HomeMy WebLinkAboutCUP 2020-0003; RECYCLED WATER PHASE III D-4; ADDENDUM 2 - CLARIFICATION ON DRAINAGE GRADIENT REQUIREMENTS FOR THE PAVED ROAD LOCATED NEAR THE PROPOSED WATER TANK; 2022-03-22NV S
Carlsbad Municipal Water District
5950 El Camino Real
March 22, 2022
Project Number 226816-000011.00
Carlsbad, California 92009-8802
Attention :
Project:
Mr. Dave Padilla
Recycled Water Phase Ill: D-4 Reservoir
Carlsbad Municipal Water District
Carlsbad, California
RE EIVE
OCT 18 2022
LAND DEVELOPMENT
E= IGI EERING
Subject: Addendum No. 2 -Clarification on Drainage Gradient Requirements for the Paved Road
Located near the Proposed Water Tank. ·
References: "Addendum No. 1 -Revised Remove and Recompaction Recommendations, Recycled
Water Phase Ill: 0 -4 Reservoir, Carlsbad Municipal Water District,Carlsbad, California",
prepared by NV5 West, Inc. (NV5), dated May 25, 2021
Dear Mr. Padilla,
Introduction
"Geotechnical Investigation Report, Carlsbad Municipal Water District, Phase Ill Recycled
Water Project, Carlsbad, California", prepared by NV5 West, Inc. (NV5), dated April 24,
2019
Civil Plan Sheet C-01, "Improvement Plans for: Recycled Water Phase Ill: D-4 Reservoir,
Tank Site Grading", 100% Submittal (Not for construction), prepared by NV5
As requested, this 2nd letter addendum provides NV5 West, Inc. (NV5) clarification on gradient requirements
for the proposed paved road located near the proposed water ta.nk for the subject project. Reference is made
to the original geotechnical report (dated April 24, 2019) and first letter addendum (dated May 25, 2021)
prepared for the project. Reference is also made to the civil plan Sheet C-01 prepared for the project.
Discussion
In Appendix C, Typical Earthwork Guidelines, Section 8.3 of the referenced geotechnical report the following
guidelines were presented regarding drainage gradient.
• Surface drainage on the site shall be provided so that water is not permitted to pond. A gradient of 2
percent or steeper shall be maintained over the pad area and drainage patterns shall be established
to remove water from the site to an appropriate outlet.
OFFICES llATIOlll~DE
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Addendum No. 2 -Clarification on Drainage Gradient Requirements
Recycled Water Phase 111:D-4 Reservoir
Carlsbad Municipal Water District
Carlsbad, California
March 22, 2022
226816-0000111.00
Page 2
However, as noted in Sheet C-01, Detail B/C-1 the proposed paved road has a gradient ranging between
1% and 4%.
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SECTION II
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Based on a review of the site grading and draining plan, it is NV5's opinion that the minimum 1 % gradient as
noted above is acceptable for this project application.
Closing and Limitation
NV5 appreciates the opportunity to be of service. We have prepared this letter in substantial accordance with
the generally accepted geotechnical engineering practice as it exists in the site area at the time of our study.
No warranty is expressed or implied. The limitations discussed in the referenced report apply to the
recommendations contained in this letter. If you have any questions regarding this letter or need further
assistance, please contact us at your convenience.
Respectfully Submitted,
NV5 Inc.
--
L
Paul Cunningham, PE, GE No. 3186
Project Engineer
Distribution (1) Addressee, via e-mail
Carl Henderson, PhD, GE No. 2886
CDO / VP -Geotechnical Services W
NIVl5
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