2019-10-08 - Stockstill, Ray question re drainageFrom:
Ray Stockstill <scnbeach@earthlink.net>
Sent:
Tuesday, October 8, 2019 12:52 PM
To:
Amy Yu
Cc:
AJ Ortega
Subject:
FW: question from Ray Stockstill
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Figure 1 — From 0" to 4 " in this picture is the foundation. There is a black aluminum angle or flange protecting
the surface of the foundation.
i
Figure 2 — The side of the foundation below the flange has stucco covering it. Some amount of rainwater will
pool in the courtyard during a 100 year storm. That pooled rainwater has a surface water elevation. Rainwater
will be in contact with the foundation during almost any rain event. The freeboard requirement in the front of the
house is independent to this situation. On September 8, 2014 rainwater entered the home from the courtyard.
Based on the lack of flood debris, it didn't look like the flood elevation made it to my grass. The freeboard from
the front yard did not protect the pad from the exposure in the courtyard.
Figure 3 — I wasn't in La Quinta during the event. I met an ER contractor the following morning at the home.
This was taken upon arrival. There is nothing to suggest that the water breached the street and got up onto my
lawn.
4
Figure 4 — This is how we found the only drain grate in the courtyard when we entered it the morning after the
event. The question we have is whether including a freeboard requirement in our new design is good
engineering practice or is it unnecessary?
Figure 5 — The pool was clean so there was no flooding in the backyard. We are past all these issues and
down to whether it is good engineering practice to include freeboard in the new drainage system's design.
Thank you for your assistance with this.
Ray Stockstill
949-622-90232
From: Amy Yu [mailto:Ayu@laquintaca.gov]
Sent: Monday, October 07, 2019 2:03 PM
To: Ray Stockstill
Cc: A] Ortega
Subject: RE: question from Ray Stockstill
Hi Ray,
Yes, Multi -unit Family PUD typically requires onsite retention and has parking lots similar to a commercial
project.
Sincerely,
4Q"«1a
— CALIFORNIA
Amy Yu I Associate Engineer
Design and Development
City of La Quinta
78495 Calle Tampico - La
Ph. 760.777.7047
www.laquintaca._ov
www.playinlaquinta.com
From: Ray Stockstill <scnbeach@earthlink.net>
Sent: Monday, October 07, 2019 5:30 AM
To: AJ Ortega <Aortega@laquintaca.gov>
Cc: Amy Yu <Ayu@laquintaca.gov>
Subject: question from Ray Stockstill
AJ ,
Quinta, CA 92253
The applicable precise grading plan checklist for my home in La Quinta is City of La Quinta Public Works
Department - Commercial Precise Grading Plan Review Checklist (Includes Multi -Unit Family PUD Precise
Grading). The precise grading plan checklist also references specific Engineering Bulletins and the City of La
Quinta Public Works Department - Storm Drain Plan Review Checklist. I assume all apply to both commercial
developments and PUDs. They use the term "pad". I know that a "pad" is the top on the foundation. I assume
"pad" can be an individual commercial building's pad or an individual home's pad. I have a curiosity question.
Why did the City lump commercial developments and PUDs into a single precise grading plan checklist? Was it
because the City requires both new commercial projects and new PUDs to manage storm water onsite using
onsite retention basins?
Thanks.
Ray Stockstill