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HomeMy WebLinkAboutParcel Map 36203 Parcel 1 Hydro Memo kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 MEMORANDUM To: Engineering Department City of Temecula From: Thomas Kim, PE Kimley-Horn and Associates, Inc. Date: July 24, 2024 Subject: Hydrology Drainage Memo To whom it may concern, Below is the analysis of the hydrologic and hydraulic conditions associated with the development of the project site: The proposed project improvements utilize the existing building and infrastructure for a Tesla repair facility. The site area is 3.35 acres with only 0.96 acres of proposed improvements which will include the construction of asphalt pavement, concrete pavement, landscaping, concrete curb, and storm drain piping. Existing conditions, as shown in Attachment “A”, display drainage sheet flowing to the existing valley gutter that conveys to a nearby vegetated swale along the South. Flow then infiltrates the swale or sheet flows to the nearby creek. Proposed conditions, as shown in Attachment “B”, display the runoff generated will sheet flow towards a proposed storm drain inlet and catch basin. Runoff will then be routed to a biofiltration treatment system. The biofiltration basin is sized to capture and treat runoff for the DCV. In the case of larger storm events, excess runoff will flow into the underdrain and flow through the storm pipe system before being pumped onto the existing curb and gutter on Diaz Rd. In conclusion, the project aims to improve the existing drainage conditions through capture and treatment. The project also aims to maintain the same amount of pervious area as existing conditions due to the nature of the project scope (Tenant Improvement). Therefore, the peak flows are going to be lower than the existing conditions and the overall need for hydrologic analysis would not be required. Please contact me at (714) 786-6297 or thomas.kim@kimley-horn.com should you have any questions. Sincerely, Thomas Kim, PE APPROVED BY CITY OF TEMECULA PUBLIC WORKS valerie.caragan 08/17/2024 08/17/2024 08/17/2024 08/17/20 Page 2 kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 Attachments A. Pre-Development Exhibit B. Post-Development Exhibit Page 3 kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 Attachment A DIAZ RD A1 2.49 A2 0.41 A3 0.45 CITY OF TEMECULA PRE DEVELOPMENT HYDROLOGY EXHIBIT FOR TESLA REPAIR FACILITY TESLA REPAIR FACILITY PRE DEVELOPMENT HYDROLOGY EXHIBIT DIAZ ROAD CITY OF TEMECULA 1© HYDROLOGY SUMMARY LEGEND: HYDROLOGY INFORMATION X XXX NO R T H Page 4 kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 Attachment B DIAZ RD A3 0.06 A5 0.02 A2 0.11 A1 0.32 A6 0.06 A4 0.44 CITY OF TEMECULA 1© NO R T H HYDROLOGY SUMMARY LEGEND: HYDROLOGY INFORMATION X XXX TESLA REPAIR FACILITY POST DEVELOPMENT HYDROLOGY EXHIBIT DIAZ ROAD CITY OF TEMECULA POST DEVELOPMENT HYDROLOGY EXHIBIT FOR TESLA REPAIR FACILITY