to Section 3.4 of the Whitewater River Region WQMP Guidance document for
additional requirements.
Supporting engineering studies, calculations, and reports are included in Appendix C.
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The Wave at Coral Mountain
November 18, 2019 11
V. Best Management Practices
This project implements Best Management Practices (BMPs) to address the Pollutants of
Concern that may potentially be generated from the use of the project site. These BMPs have
been selected and implemented to comply with Section 3.5 of the WQMP Guidance document,
and consist of Site Design BMP concepts, Source Control, LID/Site Design and, if/where
necessary, Treatment Control BMPs as described herein.
V.1 SITE DESIGN BMP CONCEPTS, LID/SITE DESIGN AND TREATMENT
CONTROL BMPS
Local Jurisdiction Requires On-Site Retention of Urban Runoff:
Yes The project will be required to retain Urban Runoff onsite in conformance with local
ordinance (See Table 6 of the WQMP Guidance document, "Local Land use Authorities
Requiring Onsite Retention of Stormwater). The LID/Site Design measurable goal has
thus been met (100%), and Sections V.1.A and V.1.B do not need to be completed;
however, retention facility design details and sizing calculations must be included in
Appendix F, and '100%' should be entered into Column 3 of Table 6 below.
Note: The Preliminary WQMP and corresponding Preliminary Hydrology Report for
this project have identified five (5) drainage management areas (A through E) with the
respective required capacity for retaining the flood volume resulting from the 100-year
controlling storm event for the corresponding on-site and off-site tributary conditions.
The necessary retention capacity will be met through retention facilities at each
drainage management area, the details of which will be demonstrat ed in the Final
WQMP and Final Hydrology Report. As a result, the project will not result in changes
to the hydrologic regime that will permanently impact downstream channels, receiving
waters, or habitat integrity. No Hydrologic Conditions of Concern are expected to result
from the project. The local jurisdiction requirements for on-site retention of urban
runoff will be met.
No Section V.1 must be completed.
This section of the Project-Specific WQMP documents the LID/Site Design BMPs and, if/where
necessary, the Treatment Control BMPs that will be implemented on the project to meet the requirements
detailed within Section 3.5.1 of the WQMP Guidance document. Section 3.5.1 includes requirements to
implement Site Design Concepts and BMPs, and includes requirements to address Pollutants of Concern
with BMPs. Further, sub-section 3.5.1.1 specifically requires that Pollutants of Concern be addressed with
LID/Site Design BMPs to the extent feasible.
LID/Site Design BMPs are those BMPs listed within Table 2 below which promote retention and/or
feature a natural treatment mechanism; off-site and regionally-based BMPs are also LID/Site Design
BMPs, and therefore count towards the measurable goal, if they fit these criteria. This project
incorporates LID/Site Design BMPs to fully address the Treatment Control BMP requirement where and
to the extent feasible. If and where it has been acceptably demonstrated to the local land use authority that
it is infeasible to fully meet this requirement with LID/Site Design BMPs, Section V.1.B (below) includes
a description of the conventional Treatment Control BMPs that will be substituted to meet the same
requirements. In addressing Pollutants of Concern, BMPs are selected using Table 2 below.
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November 18, 2019 12
Table 2. BMP Selection Matrix Based Upon Pollutant of Concern Removal Efficiency (1)
(Sources: Riverside County Flood Control & Water Conservation District Design Handbook for Low Impact Development Best Management Practices, dated September 2011, the
Orange County Technical Guidance Document for Water Quality Management Plans, dated May 19, 2011, and the Caltrans Treatment BMP Technology Report, dated April 2010
and April 2008)
Pollutant of
Concern Landscape Swale2, 3 Landscape Strip2, 3 Biofiltration (with underdrain)2, 3 Extended Detention Basin2 Sand Filter Basin2 Infiltration Basin2 Infiltration Trench2 Permeable Pavement2 Bioretention (w/o underdrain)2, 3 Other BMPs Including Proprietary BMPs4, 6 Sediment &
Turbidity M M H M H H H H H Varies by Product5 Nutrients L/M L/M M L/M L/M H H H H
Toxic Organic
Compounds M/H M/H M/H L L/M H H H H
Trash & Debris L L H H H H H L H
Bacteria & Viruses
(also: Pathogens) L M H L M H H H H
Oil & Grease M M H M H H H H H
Heavy Metals M M/H M/H L/M M H H H H
Abbreviations:
L: Low removal efficiency M: Medium removal efficiency H: High removal efficiency
Notes:
(1) Periodic performance assessment and updating of the guidance provided by this table may be necessary.
(2) Expected performance when designed in accordance with the most current edition of the document, "Riverside
County, Whitewater River Region Stormwater Quality Best Management Practice Design Handbook".
(3) Performance dependent upon design which includes implementation of thick vegetative cover. Local water
conservation and/or landscaping requirements should be considered; approval is based on the discretion of the
local land use authority.
(4) Includes proprietary stormwater treatment devices as listed in the CASQA Stormwater Best Management Practices
Handbooks, other stormwater treatment BMPs not specifically listed in this WQMP (including proprietary filters,
hydrodynamic separators, inserts, etc.), or newly developed/emerging stormwater treatment technologies.
(5) Expected performance should be based on evaluation of unit processes provided by BMP and available testing
data. Approval is based on the discretion of the local land use authority.
(6) When used for primary treatment as opposed to pre-treatment, requires site-specific approval by the local land use
authority.
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V.1.A SITE DESIGN BMP CONCEPTS AND LID/SITE DESIGN BMPS
Note: This section is not applicable Due to conformance with local retention ordinance per
Section 3.5.1.2 of Whitewater River Region WQMP Guidance Document.
This section documents the Site Design BMP concepts and LID/Site Design BMPs that will be
implemented on this project to comply with the requirements detailed in Section 3.5.1 of the
WQMP Guidance document.
• Table 3 herein documents the implementation of the Site Design BMP Concepts
described in sub-sections 3.5.1.3 and 3.5.1.4.
• Table 4 herein documents the extent to which this project has implemented the LID/Site
Design goals described in sub-section 3.5.1.1.
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Table 3. Implementation of Site Design BMP Concepts
Note: Completion of this sub-section is not required since the project retains urban runoff on-site in conformance with the local ordinances.
Included
Brief Reason for BMPs
Indicated as No or N/A
Design
Concept Technique Specific BMP Yes No N/A Site Design BMP Concept 1 Minimize Urban
Runoff,
Minimize
Impervious
Footprint, and
Conserve
Natural Areas
(See WQMP
Section 3.5.1.3)
Conserve natural areas by concentrating or clustering development on
the least environmentally sensitive portions of a site while leaving the
remaining land in a natural, undisturbed condition.
Conserve natural areas by incorporating the goals of the Multi-Species
Habitat Conservation Plan or other natural resource plans.
Preserve natural drainage features and natural depressional storage
areas on the site.
Maximize canopy interception and water conservation by preserving
existing native trees and shrubs, and planting additional native or
drought tolerant trees and large shrubs.
Use natural drainage systems.
Where applicable, incorporate Self-Treating Areas
Where applicable, incorporate Self-Retaining Areas
Increase the building floor to area ratio (i.e., number of stories above or
below ground).
Construct streets, sidewalks and parking lot aisles to minimum widths
necessary, provided that public safety and a walkable environment for
pedestrians are not compromised.
Reduce widths of streets where off-street parking is available.
Minimize the use of impervious surfaces, such as decorative concrete, in
the landscape design.
Other comparable and equally effective Site Design BMP concept(s) as
approved by the local land use authority (Note: Additional narrative
required to describe BMP and how it addresses site design concept).
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The Wave at Coral Mountain
November 18, 2019 15
Table 3. Site Design BMP Concepts (continued)
Note: Completion of this sub-section is not required since the project retains urban runoff on-site in conformance with the local ordinances.
Included
Brief Reason for Each BMP
Indicated as No or N/A Design
Concept Technique Specific BMP Yes No N/A Site Design BMP Concept 2 Minimize
Directly
Connected
Impervious
Area
(See WQMP
Section
3.5.1.4)
Design residential and commercial sites to contain and infiltrate roof runoff, or
direct roof runoff to landscaped swales or buffer areas.
Drain impervious sidewalks, walkways, trails, and patios into adjacent
landscaping.
Incorporate landscaped buffer areas between sidewalks and streets.
Use natural or landscaped drainage swales in lieu of underground piping or
imperviously lined swales.
Where soil conditions are suitable, use perforated pipe or gravel filtration pits
for low flow infiltration.
Maximize the permeable area by constructing walkways, trails, patios,
overflow parking, alleys, driveways, low-traffic streets, and other low-traffic
areas with open-jointed paving materials or permeable surfaces such as
pervious concrete, porous asphalt, unit pavers, and granular materials.
Use one or more of the following:
Rural swale system: street sheet flows to landscaped swale or gravel
shoulder, curbs used at street corners, and culverts used under driveways and
street crossings.
Urban curb/swale system: street slopes to curb; periodic swale inlets drain to
landscaped swale or biofilter.
Dual drainage system: first flush captured in street catch basins and
discharged to adjacent vegetated swale or gravel shoulder; high flows connect
directly to MS4s.
Other comparable and equally effective Site Design BMP concept(s) as
approved by the local land use authority (Note: Additional narrative required to
describe BMP and how it addresses site design concept).
Use one or more of the following for design of driveways and private residential parking areas:
Design driveways with shared access, flared (single lane at street), or wheel
strips (paving only under the tires).
Uncovered temporary or guest parking on residential lots paved with a
permeable surface, or designed to drain into landscaping.
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Table 3. Site Design BMP Concepts (continued)
Note: Completion of this sub-section is not required since the project retains urban runoff on-site in conformance with the local ordinances.
Included
Brief Reason for Each BMP
Indicated as No or N/A Design
Concept Technique Specific BMP Yes No N/A Site Design BMP Concept 2 (cont'd)
Minimize
Directly
Connected
Impervious
Area
(See WQMP
Section
3.5.1.4)
Other comparable and equally effective Site Design BMP concept(s) as
approved by the local land use authority (Note: Additional narrative required to
describe BMP and how it addresses site design concept).
Use one or more of the following for design of parking areas:
Where landscaping is proposed in parking areas, incorporate parking area
landscaping into the drainage design.
Overflow parking (parking stalls provided in excess of the Permittee's
minimum parking requirements) may be constructed with permeable
pavement.
Other comparable and equally effective Site Design BMP (or BMPs) as
approved by the local land use authority (Note: Additional narrative required
describing BMP and how it addresses site design concept).
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Project Site Design BMP Concepts:
Note: This section is not applicable Due to conformance with local retention ordinance per
Section 3.5.1.2 of Whitewater River Region WQMP Guidance Document.
Alternative Project Site Design BMP Concepts:
Not Applicable
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Table 4. LID/Site Design BMPs Meeting the LID/Site Design Measurable Goal
(1) (2) (3) (4) (5) (6) (7)
DRAINAGE
SUB-AREA
ID OR NO.
LID/SITE DESIGN
BMP TYPE*
POTENTIAL
POLLUTANTS OF
CONCERN WITHIN
DRAINAGE SUB-AREA
POTENTIAL POLLUTANTS
WITHIN SUB-AREA
CAUSING RECEIVING
WATER IMPAIRMENTS
EFFECTIVENESS OF LID/SITE
DESIGN BMP AT ADDRESSING
IDENTIFIED POTENTIAL
POLLUTANTS
BMP MEETS WHICH DESIGN
CRITERIA?
TOTAL AREA
WITHIN
DRAINAGE SUB-
AREA
(See Table 2) (Refer to Table 1) (Refer to Table 1) (U, L, M, H/M, H; see Table 2) (Identify as VBMP OR QBMP) (Nearest 0.1 acre)
Area A Infiltration BMP
(Retention Basin) Bacteria/virus Bacteria/virus H
45,337 CU. FT. (VBMP)
Retention Capacity Provided:
3,178,217 CU. FT.
162.171
Area B Artificial Lake
Retention Bacteria/virus Bacteria/virus H
17,613 CU. FT. (VBMP)
Retention Capacity Provided:
292,016 CU. FT.
41.512
Area C Infiltration BMP
(Retention Basin) Bacteria/virus Bacteria/virus H
4,423 CU. FT. (VBMP)
Retention Capacity Provided:
57,966 CU. FT.
10.191
Area D Artificial Lake
Retention Bacteria/virus Bacteria/virus H
13,988 CU. FT. (VBMP)
Retention Capacity Provided:
168,719 CU. FT.
28.976
Area E Infiltration BMP
(Retention Basin) Bacteria/virus Bacteria/virus H
20,990 CU. FT. (VBMP)
Retention Capacity Provided:
1,216,389 CU. FT.
62.903
TOTAL PROJECT AREA TREATED WITH LID/SITE DESIGN BMPs (NEAREST 0.1 ACRE) 307.755
* LID/Site Design BMPs listed in this table are those that completely address the 'Treatment Control BMP requirement' for their
drainage sub-area.
Note: This Preliminary WQMP covers drainage areas A through E. The development of drainage areas F through I will be covered by a
separate WQMP based on a corresponding future site design. Conformance with the local retention requirements will be satisfied by
conveying project runoff into proposed on-site retention facilities.
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Justification of infeasibility for sub-areas not addressed with LID/Site Design BMPs
Not applicable.
V.1.B TREATMENT CONTROL BMPS
Conventional Treatment Control BMPs shall be implemented to address the project's Pollutants
of Concern as required in WQMP Section 3.5.1 where, and to the extent that, Section V.1.A has
demonstrated that it is infeasible to meet these requirements through implementation of LID/Site
Design BMPs.
The LID/Site Design BMPs described in Section V.1.A of this project-specific WQMP
completely address the 'Treatment Control BMP requirement' for the entire project site
(and where applicable, entire existing site) as required in Section 3.5.1.1 of the WQMP
Guidance document. Supporting documentation for the sizing of these LID/Site Design
BMPs is included in Appendix F. *Section V.1.B does not need to be completed.
Note: The project includes a system of on-site retention basins sized to
retain/infiltrate the volume resulting from the 100-year controlling storm event at
each on-site tributary area. As such, the proposed on-site retention capacity will also
be sufficient to handled the corresponding Vbmp volume for water quality
purposes.
The LID/Site Design BMPs described in Section V.1.A of this project-specific WQMP
do NOT completely address the 'Treatment Control BMP requirement' for the entire
project site (or where applicable, entire existing site) as required in Section 3.5.1.1 of the
WQMP. *Section V.1.B must be completed.
The Treatment Control BMPs identified in this section are selected, sized and implemented to
treat the design criteria of VBMP and/or QBMP for all project (and if required, existing site)
drainage sub-areas which were not fully addressed using LID/Site Design BMPs. Supporting
documentation for the sizing of these Treatment Control BMPs is included in Appendix F.
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Table 5: Treatment Control BMP Summary
(1) (2) (3) (4) (5) (6) (7)
DRAINAGE
SUB-AREA
ID OR NO.
TREATMENT
CONTROL BMP
TYPE*
POTENTIAL
POLLUTANTS OF
CONCERN WITHIN
DRAINAGE SUB-AREA
POTENTIAL
POLLUTANTS
WITHIN SUB-AREA
CAUSING
RECEIVING
WATER
IMPAIRMENTS
EFFECTIVENESS OF
TREATMENT
CONTROL BMP AT
ADDRESSING
IDENTIFIED
POTENTIAL
POLLUTANTS
BMP MEETS
WHICH
DESIGN
CRITERIA?
TOTAL
AREA
WITHIN
DRAINAGE
SUB-AREA
(See Table 2) (Refer to Table 1) (Refer to Table 1) (U, L, M, H/M, H; see Table
2)
(Identify as
VBMP OR QBMP)
(Nearest 0.1
acre)
N/A N/A N/A N/A N/A N/A N/A
TOTAL PROJECT AREA TREATED WITH TREATMENT CONTROL BMPs (NEAREST 0.1 ACRE) N/A
Note: Conformance with the local retention requirements will be satisfied by conveying project runoff into proposed on-site retention
facilities.
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V.1.C MEASURABLE GOAL SUMMARY
This section documents the extent to which this project has met the measurable goal described in
WQMP Section 3.5.1.1 of addressing 100% of the project's 'Treatment Control BMP
requirement' with LID/Site Design BMPs. Projects required to retain Urban Runoff onsite in
conformance with local ordinance are considered to have met the measurable goal; for these
instances, '100%' is entered into Column 3 of the Table.
Table 6: Measurable Goal Summary
(1) (2) (3)
Total Area Treated with
LID/Site Design BMPs
Total Area Treated with
Treatment Control BMPs % of Treatment Control BMP
Requirement addressed with
LID/Site Design BMPs (Last row of Table 4) (Last row of Table 5)
305.753
(Drainage Areas A
through E)
N/A
Due to conformance with local
retention ordinance per Section
3.5.1.2 of Whitewater River
Region WQMP Guidance
Document.
100
Note: This Preliminary WQMP covers drainage areas A through E. The development of
drainage areas F through I will be covered by a separate WQMP based on a corresponding
future site design. Conformance with the local retention requirements will be satisfied by
conveying project runoff into proposed on-site retention facilities.
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V.2 SOURCE CONTROL BMPS
This section identifies and describes the Source Control BMPs applicable and implemented on
this project.
Table 7. Source Control BMPs
BMP Name
Check One If not applicable, state
brief reason Included Not
Applicable
Non-Structural Source Control BMPs
Education for Property Owners, Operators,
Tenants, Occupants, or Employees
Activity Restrictions
Irrigation System and Landscape Maintenance
Common Area Litter Control
Street Sweeping Private Streets and Parking Lots
Drainage Facility Inspection and Maintenance
Structural Source Control BMPs
Storm Drain Inlet Stenciling and Signage
Landscape and Irrigation System Design
Protect Slopes and Channels
Provide Community Car Wash Racks Not part of the proposed project.
Properly Design*:
Fueling Areas
Air/Water Supply Area Drainage
Trash Storage Areas
Loading Docks Not part of the proposed project.
Maintenance Bays Not part of the proposed project.
Vehicle and Equipment Wash Areas Not part of the proposed project.
Outdoor Material Storage Areas Not part of the proposed project.
Outdoor Work Areas or Processing Areas Not part of the proposed project.
Provide Wash Water Controls for Food
Preparation Areas
Pursuant to Section E.4.b.v of
the Whitewater River Region
MS4, discharges from food-
related wastes into the storm
drain system or MS4 are
prohibited.
*Details demonstrating proper design must be included in Appendix F.
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Non-Structural Source Control BMPs
Education Program: (Property management/operator)
Employees, maintenance staff, and residents should be informed on topics related to stormwater
pollution and prevention through various means, which can include the distribution of printed
materials or public posting of rules or activity restrictions. A series of guidelines should be
formulated and promoted to communicate beneficial habits and restricting activities which could
impact the storm drain system. Appendix D includes samples of the educational materials that
can be used in implementing this project-specific WQMP.
Activity Restrictions: (Property management/operator)
The following activities should be prevented or prohibited on-site: littering; discharge and waste
dumping into parking storm drain inlets; blowing, sweeping or hosing of debris into streets or
parking lots; nuisance water flows from irrigation.
Irrigation System and Landscape Maintenance: (Property management/operator)
Operation and Maintenance responsibilities and scheduling should be adhered to throughout th e
life of the project. The irrigation and landscape maintenance will help increase the effectiveness
of these systems and minimize the amount of runoff that enters the storm drain system. Erosion
and the conveyance of pesticides/fertilizers in runoff should also be prevented through proper
routine maintenance. Routine irrigation system and landscape maintenance will also serve as a
vector control measure due to the minimization of nuisance water runoff and stagnation.
Common Area Litter Control: (Property management/operator)
Common area litter control should be implemented to reduce pollution in runoff. Routine or
scheduled monitoring should be performed in the common areas, landscaped areas, parking lots,
in and around the trash enclosures, and along the perimeter walls of the project. Any observed
accumulated trash, vegetation debris or improper disposal should be addressed promptly by the
designated staff. Common area litter control measures can be coordinated and improved by the
landscaping maintenance that will take place at the site. The raking or sweeping of trash shall
only be performed in manner that avoids trash from entering the storm drain system. All
landscape-related debris or maintenance deficiencies are to be corrected promptly.
Paved Area Sweeping and Cleaning: (Property management/operator)
Paved area sweeping and cleaning should be performed on-site on a routine basis to prevent
trash, sediment, and other debris from being conveyed into the on-site storm drain system. Paved
area sweeping should be performed during dry weather and the frequency should be flexible to
accommodate climate conditions and areas of concern. Street sweeping equipment must be
operated only by trained personnel based on the manufacturer’s specifications. Street sweeping
equipment should be properly maintained off-site by the operator. All collected debris must be
taken to an approved permanent disposal site.
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Structural Source Control BMPs
The project will incorporate measures to discourage illegal dumping in the proposed private
storm drain system.
• MS4 Stenciling: (Property management/operator)
At each storm drain inlet, a stencil or fixed sign (including medallions) should contain a
brief statement that prohibits dumping of improper materials into the urban runoff
conveyance system. The legibility of markers and signs should be maintained throughout
the life of the project.
• Rules and Regulations: (Property management/operator)
The management should establish and implement rules that prohibit improper non-
stormwater discharge into the storm drain system. This measure may also be considered
non-structural and form part of the activity restrictions associated with the site’s standard
operating procedures.
• Signage at the Trash Enclosures: (Property management/operator)
Language prohibiting illegal dumping into the storm drain system should be integrated in
the signage posted on the side of trash enclosures with the intent to discourage trash and
waste misplacement that could ultimately impact the on-site storm drain system.
Landscape and Irrigation System Design: (Property management/operator)
The site’s structural source control BMP involves an efficient landscape irrigation design. The
system will include native or drought-tolerant plants and mechanisms to minimize excess
irrigation and nuisance water into the stormwater conveyance system while working to reduce
soil amendments and irrigation frequency. The system should also minimize the conveyance of
landscape related chemicals, including pesticides.
Trash Containers: (Property management/operator)
Trash containers shall be leak proof and have attached covers or lids. Connection of trash to the
MS4 shall be prohibited.
Storm Drain System Facilities: (Property management/operator)
Storm drain inlets and storm drainage facilities on-site should be inspected, cleaned, and
maintained routinely. Maintenance staff should take prompt action to correct or repair
malfunctioning facilities.
Safer Alternative Products (CASQA SC-35): (Property management/operator)
The use of less harmful products as alternatives to chemical fertilizers, pesticides, cleaning
solutions, janitorial chemicals, and consumables will be pursued under the guidance of SC-35
primarily aimed at the commercial portions of the project. The objective of this Source Contro l
BMP will be to integrate the measures as much as possible with the future programs at this
facility.
Building and Grounds Maintenance (CASQA SC-41): (Property management/operator)
A series of maintenance practices can be implemented to prevent or reduce the discharge of
potential pollutants into the storm drain system resulting from building and grounds maintenance
activities. The BMP implementation will be achieved with the following guidelines under SC-41:
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November 18, 2019 25
washing and cleaning up with as little water as possible; following good landscape management
practices; preventing and cleaning up spills immediately; keeping debris from entering the storm
drains; and properly maintaining the stormwater collection system.
Protection of Slopes and Channels: (Property management/operator)
Landscaping improvements will help stabilize the proposed landscaped areas and prevent
erosion. These areas will be subject to routine maintenance to address potential instances of soil
erosion. Basin slopes should be visually inspected on a quarterly basis and after major rainfall
events. Physical obstructions caused by vegetation debris or littering should be cleared to ensure
that the slopes continue to function as designed. Any material collected (e.g. landscape debris or
trash) should be properly handled and disposed of.
Note about Wash Water Controls for Food Preparation Areas: Pursuant to Section E.4.b.v of
the Whitewater River Region MS4, illicit discharges to the MS4 of food -related wastes (e.g.
grease, fish processing, and restaurant kitchen mat and trash bin water, etc.) are prohibited. Food
preparation areas (per State Health & Safety Code 27520) shall have either contained areas or
sinks, each with connections to the sanitary sewer for disposal of wash waters containing kitchen
and food wastes. The entry of wash water controls into urban runoff or the proposed storm drain
system is prohibited.
V.3 EQUIVALENT TREATMENT CONTROL BMP ALTERNATIVES
Not applicable.
V.4 REGIONALLY-BASED BMPS
Not Applicable
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VI. Operation and Maintenance Responsibility for
BMPs
The Final WQMP shall include the applicable copies of the mechanisms used to ensure the ongoing
operation, maintenance, funding, transfer and implementation of the project -specific WQMP
requirements.
TABLE 8 -OPERATIONS AND MAINTENANCE
BMP Requiring
Maintenance
Party
Responsibility
Recommended
Inspection and
Maintenance
Frequency
Recommended
Self-Inspection and
Record Keeping
Implementation
Period Recommended
O & M
Activities and
Process
Landscaped Areas
Property Owner,
Operator, Hired
Management,
Home Owner’s
Association
At least twice
monthly or according
to a maintenance
schedule.
Quarterly summaries of
inspection and maintenance
activities should be
appended to the WQMP.
Post-Construction
(See the following
page)
Irrigation System
Property Owner,
Operator, Hired
Management,
Home Owner’s
Association
At least twice
monthly or according
to a maintenance
schedule.
Trash Enclosures
and Common Area
Litter Control
Property Owner,
Operator, Hired
Management,
Home Owner’s
Association
Based on trash pick-
up intervals and
according to a
maintenance
schedule.
Paved Area
Sweeping
Property Owner,
Operator, Hired
Management,
Home Owner’s
Association
Twice monthly or
according to a
maintenance
schedule
Storm Drain System
Property Owner,
Operator, Hired
Management,
Home Owner’s
Association
Quarterly and
after storm events or
according to a
maintenance
schedule
Retention Basins
Property Owner,
Operator, Hired
Management,
Home Owner’s
Association
Quarterly and
after storm events or
according to an
established
maintenance
schedule
*Note: “Storm events” refer to precipitation events producing 0.5 inches of rain or greater within a 48-hour period. The occurrence of these
events may be confirmed against the local rain event summaries published in the National Weather Service or National Oceanic and
Atmospheric Administration web site (www.noaa.gov). The recommended inspection, maintenance, and recordkeeping practices in this
WQMP may be addressed by a formal schedule, operations manual, and other standard operating procedures which may be developed for
this site.
Note: The maintenance recommendations, including responsible parties, inspection intervals, and
maintenance intervals, and activities are not intended to be exhaustive in nature and should not
serve as the sole source of on-site operating procedures. As the Final WQMP documentation is
produced for City review and approval, additional maintenance procedures may be necessary to
implement. Where applicable, refer to the equipment manufacturer’s recommendations.
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Description of Maintenance Requirements:
Landscaped Areas: All trimming, pruning, and removal of fallen organic material from plants,
shrubs, and trees should be collected per an approved or adopted landscape maintenance plan,
stored in an appropriate location and transported to an approved green-waste collection facility.
Any equipment or material temporarily staged during maintenance activities should be placed
away from drainage courses and storm drain inlets. Contracted maintenance staff should haul
collected material promptly following the maintenance activities to avoid prolonged on-site
storage. The planting materials are to remain as indicated on the approved set of landscape
planting plans. In conjunction with the routine activities, maintenance staff should verify that the
landscape design continues to function properly by adjusting to eliminate overspray to hardscape
areas and to verify that irrigation timing and cycle lengths are adjusted in accordance with water
demands, given the time of year, weather and day or nighttime temperatures.
Irrigation Systems: Water conservation is to be maintained at all times per the approved
irrigation plans. Monitoring of the irrigation system should be provided as necessary to ensure
that appropriate watering levels are maintained and to verify that no piping or irrigation heads
are leaking. Any debris, sediment, mineral and grit deposits should be removed from the
irrigation system at regular intervals to provide consistent watering levels.
The irrigation and landscape maintenance will help increase the effectiveness of these systems
and minimize the amount of runoff that enters the storm drain system. Erosion and the
conveyance of pesticides/fertilizers in runoff will also be prevented through routine maintenance.
Routine irrigation system and landscape maintenance will also serve as a vector control measure
due to the minimization of nuisance water runoff and stagnation.
Trash Management and Common Area Litter Control: Common area litter control should be
implemented to reduce pollution in runoff. Routine or scheduled monitoring should be
performed in the common areas, landscaped areas, parking lots, in and around the trash
enclosures, and along the perimeter walls of the project. Any observed accumulated trash,
vegetation debris or improper disposal should be addressed promptly by the designated staff.
Common area litter control measures can be coordinated and improved by the landscaping
maintenance that will take place at the site. All landscape-related debris or maintenance
deficiencies are to be corrected immediately. No trash should be allowed to be stored at the base
of the containers. Pick-up intervals are to be determined so that the containers are not overfilled.
Only approved materials and chemicals should be allowed in the dumpsters.
Storm Drain System: Storm water conveyance systems, including inlets, outlets, cleanouts,
manholes and pipelines within the project are to be inspected quarterly and after each major
storm event or according to a maintenance schedule. All parts of the system are to be
periodically cleaned to ensure that the system works properly during any storm event. Any waste
collected from the cleaning activities is to be stored and properly disposed of.
Paved Area Sweeping and Cleaning
Paved area sweeping and cleaning should be performed on-site, specifically in the parking areas,
to prevent sediment, litter and other debris from being washed by runoff into the on-site storm
drain system. Paved area sweeping should be performed during dry weather if possible and the
frequency should be flexible to accommodate climate conditions and areas of concern. Street
sweeping equipment must be operated only by trained personnel based on the manufacturer’s
specifications. Street sweeping equipment should be properly maintained off-site by the operator.
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November 18, 2019 28
Sweeping equipment should not be maintained or washed off on-site. All collected debris must
be taken to an approved permanent disposal site.
Retention Basins: Retention basins should be visually inspected on a quarterly basis or
according to a landscaping maintenance schedule. Physical obstructions caused by vegetation
debris or littering should be promptly cleared to ensure that the basins continue to function as
designed. An y material collected (e.g. landscape debris or trash) should be properly handled and
disposed of. Basin outlets must be inspected for signs of erosion or obstruction. The condition
and effectiveness of the basin infiltration will depend in part on the main tenance procedures,
such as those outlined below.
Before annual storm seasons and following rainfall events producing precipitation of 0.5 inches
or more:
• Maintain landscaping and irrigation system as needed.
• Remove debris and litter from the entire basin to minimize clogging and improve
aesthetics.
• Inspect for obvious problems and repair as needed. Address odor, insects, and
overgrowth issues associated with stagnant or standing water in the basin bottom. No
standing water should be present longer than 72 hours.
• Check for erosion and sediment laden areas in the basin. Repair as needed.
• Re-stabilize the basin slopes as needed.
Perform the following inspection procedures within 72 hours after a rainfall event producing
precipitation of 0.5 inches or greater:
• Examine the tributary inlet for blockage, the embankment and spillway integrity, as well
as damage to any structural element.
• Check for erosion, slumping and overgrowth. Repair as needed.
• Check basin depth for sediment build up and reduced total capacity. Scrape bottom as
needed and remove sediment. Restore to original cross‐section and infiltration rate.
Replant basin vegetation.
• No water should be present 72 hours after a rainfall event. No long-term standing water
should be present at all. No algae formation should be visible.
Record Keeping: A copy of this project-specific WQMP shall be maintained on-site or remotely
by the project owner or operator (Property Manager). Records of maintenance shall be appended
to this WQMP based on the information provided by the contracted management.
Whitewater River Region WQMP
The Wave at Coral Mountain
November 18, 2019 29
VII. Funding
The funding source for operation and maintenance of each BMP identified in the Project Specific
Preliminary Water Quality Management Plan shall be the responsibilit y of CM Wave
Development, L.L.C. The owner recognizes that a source of funding is required to support the
on-going operation and maintenance of BMPs, and that funding will continue for the life of the
project.
By certifying the final project specific WQMP, the Project applicant is certifying that the funding
responsibilities have been addressed and will be transferred to future owners. One example of
how to adhere to the requirement to transfer operation and maintenance responsibilities is to
record the project specific WQMP against the title to the property.
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix A
CONDITIONS OF APPROVAL
(TO BE PROVIDED)
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix B
VICINITY MAP, WQMP SITE PLAN, AND RECEIVING WATERS MAP
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix C
SUPPORTING DETAIL RELATED TO HYDROLOGIC CONDITIONS OF CONCERN
(NOT APPLICABLE – SEE APPENDIX F FOR HYDROLOGY REPORT SUMMARY)
MAP OF RECEIVING WATERS
0 2 4MI.
PROJECTSITE
WHITEWATER RIV ER COAC HELLA VALLEY STOR M WATER CHANNEL
58TH AVENUE
MADISON STREET60TH AVENUE
The Hotel
The Hotel
PROP. RETENTION BASIN
PROP. RETENTION BASIN
PROP. RETENTION
BASIN
PROP. RETENTION BASIN
L=780
A=62.903
DA-E
A=54.654
DA-I
A=37.990
DA-G
A=8.273
DA-H
A=44.811
DA-F
L=780
A=28.976
DA-D
L=2,000
A=41.586
DA-B
L=1,180
A=88.411
DA-A1
L=1,050
A=24.968
DA-A3
L=1,350
A=10.191
DA-C
L=1,050
A=16.741
DA-A2
PROP. LAKE &
RETENTION
EX. LEVEE
DIKE NO. 2
PROP. LAKE
& RETENTION
EX. RETENTION
BASIN
EX. RETENTION
BASIN
EX. CATCH
BASIN
EX. CATCH
BASIN
Planning Area VIII
Future Low Density Residential Development
Future Retention Capacity Expected:
Planning Area VIII
Low Density Residential
Planning Area X
Open Space
PA X
Open Space
PA IX
Surf Resort Planning Area IX
Surf Resort
Planning Area IX
Surf Resort
Planning Area VIII
Future
Low Density Residential
Planning Area IX
Surf Resort
The Farm
The Farm
Village
Pop-Up
Village 3
Pop-Up
Village 2
Pop-Up
Village 1
The
Beach Club
Planning Area IX
Surf Resort
Pop-Up
Village 4
Pop-Up
Village 5
EX. LEVEE
DIKE NO. 4
Back of
House
Coral
Mountain
4.9 acre-feet
Subject to Separate Final WQMP
Based on Final Site Design
Planning Area VIII
Future Low Density Residential Development
Future Retention Capacity Expected:
4.0 acre-feet
Subject to Separate Final WQMP
Based on Final Site Design
Planning Area VIII
Future Low Density Residential Development
Future Retention Capacity Expected:
3.4 acre-feet
Subject to Separate Final WQMP
Based on Final Site Design
Planning Area VIII
Future Neighborhood Development
Future Retention Capacity Expected:
1.4 acre-feet
Subject to Separate Final WQMP
Based on Final Site Design
PROP. WAVE
LAGOON &
RETENTION
CHECK BY
JHC
EXHIBIT DATE:
THE WAVEPROJECT NAME:
TRACT MAP NO. 37815MAP NUMBER:
PRELIMINARY WATER QUALITY MANAGEMENT PLANPLAN:
NOVEMBER 2019
MSA CONSULTING, INC.
> PLANNING > CIVIL ENGINEERING > LAND SURVEYING
34200 Bob Hope Drive, Rancho Mirage, CA 92270
760.320.9811 msaconsultinginc.com
DRAWN BY
DESIGN BY
DG
JHC
LEGEND
AC.
DA
ELEV.
PROPOSED STORM DRAIN LINES
PROPOSED DRAINAGE AREA BOUNDARIES
PROJECT BOUNDARY
PROPOSED STORM DRAIN INLETS
PROPOSED DRAINAGE DIRECTION*
L =
A =
DA DRAINAGE SUB-AREA ID
FLOW TRAVEL LENGTH (FT)
AREA (AC)
ACREAGE
DRAINAGE AREA
ELEVATION
EX.
PROP.
RET.
EXISTING
PROPOSED
RETENTION
HYDROLOGIC AREA RECONCILIATION
DRAINAGE
PRELIMINARY WQMP SUMMARY
ROCK OUT-OUTCROPPING 35.660 AC.
EXISTING OPEN BRUSH - POOR 35.233 AC.
IMPERVIOUS (STREETS/WALKS)11.726 AC.
IMPERVIOUS (WATER FEATURE)27.445 AC.
SFR - LOW DENSITY 195.535 AC.
SFR - MEDIUM DENSITY 4.092 AC.
SFR - HIGH DENSITY 22.047 AC.
OPEN SPACE (LANDSCAPE)100.009 AC.
TOTAL ON-SITE HYDROLOGIC AREA 451.555 AC.
SURVEY BOUNDARY 377.206 AC.
AREA ADD:
0.642 AC.AREA SUBTRACT:
TOTAL AREA - RECONCILED
74.991 AC.
451.555 AC.
OFF-SITE TRIBUTARY
DA-A
ROCK OUTCROPPING
IMPERVIOUS
(PAVING/HARDSCAPE)
IMPERVIOUS
(WATER FEATURE)
EXISTING OPEN BRUSH - POOR
PERVIOUS AREA
(LANDSCAPE & RETENTION BASINS)
COMMERCIAL
SINGLE FAMILY RESIDENTIAL
(WITH MS4 STENCILING OR SIGNAGE)
TRIBUTARY AREA TO BMP:
BMP DESIGN VOLUME: DRAINAGE AREA "E"
62.903 AC.
IMPERVIOUS AREA WITHIN TRIBUTARY AREA:
IMPERVIOUS AREA RATIO:
19.414 AC.
31%
RUNOFF COEFFICIENT:0.23
UNIT STORAGE VOLUME:
BMP DESIGN STORAGE VOLUME OF RETENTION BMP:
RETENTION STORAGE PROVIDED:
0.09 AC-IN
20,990 CU-FT
1,216,389 CU-FT
N.T.S.
VICINITY MAP
SITE
58TH AVENUE
60TH AVENUE
AIRPORT BLVD.
54TH AVENUE
MADISON STREETJEFFERSON STREET52ND AVENUE
MONROE STREETJACKSON STREETCITY OF
LA QUINTA
COUNTY OF
RIVERSIDE
TRIBUTARY AREA TO BMP:
BMP DESIGN VOLUME: DRAINAGE AREA "D"
28.976 AC.
IMPERVIOUS AREA WITHIN TRIBUTARY AREA:
IMPERVIOUS AREA RATIO:
14.177 AC.
49%
RUNOFF COEFFICIENT:0.33
UNIT STORAGE VOLUME:
BMP DESIGN STORAGE VOLUME OF RETENTION BMP:
RETENTION STORAGE PROVIDED:
0.13 AC-IN
13,988 CU-FT
168,719 CU-FT
TRIBUTARY AREA TO BMP:
BMP DESIGN VOLUME: DRAINAGE AREA "A"
162.171 AC.
IMPERVIOUS AREA WITHIN TRIBUTARY AREA:
IMPERVIOUS AREA RATIO:
38.874 AC.
24%
RUNOFF COEFFICIENT:0.19
UNIT STORAGE VOLUME:
BMP DESIGN STORAGE VOLUME OF RETENTION BMP:
RETENTION STORAGE PROVIDED:
0.08 AC-IN
45,337 CU-FT
3,178,217 CU-FT
TRIBUTARY AREA TO BMP:
BMP DESIGN VOLUME: DRAINAGE AREA "B"
41.586 AC.
IMPERVIOUS AREA WITHIN TRIBUTARY AREA:
IMPERVIOUS AREA RATIO:
17.512 AC.
42%
RUNOFF COEFFICIENT:0.29
UNIT STORAGE VOLUME:
BMP DESIGN STORAGE VOLUME OF RETENTION BMP:
RETENTION STORAGE PROVIDED:
0.12 AC-IN
17,613 CU-FT
292,016 CU-FT
TRIBUTARY AREA TO BMP:
BMP DESIGN VOLUME: DRAINAGE AREA "C"
10.191 AC.
IMPERVIOUS AREA WITHIN TRIBUTARY AREA:
IMPERVIOUS AREA RATIO:
4.419 AC.
43%
RUNOFF COEFFICIENT:0.30
UNIT STORAGE VOLUME:
BMP DESIGN STORAGE VOLUME OF RETENTION BMP:
RETENTION STORAGE PROVIDED:
0.12 AC-IN
4.423 CU-FT
57,966 CU-FT
AREA
TOTAL
AREA
(acres)
DA-B
DA-C
DA-D
DA-E
IMPERVIOUS
AREA
(acres)
38.874
17.512
4.419
14.177
19.414
162.171
41.586
10.191
28.976
62.903
DESIGN
VOLUME
(cu-ft)
DESIGN
FLOW
(cfs)
45,337
17,613
4,423
13,988
20,990
6.24
2.43
0.61
1.93
2.89
R:\2553\ACAD\Grading\WQMP\2553 WQMP.dwg, 11/18/2019 1:38:16 PM, dgallerani, MSA Consulting, Inc.
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix D
EDUCATIONAL MATERIALS
CHECKLIST FOR MINIMIZING VECTOR PRODUCTION IN STORMWATER MANAGEMENT STRUCTURES
OUTDOOR CLEANING ACTIVITIES AND PROFESSIONAL MOBILE SERVICE PROVIDERS
CALIFORNIA STORMWATER BMP HANDBOOK - MUNICIPAL
SC-35: Safer Alternative Products
SC-41: Building and Grounds Maintenance
SC-43: Parking/Storage Area Maintenance
SC-70: Road and Street Maintenance
SC-71: Plaza and Sidewalk Cleaning
SC-73: Landscape Maintenance
SC-74: Drainage System Maintenance
SD-12: Efficient Irrigation
SD-13: Storm Drain Signage
TC-11: Infiltration Basin
Safer Alternative Products SC-35
Description
Promote the use of less harmful products and products that
contain little or no TMDL pollutants. Alternatives exist for most
product classes including chemical fertilizers, pesticides,
cleaning solutions, janitorial chemicals, automotive and paint
products, and consumables (batteries, fluorescent lamps).
Approach
Pattern a new program after the many established programs
around the state and country. Integrate this best management
practice as much as possible with existing programs at your
facility.
Develop a comprehensive program based on:
The ³Precautionary Principle,´ which is an alternative to the
"Risk Assessment" model that says it's acceptable to use a
potentially harmful product until physical evidence of its
harmful effects are established and deemed too costly from
an environmental or public health perspective. For instance,
a risk assessment approach might say it's acceptable to use a
pesticide until there is direct proof of an environmental
impact. The Precautionary Principle approach is used to
evaluate whether a given product is safe, whether it is really
necessary, and whether alternative products would perform
just as well.
Environmentally Preferable Purchasing Program to minimize
the purchase of products containing hazardous ingredients
used in the facility's custodial services, fleet maintenance,
and facility maintenance in favor of using alternate products
that pose less risk to employees and to the environment.
Integrated Pest Management (IPM) or Less-Toxic Pesticide
Program, which uses a pest management approach that
minimizes the use of toxic chemicals and gets rid of pests by
methods that pose a lower risk to employees, the public, and
the environment.
Energy Efficiency Program including no-cost and low-cost
energy conservation and efficiency actions that can reduce
both energy consumption and electricity bills, along with
long-term energy efficiency investments.
Consider the following mechanisms for developing and
implementing a comprehensive program:
Policies
January 2003 California Stormwater BMP Handbook 1 of 5
Industrial and Commercial
www.cabmphandbooks.com
Objectives
Educate
Reduce/Minimize
Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
SC-35 Safer Alternative Products
Procedures
-Standard operating procedures (SOPs)
-Purchasing guidelines and procedures
-Bid packages (services and supplies)
Materials
-Preferred or approved product and supplier lists
-Product and supplier evaluation criteria
-Training sessions and manuals
-Fact sheets for employees
Implement this BMP in conjunction with the Vehicle and Equipment Management fact sheets
(SC ± SC) and SC41, Building and Grounds Maintenance.
Training
Employees who handle potentially harmful materials in the use of safer alternatives.
Purchasing departments should be encouraged to procure less hazardous materials and
products that contain little or no harmful substances or TMDL pollutants.
Regulations
This BMP has no regulatory requirements. Existing regulations already encourage facilities to
reduce the use of hazardous materials through incentives such as reduced:
Specialized equipment storage and handling requirements,
Storm water runoff sampling requirements,
Training and licensing requirements, and
Record keeping and reporting requirements.
Equipment
There are no major equipment requirements to this BMP.
Limitations
Alternative products may not be available, suitable, or effective in every case.
Requirements
Cost Considerations
The primary cost is for staff time to: 1) develop new policies and procedures and 2) educate
purchasing departments and employees who handle potentially harmful materials about the
availability, procurement, and use of safer alternatives.
2 of 5 California Stormwater BMP Handbook January 2003
Industrial and Commercial
www.cabmphandbooks.com
Safer Alternative Products SC-35
Some alternative products may be slightly more expensive than conventional products.
Supplemental Information
Employees and contractors / service providers can both be educated about safer alternatives by
using information developed by a number of organizations including the references and
resources listed below.
The following discussion provides some general information on safer alternatives. More specific
information on particular hazardous materials and the available alternatives may be found in
the references and resources listed below.
Automotive products ± Less toxic alternatives are not available for many automotive
products, especially engine fluids. But there are alternatives to grease lubricants, car
polishes, degreasers, and windshield washer solution. Rerefined motor oil is also available.
Vehicle/Trailer lubrication ± Fifth wheel bearings on trucks require routine lubrication.
Adhesive lubricants are available to replace typical chassis grease.
Cleaners ± Vegetables-based or citrus-based soaps are available to replace petroleum-based
soaps/detergents.
Paint products ± :ater-based paints, wood preservatives, stains, and finishes are available.
Pesticides ± Specific alternative products or methods exist to control most insects, fungi, and
weeds.
Chemical Fertilizers ± Compost and soil amendments are natural alternatives.
Consumables ± Manufacturers have either reduced or are in the process of reducing the
amount of heavy metals in consumables such as batteries and fluorescent lamps. All
fluorescent lamps contain mercury, however low-mercury containing lamps are now
available from most hardware and lighting stores. Fluorescent lamps are also more energy
efficient than the average incandescent lamp.
Janitorial chemicals ± Even biodegradable soap can harm fish and wildlife before it
biodegrades. Biodegradable does not mean non-toxic. Safer products and procedures are
available for floor stripping and cleaning, as well as carpet, glass, metal, and restroom
cleaning and disinfecting.
Examples
There are a number of business and trade associations, and communities with effective
programs. Some of the more prominent are listed below in the references and resources section.
References and Resources
Note: Many of these references provide alternative products for materials that typically are used
inside and disposed to the sanitary sewer as well as alternatives to products that usually end up
in the storm drain.
January 2003 California Stormwater BMP Handbook 3 of 5
Industrial and Commercial
www.cabmphandbooks.com
SC-35 Safer Alternative Products
General Sustainable Practices and Pollution Prevention Including Pollutant-
Specific Information
California Department of Toxic Substances Control (www.dtsc.ca.gov)
California Integrated Waste Management Board (www.ciwmb.ca.gov)
City of Santa Monica (www.santa-monica.org/environment)
City of Palo Alto (www.city.palo-alto.ca.us/cleanbay)
City and County of San Francisco, Department of the Environment
(www.ci.sf.ca.us/sfenvironment)
Earth 911 (www.earth911.org/master.asp)
Environmental Finance Center Region IX (www.greenstart.org/efc9)
Flex Your Power (www.flexyourpower.ca.gov)
GreenBiz.com (www.greenbiz.com)
Green Business Program (www.abag.org/bayarea/enviro/gbus/gb.html)
Pacific Industrial and Business Association (www.piba.org)
Sacramento Clean Water Business Partners (www.sacstormwater.org)
USEPA BMP fact sheet ± Alternative products
(http://cfpub.epa.gov/npdes/stormwater/menuofbmps/poll_2.cfm)
USEPA Region IX Pollution Prevention Program (www.epa.gov/region09/p2)
Western Regional Pollution Prevention Network (www.westp2net.org)
Metals (mercury, copper)
National Electrical Manufacturers Association - Environment, Health and Safety
(www.nema.org)
Sustainable Conservation (www.suscon.org)
Auto Recycling Project
Brake Pad Partnership
Pesticides and Chemical Fertilizers
Bio-Integral Resource Center (www.birc.org)
California Department of Pesticide Regulation (www.cdpr.ca.gov)
University of California Statewide IPM Program (www.ipm.ucdavis.edu/default.html)
4 of 5 California Stormwater BMP Handbook January 2003
Industrial and Commercial
www.cabmphandbooks.com
Safer Alternative Products SC-35
January 2003 California Stormwater BMP Handbook 5 of 5
Industrial and Commercial
www.cabmphandbooks.com
Dioxins
Bay Area Dioxins Project (http://dioxin.abag.ca.gov/)
Building & Grounds Maintenance SC-41
September 2014 California Stormwater BMP Handbook 1 of 6
Industrial and Commercial
www.casqa.org
Description
Stormwater runoff from building and grounds
maintenance activities can be contaminated
with toxic hydrocarbons in solvents, fertilizers
and pesticides, suspended solids, heavy metals,
abnormal pH, and oils and greases. Utilizing
the protocols in this fact sheet will prevent or
reduce the discharge of pollutants to
stormwater from building and grounds
maintenance activities by washing and cleaning
up with as little water as possible, following
good landscape management practices,
preventing and cleaning up spills immediately,
keeping debris from entering the storm drains,
and maintaining the stormwater collection
system.
Approach
Reduce potential for pollutant discharge
through source control pollution prevention
and BMP implementation. Successful
implementation depends on effective training
of employees on applicable BMPs and general
pollution prevention strategies and objectives.
General Pollution Prevention Protocols
Switch to non-toxic chemicals for
maintenance to the maximum extent
possible.
Choose cleaning agents that can be
recycled.
Encourage proper lawn management and
landscaping, including use of native
vegetation.
Encourage use of Integrated Pest
Management techniques for pest control.
Encourage proper onsite recycling of yard
trimmings.
Recycle residual paints, solvents, lumber,
and other material as much as possible.
Objectives
Cover
Contain
Educate
Reduce/Minimize
Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Minimum BMPs Covered
Good Housekeeping
Preventative
Maintenance
Spill and Leak
Prevention and
Response
Material Handling &
Waste Management
Erosion and Sediment
Controls
Employee Training
Program
Quality Assurance
Record Keeping
Building & Grounds Maintenance SC-41
September 2014 California Stormwater BMP Handbook 2 of 6
Industrial and Commercial
www.casqa.org
Clean work areas at the end of each work shift using dry cleaning methods such as
sweeping and vacuuming.
Good Housekeeping
Pressure Washing of Buildings, Rooftops, and Other Large Objects
In situations where soaps or detergents are used and the surrounding area is paved,
pressure washers must use a water collection device that enables collection of wash
water and associated solids. A sump pump, wet vacuum or similarly effective device
must be used to collect the runoff and loose materials. The collected runoff and solids
must be disposed of properly.
If soaps or detergents are not used, and the surrounding area is paved, wash runoff
does not have to be collected but must be screened. Pressure washers must use filter
fabric or some other type of screen on the ground and/or in the catch basin to trap
the particles in wash water runoff.
If you are pressure washing on a grassed area (with or without soap), runoff must be
dispersed as sheet flow as much as possible, rather than as a concentrated stream.
The wash runoff must remain on the grass and not drain to pavement.
Landscaping Activities
Dispose of grass clippings, leaves, sticks, or other collected vegetation as garbage, or
by composting. Do not dispose of collected vegetation into waterways or storm
drainage systems.
Use mulch or other erosion control measures on exposed soils. See also SC-40,
Contaminated and Erodible Areas, for more information.
Building Repair, Remodeling, and Construction
Do not dump any toxic substance or liquid waste on the pavement, the ground, or
toward a storm drain.
Use ground or drop cloths underneath outdoor painting, scraping, and sandblasting
work, and properly dispose of collected material daily.
Use a ground cloth or oversized tub for activities such as paint mixing and tool
cleaning.
Clean paintbrushes and tools covered with water-based paints in sinks connected to
sanitary sewers or in portable containers that can be dumped into a sanitary sewer
drain. Brushes and tools covered with non-water-based paints, finishes, or other
materials must be cleaned in a manner that enables collection of used solvents (e.g.,
paint thinner, turpentine, etc.) for recycling or proper disposal.
Use a storm drain cover, filter fabric, or similarly effective runoff control mechanism
if dust, grit, wash water, or other pollutants may escape the work area and enter a
catch basin. This is particularly necessary on rainy days. The containment device(s)
must be in place at the beginning of the work day, and accumulated dirty runoff and
Building & Grounds Maintenance SC-41
September 2014 California Stormwater BMP Handbook 3 of 6
Industrial and Commercial
www.casqa.org
solids must be collected and disposed of before removing the containment device(s)
at the end of the work day.
If you need to de-water an excavation site, you may need to filter the water before
discharging to a catch basin or off-site. If directed off-site, you should direct the
water through hay bales and filter fabric or use other sediment filters or traps.
Store toxic material under cover during precipitation events and when not in use. A
cover would include tarps or other temporary cover material.
Mowing, Trimming, and Planting
Dispose of leaves, sticks, or other collected vegetation as garbage, by composting or
at a permitted landfill. Do not dispose of collected vegetation into waterways or
storm drainage systems.
Use mulch or other erosion control measures when soils are exposed.
Place temporarily stockpiled material away from watercourses and drain inlets, and
berm or cover stockpiles to prevent material releases to the storm drain system.
Consider an alternative approach when bailing out muddy water: do not put it in the
storm drain; pour over landscaped areas.
Use hand weeding where practical.
Fertilizer and Pesticide Management
Do not use pesticides if rain is expected.
Do not mix or prepare pesticides for application near storm drains.
Use the minimum amount needed for the job.
Calibrate fertilizer distributors to avoid excessive application.
Employ techniques to minimize off-target application (e.g., spray drift) of pesticides,
including consideration of alternative application techniques.
Apply pesticides only when wind speeds are low.
Fertilizers should be worked into the soil rather than dumped or broadcast onto the
surface.
Irrigate slowly to prevent runoff and then only as much as is needed.
Clean pavement and sidewalk if fertilizer is spilled on these surfaces before applying
irrigation water.
Inspection
Inspect irrigation system periodically to ensure that the right amount of water is
being applied and that excessive runoff is not occurring. Minimize excess watering
and repair leaks in the irrigation system as soon as they are observed.
Building & Grounds Maintenance SC-41
September 2014 California Stormwater BMP Handbook 4 of 6
Industrial and Commercial
www.casqa.org
Spill Response and Prevention Procedures
Keep your Spill Prevention Control and Countermeasure (SPCC) Plan up-to-date.
Place a stockpile of spill cleanup materials, such as brooms, dustpans, and vacuum
sweepers (if desired) near the storage area where it will be readily accessible.
Have employees trained in spill containment and cleanup present during the
loading/unloading of dangerous wastes, liquid chemicals, or other materials.
Familiarize employees with the Spill Prevention Control and Countermeasure Plan.
Clean up spills immediately.
Material Handling and Waste Management
Follow all federal, state, and local laws and regulations governing the use, storage,
and disposal of fertilizers and pesticides and training of applicators and pest control
advisors.
Use less toxic pesticides that will do the job when applicable. Avoid use of copper-
based pesticides if possible.
Dispose of empty pesticide containers according to the instructions on the container
label.
Use up the pesticides. Rinse containers, and use rinse water as product. Dispose of
unused pesticide as hazardous waste.
Implement storage requirements for pesticide products with guidance from the local
fire department and County Agricultural Commissioner. Provide secondary
containment for pesticides.
Employee Training Program
Educate and train employees on pesticide use and in pesticide application techniques
to prevent pollution.
Train employees and contractors in proper techniques for spill containment and
cleanup.
Be sure the frequency of training takes into account the complexity of the operations
and the needs of individual staff.
Quality Assurance and Record Keeping
Keep accurate logs that document maintenance activities performed and minimum
BMP measures implemented.
Keep accurate logs of spill response actions that document what was spilled, how it
was cleaned up, and how the waste was disposed.
Establish procedures to complete logs and file them in the central office.
Building & Grounds Maintenance SC-41
September 2014 California Stormwater BMP Handbook 5 of 6
Industrial and Commercial
www.casqa.org
Potential Capital Facility Costs and Operation & Maintenance
Requirements
Facilities
Additional capital costs are not anticipated for building and grounds maintenance.
Implementation of the minimum BMPs described above should be conducted as part
of regular site operations.
Maintenance
Maintenance activities for the BMPs described above will be minimal, and no
additional cost is anticipated.
Supplemental Information
Fire Sprinkler Line Flushing
Site fire sprinkler line flushing may be a source of non-stormwater runoff pollution. The
water entering the system is usually potable water, though in some areas it may be non-
potable reclaimed wastewater. There are subsequent factors that may drastically reduce
the quality of the water in such systems. Black iron pipe is usually used since it is
cheaper than potable piping, but it is subject to rusting and results in lower quality
water. Initially, the black iron pipe has an oil coating to protect it from rusting between
manufacture and installation; this will contaminate the water from the first flush but not
from subsequent flushes. Nitrates, poly-phosphates and other corrosion inhibitors, as
well as fire suppressants and antifreeze may be added to the sprinkler water system.
Water generally remains in the sprinkler system a long time (typically a year) and
between flushes may accumulate iron, manganese, lead, copper, nickel, and zinc. The
water generally becomes anoxic and contains living and dead bacteria and breakdown
products from chlorination. This may result in a significant BOD problem and the water
often smells. Consequently dispose fire sprinkler line flush water into the sanitary sewer.
Do not allow discharge to storm drain or infiltration due to potential high levels of
pollutants in fire sprinkler line water.
References and Resources
City of Seattle, Seattle Public Utilities Department of Planning and Development, 2009.
Stormwater Manual Vol. 1 Source Control Technical Requirements Manual.
Kennedy/Jenks Consultants, 2007.The Truckee Meadows Industrial and Commercial
Storm Water Best Management Practices Handbook. Available online at:
http://www.cityofsparks.us/sites/default/files/assets/documents/env-
control/construction/TM-I-C_BMP_Handbook_2-07-final.pdf.
Orange County Stormwater Program, Best Management Practices for
Industrial/Commercial Business Activities. Available online at:
http://ocwatersheds.com/documents/bmp/industrialcommercialbusinessesactivities.
Sacramento Stormwater Management Program.Best Management Practices for
Industrial Storm Water Pollution Control . Available online at:
Building & Grounds Maintenance SC-41
September 2014 California Stormwater BMP Handbook 6 of 6
Industrial and Commercial
www.casqa.org
http://www.msa.saccounty.net/sactostormwater/documents/guides/industrial-BMP-
manual.pdf.
US EPA, 1997.Best Management Practices Handbook for Hazardous Waste
Containers. Available online at: http://www.epa.gov/region6/6en/h/handbk4.pdf.
Ventura Countywide Stormwater Management Program Clean Business Fact Sheets.
Available online at:
http://www.vcstormwater.org/documents/programs_business/building.pdf.
Parking/Storage Area Maintenance SC-43
January 2003 California Stormwater BMP Handbook 1 of 4
Municipal
www.cabmphandbooks.com
Description
Parking lots and storage areas can contribute a number of
substances, such as trash, suspended solids, hydrocarbons, oil
and grease, and heavy metals that can enter receiving waters
through stormwater runoff or non-stormwater discharges. The
following protocols are intended to prevent or reduce the
discharge of pollutants from parking/storage areas and include
using good housekeeping practices, following appropriate
cleaning BMPs, and training employees.
Approach
Pollution Prevention
Encourage alternative designs and maintenance strategies for
impervious parking lots. (See New Development and
Redevelopment BMP Handbook).
Keep accurate maintenance logs to evaluate BMP
implementation.
Suggested Protocols
General
Keep the parking and storage areas clean and orderly.
Remove debris in a timely fashion.
Allow sheet runoff to flow into biofilters (vegetated strip and
swale) and/or infiltration devices.
Utilize sand filters or oleophilic collectors for oily waste in low
concentrations.
Objectives
Cover
Contain
Educate
Reduce/Minimize
Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
SC-43 Parking/Storage Area Maintenance
2 of 4 California Stormwater BMP Handbook January 2003
Municipal
www.cabmphandbooks.com
Arrange rooftop drains to prevent drainage directly onto paved surfaces.
Design lot to include semi-permeable hardscape.
Controlling Litter
Post No Littering signs and enforce anti-litter laws.
Provide an adequate number of litter receptacles.
Clean out and cover litter receptacles frequently to prevent spillage.
Provide trash receptacles in parking lots to discourage litter.
Routinely sweep, shovel and dispose of litter in the trash.
Surface cleaning
Use dry cleaning methods (e.g. sweeping or vacuuming) to prevent the discharge of
pollutants into the stormwater conveyance system.
Establish frequency of public parking lot sweeping based on usage and field observations of
waste accumulation.
Sweep all parking lots at least once before the onset of the wet season.
If water is used follow the procedures below:
-Block the storm drain or contain runoff.
-Wash water should be collected and pumped to the sanitary sewer or discharged to a
pervious surface, do not allow wash water to enter storm drains.
-Dispose of parking lot sweeping debris and dirt at a landfill.
When cleaning heavy oily deposits:
-Use absorbent materials on oily spots prior to sweeping or washing.
-Dispose of used absorbents appropriately.
Surface Repair
Pre-heat, transfer or load hot bituminous material away from storm drain inlets.
Apply concrete, asphalt, and seal coat during dry weather to prevent contamination form
contacting stormwater runoff.
Cover and seal nearby storm drain inlets (with waterproof material or mesh) and manholes
before applying seal coat, slurry seal, etc., where applicable. Leave covers in place until job
is complete and until all water from emulsified oil sealants has drained or evaporated. Clean
any debris from these covered manholes and drains for proper disposal.
Parking/Storage Area Maintenance SC-43
January 2003 California Stormwater BMP Handbook 3 of 4
Municipal
www.cabmphandbooks.com
Use only as much water as necessary for dust control, to avoid runoff.
Catch drips from paving equipment that is not in use with pans or absorbent material placed
under the machines. Dispose of collected material and absorbents properly.
Inspection
Have designated personnel conduct inspections of the parking facilities and stormwater
conveyance systems associated with them on a regular basis.
Inspect cleaning equipment/sweepers for leaks on a regular basis.
Training
Provide regular training to field employees and/or contractors regarding cleaning of paved
areas and proper operation of equipment.
Train employees and contractors in proper techniques for spill containment and cleanup.
Spill Response and Prevention
Refer to SC-11, Spill Prevention, Control & Cleanup.
Keep your Spill Prevention Control and countermeasure (SPCC) plan up-to-date, nad
implement accordingly.
Have spill cleanup materials readily available and in a known location.
Cleanup spills immediately and use dry methods if possible.
Properly dispose of spill cleanup material.
Other Considerations
Limitations related to sweeping activities at large parking facilities may include high
equipment costs, the need for sweeper operator training, and the inability of current sweeper
technology to remove oil and grease.
Requirements
Costs
Cleaning/sweeping costs can be quite large, construction and maintenance of stormwater
structural controls can be quite expensive as well.
Maintenance
Sweep parking lot to minimize cleaning with water.
Clean out oil/water/sand separators regularly, especially after heavy storms.
Clean parking facilities on a regular basis to prevent accumulated wastes and pollutants
from being discharged into conveyance systems during rainy conditions.
SC-43 Parking/Storage Area Maintenance
4 of 4 California Stormwater BMP Handbook January 2003
Municipal
www.cabmphandbooks.com
Supplemental Information
Further Detail of the BMP
Surface Repair
Apply concrete, asphalt, and seal coat during dry weather to prevent contamination form
contacting stormwater runoff. Where applicable, cover and seal nearby storm drain inlets (with
waterproof material or mesh) and manholes before applying seal coat, slurry seal, etc. Leave
covers in place until job is complete and until all water from emulsified oil sealants has drained
or evaporated. Clean any debris from these covered manholes and drains for proper disposal.
Use only as much water as necessary for dust control, to avoid runoff.
References and Resources
http://www.stormwatercenter.net/
Californias Nonpoint Source Program Plan http://www.swrcb.ca.gov/nps/index.html
Model Urban Runoff Program: A How-To Guide for Developing Urban Runoff Programs for
Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal
Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area
Governments, Woodward-Clyde, Central Coast Regional Water Quality control Board. July
1998 (Revised February 2002 by the California Coastal Commission).
Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp_introduction.asp
Oregon Association of Clean Water Agencies. Oregon Municipal Stormwater Toolbox for
Maintenance Practices. June 1998.
Pollution from Surface Cleaning Folder. 1996. Bay Area Stormwater Management Agencies
Association (BASMAA) http://www.basma.org
San Diego Stormwater Co-permittees Jurisdictional Urban Runoff Management Program
(URMP)
http://www.projectcleanwater.org/pdf/Model%20Program%20Municipal%20Facilities.pdf
Infiltration Basin TC-11
January 2003 California Stormwater BMP Handbook 1 of 3
Municipal
www.cabmphandbooks.com
General Description
An infiltration basin is a shallow impoundment that is designed
to infiltrate stormwater. Infiltration basins use the natural
filtering ability of the soil to remove pollutants in stormwater
runoff. Infiltration facilities store runoff until it gradually
infiltrates into the soil and eventually into the water table. This
practice has high pollutant removal efficiency and can also help
recharge groundwater, thus helping to maintain low flows in
stream systems. Infiltration basins can be challenging to apply
on many sites, however, because of soils requirements. In
addition, some studies have shown relatively high failure rates
compared with other management practices.
Inspection/Maintenance Considerations
Infiltration basins perform better in well-drained permeable soils.
Infiltration basins in areas of low permeability can clog within a
couple years, and require more frequent inspections and
maintenance. The use and regular maintenance of pretreatment
BMPs will significantly minimize maintenance requirements for the
basin. Spill response procedures and controls should be
implemented to prevent spills from reaching the infiltration system.
Scarification or other disturbance should only be performed
when there are actual signs of clogging or significant loss of
infiltrative capacity, rather than on a routine basis. Always
remove deposited sediments before scarification, and use a
hand-guided rotary tiller, if possible, or a disc harrow pulled by a
light tractor. This BMP may require groundwater monitoring.
Basins cannot be put into operation until the upstream tributary area is
stabilized.
Maintenance Concerns,
Objectives, and Goals
Vector Control
Clogged soil or outlet structures
Vegetation/Landscape
Maintenance
Groundwater contamination
Accumulation of metals
Aesthetics
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
Legend (Removal Effectiveness)
Low High
Medium
TC-11 Infiltration Basin
2 of 3 California Stormwater BMP Handbook January 2003
Municipal
www.cabmphandbooks.com
Clogged infiltration basins with surface standing water can become a breeding area for
mosquitoes and midges. Maintenance efforts associated with infiltration basins should include
frequent inspections to ensure that water infiltrates into the subsurface completely
(recommended infiltration rate of 72 hours or less) and that vegetation is carefully managed to
prevent creating mosquito and other vector habitats.
Inspection Activities Suggested
Frequency
Observe drain time for a storm after completion or modification of the facility to confirm
that the desired drain time has been obtained.
Newly established vegetation should be inspected several times to determine if any
landscape maintenance (reseeding, irrigation, etc.) is necessary.
Post construction
Inspect for the following issues: differential accumulation of sediment, signs of wetness
or damage to structures, erosion of the basin floor, dead or dying grass on the bottom,
condition of riprap, drain time, signs of petroleum hydrocarbon contamination, standing
water, trash and debris, sediment accumulation, slope stability, pretreatment device
condition
Semi-annual and
after extreme
events
Maintenance Activities Suggested
Frequency
Factors responsible for clogging should be repaired immediately.
Weed once monthly during the first two growing seasons.
Post construction
Stabilize eroded banks.
Repair undercut and eroded areas at inflow and outflow structures.
Maintain access to the basin for regular maintenance activities.
Mow as appropriate for vegetative cover species.
Monitor health of vegetation and replace as necessary.
Control mosquitoes as necessary.
Remove litter and debris from infiltration basin area as required.
Standard
maintenance (as
needed)
Mow and remove grass clippings, litter, and debris.
Trim vegetation at the beginning and end of the wet season to prevent establishment of
woody vegetation and for aesthetic and vector reasons.
Replant eroded or barren spots to prevent erosion and accumulation of sediment.
Semi-annual
Scrape bottom and remove sediment when accumulated sediment reduces original
infiltration rate by 25-50%. Restore original cross-section and infiltration rate. Properly
dispose of sediment.
Seed or sod to restore ground cover.
Disc or otherwise aerate bottom.
Dethatch basin bottom.
3-5 year
maintenance
Infiltration Basin TC-11
January 2003 California Stormwater BMP Handbook 3 of 3
Municipal
www.cabmphandbooks.com
Additional Information
In most cases, sediment from an infiltration basin does not contain toxins at levels posing a
hazardous concern. Studies to date indicate that pond sediments are generally below toxicity
limits and can be safely landfilled or disposed onsite. Onsite sediment disposal is always
preferable (if local authorities permit) as long as the sediments are deposited away from the
shoreline to prevent their reentry into the pond and away from recreation areas, where they
could possibly be ingested by young children. Sediments should be tested for toxicants in
compliance with current disposal requirements if land uses in the catchment include
commercial or industrial zones, or if visual or olfactory indications of pollution are noticed.
Sediments containing high levels of pollutants should be disposed of properly.
Light equipment, which will not compact the underlying soil, should be used to remove the top
layer of sediment. The remaining soil should be tilled and revegetated as soon as possible.
Sediment removal within the basin should be performed when the sediment is dry enough so
that it is cracked and readily separates from the basin floor. This also prevents smearing of the
basin floor.
References
King County, Stormwater Pollution Control Manual Best Management Practices for
Businesses. July, 1995 Available at: ftp://dnr metrokc.gov/wlr/dss/spcm/SPCM.HTM
Metropolitan Council, Urban Small Sites Best Management Practices Manual. Available at:
http://www.metrocouncil.org/environment/Watershed/BMP/manual.htm
U.S. Environmental Protection Agency, Post-Construction Stormwater Management in New
Development & Redevelopment BMP Factsheets. Available at:
http://www.cfpub.epa.gov/npdes/stormwater/menuofbmps/bmp_files.cfm
Ventura Countywide Stormwater Quality Management Program, Technical Guidance Manual
for Stormwater Quality Control Measures. July, 2002.
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix E
SOILS REPORT
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix F
STRUCTURAL BMP AND/OR RETENTION FACILITY SIZING CALCULATIONS
AND DESIGN DETAILS
SUMMARY OF PRELIMINARY HYDROLOGY REPORT FOR THE WAVE AT CORAL MOUNTAIN
(TTM 37815)
ATRIB = 162.171 acres
Determine the Impervious Area Within ATRIB (AIMP)AIMP = 38.874 acres
Calculate the Impervious Area Ratio (IF)
IF = AIMP/ATRIB IF = 0.24
Use the following equation based on the WEF/ASCE Method
CBMP = 0.858If
3 - 0.78If
2 + 0.774If + 0.04 CBMP = 0.19
Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.08 (in*ac)/ac
Calculate the design storage volume of the BMP, VBMP
VBMP (ft3) =VBMP = 45,337 ft3
QBMP = CBMP x I x ATRIB QBMP = 6.24 ft3/s
I = Design Rainfall Intensity, 0.2 in/hr
Notes:
BMP Design Flow Rate, QBMP
Company Name
Designed By
Company Project Number/Name
Drainage Area Number/Name
THE WAVE - MSA JOB #2553
DRAINAGE AREA ’A’
October 21, 2019
VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac)
12(in/ft)
Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area
Determine Design Storage Volume, VBMP
Legend:
Required Entries
Calculated Cells
Determine the Impervious Area Ratio
WhitewaterWatershed
BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014)
Enter the Area Tributary to this Feature (ATRIB)
MSA Consulting, Inc
DLS
Date
County/City Case No.
PROECT
JOB No.
BASIN DESIGNATION:
BASIN CHARACTERISTICS
CONTOUR
ELEVATION INCR TOTAL INCR TOTAL INCR
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
451 0 0 548,486 0 0 0.00
456 5 5 178,499 726,985 3,178,217 3,178,217 72.96
WHERE:
TOTAL
WAVE LAGOON
BASIN VOLUME WORKSHEET
DEPTH AREA VOLUME
THE WAVE
2553
( )( )2121213
1 AAAAEEV++-=
Basin Volume Worksheet
Page 13 of 13
PROECT
JOB No.
BASIN DESIGNATION:
BASIN CHARACTERISTICS
CONTOUR
ELEVATION INCR TOTAL INCR TOTAL INCR
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
459 0 0 65,765 0 0 0.00
460 1 1 11,545 77,310 71,460 71,460 1.64
461 1 2 12,170 89,480 83,321 154,781 3.55
WHERE:
TOTAL
10 YEAR BASIN
BASIN VOLUME WORKSHEET
DEPTH AREA VOLUME
THE WAVE
2553
( )( )2121213
1 AAAAEEV++-=
Basin Volume Worksheet
Page 13 of 13
PROECT
JOB No.
BASIN DESIGNATION:
BASIN CHARACTERISTICS
CONTOUR
ELEVATION INCR TOTAL INCR TOTAL INCR
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
468 0 0 10,730 0 0 0.00
469 1 1 6,330 17,060 13,773 13,773 0.32
470 1 2 6,965 24,025 20,443 34,217 0.79
WHERE:
TOTAL
10 YEAR BASIN
BASIN VOLUME WORKSHEET
DEPTH AREA VOLUME
THE WAVE
2553
( )( )2121213
1 AAAAEEV++-=
Basin Volume Worksheet
Page 13 of 13
ATRIB = 41.586 acres
Determine the Impervious Area Within ATRIB (AIMP)AIMP = 17.512 acres
Calculate the Impervious Area Ratio (IF)
IF = AIMP/ATRIB IF = 0.42
Use the following equation based on the WEF/ASCE Method
CBMP = 0.858If
3 - 0.78If
2 + 0.774If + 0.04 CBMP = 0.29
Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.12 (in*ac)/ac
Calculate the design storage volume of the BMP, VBMP
VBMP (ft3) =VBMP = 17,613 ft3
QBMP = CBMP x I x ATRIB QBMP = 2.43 ft3/s
I = Design Rainfall Intensity, 0.2 in/hr
Legend:
Required Entries
Calculated Cells
Determine the Impervious Area Ratio
WhitewaterWatershed
BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014)
Enter the Area Tributary to this Feature (ATRIB)
MSA Consulting, Inc
DLS
Date
County/City Case No.
Notes:
BMP Design Flow Rate, QBMP
Company Name
Designed By
Company Project Number/Name
Drainage Area Number/Name
THE WAVE - MSA JOB #2553
DRAINAGE AREA ’B’
October 21, 2019
VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac)
12(in/ft)
Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area
Determine Design Storage Volume, VBMP
PROECT
JOB No.
BASIN DESIGNATION:
BASIN CHARACTERISTICS
CONTOUR
ELEVATION INCR TOTAL INCR TOTAL INCR
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
458 0 0 279,800 0 0 0.00
459 1 1 24,605 304,405 292,016 292,016 6.70
WHERE:
TOTAL
BASIN B
BASIN VOLUME WORKSHEET
DEPTH AREA VOLUME
THE WAVE
2553
( )( )2121213
1 AAAAEEV++-=
Basin Volume Worksheet
Page 13 of 13
ATRIB = 10.191 acres
Determine the Impervious Area Within ATRIB (AIMP)AIMP = 4.419 acres
Calculate the Impervious Area Ratio (IF)
IF = AIMP/ATRIB IF = 0.43
Use the following equation based on the WEF/ASCE Method
CBMP = 0.858If
3 - 0.78If
2 + 0.774If + 0.04 CBMP = 0.30
Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.12 (in*ac)/ac
Calculate the design storage volume of the BMP, VBMP
VBMP (ft3) =VBMP = 4,423 ft3
QBMP = CBMP x I x ATRIB QBMP = 0.61 ft3/s
I = Design Rainfall Intensity, 0.2 in/hr
Notes:
BMP Design Flow Rate, QBMP
Company Name
Designed By
Company Project Number/Name
Drainage Area Number/Name
THE WAVE - MSA JOB #2553
DRAINAGE AREA ’C’
October 21, 2019
VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac)
12(in/ft)
Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area
Determine Design Storage Volume, VBMP
Legend:
Required Entries
Calculated Cells
Determine the Impervious Area Ratio
WhitewaterWatershed
BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014)
Enter the Area Tributary to this Feature (ATRIB)
MSA Consulting, Inc
DLS
Date
County/City Case No.
PROECT
JOB No.
BASIN DESIGNATION:
BASIN CHARACTERISTICS
CONTOUR
ELEVATION INCR TOTAL INCR TOTAL INCR
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
452 0 0 25,035 0 0 0.00
453 1 1 3,930 28,965 26,976 26,976 0.62
454 1 2 4,095 33,060 30,990 57,966 1.33
WHERE:
TOTAL
BASIN C
BASIN VOLUME WORKSHEET
DEPTH AREA VOLUME
THE WAVE
2553
( )( )2121213
1 AAAAEEV++-=
Basin Volume Worksheet
Page 13 of 13
ATRIB = 28.976 acres
Determine the Impervious Area Within ATRIB (AIMP)AIMP = 14.177 acres
Calculate the Impervious Area Ratio (IF)
IF = AIMP/ATRIB IF = 0.49
Use the following equation based on the WEF/ASCE Method
CBMP = 0.858If
3 - 0.78If
2 + 0.774If + 0.04 CBMP = 0.33
Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.13 (in*ac)/ac
Calculate the design storage volume of the BMP, VBMP
VBMP (ft3) =VBMP = 13,988 ft3
QBMP = CBMP x I x ATRIB QBMP = 1.93 ft3/s
I = Design Rainfall Intensity, 0.2 in/hr
Notes:
BMP Design Flow Rate, QBMP
Company Name
Designed By
Company Project Number/Name
Drainage Area Number/Name
THE WAVE - MSA JOB #2553
DRAINAGE AREA ’D’
October 21, 2019
VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac)
12(in/ft)
Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area
Determine Design Storage Volume, VBMP
Legend:
Required Entries
Calculated Cells
Determine the Impervious Area Ratio
WhitewaterWatershed
BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014)
Enter the Area Tributary to this Feature (ATRIB)
MSA Consulting, Inc
DLS
Date
County/City Case No.
PROECT
JOB No.
BASIN DESIGNATION:
BASIN CHARACTERISTICS
CONTOUR
ELEVATION INCR TOTAL INCR TOTAL INCR
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
451 0 0 101,190 0 0 0.00
452 1 1 11,305 112,495 106,793 106,793 2.45
452.5 0.5 1.5 23,075 135,570 61,927 168,719 3.87
WHERE:
TOTAL
BASIN D
BASIN VOLUME WORKSHEET
DEPTH AREA VOLUME
THE WAVE
2553
( )( )2121213
1 AAAAEEV++-=
Basin Volume Worksheet
Page 13 of 13
ATRIB = 62.903 acres
Determine the Impervious Area Within ATRIB (AIMP)AIMP = 19.414 acres
Calculate the Impervious Area Ratio (IF)
IF = AIMP/ATRIB IF = 0.31
Use the following equation based on the WEF/ASCE Method
CBMP = 0.858If
3 - 0.78If
2 + 0.774If + 0.04 CBMP = 0.23
Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.09 (in*ac)/ac
Calculate the design storage volume of the BMP, VBMP
VBMP (ft3) =VBMP = 20,990 ft3
QBMP = CBMP x I x ATRIB QBMP = 2.89 ft3/s
I = Design Rainfall Intensity, 0.2 in/hr
Legend:
Required Entries
Calculated Cells
Determine the Impervious Area Ratio
WhitewaterWatershed
BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014)
Enter the Area Tributary to this Feature (ATRIB)
MSA Consulting, Inc
DLS
Date
County/City Case No.
Notes:
BMP Design Flow Rate, QBMP
Company Name
Designed By
Company Project Number/Name
Drainage Area Number/Name
THE WAVE - MSA JOB #2553
DRAINAGE AREA ’E’
October 21, 2019
VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac)
12(in/ft)
Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area
Determine Design Storage Volume, VBMP
PROECT
JOB No.
BASIN DESIGNATION:
BASIN CHARACTERISTICS
CONTOUR
ELEVATION INCR TOTAL INCR TOTAL INCR
(ft) (ft) (sf) (sf) (cuft) (cuft) (acre-ft)
442 0 0 224,555 0 0 0.00
443 1 1 7,425 231,980 228,257 228,257 5.24
444 1 2 7,480 239,460 235,710 463,968 10.65
445 1 3 7,540 247,000 243,220 707,188 16.23
446 1 4 7,595 254,595 250,788 957,976 21.99
447 1 5 7,655 262,250 258,413 1,216,389 27.92
WHERE:
TOTAL
BASIN E
BASIN VOLUME WORKSHEET
DEPTH AREA VOLUME
THE WAVE
2553
( )( )2121213
1 AAAAEEV++-=
Basin Volume Worksheet
Page 13 of 13
The Wave at Coral Mountain
Preliminary Hydrology Report
1
PROJECT DESCRIPTION & LOCATION
The project is proposed to consist of residential structures, a multi-story hotel complex, a wave lagoon and
various outdoor amenities. The project site comprises approximately 377 acres with an additional 75 acres of
offsite tributary area. The subject property is located on the southwest corner of Avenue 58 and Madison
Street in the City of La Quinta and is situated in a portion of Sections 27 & 28, Township 6 South, Range 7 East,
SBM. Existing dikes 2 & 4 along with the Coral Mountains border the property to the west and south. A
vicinity map obtained from the Riverside TLMA website is included as Appendix A.
EXISTING SITE CONDITIONS
Flood Rate Map
The proposed area is covered by FIRM Panel Number 06065C2900G, effective date of August 28, 2008, which
indicates the subject property lies within Zone X (Shaded), defined as “Areas of 0.2% annual chance flood;
areas of 1% annual chance flood with average depths of less than 1 foot or with drainage areas less than 1
square mile; and areas protected by levees from 1% annual chance flood. Insurance purchase is not required in
these areas.” Refer to the attached NFIP Flood Insurance Rate Map in Appendix B.
Existing Topography
The property is generally vacant and undeveloped with CVWD irrigation mains, numerous dirt road and hiking
trails. Various desert vegetation is found throughout the site.
The site is bounded to the east by Madison Street, to the north by 58th Avenue, existing levees and the Coral
Mountains to the west and south, and 60th Avenue to the south. No groundwater was encountered in any of
the exploratory borings to a depth of 51 feet. Site drainage appears to be controlled via sheet flow and
surface infiltration generally from west to east.
PROPOSED FLOOD CONTROL REQUIREMENTS
The purpose of this report is to provide preliminary basin analyses for the subject property. The drainage
requirements for this project fall under the jurisdiction of the City of La Quinta. Storm flows are conveyed
through the site via street flow to localized low points.
Existing improvements along Madison Street have in essence created a situation where there is no emergency
out-flow for storm flows exceeding the 100-year storm event. Conversations are on-going with the owners of
Andalusia (to the east of the subject property) to allow for an emergency overflow route to be constructed
through the development. That being said, the existing retention basins at the low points on Madison Street
will need to be preserved.
HYDROLOGY ANALYSIS DESIGN CRITERIA
Storm runoff volumes for the 100-year event were obtained utilizing the Synthetic Unit Hydrograph as
described in the RCFC&WCD Hydrology Manual. The hydrologic data used for the calculations are as follows:
Hydrologic Soil Group
The existing soil is categorized primarily as hydrologic soil groups “A” and “B” for the majority of the subject
property with soil group “D” being assigned to the Coral Mountain rock out-cropping as shown per the
attached National Cooperative Soil Survey exhibits in Appendix C. For the purposes of this report, Soil Group
‘B’ was assigned to the analyses with the exception of the rock out-cropping.
Soil Group ‘B’ is defined by RCFCD as – “soils having moderate infiltration rates when thoroughly wetted and
consisting chiefly of moderately deep to deep, moderately well to well drained soils with moderately fine to
moderately coarse textures. These soils have a moderate rate of water transmission”.
The Wave at Coral Mountain
Preliminary Hydrology Report
2
Soil Group ‘D’ is defined by RCFCD as – “soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high-
water table, soils that have a claypan or clay layer at or near the surface and soils that are shallow over nearly
impervious material”.
Antecedent Moisture Condition
AMC II – Moderate runoff potential, an intermediate condition. Per RCFC & WCD Hydrology Manual (Dated:
April 1978): “For the purposes of design hydrology using District methods, AMC II should normally be assumed
for both the 10 year and 100 year frequency storm”.
Land Use Classifications and Runoff Index Numbers
Runoff Index Numbers were obtained from RCFCD Plates E6.1, E6.2 and E6.3 are summarized below:
Commercial or Residential Landscaping (Soil Group B) 56
Rock Out-cropping (Soil Group D) 93
Existing Open Brush – Poor 76
Percent of Impervious Cover (RCFCD Plate E-6.3):
Rock Out-cropping 5%
Existing Open Brush – Poor Condition 5%
Impervious Areas (Buildings, Pavement, Hardscape) 100%
Water Features 100%
Commercial Areas 90%
SFR – Low Density 30%
SFR – Medium Density 40%
SFR – High Density 50%
Open Space (Landscaping & Retention Basins) 10%
Low Loss Rates: 85%
Precipitation Frequency Estimates
Precipitation depths were obtained from NOAA Atlas 14:
2 Year - 1 Hour Precipitation: 0.358 inches
10 Year – 1 Hour Precipitation: 0.711 inches
10 Year –3 Hour Precipitation: 1.06 inches
10 Year – 6 Hour Precipitation: 1.36 inches
10 Year – 24 Hour Precipitation: 2.23 inches
100 Year – 1 Hour Precipitation: 1.44 inches
100 Year – 3 Hour Precipitation: 2.14 inches
100 Year - 6 Hour Precipitation 2.76 inches
100 Year – 24 Hour Precipitation 4.41 inches
Slope of Intensity Duration Curve: 0.52
See Appendix D for the NOAA Atlas 14 Point Precipitation Frequency Estimates and respective RCFCD Plates.
Site Infiltration
No percolation tests have been performed at the current time, therefore, for the purposes of this report a
design percolation rate of 1 in/hr was used in the basin sizing calculations.
The Wave at Coral Mountain
Preliminary Hydrology Report
3
Proposed Land Use Summaries
Land uses for each of the drainage areas were analyzed based on the preliminary site plan. In addition, a
reconciliation was performed to verify the hydrologic boundary corresponds to the existing property boundary
accounting for any differences. Land use worksheets are included in Appendix E.
SUMMARY of SYNTHETIC UNIT (SHORTCUT METHOD) ANALYSES
The proposed retention basins for the associated drainage areas were sized to retain the 100-year controlling
storm event flood volumes and were analyzed utilizing the RCFCD Synthetic Unit (Shortcut Method). Per the
manual, for areas of less than 100 – 200 acres, and lag times less than 7 – 8 minutes, the shortcut method is
applicable. This method assumes that in a small watershed, response time to effective rainfall is very short.
Therefore, runoff rates for a given period of time can be assumed to be directly proportional to effective rain.
This method yields only approximate results (on the conservative side) and should be used only for
watersheds meeting the criteria noted above.
It should be noted that the peak flow for the 1-hour storm is not necessarily representative for peak flow. Per
RCFCD, peak discharges from the 3-hour storm should normally compare well with rational peaks.
The synthetic unit worksheets are included in Appendix F and are summarized on sheets 1 and 2 of the
hydrology exhibits in Appendix H.
Drainage Area ‘A’
This area is located on the westerly portion of the project and consists primarily of Dike Number 2, the Coral
Mountains, a portion of Dike Number 4, the south-westerly portion of Planning Area IX and Planning Area X.
Storm runoff (approximately 18.4 acre-feet) from this drainage sub-area is directed to the wave lagoon which
provides over 73 acre-feet of retention. Shallow basins are proposed to retain 10-year storm flows from
drainage areas ‘A1’ & ‘A3’. During the final design process, once a more detailed land plan is provided, first
flush storm flows from drainage area ‘A2’ will be captured prior to being discharged into the lagoon.
Drainage Area ‘B’
Storm runoff of 4.2 acre-feet from this drainage area will be retained within the proposed lake.
Drainage Area ‘C’
Storm runoff (roughly 1 acre-foot) for this drainage area will be conveyed to and retained in a temporary
retention basin located in Drainage Area ‘F’.
Drainage Area ‘D’
Storm runoff of approximately 3.1 acre-feet for this drainage area will be conveyed to and retained in the
proposed lake located within the “Farm”.
Drainage Area ‘E’
Storm runoff of approximately 5.7 acre-feet for this drainage area will be conveyed to and retained in a a large
basin located in along the southerly portion of Planning Area VIII (Area 5). This basin will also provide a
discharge location for the lagoon.
Drainage Area ‘F’
This area is a future low-density residential development. Once developed it is anticipated approximately 4.0
acre-feet of retention will be required.
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Preliminary Hydrology Report
4
Drainage Area ‘G’
This area is a future low-density residential development. Once developed it is anticipated approximately 3.4
acre-feet of retention will be required.
Drainage Area ‘H’
This area is a future commercial development. Once developed it is anticipated approximately 1.4 acre-feet of
retention will be required.
Drainage Area ‘I’
This area is a future low-density residential development. Once developed it is anticipated approximately 4.9
acre-feet of retention will be required.
PRELIMINARY WQMP ANALYSES
Preliminary design volume and flow for BMP measures were based on Worksheets 1 and 2 from the Riverside
County – Whitewater River Region Water Quality Management Plan. Impervious area for the drainage sub-
areas are derived from the preliminary land use worksheets. A summary of the BMP results are presented on
sheet 1 of the Hydrology Exhibits in Appendix H with the worksheets being included as Appendix G..
RESULTS AND CONCLUSIONS
As the above narrative and appendices confirm, the proposed retention basins are sufficiently sized to contain
the flood volume from the controlling 100-year storm. During the final design process, a more detailed
hydrologic report will be submitted to the City for review and approval.
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix G
AGREEMENTS – CC&RS, COVENANT AND AGREEMENTS, BMP
MAINTENANCE AGREEMENTS AND/OR OTHER
MECHANISMS FOR ENSURING ONGOING OPERATION,
MAINTENANCE, FUNDING AND TRANSFER OF
REQUIREMENTS FOR THIS PROJECT-SPECIFIC WQMP
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix H
PHASE 1 ENVIRONMENTAL SITE ASSESSMENT – SUMMARY OF SITE
REMEDIATION CONDUCTED AND USE RESTRICTIONS
(NOT AVAILABLE)
Whitewater River Region WQMP
The Wave at Coral Mountain
Appendix I
PROJECT-SPECIFIC WQMP SUMMARY DATA FORM
Project-Specific WQMP Summary Data Form
Applicant Information
Name and Title Garrett Simon
Company CM Wave Development, L.L.C.
Phone (970) 596-6642
Email gsimon@meriwetherco.com
Project Information
Project Name
(as shown on project application/project-specific WQMP)
The Wave at Coral Mountain
Street Address South of Avenue 58; West of Madison Street
Nearest Cross Streets Madison Street
Municipality
(City or Unincorporated County)
City of La Quinta
Zip Code 92253
Tract Number(s) and/or Assessor Parcel Number(s) Tentative Parcel Map No. 37815
Other
(other information to help identify location of project)
Indicate type of project. Priority Development Projects (Use an "X" in cell preceding project type):
SF hillside residence; impervious area ≥ 10,000 sq. ft.; Slope ≥ 25%
SF hillside residence; impervious area ≥ 10,000 sq. ft.; Slope ≥ 10% & erosive soils
X Commercial or Industrial ≥ 100,000 sq. ft. (Commercial Only)
Automotive repair shop
X Retail Gasoline Outlet disturbing > 5,000 sq. ft.
X Restaurant disturbing > 5,000 sq. ft.
X Home subdivision ≥ 10 housing units
X Parking lot ≥ 5,000 sq. ft. or ≥ 25 parking spaces
Date Project-Specific WQMP Submitted November 18, 2019
Size of Project Area (nearest 0.1 acre) 385.01 Acres
Will the project replace more than 50% of the impervious
surfaces on an existing developed site?
No
Project Area managed with LID/Site Design BMPs (nearest 0.1
acre)
385.01 Acres
Are Treatment Control BMPs required? No
Is the project subject to onsite retention by ordinance or policy? Yes
Did the project meet the 100% LID/Site Design Measurable
Goal?
Yes
Name of the entity that will implement, operate, and maintain
the post-construction BMPs
CM Wave Development, L.L.C.
Contact Name To Be Determined
Street or Mailing Address 2440 Junction Place, Suite 200
City Boulder, CO
Zip Code 80301
Phone (970) 596-6642
Space Below for Use by City/County Staff Only
Preceding Information Verified by
(consistent with information in project-specific WQMP)
Name:
Date:
Date Project-Specific WQMP Approved:
Data Entered by Name:
Date:
Other Comments