Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Proposal - Watearth
Proposal for City of La Quinta Miscellaneous Retention Basin Improvements Project No. 2023-35. Carley Escarrega City of La Quinta 78495 Calle Tampico La Quinta, CA, 92253 Contact Watearth CEO Jennifer J. Walker PE, DWRE, ENV SP, CFM, QSD, LEED AP BD+C 3371 Glendale Blvd, Suite 100 Los Angeles, CA, 90039 213.248.4554 jwalker@watearth.com Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 1. Cover Letter Hi Carley, I’m Jennifer J. Walker, from . I’m excited to share our proposal for Miscellaneous Retention Basin Improvements. We know the City of La Quinta is looking for expert support to enhance the percolation, functionality, and efficiency of its retention basins, and we’d love to help. Stormwater management in La Quinta has faced challenges, especially during heavy storms. The flooding in September 2014 highlighted the city’s drainage vulnerabilities, prompting infrastructure improvements. Since then, La Quinta has invested approximately $15.5 million in drainage upgrades across Eisenhower Drive, Calle Tampico, Washington Street, Dune Palms Road, and SilverRock Park (Source: laquintaca.gov). These efforts help protect the city while preserving its natural beauty as the gem of the desert. This project focuses on three critical retention basins: • Cactus Flower Neighborhood Basin: Replacing a non-operable dry well system to restore functionality. • Topaz Neighborhood Basin: Improving drainage and percolation rates to prevent standing water. • X-Park Basin: Designing a new dry well system to enhance water infiltration. Watearth is a Small Business/WBE Engineering Firm, independently owned and not part of a parent company. Our experts have decades of experience in stormwater management, drainage system design, and infrastructure improvements. We have been in business for 16 years and our taxpayer ID is 26-3679313. The firm was incorporated in Texas on 11/6/2008. The location of our firm’s main office is 3371 Glendale Blvd, Suite 100, Los Angeles, CA 90039 and the location of this office that would service this project is in Palm Springs. We're a weird group of half engineers and half environmental professionals. We focus on civil engineering, water resources, and environmental services. Our team brings decades of hands-on experience. We understand the technical challenges of projects like this and the importance of practical, long-lasting solutions. Our approach ensures cost-effective and maintainable designs, all while keeping communication clear and transparent. If you want an engineer, you have options. If you want a partner who reduces stress, navigates city challenges, ensures grant compliance, and delivers long-term solutions—Watearth is the team for the job. Our TRUSTED Signature Project Delivery™ process follows a seven-step method to ensure technical excellence and efficiency. Our experience extends beyond La Quinta. We are the prime consultant for the City of Redlands Country Club Drainage Study and the City of Redlands Drainage Study for San Timoteo and Live Oak Canyon Roads. We have also worked on LACPW’s stormwater capture and infiltration projects, including dry wells. These projects show our ability to assess drainage challenges and develop effective, sustainable solutions. We confirm that: • Validity: All information and pricing in this proposal are valid for at least ninety (90) days from March 4, 2025. • No Conflicts of Interest: Watearth and its personnel have no conflicts of interest related to this project. • Team Availability: Our proposed project team will be available throughout the contract period and will collaborate closely with City staff to ensure a timely and successful project completion. We truly appreciate the opportunity to submit this proposal and look forward to working with the City of La Quinta on this important project. Our team is passionate about finding smart, effective solutions that protect land and improve drainage. Let’s work together to build a more resilient future. If you have any questions, feel free to contact me at 213.248.4554 or jwalker@watearth.com.I look forward to working with and serving the City of La Quinta. Sincerely, Jennifer J. Walker PE, D.WRE, ENV SP, CFM, QSD President Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 2. References of California Government Agencies References of California Government Agencies La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. References 1. City of Redlands a. City of Redlands, Goutam Dobey – City Engineer, (909) 798-7584 Ext. 2, gdobey@cityofredlands.org b. Watearth provided an analysis of the Redlands Country Club Golf Course and contributing watershed for flood risk and identifying potential mitigation measures. Flood mitigation measures were developed to reduce peak flows and flow volume at each discharge point with the goal of reducing flooding and erosion/sedimentation within the golf course. Provided expertise in hydrology and hydraulics, spatial analysis, modeling, and design to successfully execute this project. c. February 2023 – September 2023 d. Jennifer J. Walker, Jeremy Liby, Brian Meade e. Watearth proposed drainage solutions to benefit Redlands Country Club golf course and addressed any City deficiencies previously overlooked. Watearth addressed peak flows and CEQA requirements and provided a level of responsibility to be taken on by both the City and the golf course. Watearth balanced priorities professionally and with sensitive matters in a way that satisfied both parties. 2. City of Rancho Palos Verdes a. City of Rancho Palos Verdes, Jeremiah Sunwoo – Associate Engineer, (310) 544-5253, jsunwoo@rpvca.gov b. Watearth conducted site investigation and data collection for high-priority sidewalk repairs. Developed cost-saving field plan and performed detailed surveys. Prepared technical memorandum with recommendations and feasibility assessments. Ensured ADA compliance. Provided evidence for City Engineering staff to secure City Council approval for Phase 2 design solutions. c. August 2024 – Ongoing d. Jennifer J. Walker, Jeremy Liby, Brian Meade, Shawn Khazey, Mark A. Locke e. Watearth completed Phase 1 of this project. The initial phase helped us categorize each priority repair for a cost effective option for each location. Different options include proposing standard repairs for City maintenance staff or more detailed repairs that require more in depth designs and plans. 3. City of Calabasas a. City of Calabasas, Curtis Castle – Public Works Director/City Engineer, (818) 224-1600, ccastle@cityofcalabasas.com b. On this PS&E Phase III design project, Watearth will address erosion and habitat damage caused by the Woolsey Fires and storm events. We will also stabilize creek banks, extend trails, and ensure compliance with CDFW regulations, repair and install rip rap at 26 outlets and extend the lower trail by approximately 2,500 linear feet. We will address slope protection and erosion control and develop detailed construction plans and specifications. For permitting and environmental documentation, the team will prepare CEQA Initial Study/Mitigated Negative Declaration (IS/MND) and a NEPA Environmental Assessment (EA). We will develop a Mitigation Monitoring and Reporting Program (MMRP) and submit permit applications to various regulatory agencies. Our staff will conduct an internal kick-off meeting with City staff, facilitate workshops and commission workshops after 30% and 60% design completion. Will present project updates to the Calabasas City Council at 60% and final design stages. We will develop detailed construction bid documents, including plans, specifications, and cost estimates (PS&E). c. November 2024 – Ongoing References of California Government Agencies La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. d. Jennifer J. Walker, Jeremy Liby, Brian Meade, Shawn Khazey, Mark A. Locke e. Watearth proposed additional design elements that preserve not only natural beauty but also contribute to better water quality. These items will not only provide the City additional opportunity for more funding but will also address the primary concerns of the public that will be using the recreational trails being designed and improved. Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 3. Staffing and Project Organization Brian Meade Senior Designer Mark Alan Locke PE Independent Peer Review Organization Chart Shawn Khazey Civil Engineer & Field Survey The Project Manager and Key Staff will remain assigned to this project through the completion of the Scope of Services. Additional staff will be provided if needed. Recommendation, Civil Design Quality Assurance/Control Geotechnical ConsultantTerraCon Watearth © 2025 Ubaldo Ayón, Jr., Assistant Construction Manager Jennifer J. Walker PE, DWRE, ENV SP, CFM, QSD, LEED AP BD+C Principal Civil Engineer Principal Engineer/PE of Record Senior Project Manager Jeremy Liby Project Management Field Civil Engineer Senior Project ManagerCarlos V. Amante, PE, GE Carlos Quispe Design Engineer Civil Design Deputy Project Manager Jacob Guise Project Management Key Staff Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 4. Subcontracting Services Subcontracting Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Subcontracting Services Terracon will be providing geotechnical services for the geotechnical portion of the Miscellaneous Retention Basin Improvements project. Terracon has provided geotechnical engineering services for over 100 projects within the City and surrounding communities. Watearth and Terracon are actively working together on other projects including an On-Call Environmental Consulting Services project. Wateath has a geotechnical understanding to manage Terracon well and benefits from their additional expertise in this sensitive area. Watearth is experienced with surface infiltration testing and managing subconsultants on large stormwater capture projects such as LACPW Adventure Park, Harbor Park, and Sorensen Park. Terracon will complete geotechnical site visits to assess existing subgrade soils and slopes. These site visits will provide critical information for design, including slope stability analysis. Terracon will complete background geotechnical reviews as well, utilizing readily available geotechnical reports from nearby and adjacent projects, regional geologic maps, aerial photographs, and geotechnical maps. Terracon will collect undisturbed and bulk samples of existing materials for laboratory testing. This evaluation will help assess the engineering characteristics of on-site materials and any imported materials. Terracon also will prepare geotechnical reports that present findings, soil and engineering analyses, conclusions, and recommendations. These reports will cover various aspects, including materials testing and design parameters. On this Miscellaneous Retention Basin Improvements Project, Terracon will provide soil investigations, percolation testing, and a geotechnical analysis to ensure the stormwater basins function effectively. Tasks include Task 2b. Develop Geotechnical Testing Boring Layout and Elevations, where Terracon will use handheld GPS equipment to locate soil borings. Field measurements may be utilized. Other tasks include Task 2f. Perform Geotechnical testing, consisting of five auger borings (soil drilling). Samples will be obtained and collected during drilling, taken to laboratory testing, and classified by a geotechnical engineer. Groundwater levels will be observed as well, if encountered. Terracon will prepare field boring logs with sampling depths, penetration distances, and other relevant sampling information. Final boring logs are prepared from field logs and represent the geotechnical engineer’s interpretation with modifications based on observations and laboratory tests. On Task 2g, Terracon will use three borings within infiltration areas for percolation testing (soil drainage test). After drilling, a 2-inch gravel layer will be placed at the bottom of each test boring. A 3-inch PVC pipe will be inserted on top of the gravel, with additional gravel filling the space between the pipe and the boring walls. The borings will then be pre-soaked with water for the required period. During testing, the pipes will be refilled, and water levels will be measured at specific time intervals to determine how quickly water infiltrates into the soil. On Task 2h, Terracon will backfill test borings with drill cuttings, and any excess material will be stored in 55-gallon drums for testing and disposal. If permitted, the drums will be temporarily stored on-site before removal; otherwise, they must be picked up daily at an additional cost. The cuttings will be tested for contaminants, and if found clean, they will be disposed of at an approved facility after the property owner signs the waste manifest. Terracon will backfill boreholes and patch surfaces with matching materials but does not include hot-mix asphalt patching or further site repairs; settling may occur over time, and additional backfilling can be provided upon request. Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 5. Project Understanding and Approach Project Understanding and Approach La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Project Understanding and Approach Project Understanding The City of La Quinta seeks engineering services for designing improvements to three retention basins that experience poor drainage, slow infiltration, and standing water issues. The three basins are crucial in capturing stormwater runoff, preventing flooding, and allowing water to infiltrate into the ground. The primary objective of this project is to enhance percolation (filter gradually through a porous surface), efficiency, prevent sediment buildup, and improve overall drainage functionality while ensuring compliance with regulatory standards and minimizing maintenance needs. The existing drywells in these basins are either outdated or insufficient, leading to water stagnation and reduced infiltration capacity. The project will focus on replacing drywells, improving infiltration, and optimizing basin designs to support effective stormwater control. These improvements will also consider long-term maintenance feasibility, ensuring that the upgraded infrastructure remains effective over time with minimal upkeep. The final deliverables will include plans, specifications, and an engineer’s estimate (PS&E) for construction-ready implementation. The improvements must integrate with the City’s stormwater management plan, addressing runoff collection, infiltration, and system resilience to varying storm events. Retention Basin at Cactus Flower Neighborhood This first basin at the northeast corner of Buttercup Lane and Goldenrod Circle is experiencing issues due to a non- operational and an unmaintainable drywell system, leading to ineffective stormwater percolation and water retention. Watearth will: • Perform a site assessment to determine soil permeability, the condition of existing infrastructure, and necessary modifications. • Design a new drywell system to ensure proper drainage to keep the basin functional for the long term. • Assess whether additional scarification (the process of loosening compacted soil to improve water infiltration) is required to enhance percolation. • Ensure the new drywell system is maintainable, addressing past issues to reduce future maintenance costs. Retention Basin at Topaz Neighborhood Located on the south side of Desert Stream Drive, between Desert Fox Drive and Desert Eagle Court, this second retention basin has slow drainage and sediment accumulation due to silty runoff from a nearby Coachella Valley Water District (CVWD) wellsite. Watearth will address the following improvements: Slow Drainage Issues at the Retention Basin at Topaz Neighborhood Site Visit to the Retention Basin at Cactus Flower Neighborhood Project Understanding and Approach La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. • Increase percolation capacity by designing a system that enhances water infiltration/absorption while preventing standing water. • Implement measures to reduce silt and sediment buildup, such as installing filtration barriers or sediment forebays to trap fine particles before they enter the basin. • Evaluate and, if necessary, redesign the adjacent catch basin system to improve efficiency. The current system includes two inlets and a drywell that occasionally overflows into the retention basin. • Ensure the new drainage design integrates with existing infrastructure while preventing clogging and improving drainage problems. Retention Basin at the X-Park The third basin is located on the south side of Westward Ho Drive, just east of Dune Palms Road. The basin requires improvements to enhance percolation and address standing water issues. Watearth will: • Review the existing hydrology memo and geotechnical report to understand how water moves through the area. • Assess the current basin geometry to determine whether modifications to depth, slope, or grading are required for better drainage. • Design a drywell system that maximizes percolation, ensuring alignment with the basin’s intended capacity and functionality. • Verify that the new system meets regulatory requirements and integrates with the overall stormwater management plan for the area. Project Approach This project will evaluate and improve three retention basins in La Quinta to ensure proper drainage, prevent standing water, and efficient functioning. The approach involves on-site inspections, drainage analysis, engineering design, and construction support to create long- lasting solutions. 1. Site Assessments & Data Collection 1.1 Site Survey and Data Collection: Perform a site visit to each site to inspect the basins, check drainage, and identify problem areas providing detailed topographical data and identifying low-lying areas prone to water retention. Revision of as-builts of the existing drywells to determine if they need repairing, updating, or replacing. 1.2 Existing Storm Drain Infrastructure: As-built will be assessed for the existing drywells to determine if they need repairing, updating or replacing and, preventing damage while determining required improvements. Confirm the depth of current drywells and potential depth of new drywells. Standing Water at the Retention Basin at Topaz Neighborhood Standing Water at X-Park Project Understanding and Approach La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 1.3 Geotechnical and Infiltration Testing: Terracon will test soil and infiltration rates of water into the ground. Terracon will complete in-situ tests (i.e. permeability tests, CPT, SPT) to assess drainage and groundwater. Results of this will be in a technical memorandum. 1.4 Utility Locate and Survey: Identifying utility lines, property lines and easements to avoid conflicts with new construction. 2. Drainage Analysis & Problem-Solving Using data from the assessments, we will analyze water movement in and out of the basins. The focus will be on: • Designing better infiltration solutions: Implement a combination of engineered drywells and permeable subsurface layers, such as gravel and sand filters, to enhance infiltration rates. • Preventing clogging from sediment and debris: Introduce pre- treatment measures such as sediment forebays, vegetative buffers, or proprietary sediment-trapping devices to capture debris before entering infiltration systems. Establish a routine maintenance schedule with clear guidelines for sediment removal and debris management. • Ensuring overflow systems are adequately designed for large rain events: Design overflow structures with enhanced capacity, incorporating emergency spillways and high-capacity drains to handle extreme weather events. For the Topaz Neighborhood basin, we will also examine the catch basin system and determine if modifications are needed to improve drainage. We will evaluate and potentially modify the existing catch basin system by: • Increasing inlet capacity with additional grates or expanded openings. • Optimizing pipe sizing and slopes to improve flow efficiency. 3. Engineering Design & Construction Plans We will develop construction-ready plans that include: • New or updated drywells designed to improve infiltration. • Regrading or reshaping basins to improve water flow. • Filtration systems to keep sediment from clogging drainage. • Cost estimates and construction plans and specifications for City approval. The designs will meet City stormwater regulations and ensure easy maintenance for Public Works crews. 4. Sustainability & Long-Term Maintenance To extend the life of these improvements and minimize upkeep costs, we will: • Add erosion control measures to prevent soil buildup. • Design for future climate conditions to handle both small and large storms effectively. Sandy Soil at X-Park Site Visit at X-Park Project Understanding and Approach La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Optional Task: Maintenance (O&M) Manual To ensure the long-term functionality and effectiveness of the drainage improvements, an optional task for developing an Operations & Maintenance (O&M) Manual is proposed. This manual will: • Provide clear, step-by-step guidance on maintenance procedures for infiltration systems, sediment control structures, and overflow mechanisms. • Outline best management practices (BMPs) for ongoing inspection, cleaning, and performance monitoring. • Reference proven O&M strategies used by agencies such as Los Angeles County Public Works (LACPW) and smaller municipalities like the City of Citrus Heights. • Incorporate insights from the City of Santa Monica BMPs O&M Manual, developed by Watearth nearly 15 years ago, which remains a relied-upon resource due to its simplicity and effectiveness. • Include staff training recommendations to ensure that maintenance personnel are equipped with the knowledge and tools necessary for proper system upkeep. This optional task include Watearth’s expertise in stormwater system maintenance, providing a practical and user-friendly document that enables municipalities to sustain long-term drainage performance with minimal operational challenges. 5. Construction Support & Oversight During construction, we will: • Help select the appropriate contractor. • Ensure construction follows design plans and construction specifications. • Provide final inspection and as-built documentation. Watearth has the exact type of infiltration project experience and have proactively caught contractor issues; On a previous project in Fontana, we noticed tire tracks on bioretention features, saving the client increased maintenance from additional remediation/reconstruction. Conclusion This project will eliminate standing water, improve drainage, and extend the life of three retention basins in La Quinta. By combining efficient design, practical solutions, and sustainable features, we ensure effective stormwater management for years to come. Erosion near the Retention Basin at Topaz Neighborhood Site Visit to the Retention Basin at Cactus Flower Neighborhood Your team did a really good job. Would love to see the map of this process. Glad there are people who can do this kind of work. Eric Veium Cal Poly San Luis Obispo Project Understanding and Approach La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Specific Challenges Our Solutions Evidence of Qualifications Regulatory Compliance Challenges: Compliance with the Coachella Valley Water District (CVWD) encroachment permit and City of La Quinta permit and permitting processes is time sensitive. Watearth will navigate multi-agency permitting requirements, ensuring compliance both permitting processes. Our team will proactively manage to keep projects on schedule and avoid costly delays. Successfully permitted projects like the Adventure Park Runoff and Stormwater Capture Project and Sorensen Park Multi-Benefit Stormwater Feasibility Study, demonstrating expertise in multi-agency compliance and regulatory navigation. Budget Constraints: Tight municipal budgets require cost- effective designs, efficient use of resources, and the ability to leverage external funding sources. Our team specializes in designing cost-effective stormwater solutions, Plans Specifications and Estimates (PS&E), and optimizing funding strategies for grant funded projects. We incorporate value engineering to keep costs in check while maximizing project impact. Successfully executed more than 20 grant-funded projects, including the Nuview Union School District Stormwater Infiltration Project, where value engineering kept costs within budget. For the Adventure Park Project, we ensured Los Angeles County secured the full $15M Caltrans grant and additional Safe Clean Water funding by meeting strict spending deadlines. Project Management Strains: Effective project coordination is critical for managing stakeholders, avoiding delays, and ensuring smooth execution. Watearth uses its TRUSTED™ Signature Project Delivery Process, ensuring structured project management, proactive coordination, and clear communication throughout the project. Our team managed large- scale municipal projects, coordinated multiple stakeholders while maintaining timelines as demonstrated in the Harbor Park Regional Stormwater Capture Feasibility Study. Communication Issues with Consultants: Agencies require clear, responsive, and proactive communication from consultants to prevent misunderstandings and project setbacks. We prioritize frequent, transparent communication through regular meetings, real-time project tracking through Earned value tracking (EVT), and a dedicated point of contact for seamless collaboration. Our 95% client satisfaction rating demonstrates our commitment to responsive communication, reliability, and project transparency. Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 6. Scope of Services Scope of Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Scope of Services Task 1: Attend Meetings a. Schedule and Attend Pre-Design Meeting: Schedule and attend a predesign meeting before design work begins with City of La Quinta staff to confirm project objectives, discuss known issues, and establish clear expectations. Define key milestones, establish communication protocols, and identify any additional data or reports required for evaluation. This meeting may occur either in person or virtually, and is expected to last 2 hours, with up to two Watearth staff in attendance. b. Schedule and Chair Monthly Progress Meetings: Schedule and chair (lead) up to 13 virtual monthly progress update meetings. Provide updates on design development, address City concerns, and discuss field discoveries that may affect design choices. Task 2: Evaluate Retention Basins (Field Work) a. Perform Field Assessment: Perform field assessment with City staff in attendance at each retention basin project site. Observe land use, hydrologic, and hydraulic characteristics. Document results of site visit with photographs and field notes. Observe outfalls/discharges. Identify apparent deficiencies contributing to slow percolation and standing water. Take field measurements and photographs for documentation and design reference. The field assessment aims to evaluate causes of failure or Performance Issues. This will allow us to understand the root cause and then to correct the root cause in addition to fixing the dry wells. b. Develop Geotechnical Testing Boring Layout and Elevations: Terracon will use handheld GPS equipment to locate borings with an estimated horizontal accuracy of +/-20 feet. Field measurements from existing site features may be utilized. If available, approximate elevations will be obtained by interpolation from a site-specific, surveyed topographic map, otherwise Google Earth will be used. c. Apply for CVWD Permit: Apply for an encroachment permit expected to be required by the Coachella Valley Water District (CVWD) for geotechnical work. The cost of this permit is expected to be paid directly by the City and is not included in our fee. d. Apply for City of La Quinta Permit: We assume the borings will be advanced within the right of way of the City of La Quinta. Therefore, encroachment permits will be required. Includes application for an encroachment permit. However, we assume the fees associated with an encroachment permit will be waived by the City, thus the permit fee cost (if any) is not included in our proposal. e. Prepare Workzone Traffic Control Plan (WZTCP): Prepare traffic control plans (if required) and arrange for a subcontractor to provide traffic control. Our traffic control will be performed based on the guidelines presented in the MUTCD. Fees associated with a traffic control subcontractor are included in this proposal. f. Perform Geotechnical Testing: Perform geotechnical testing consisting of five hollow-stem auger borings as summarized in the following table. Boring # Proposed Test Test Location Planned Boring Depth (ft) B-1 Soil Characterization Cactus Flower Neighborhood 35 Scope of Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. P-1 Percolation Testing Cactus Flower Neighborhood 25 B-2 Soil Characterization Topaz Neighborhood 35 P-2 Percolation Testing Topaz Neighborhood 25 P-3 Percolation Testing X-Park 25 B-2 will be used for soil characterization of both Topaz Neighborhood and X-Park sites. Advance the soil borings with a track-mounted drill rig using continuous flight augers. Four samples will be obtained in the upper 10 feet of each boring and at intervals of 5 feet thereafter. Test samples will be collected during drilling in general accordance with the appropriate ASTM methods using Standard Penetration Testing (SPT) and sampling using either standard split-spoon or Modified California samplers. A sampling spoon is driven into the ground by a 140-pound automatic hammer dropped a distance of 30 inches. The number of blows required to advance the sampling spoon the last 12 inches of a normal 18-inch penetration is recorded as the Standard Penetration Test (SPT) resistance value, also referred to as N-values. The N-values are indicated on the boring logs at the test depths. The samples are placed in appropriate containers, taken to our soil laboratory for testing, and classified by a geotechnical engineer. In addition, we will observe and record groundwater levels (if encountered) during drilling and sampling. Prepare field boring logs as part of standard drilling operations including sampling depths, penetration distances, and other relevant sampling information. Field logs include visual classifications of materials encountered during drilling, as well as our interpretation of subsurface conditions between samples. Final boring logs, prepared from field logs, represent the Geotechnical Engineer's interpretation and include modifications based on observations and laboratory tests. g. Perform Percolation Testing: Terracon will use three (3) borings proposed within the infiltration areas will be utilized for percolation testing following Riverside County procedures. Upon completion of drilling and sampling, a 2-inch thick layer of gravel will be placed in the bottom of the percolation test borings. A 3-inch diameter PVC pipe will be installed on top of the gravel layer in each boring. Gravel will be used to backfill between the pipes and the boring sidewall. The borings then will be filled with water for the minimum pre-soak period. At the beginning of each test, the pipes will be refilled with water and readings will be taken at a standardized time interval based on County requirements. h. Repair Property Disturbance: Terracon will backfill borings with drill cuttings. Excess auger cuttings will be collected in 55-gallon drums, if required. We assume the drums can be stored in a designated area by the City temporarily and can be picked up after testing for disposal has been completed. If the City does not authorize the temporary storage of the drums, the drums will need to be picked up at the end of each field exploration day. Fees associated with picking up the drums at the end of each field exploration day are not included in this proposal. The cuttings will be tested for the presence of environmental contaminants. After results of the testing are received, the drums will be disposed of off-site at a receiving facility. In order to have the drums disposed, the owner of the property will need to sign the waste manifest prior to drum pickup. We have assumed the testing will result in clean soil in our fee which is listed as a separate line item in the Compensation section of this proposal. If the testing results in contaminated soil. We will consult with the owner regarding the options for disposal and associated fees. Scope of Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Terracon’s services do not include repair of the site beyond backfilling our boreholes and patching the surface with matching surface material. Hot-mix asphalt patching is not included within our scope of services. The backfill material often settles below the surface after a period, we recommend boreholes to be periodically checked and backfilled, if necessary. Terracon can provide this service at your request. Terracon will take reasonable efforts to reduce damage to the property, such as rutting of the ground surface. However, it should also be understood that in the normal course of our work some such disturbance could occur. Our services do not include repair of the site beyond backfilling our boreholes and patching the surface. i. Perform Field Survey: Provide field survey services at three (3) site locations, one for each of the basins. A civil basemap plan focused on grading and drainage and other significant topographical features will be prepared to support the development of concept design in a later task. Boundary survey and ground penetrating radar subsurface survey is not included. This task assumes one field staff member. Task 3: Develop Plans, Specifications, and Estimates Drainage Analysis & Problem-Solving Our approach to the drainage analysis is rooted in an evaluation of water movement within and around the project basins. Utilizing data from detailed site assessments, we will implement targeted strategies to enhance infiltration capacity, mitigate sedimentation risks, and ensure robust overflow management. The scope of work encompasses the following key areas: • Infiltration Solutions: To optimize water absorption and reduce surface runoff, we will design and integrate advanced infiltration solutions. This will involve the strategic placement of engineered drywells combined with permeable subsurface layers, such as gravel and sand filters, to enhance percolation rates. These systems will be tailored to site-specific conditions, ensuring maximum efficiency in directing stormwater into the ground while preventing excessive ponding or surface erosion. • Sediment and Debris Management: Preventing clogging within infiltration systems is essential to maintaining long-term functionality. Our approach will incorporate pre- treatment measures, such as sediment forebays, vegetative buffers, and proprietary sediment-trapping devices, to intercept debris before it reaches critical infiltration points. Additionally, we will develop a structured maintenance program with clear guidelines for periodic sediment removal and debris management. This will include recommended inspection intervals and best practices for ensuring system efficiency over time. • Overflow System Design: To mitigate risks associated with large storm events, we will evaluate and enhance overflow system capacity. Our design strategy will focus on integrating emergency spillways and high-capacity drainage infrastructure capable of accommodating extreme weather conditions. These features will be engineered to provide a controlled flow path for excess water, reducing the likelihood of flooding and system failure during peak storm events. • Through a combination of these strategies, our drainage analysis and problem-solving efforts will improve stormwater management, minimize risks of clogging and overflow, and ensure the long-term resilience of the drainage infrastructure. The proposed solutions will be tailored to site-specific conditions, supported by data-driven analysis, and designed to meet regulatory standards and environmental best practices. Scope of Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. a. Develop 35% PS&E: Develop civil design sheets (per national CAD standards), and preliminary estimates to a 35% standard. Site hydrology will not be modeled. Establish a general design direction, key drainage components, and basin modifications. Develop geometric approval drawings, illustrating preliminary geometric layout. Identify and contact utility providers (water, sewer, gas, and electric) to determine and document potential conflicts with proposed improvements. Submit approval drawings for "concept review." Include up to 2 revisions and re-submittals during the concept review stage, incorporating feedback and revising drawings as necessary to achieve City approval. It is assumed that the City will consolidate and deconflict comments before instructing Watearth to make revisions. b. Develop 65% PS&E: Reference the BOD document for design requirements. Develop 65% PS&E by expanding on the concept design to include the complete drainage system layout, specific construction details, and material selections. Submit a complete set of plans, including all sheets in the plan set, and a complete set of specifications. Some details may be omitted at this stage, but plan and specification sections representing all disciplines will be included. Work with utility companies to design relocation or adjustment of underground lines as necessary to prevent interference with drywell installations or regrading work. Comments on this milestone will be incorporated directly into the 90% milestone. c. Develop 90% PS&E: Develop 90% PS&E, including fully detailed, construction-ready plans and specifications that have incorporated all City comments and meet regulatory requirements. Submit plans that have been independently checked by a 3rd party within the organization for completeness and accuracy. Complete the project specifications and engineer's estimate. Comments on this milestone will be incorporated directly into the 100%/Final milestone. d. Develop 100% Final PS&E: Develop the 100%/Final PS&E package based on consolidated and deconflicted comments received from the City. Provide all approved plans to the City in AutoCAD 2023 or higher format and PDF. Provide specification documents, including technical specifications, in Microsoft Word for Windows format with all hidden text shown as well as in PDF. Provide the Engineer’s estimate in Excel for Windows format as well as PDF. e. Submit Final Plans to City Council: Submit final plans approved by City staff to the City Council for approval. f. Prepare Utility Letters: Prepare utility letters and provide them to the City for transmission to Utility Companies. Coordinate relocations and adjustments only when specific requests are made by the Utility Companies or if required for project implementation. Independent Peer Review All Plans, Specifications, and Estimates will be reviewed by Watearth’s Mark A. Locke, PE. Locke will perform 3rd party QA/QC review. Task 4: Provide Bid and Construction Phase Support a. Respond to Bid-Phase RFIs: Respond to up to 10 Bid-Phase Requests for Information (RFIs) from prospective contractors. Requests are expected to be received by the City and passed to Watearth. Scope of Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. b. Evaluate Bids: Evaluate Bids in tandem with City staff evaluators. Provide recommendations for award to contractor whose bid best aligns with design requirements, specifications, project scope, and budget goals. c. Provide Construction Inspections: Provide up to 15 construction inspections (up to 6 hours each visit) focused on evaluation of construction progress and alignment with design documents. Record field notes and photographs and provide to City within 48 hours. Contractor or City is expected to provide a resident engineer. Constructing a retention basin involves meticulous planning and execution to ensure effective stormwater management. Based on industry standards and similar projects, here are ten essential items to include in a construction inspection checklist for such a project: 1. Site Preparation and Excavation: Verify that the excavation aligns with the approved design, ensuring accurate location, depth, and stable side slopes. 2. Inlet and Outlet Structures: Inspect the construction of inlet and outlet structures for structural integrity, proper placement, and confirm that they are free from debris and obstructions. 3. Subgrade Preparation: Confirm that the basin floor subgrade is prepared correctly, including any necessary ripping or loosening of native soils to promote infiltration. 4. Drainage Features: Inspect the installation of any underdrains, ensuring perforated pipes are correctly oriented and connected to facilitate proper drainage. 5. Vegetation and Landscaping: Verify that vegetation is established as per the design, ensuring plantings are appropriate for the local climate and capable of withstanding stormwater conditions. 6. Erosion and Sediment Control: Ensure that measures are in place to prevent erosion during construction, such as silt fences or sediment basins, and that they are functioning effectively. 7. Safety Features: Check for the installation of safety features like signage, fencing, or barriers to prevent unauthorized access to the retention basin area. 8. Final Grading and Stabilization: Confirm that the final grading directs water towards the basin's inlet, prevents standing water in unintended areas, and that all disturbed areas are stabilized to prevent erosion d. Final Review & As-Built Documentation: Verify completed work at each site and review as-built or redline markup drawings by contractor documenting final construction details submitted by the contractor as required by the construction specifications. List of Deliverables • 1st Review - 35% PS&E Package At the Concept Review stage, our firm will submit geometric approval drawings that outline the preliminary geometric layout and initial estimates. We will identify and note any utility conflicts to allow for early planning in clearing utilities. It's important to note that this stage may involve revisions and re-submittals before receiving authorization to move forward. Ensuring the concept is correct at this stage is crucial for the efficient progression of the custom design process. • 2nd Review -65% PS&E Package Scope of Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Our firm will prepare and submit the 65% Unchecked Details package, ensuring a complete set of plans and specifications. The submission will include all required plan sheets across disciplines, formatted per project standards, with minor detailing omissions where permissible. Additionally, we will compile a full set of specifications, ensuring consistency with the plans. Before submission, we will conduct an internal compliance review to confirm adherence to project guidelines. Our goal is to deliver a thorough and accurate package that meets all requirements for the 2nd Review.. • 3rd Review - 90% - 100% PS&E Package At the 90-100% Check stage, our firm will submit the final, complete set of plans, specifications, and estimates (PS&E) necessary for project construction. These documents will have been independently reviewed for completeness and accuracy by a third-party within our organization. Based on feedback from the City, we will revise the plans, specifications, and estimates as needed before resubmitting. Once approved by staff, the PS&E will be presented to the City Council for final approval. We will provide all approved plans in AutoCAD 2023 or higher format and PDF, specifications in both Microsoft Word (with all hidden text visible) and PDF, and the engineer's estimate in both Excel and PDF formats. • Draft Technical Memorandum of Geotechnical Testing Results • Final Technical Memorandum of Geotechnical Testing Results • Permitting Applications • Workzone Traffic Control Plan (WZTCP) Assumptions • It is assumed that all work will be performed in the calendar year 2025. Billing rates and budget values are predicated on this assumption and on the stated number of revisions. Delays or extensions of work into future years due to client delays in providing comments, approvals, or necessary data will impact overall cost, including potential billing rate increases and remobilization costs. • If construction extends into 2026, a revised budget will be required to account for updated labor rates, material cost escalations, and any additional mobilization or coordination efforts. Rates for engineering support during construction in 2026 will be subject to an annual cost adjustment based on industry-standard inflationary factors and market conditions. • It is assumed that comments by individuals or by multiple associated reviewers (such as multiple departments from the same agency) will be consolidated and deconflicted before being provided to Watearth. • It is assumed that each deliverable other than those identified as “final” will be subject to one round of comments unless otherwise specified within this scope, which will be provided to Watearth two weeks following submission of deliverables. Additional rounds of revision due to changes in project direction will be billed on a time and materials basis. • It is assumed that this scope includes coordination and communication efforts, as well as attendance at 13 meetings with Client, one of which will be in person and the rest of which will be conducted virtually. Scope of Services La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. • It is assumed that any permit enforced by the City itself will have its fee waived; thus no expense is included within this proposal. Possible Additional Services The following tasks are not included in this proposal, and could be authorized as additional services or as part of future phases of work: • Exclude performing a land survey with topographical equipment; • Exclude drainage, water quality and hydrology/hydraulics modeling. • Exclude value engineering and as-built drawings. • Exclude environmental services. • Exclude maintenance. Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 7. Project Schedule Schedule La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Schedule 0 5 10 15 20 25 30 35 40 45 50 BID AND CONSTRUCTION PHASE TASKS ANTICIPATED TO START 3 MONTH AFTER FINAL DESIGN - LENGTH TBD Task 3f: Prepare Utility Letters Task 3e: Submit Final Plans to City Council Task 3d: Develop 100% Final PS&E Task 3c: Develop 90% PS&E Task 3b: Develop 65% PS&E Task 3a: Develop 35% PS&E Task 2i: Perform Topographic Survey Task 2h: Repair Property Disturbance Task 2g: Perform Percolation Testing Task 2f: Perform Geotechnical Testing Task 2e: Prepare Workzone Traffic Control Plan (WZTCP) Task 2d: Apply for City of La Quinta Permit Task 2c: Apply for CVWD Permit Task 2b: Develop Geotechnical Testing Boring Layout and Elevations Task 2a: Perform Field Assessment Task 1b: Schedule and Chair Monthly Progress Meetings Task 1a: Schedule and Attend Pre-Design Meeting Estimated Project Schedule, Weeks (Review Timeframes are Included) Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 8. Disclosures Disclosures La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. There are no alleged significant prior or ongoing agreement failure, any civil or criminal litigation or investigation pending, which involved the proposer or which the proposer has been judged guilty or liable within the last five (5) years. We affirm there is no negative history to disclose. Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. 9. Attachments, 2, 3, 4 Page 12 of 14 ATTACHMENT 2 INSURANCE REQUIREMENTS ACKNOWLEDGEMENT Must be executed by proposer and submitted with the proposal I, ________________________________________ (name) hereby acknowledge and confirm that __________________________________ (name of company) has reviewed the City’s indemnification and minimum insurance requirements as listed in Exhibits E and F of the City’s Agreement for Contract Services (Attachment 1); and declare that insurance certificates and endorsements verifying compliance will be provided if an agreement is awarded. I am _________________________________ of ______________________________, (Title) (Company) Commercial General Liability (at least as broad as ISO CG 0001) $1,000,000 (per occurrence); $2,000,000 (general aggregate) Must include the following endorsements: General Liability Additional Insured General Liability Primary and Noncontributory Commercial Auto Liability (at least as broad as ISO CA 0001) $1,000,000 (per accident) Personal Auto Declaration Page if applicable Errors and Omissions Liability $1,000,000 (per claim and aggregate) Worker’s Compensation (per statutory requirements) Must include the following endorsements: Worker’s Compensation Waiver of Subrogation Worker’s Compensation Declaration of Sole Proprietor if applicable Jennifer J. Walker Watearth, Inc. President/CEO Watearth, Inc. Page 13 of 14 ATTACHMENT 3 NON-COLLUSION AFFIDAVIT FORM Must be executed by proposer and submitted with the proposal I, ________________________________________ (name) hereby declare as follows: I am _________________________________ of ______________________________, (Title) (Company) the party making the foregoing proposal, that the proposal is not made in the interest of, or on behalf of, any undisclosed person, partnership, company, association, organization, or corporation; that the proposal is genuine and not collusive or sham; that the proposer has not directly or indirectly induced or solicited any other proposer to put in a false or sham proposal, and has not directly or indirectly colluded, conspired, connived, or agreed with any proposer or anyone else to put in a sham proposal, or that anyone shall refrain from proposing; that the proposer has not in any manner, directly or indirectly, sought by agreement, communication, or conference with anyone to fix the proposal price of the proposer or any other proposer, or to fix any overhead, profit, or cost element of the proposal price, or of that of any other proposer, or to secure any advantage against the public body awarding the agreement of anyone interested in the proposed agreement; that all statements contained in the proposal are true; and, further, that the proposer has not, directly or indirectly, submitted his or her proposal price or any breakdown thereof, or the contents thereof, or divulged information or data relative hereto, or paid, and will not pay, any fee to any corporation, partnership, company, association, organization, proposal depository, or to any member or agent thereof to effectuate a collusive or sham proposal. I declare under penalty of perjury under the laws of the State of California that the foregoing is true and correct. Proposer Signature: __________________________________________________ Proposer Name: __________________________________________________ Proposer Title: __________________________________________________ Company Name: __________________________________________________ Address: __________________________________________________ Jennifer J. Walker President/CEO Watearth, Inc. Jennifer J. Walker President/CEO Watearth, Inc. 1050 Ramon Road, Ste. 1 Palm Springs, CA 92264 Page 14 of 14 ATTACHMENT 4 ACKNOWLEDGEMENT OF RECEIPT OF ADDENDA Must be executed by proposer and submitted with the proposal; If no addenda has been issued, mark “N/A” under Addendum No. indicating Not Applicable and sign ADDENDUM NO. SIGNATURE INDICATING RECEIPT 1 2 Divider Page La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Appendix A - Resumes Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Jennifer J. Walker PE, DWRE, ENV SP, CFM, QSD, LEED AP BD+C Principal Civil Engineer Walker is a recognized expert in stormwater management, flood control, and sustainable infrastructure, with over 30 years of experience in hydrology, hydraulics, and water resources engineering. As president of Watearth, Inc., Walker has led municipal and regional stormwater projects, integrating hydraulic modeling, regulatory compliance, and stakeholder coordination to develop resilient and cost-effective infrastructure solutions. Walker has designed and implemented stormwater capture and infiltration systems across diverse environments, including the Nuview Union School District 100% Stormwater Infiltration & Drywell System Design, which incorporated porous asphalt, infiltration trenches, and vegetated buffers to achieve complete stormwater infiltration and evaporation. Expertise in Low Impact Development (LID) and green infrastructure is further demonstrated in the Fontana Unified School District Stormwater Infiltration & Percolation Enhancement Design, where LID-based stormwater management strategies, irrigation systems, and water conservation measures were developed. A trusted consultant for major agencies, including Los Angeles County, the Texas Water Development Board, the City of Houston, and Caltrans, Walker has overseen projects with construction costs exceeding $42 million. Leadership in the Adventure Park Retention Basin Infiltration & Stormwater Capture Project and the Harbor Park Stormwater Basin and Detention Feasibility Study highlights the ability to navigate complex hydrologic and environmental challenges, secure grant funding, and ensure permitting compliance. A leader in sustainable stormwater design, Walker specializes in balancing engineering feasibility, environmental preservation, and regulatory compliance. Experience in stormwater infiltration, drywell basin optimization, and flood mitigation ensures strong support for the City of La Quinta’s Miscellaneous Retention Basin Improvements Project, delivering on-budget, on- schedule solutions that enhance water quality and groundwater recharge. Education • MCE. Civil Engineering c. Water Resources. University of Houston. • BS. Civil Engineering c. Environmental and Water. Kansas State University. • Management Development for Entrepreneurs. UCLA Anderson School of Management. • Building a High-Performing Business. Tuck Executive Education at Dartmouth. Licenses & Certifications • PE. State of California. #C77079. • QSP/QSD. California Stormwater Quality Association. #21187. • ENV SP. Institute for Sustainable Infrastructure. • DWRE. American Academy of Water Resource Engineers. • CFM. Association of State Floodplain Managers (Texas Floodplain Management Association). #0848-05N. • LEED AP BD+C. US Green Building Council. #11511130 • Permaculture Designer's Certificate. Sustainable Development and Water. Permaculture Research Institute. Walker brings an exceptional ability to present the 30,000-foot view while staying attuned to the detailed nuances of the project. Mayor Parker City of Houston Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Representative Projects Los Angeles County Public Works (LACPW), Adventure Park Retention Basin Infiltration & Stormwater Capture Project (Los Angeles County, CA). This Caltrans-funded regional stormwater quality project included diversions from the San Gabriel River Watershed into a 19.5ac-ft underground stormwater capture facility. Watearth managed the project and performed civil design, permitting, Phase I and Phase II Environmental Site Assessments, groundwater monitoring and geotechnical studies (field testing of soils using the double ring infiltrometer method), field identification of plants and trees, development of a Water Quality Management Plan (WQMP), erosion and sediment controls, Operations & Maintenance (O&M) Plan for the Low Impact Development (LID), bioretention LID design (featuring native and low water use plants), development of interpretive signs, and stakeholder outreach. Permits included CA DFW, USACE Section 401 and Section 404, RWQCB, LACSD, and EPIC LA LACFD and Regional Planning Diversion. Included structural plan checks of underground infrastructure and controls building. Los Angeles County Public Works (LACPW), Harbor Park Stormwater Basin and Detention Feasibility Study (Los Angeles County, CA). The Harbor City Park Stormwater Capture Project is a multi-benefit initiative combining underground storage beneath recreational fields and above- ground Low Impact Development (LID). The project enhanced recreation and water quality for Machado Lake and Wilmington Drain by diverting runoff from multiple jurisdictions for infiltration or sewer diversion. The project includes restored baseball fields, additional trees, and nature- based LID. Fieldwork for biological resources, Phase I ESA, DRI, and geotechnical boreholes supported feasibility analysis, with permits secured for construction, monitoring, operations, and vector control planning. Los Angeles County Public Works (LACPW), Sorensen Park Stormwater Infiltration & Basin Optimization Study (Los Angeles County, CA). This stormwater capture project includes two types of stormwater capture, one in underground storage beneath existing recreational fields, and the other above-ground in the form of Low Impact Development (LID). The stormwater capture project will provide enhanced recreational benefits to residents near Sorensen Park along with water quality improvements downstream. This project will address the 19 requirements outlined in the Safe, Clean Water guidelines. Fontana Unified School District, Stormwater Infiltration & Percolation Enhancement Design (Fontana, CA). Designed and oversaw construction of stormwater infiltration (LID) features throughout three campus sites. Included recycled water reuse, LID modeling, landscape design and plant palettes, irrigation design, civil design, water conservation, O&M Plan, monitoring plan, cost estimates, interpretive signs and construction specifications, SWPPP, and WQMP. Incorporated water supply into design and specifications. Performed construction inspections of stormwater and LID features. Included ADA compliance. Provided grant administration and application assistance. Nuview Union School District, 100% Stormwater Infiltration & Drywell System Design (Riverside County, CA). The Nuview Elementary School Parking Lot Stormwater Infiltration Project showcases post-construction stormwater BMPs and Low Impact Development (LID) features at Nuview USD’s main campus. Partially funded by a California Proposition 84 grant, the project redeveloped a flood-prone school site, incorporating solar parking structures and a 100% stormwater infiltration porous asphalt lot. Key LID features include infiltration trenches, vegetated buffers, dust-blocking designs, and overflow elements. The project encompassed LID modeling, landscape and civil design, water conservation, O&M planning, interpretive signage, SWPPP, WQMP, and grant assistance. Additional efforts included cost-benefit analysis, flood risk management, and resilience-focused design modifications. Completed on schedule and within budget, the project also ensured ADA compliance and value engineering. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. LID-Based Stormwater Basin and Drainage Optimization Pilot. Project included the redevelopment of an existing roadway. Analyzed multiple LID tools in the EPA SWMM5.0.021 (hydrodynamic) model. Watearth developed a methodology to model tree boxes in EPA SWMM and successfully reduced peak flows below existing conditions using LID to mitigate additional pavement and increased conveyance impacts. Recommended LID features least likely to be disturbed by neighborhood redevelopment. Developed design details, specifications, life-cycle cost estimates, construction, O&M plans for selected LID tools, planting plans, and landscape architecture drawings. Developed configuration for water quality monitoring. Performed inspections. Performed stakeholder outreach and maintenance education. City of Santa Monica, BMPs O&M Manual (Santa Monica, CA). Performed NPDES and MS4 Permitting for TMDL compliance. Developed O&M Plan for City BMPs ranging from permeable pavement and LID BMPs to manufactured BMPs. Performed site reconnaissance of BMPs. Evaluated manufactured treatment systems and custom designed wet and dry weather stormwater treatment at SMURF facility, including filtering, ultraviolet disinfection, and other measures. Included customized O&M fact sheets and inspection sheets for all BMPs maintained by the City of Santa Monica. Watearth's manual was ultimately the criteria used by the City to hire a maintenance contractor. Los Angeles County Public Works (LACPW), UCLA-Olive View Medical Center Hydrology & Stormwater Permeability Study (Los Angeles, CA). The UCLA-Olive View Medical Center 230-acre redevelopment included new and refurbished buildings, expanded landscaping, and flood control integration with the LA River. Planned bioretention and permeable pavement aimed to reduce and treat stormwater runoff. A water supply assessment analyzed drip irrigation, drought- tolerant plants, and water-efficient fixtures. Watearth conducted continuous simulation and design storm modeling for green infrastructure, assessed erosion potential and floodplain impacts, and evaluated hydrology and water quality thresholds per NEPA/CEQA standards. Multi-Use Detention Basin & Stormwater Infiltration Standards Development. Coordinated with the City and other stakeholders to update the SWEPS technical paper. Included identifying habitat and mitigation recommendations. Lead City and stakeholder meetings. Updated information for a variety of hydrology, hydraulic, and habitat/vector considerations. Revised paper for new and retrofit Capital Improvement Projects. Purpose of paper is to inform the City of considerations and approaches for incorporating multi-use features such as parks into different types of detention basins. Law Offices of James A. Martinez, Flood Control Basin Failure & Infiltration Performance Review. Provided third party review engineering services of a failed stormwater detention pond. The project included reviewing approved design and as-built drawings, drainage design calculations, HEC-HMS and HEC-RAS models, soils data, steep slope factors, and other similar design data provided by the client. The review entailed verifying if appropriate design factors were used such as hydrologic inputs into modeling software, verifying appropriate details used for design storms, verifying infiltration calculations of the basin/dry well, and verifying appropriate delineation of the watershed, among others. Deliverables include a technical memorandum that led to the client recovering fees. Supplied project management and technical memorandum. Provided sediment yield calculations. City of Citrus Heights, O&M Updates and Staff Training (Citrus Heights, CA). Provided O&M training to city staff, developed training materials and recorded training for future use. Developed updates to O&M inspection documents and created LID educational flyer. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do not Copy. Jeremy Liby GIS Senior Project Manager Jeremy Liby is a project manager and environmental scientist with over 14 years of expertise in GIS analysis, stormwater infrastructure planning, and project management. His background in hydrologic assessments, data collection, and regulatory documentation ensures that stormwater and drainage projects are executed efficiently, accurately, and in compliance with appropriate regulations. Liby has led GIS-driven hydrologic assessments and environmental site evaluations for stormwater capture and drainage improvement projects. Liby managed the Harbor Park Stormwater Capture Basin & Infiltration Project, where he oversaw field data collection, technical reporting, and GIS mapping to support hydrology modeling and regulatory compliance. He also contributed to stormwater capture feasibility studies at Adventure Park Park and Sorensen Park, managing spatial analysis tools to optimize drainage layouts and improve stormwater infiltration. His expertise in technical writing, GIS integration, and storm drain inventory management has supported flood control and infrastructure planning efforts, as demonstrated in the Rubio Wash Watershed Drainage & Hydrology Improvement Study, where he helped develop watershed models, subarea breakup maps, and GIS-based drainage analyses. Additionally, his work on the Storm Drainage & Infrastructure Improvement Study highlights his ability to translate field data into actionable design insights for municipal infrastructure improvements. With a strong foundation in stormwater basins, hydrology, and technical reporting, Liby is well- equipped to support the City of La Quinta’s Miscellaneous Retention Basin Improvements Project by providing expertise in hydrologic assessments, drainage mapping, and regulatory compliance to enhance retention basin functionality and stormwater management efficiency. Education • BS. Geology. University of Colorado. Licenses & Certifications • GIS Certificate. University of Denver. • First Aid/CPR-AED. National Safety Council (NSC). Representative Projects Los Angeles County Public Works (LACPW), Adventure Park Retention Basin Infiltration & Stormwater Capture Project (Los Angeles County, CA). This Caltrans-funded regional stormwater quality project included diversions from the San Gabriel River Watershed into a 19.5ac-ft underground stormwater capture facility. Watearth managed the project and performed civil design, permitting, Phase I and Phase II Environmental Site Assessments, groundwater monitoring and geotechnical studies (field testing of soils using the double ring infiltrometer method), field identification of plants and trees, development of a Water Quality Management Plan (WQMP), erosion and sediment controls, Operations & Maintenance (O&M) Plan for the Low Impact Development (LID), bioretention LID design (featuring native and low water use plants), I have really enjoyed the great diversity in workload this career provides. It feels good knowing I am making a positive difference in the world. Whether it is pointing out environmentally significant items or improving a drainage system for a town, the impact is important for society. Jeremy Liby GIS Watearth Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do not Copy. development of interpretive signs, and stakeholder outreach. Permits included CA DFW, USACE Section 401 and Section 404, RWQCB, LACSD, and EPIC LA LACFD and Regional Planning Diversion. Included structural plan checks of underground infrastructure and controls building. Los Angeles County Public Works (LACPW), Harbor Park Stormwater Basin and Detention Feasibility Study (Los Angeles County, CA). The Harbor City Park Stormwater Capture Project is a multi-benefit initiative combining underground storage beneath recreational fields and above- ground Low Impact Development (LID). The project enhanced recreation and water quality for Machado Lake and Wilmington Drain by diverting runoff from multiple jurisdictions for infiltration or sewer diversion. The project includes restored baseball fields, additional trees, and nature- based LID. Fieldwork for biological resources, Phase I ESA, DRI, and geotechnical boreholes supported feasibility analysis, with permits secured for construction, monitoring, operations, and vector control planning. Los Angeles County Public Works (LACPW), Sorensen Park Stormwater Infiltration & Basin Optimization Study (Los Angeles County, CA). This stormwater capture project includes two types of stormwater capture, one in underground storage beneath existing recreational fields, and the other above-ground in the form of Low Impact Development (LID). The stormwater capture project will provide enhanced recreational benefits to residents near Sorensen Park along with water quality improvements downstream. This project will address the 19 requirements outlined in the Safe, Clean Water guidelines. Rancho Palos Verdes, Storm Drainage & Infrastructure Improvement Study (Rancho Palos Verdes, CA). Conducted site investigation and data collection for high-priority sidewalk repairs. Developed cost-saving field plan and performed detailed surveys. Prepared technical memorandum with recommendations and feasibility assessments. Ensured ADA compliance. Provided evidence for City Engineering staff to secure City Council approval for Phase 2 design solutions. Los Angeles County Public Works (LACPW), Rubio Wash Watershed Drainage & Hydrology Improvement Study (Los Angeles, CA). Watearth conducted hydrology and 1D/2D hydraulics for the Rubio Wash drainage study, a key flood control system in Los Angeles fed by 800+ inlets. Due to non-compliance with Flood Control District policies, a baseline watershed model was developed to identify deficiencies. The project included a GIS inventory of storm drains, assessing facility dimensions, slopes, elevations, and alignments. Hydrologic analysis used the Modified Rational Method (MODRAT) with subarea breakup maps, while 1D/2D hydraulic modeling in XPSWMM evaluated 10-, 25-, and 50-year storm events. City of Santa Rosa, South Santa Rosa Specific Plan Infrastructure Plan (Santa Rosa, CA). Evaluation of existing and proposed water and wastewater systems. Site reconnaissance, technical memorandums, watershed maps, hydrology calculations, stormwater management, flood mitigation, and conceptual improvements for future growth. City of Calabasas, Las Virgenes Creek Stabilization & Flood Control Restoration Project (Calabasas, CA). For this PS&E Phase III design project, Watearth addressed erosion and habitat damage from the Woolsey Fires and storms, stabilizing creek banks, extending trails, and ensuring CDFW compliance. Work included rip rap repairs at 26 outlets, extending the lower trail 2,500 feet, and developing slope protection and erosion control plans. The team prepared CEQA IS/MND and NEPA EA, developed an MMRP, and secured regulatory permits. Watearth facilitated City staff workshops at 30% and 60% design, presented updates to the Calabasas City Council, and delivered PS&E bid documents, including plans, specifications, and cost estimates. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do not Copy. Jacob Guise Deputy Project Manager Guise is a water resources engineer and project manager with expertise in stormwater management, hydrology, and environmental compliance. His experience leading municipal drainage and stormwater quality improvement projects positions him as a key asset for the City of La Quinta’s Miscellaneous Retention Basin Improvements Project. He specializes ensuring projects are cost effective, on budget and meet local, state, and federal stormwater management standards. Guise assisted in managing the Adventure Park Retention Basin Infiltration & Stormwater Capture Project, overseeing regional stormwater capture and drainage improvements. Guise helped manage groundwater monitoring, geotechnical assessments using the double-ring infiltrometer method, a Water Quality Management Plan (WQMP), and designed erosion control measures— all critical components for optimizing retention basin percolation and drainage performance. His work on the Pilot Point Hydrology Study further demonstrates his ability to manage hydrology studies, site assessments, and compliance reporting to inform municipal infrastructure decisions. His combined expertise in hydrology, stormwater management, and environmental engineering makes him well-suited to support the City of La Quinta’s retention basin improvements by providing innovative, cost-effective drainage solutions that enhance percolation, mitigate standing water issues, and comply with agency requirements. Education • BS. Environmental Engineering c. Biological and Chemical Processes. University of Delaware. Representative Projects Los Angeles County Public Works (LACPW), Adventure Park Retention Basin Infiltration & Stormwater Capture Project (Los Angeles County, CA). This Caltrans-funded stormwater quality project diverted flows from the San Gabriel River Watershed into a 19.5-acre-foot underground stormwater capture facility. Watearth managed civil design, permitting, environmental site assessments, groundwater monitoring, and geotechnical studies. The project included WQMP development, erosion control, bioretention LID design, O&M planning, and stakeholder outreach. Permits were secured from CA DFW, USACE, RWQCB, LACSD, and LACFD, with structural plan checks for underground infrastructure and controls. Rancho Palos Verdes, Storm Drainage & Infrastructure Improvement Study (Rancho Palos Verdes, CA). Conducted site investigation and data collection for high-priority sidewalk repairs. Developed cost-saving field plan and performed detailed surveys. Prepared technical memorandum with recommendations and feasibility assessments. Ensured ADA compliance. Provided evidence for City staff to secure City Council approval for Phase 2 design solutions. City of Santa Rosa, South Santa Rosa Specific Plan Infrastructure Plan (Santa Rosa, CA). Evaluation of existing and proposed water and wastewater systems. Site reconnaissance, technical memorandums, watershed maps, hydrology calculations, stormwater management, flood mitigation, and conceptual improvements for future growth. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Brian Meade Senior Designer Brian Meade is a highly experienced civil designer with over 39 years of expertise in grading, drainage system design, and retention basin infrastructure. His background in surveying, CAD modeling, and hydrology-driven site planning allows him to develop accurate and efficient stormwater solutions that enhance percolation, mitigate standing water, and ensure regulatory compliance. Meade has been instrumental in large-scale stormwater capture and urban runoff projects, including the Adventure Park Retention Basin Infiltration & Stormwater Capture Project, where he led detailed CAD modeling, grading design, and drainage system layouts for a 19.5-acre-foot underground stormwater facility. His expertise also supported the Harbor Park Stormwater Basin and Detention Feasibility Study, where he optimized infiltration designs, coordinated Low Impact Development (LID) integration, and provided topographic analysis for feasibility assessments. His surveying and terrain visualization skills ensure precise, constructible designs, as demonstrated in the Storm Drainage & Infrastructure Improvement Study, where he conducted site investigations and feasibility studies to support municipal infrastructure improvements. Meade’s role in construction-phase coordination and regulatory compliance on multi-million- dollar stormwater projects highlights his ability to streamline project execution and ensure successful implementation. With a strong foundation in hydrology, stormwater infrastructure, and regulatory planning, Meade is well-equipped to support the City of La Quinta’s Miscellaneous Retention Basin Improvements Project by delivering efficient, sustainable drainage solutions that enhance basin functionality and long-term performance. Education • AS. Mechanical Design & Drafting, State University of New York at Alfred, Alfred, New York Representative Projects Los Angeles County Public Works (LACPW), Adventure Park Retention Basin Infiltration & Stormwater Capture Project (Los Angeles County, CA). This Caltrans-funded regional stormwater project diverted flows from the San Gabriel River Watershed into a 19.5-acre-foot underground stormwater capture facility. Watearth managed civil design, permitting, Phase I & II Environmental Site Assessments, groundwater monitoring, and geotechnical studies (including double ring infiltrometer testing). Developed a Water Quality Management Plan (WQMP), erosion and sediment controls, O&M Plan for LID features, and bioretention LID design with native, low-water-use plants. Provided interpretive signage and stakeholder outreach. Secured permits from CA DFW, USACE, RWQCB, LACSD, and EPIC LA LACFD. Conducted structural plan checks for underground infrastructure and the controls building. Los Angeles County Public Works (LACPW), Harbor Park Stormwater Basin and Detention Feasibility Study (Los Angeles County, CA). The Harbor City Park Stormwater Capture Project is a multi-benefit initiative integrating underground storage beneath recreational fields and above- My schooling taught me to be flexible and think outside the box for solutions. Being flexible has been my key to my profession. Brian Meade Watearth Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. ground Low Impact Development (LID). It enhances water quality in Machado Lake and Wilmington Drain while providing recreational benefits like restored baseball fields, additional trees, and green infrastructure. The project captures urban and stormwater runoff for infiltration or sewer diversion. Fieldwork included biological assessments, Phase I ESA, DRI, and geotechnical boreholes to support feasibility. Permits were obtained, and plans for monitoring, operations, and vector controls were developed. Los Angeles County Public Works (LACPW), Sorensen Park Stormwater Infiltration & Basin Optimization Study (Los Angeles County, CA). This stormwater capture project includes two types of stormwater capture, one in underground storage beneath existing recreational fields, and the other above-ground in the form of Low Impact Development (LID). The stormwater capture project will provide enhanced recreational benefits to residents near Sorensen Park along with water quality improvements downstream. This project will address the 19 requirements outlined in the Safe, Clean Water guidelines. Rancho Palos Verdes, Storm Drainage & Infrastructure Improvement Study (Rancho Palos Verdes, CA). Conducted site investigation and data collection for high-priority sidewalk repairs. Developed cost-saving field plan and performed detailed surveys. Prepared technical memorandum with recommendations and feasibility assessments. Ensured ADA compliance. Provided evidence for City Engineering staff to secure City Council approval for Phase 2 design solutions. City of Calabasas, Las Virgenes Creek Stabilization & Flood Control Restoration Project (Calabasas, CA). For this PS&E Phase III design project, Watearth addressed erosion and habitat damage from the Woolsey Fires and storms, stabilizing creek banks, extending trails, and ensuring CDFW compliance. Work included rip rap repairs at 26 outlets, extending the lower trail 2,500 feet, and developing slope protection and erosion control plans. The team prepared CEQA IS/MND and NEPA EA, developed an MMRP, and secured regulatory permits. Watearth facilitated City staff workshops at 30% and 60% design, presented updates to the Calabasas City Council, and delivered PS&E bid documents, including plans, specifications, and cost estimates. Taylor-Slough Watershed Modeling and Stormwater Control Measure Retrofits including Reed Park. Conducted desktop evaluation of floodplains, soils, infiltration rates, topography, land use, aerial imagery, utilities, and impervious cover within the watershed. Performed site reconnaissance at Reed Park to assess hydrology, erosion, drainage patterns, mature tree canopy (including protected Spanish Oaks), and recreational features. Developed three GIS- based alternatives and 30% design documents. Utilized EPA SWMM for hydrologic, hydraulic, and water quality modeling, including TCEQ Surface Water Quality Regulations. Ensured compliance with Drainage and Environmental Criteria Manuals, provided O&M planning, stream functional assessment, cost-benefit analysis, landscape design, erosion control vegetation, and stable channel bottom design. Tannehill Creek Morris Williams Stormwater Improvements and Bartholomew Park Stormwater Treatment Retrofit. Conducted desktop infiltration study for proposed Stormwater Control Measures (SCMs) at a park and golf course, analyzing hydrologic soils group, soil textures, and groundwater data per City of Austin's Environmental Criteria Manual (ECM). Recommended and oversaw geotechnical sampling and monitoring for SCMs designed to improve water quality and mitigate flooding. Evaluated field and lab infiltration studies, performed riparian functional assessment, and developed 30% stream restoration design at critical erosion sites. Prepared cost estimates, Preliminary Engineering Report (PER), and stakeholder outreach. Ensured compliance with TCEQ Surface Water Quality Regulations. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Mark Alan Locke PE QA/QC Mark Locke is a senior engineer with over 40 years of experience specializing in stormwater infrastructure, flood control, and basin design. His expertise in stormwater infiltration, runoff diversion, and water quality improvements has been instrumental in projects requiring hydrologic analysis, flood mitigation, and regulatory compliance. Locke has worked extensively with USDA NRCS and USACE, bringing multi- agency coordination experience to municipal and regional water infrastructure projects. From 2012 to 2019, Locke served with the U.S. Army Corps of Engineers (USACE) as a Dam Safety Program Manager, Deputy Director, and Chief, overseeing stormwater retention, flood mitigation, and environmental compliance efforts. His leadership in stormwater capture initiatives, such as the Adventure Park Retention Basin Infiltration & Stormwater Capture Project, highlights his ability to manage infiltration system design, environmental permitting, and hydrologic assessments. Locke has also contributed to regional stormwater capture and infiltration projects, including Harbor Park and Sorensen Park, where he integrated underground retention systems, bioretention LID, and vector control planning to enhance water quality and flood resilience. His role in the Rubio Wash Hydrology and 1D/2D Hydraulics Drainage Study further demonstrates his expertise in hydrologic modeling, stormwater conveyance, and infrastructure analysis. Locke delivers cost-effective and site-specific stormwater solutions that balance hydrologic performance, habitat restoration, and regulatory requirements. His extensive background makes him well-equipped to support the City of La Quinta’s Miscellaneous Retention Basin Improvements Project, ensuring efficient stormwater diversion, treatment, and long-term infrastructure sustainability Education • BS. Agricultural Engineering. Kansas State University. • Graduate Course. Structure and Slope Stability. Kansas State University. Licenses & Certifications • PE. State of Kansas. #9758. • Member - Society of American Military Engineers • Member – National Society of Professional Engineers • Member - Association of State Dam Safety Officials • Member – American Society of Agricultural and Biological Engineers (ASABE) Representative Experience Los Angeles County Public Works (LACPW), Adventure Park Retention Basin Infiltration & Stormwater Capture Project (Los Angeles County, CA). This Caltrans-funded regional stormwater quality project included diversions from the San Gabriel River Watershed into a 19.5ac-ft I saw engineering as an opportunity to take my individual skills to use for the betterment of individuals, the environment, and society as a whole. There is nothing better than helping to solve an individual’s problem, saving a community from flooding, or creating a solution to help sustain the environment. Mark Alan Locke PE Watearth Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. underground stormwater capture facility. Watearth managed the project and performed civil design, permitting, Phase I and Phase II Environmental Site Assessments, groundwater monitoring and geotechnical studies (field testing of soils using the double ring infiltrometer method), field identification of plants and trees, development of a Water Quality Management Plan (WQMP), erosion and sediment controls, Operations & Maintenance (O&M) Plan for the Low Impact Development (LID), bioretention LID design (featuring native and low water use plants), development of interpretive signs, and stakeholder outreach. Permits included CA DFW, USACE Section 401 and Section 404, RWQCB, LACSD, and EPIC LA LACFD and Regional Planning Diversion. Included structural plan checks of underground infrastructure and controls building. Los Angeles County Public Works (LACPW), Harbor Park Stormwater Basin and Detention Feasibility Study (Los Angeles County, CA). The Harbor City Park Stormwater Capture Project is a multi-benefit stormwater capture project planned within Harbor City Park. The project includes two types of stormwater capture, one in underground storage beneath existing recreational fields, and the other above-ground in the form of Low Impact Development (LID). The stormwater capture project will provide enhanced recreational benefits to residents near Harbor City Park along with water quality improvements to Machado Lake and Wilmington Drain. The project will divert urban and stormwater runoff from multiple jurisdictions into storage for infiltration or diversion to sewer via force main. The project will include above ground amenities such as restored baseball fields, additional trees, and nature based low impact development. Field work for biological resources, a phase I ESA, DRI, and geotechnical boreholes occurred to assist in the development of the feasibility study. Permits were obtained for construction and plans for monitoring, operations, and vector controls were developed to support the project. Los Angeles County Public Works (LACPW), Sorensen Park Stormwater Infiltration & Basin Optimization Study (Los Angeles County, CA). This stormwater capture project includes two types of stormwater capture, one in underground storage beneath existing recreational fields, and the other above-ground in the form of Low Impact Development (LID). The stormwater capture project will provide enhanced recreational benefits to residents near Sorensen Park along with water quality improvements downstream. This project will address the 19 requirements outlined in the Safe, Clean Water guidelines. Los Angeles County Public Works (LACPW), Rubio Wash Watershed Drainage & Hydrology Improvement Study (Los Angeles, CA). Watearth conducted hydrology and 1D/2D hydraulics for the Rubio Wash drainage study, a key flood control system in Los Angeles fed by 800+ inlets. Due to non-compliance with Flood Control District policies, a baseline watershed model was developed to identify deficiencies. The project included a GIS inventory of storm drains, assessing facility dimensions, slopes, elevations, and alignments. Hydrologic analysis used the Modified Rational Method (MODRAT) with subarea breakup maps, while 1D/2D hydraulic modeling in XPSWMM evaluated 10-, 25-, and 50-year storm events. City of Citrus Heights, Stormwater Infrastructure O&M Training & Inspection Program (Citrus Heights, CA). Provided O&M training to city staff, developed training materials and recorded training for future use. Developed updates to O&M inspection documents and created LID educational flyer. Rancho Palos Verdes, Storm Drainage & Infrastructure Improvement Study (Rancho Palos Verdes, CA). Conducted site investigation and data collection for high-priority sidewalk repairs. Developed cost-saving field plan and performed detailed surveys. Prepared technical memorandum with recommendations and feasibility assessments. Ensured ADA compliance. Provided evidence for City Engineering staff to secure City Council approval for Phase 2 design solutions. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Carlos Quispe MS Design Engineer Quispe is a highly skilled design engineer with over 19 years of experience in hydrology and hydraulics, civil design, GIS-based stormwater modeling, and drainage system analysis. His expertise includes 1D and 2D hydraulic modeling, stormwater infrastructure design, and Low Impact Development (LID) integration, making him a strong contributor to regional flood mitigation and stormwater management projects. Quispe is an expert in hydrologic and hydraulic modeling, proficient in HEC-HMS, HEC-RAS, XPSWMM, and Infowater, and has GIS experience, including developing, maintaining, and updating hydraulic models, watershed maps, and pipeline networks. He has performed stormwater feasibility studies, permitting support, and QA/QC analysis for projects across California and beyond. His background includes fieldwork, GPS data collection, and geotechnical assessments for infiltration and flood control projects. Quispe has led stormwater infiltration and flood control studies, including the Adventure Park, Harbor Park, and Sorensen Park stormwater capture projects, where he developed hydrologic models, evaluated stormwater impacts, and proposed mitigation strategies. His expertise in stormwater quality management, erosion control, and compliance with CEQA, NEPA, and local drainage regulations ensures successful project execution. Education • MS. Water Resources Engineering. California State University Sacramento, CA. • BA. Mechanic of Fluids Engineering (Hydraulic-Hydrology). University National Mayor San Marcos – Lima, Peru. • Associate of Science Degree in Geographic Information Systems (GIS). American River College Sacramento, CA. Representative Projects Los Angeles County Public Works (LACPW), Adventure Park Retention Basin Infiltration & Stormwater Capture Project (Los Angeles County, CA). This Caltrans-funded regional stormwater quality project included diversions from the San Gabriel River Watershed into a 19.5ac-ft underground stormwater capture facility. Watearth managed the project and performed civil design, permitting, Phase I and Phase II Environmental Site Assessments, groundwater monitoring and geotechnical studies (field testing of soils using the double ring infiltrometer method), field identification of plants and trees, development of a Water Quality Management Plan (WQMP), erosion and sediment controls, Operations & Maintenance (O&M) Plan for the Low Impact Development (LID), bioretention LID design (featuring native and low water use plants), development of interpretive signs, and stakeholder outreach. Permits included CA DFW, USACE Section 401 and Section 404, RWQCB, LACSD, and EPIC LA LACFD and Regional Planning Diversion. Included structural plan checks of underground infrastructure and controls building. Los Angeles County Public Works (LACPW), Harbor Park Stormwater Basin and Detention Feasibility Study (Los Angeles County, CA). The Harbor City Park Stormwater Capture Project is a multi-benefit stormwater capture project planned within Harbor City Park. The project includes two types of stormwater capture, one in underground storage beneath existing recreational fields, and the other above-ground in the form of Low Impact Development (LID). The stormwater capture project will provide enhanced recreational benefits to residents near Harbor City Park along with water quality improvements to Machado Lake and Wilmington Drain. The Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. project will divert urban and stormwater runoff from multiple jurisdictions into storage for infiltration or diversion to sewer via force main. The project will include above ground amenities such as restored baseball fields, additional trees, and nature based low impact development. Field work for biological resources, a phase I ESA, DRI, and geotechnical boreholes occurred to assist in the development of the feasibility study. Permits were obtained for construction and plans for monitoring, operations, and vector controls were developed to support the project. Los Angeles County Public Works (LACPW), Sorensen Park Stormwater Infiltration & Basin Optimization Study (Los Angeles County, CA). This stormwater capture project includes two types of stormwater capture, one in underground storage beneath existing recreational fields, and the other above-ground in the form of Low Impact Development (LID). The stormwater capture project will provide enhanced recreational benefits to residents near Sorensen Park along with water quality improvements downstream. This project will address the 19 requirements outlined in the Safe, Clean Water guidelines. Los Angeles County Public Works (LACPW), Rubio Wash Watershed Drainage & Hydrology Improvement Study (Los Angeles, CA). Watearth provided hydrology and 1D/2D hydraulics for the Rubio Wash subwatershed drainage study. Rubio Wash is an essential component of the flood control system in Los Angeles and is fed by roughly 800 inlets and other sources. Because the drainage system did not meet the Flood Control District's drainage policy, a comprehensive baseline model of the watershed was needed to identify locations of existing deficiencies within the Watershed and along the reach of the Channel. This project involved a major GIS inventory of storm drains and networks, including drainage facility dimensions, material, type, length, slope, upstream and downstream invert elevations, alignment, and as-built plan source. Hydrology included Modified Rational method (MODRAT) and the development of subarea breakup maps (drainage area maps). Hydraulics utilized 1D and 2D modeling in XPSWMM at the 10-, 25-, and 50-year design storm events. City of Santa Rosa, South Santa Rosa Specific Plan Infrastructure Plan. Evaluation of existing and proposed water and wastewater systems. Site reconnaissance, technical memorandums, watershed maps, hydrology calculations, stormwater management, flood mitigation, and conceptual improvements for future growth. Sonoma County Transportation Authority, Project Approval and Environmental Document Services for State Route 121 / 8th Street East Intersection Improvements. Performed due diligence, CEQA hydrology and water quality technical studies, location hydraulic study, and water quality assessment for SR 121 / 8th Street East Intersection Improvements. Developed hydrologic models, evaluated stormwater impacts, and proposed mitigation strategies. Prepared detailed technical documentation and ensured compliance with regulatory standards. Sacramento Suburban Water District, Hydraulic Analysis of New Transmission Main Prioritization (Sacramento, CA). Developed and maintained district models using Infowater and WaterCAD. Water System Hydraulic Modeling. Included fire flow, flow and pressure control analysis, and pipeline maintenance plan. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Shawn Khazey Civil Engineer Khazey is a civil engineer with expertise in stormwater management, drainage design, and environmental restoration. His experience in hydrology, hydraulics, and flood control allows him to develop effective percolation and drainage solutions that align with municipal and environmental regulations. With a focus on erosion control, drywell system design, and stormwater infiltration, Khazey ensures infrastructure improvements are both functional and sustainable. Khazey has worked on stormwater infrastructure and restoration projects, such as the Las Virgenes Creek Stabilization & Flood Control Restoration Project, where he contributed to creek bank stabilization, slope protection, and erosion control following storm damage. He also played a key role in regulatory compliance, PS&E development, and habitat restoration, demonstrating their ability to integrate stormwater and environmental design considerations. In municipal drainage projects, Khazey has provided technical studies and stormwater impact analysis, as seen in the City of Napa Stormwater Drainage & Water Quality Compliance Study for Intersection Improvements, where he conducted drainage memoranda, flood assessments, and permitting compliance for Caltrans, CEQA, and NEPA approvals. His proficiency in AutoCAD Civil 3D, HydroCAD, and hydrologic modeling allows him to develop precise engineering designs for complex drainage and percolation challenges. With experience in stormwater system optimization and environmental compliance, Khazey is well-equipped to support the City of La Quinta’s Miscellaneous Retention Basin Improvements Project, providing expertise in improving basin functionality, enhancing percolation, and ensuring long-term stormwater management efficiency. Education • BS. Civil and Environmental Engineering. University of Wisconsin – Platteville. Representative Projects City of Napa, Project Approval and Environmental Document for Intersection Improvements at Five-Way Intersection (Napa, CA). Conducted technical studies for Napa 5-Way Intersection improvements. Provided value analysis support, drainage memorandum, water quality technical study, and SWDR. Prepared Phase I Initial Site Assessment, ensuring compliance with Caltrans, CEQA, and NEPA standards. Delivered detailed technical documentation and recommendations for stormwater management and environmental compliance. City of Calabasas, Las Virgenes Creek Stabilization & Flood Control Restoration Project (Calabasas, CA). Watearth led PS&E Phase III design to address erosion and habitat damage from the Woolsey Fires and storm events. The project included creek bank stabilization, rip rap installation at 26 outlets, and a 2,500-foot trail extension, ensuring CDFW compliance. Work also covered slope protection, erosion control, and detailed construction plans. The team prepared CEQA IS/MND, NEPA EA, and a Mitigation Monitoring and Reporting Program (MMRP), securing regulatory permits. Coordination included City staff workshops and City Council presentations at 30%, 60%, and final design stages, culminating in construction bid documents, plans, and cost estimates. Resume La Quinta Retention Basin Improvements Keeping Drywells Dry and Well. © Watearth, Inc. 2025. Do Not Copy. Carlos V. Amante PE, GE Terracon Senior Project Manager Amante will serve as Terracon’s Senior Project Manager and be the City’s primary point of contact. Amante has over 29 years of geotechnical and earthquake engineering consulting and project management experience in southern California. Carlos is highly experienced in the management and technical delivery of design and construction projects involving complex ground investigation, seismic-resilient design of earthworks and foundations, slope engineering, liquefaction assessment, constructability/value engineering study, construction quality management, and materials testing and special inspection services. Education • MASc. Geotechnical Engineering. University of British Columbia, Canada. • ME. Earthquake Engineering. Kanazawa University, Japan. • BS. Civil Engineering. University of the Phillippines, Metro Manila. Licenses & Certifications • Registered Geotechnical Engineer. State of California. #GE 2724. • Registered Civil Engineer. State of California. #C57831. Representative Projects Bicycle and Pedestrian Facilities, Sixth Street Viaduct Replacement Project, Los Angeles, CA. Geotechnical investigation for proposed street pavement improvements on Mission Road, Jesse Street and Myers Road and installation of underground fiberglass-reinforced polymer (FRP) water silos with a nominal diameter of 12 feet and height of up to 60 feet. Ocean View Boulevard Slope Repair Project, (PS&E and CQA), La Cañada- Flintridge, CA. Geotechnical investigation, preparation of geotechnical design report providing recommendations for slope reconstruction and repair of retaining walls, and preparation of plans and technical specifications. First Street Viaduct over Glendale Boulevard (PS&E), Los Angeles, CA. Geotechnical investigation, preparation of Final Bridge Foundation Report, review of plans and technical specifications. Alameda Corridor-East Grade Separation Projects at Baldwin Avenue, Nogales Street and Brea Canyon Road (PS&E), Los Angeles County, CA. Geotechnical investigation for proposed railroad bridges over existing roadways, retaining walls, and pump stations at four grade separation projects. City of La Habra Heights Pavement Rehabilitation (PS&E), La Habra Heights, CA. Pavement design services for the rehabilitation of select residential streets within the City, including pavement coring. City of Placentia Residential Street Rehabilitation (PS&E), Placentia, CA. Pavement design services for the rehabilitation of select residential streets within the City of Placentia, including pavement coring.