Kimley»Horn
DATE: September 22, 2023
TO: Run Chen, Senior Engineer - City of Menifee Public Works / Engineering Department RE: Planning Application No. DEV2022-027 Mister Car Wash - WQMP & Drainage Memorandum
Mister Car Wash - Menifee WQMP & Drainage Memorandum
The purpose of this Memorandum (Memo) is to discuss and compare the changes to the site design of the parcels being utilized to construct the Mister Car Wash Project and KinderCare Project (Projects), and how these changes will not produce an increase in runoff than that assumed in the previously approved Water Quality Management Plan (WQMP) for the Shoppes at the Lakes (Shoppes). The previously approved WQMP analyzed the entirety of the Shoppes area, which included the Projects.
The Projects are located in the southeast corner of the Shoppes, generally located at the northwest corner of the intersection of Rockport Road and Laguna Vista Drive.
The proposed Mister Car Wash project spans two parcels: Assessor's Parcel Numbers (APNs) 364- 390-010 & 364-390-011. The proposed KinderCare project spans two parcels: APNs 364-390-009 & 364-390-012. Lot mergers for each project will be completed prior to construction to combine each project's two parcels into a single parcel. The project site is located at the "Shops at the Lakes" shopping district and was approved by the City of Menifee on May 5, 2015.
The Shoppes is an approximately 14-acre shopping center and the Projects are located in the southeast corner; refer to Exhibit 1: Entitled Center Design Pervious and Impervious Values. In its existing conditions, runoff drains via sheet flow conditions to two area inlets that then flow to a lift station and then get pumped into a bioretention pond.
Car washes utilize on-site infrastructure to recycle water used during car wash operations. Nuisance water will be conveyed and treated via the existing storm drain system, lift station, and bioretention pond. The proposed Mister Car Wash and KinderCare projects are providing more pervious area than what was allocated in the approved WQMP for the Shoppes. Refer to Table 1: Entitled Center Design vs Proposed Design Pervious and Impervious Values, which provides the proposed pervious and impervious areas of the Mister Car Wash and KinderCare sites. The attached exhibits show the previously approved pervious and impervious areas for the same sites. The detention basin was sized to detain and treat the 100-year 24-hour event for the development of these parcels. Since the design being proposed in the previous entitlement submittal accounted for more impervious area, it is not kimley-horn.com 3801 University Avenue - Suite 300, Riverside, CA 92501 951 543 9868 Kimley» Horn Page 2
anticipated that the construction of these projects will result in increased runoff or contaminants; therefore, no modifications will be made to the existing lift station and bioretention pond.
Table 1: Entitled Center Design vs Proposed Design Pervious and Impervious Values
ENTITLED CENTER DESIGN
See Exhibit 1 for values
PROPOSED DESIGN
TOTAL PERV.
BMP ID# IMPERV. AREA BMP BMP
DMA # AREA (SF) AREA (SF)
CLASSIFICATION PROVIDED
(SF)
EXIST.
1.0 BMP 1 43,895 35,946 7,949 BIORETENTION DETENTION
POND
EXIST.
2.0 BMP 2 42,770 37,629 5,141 BIORETENTION DETENTION
POND
OVERALL 86,665 73,575 13,090 -
For any comments or questions, please reach out to John Pollock at john. [email protected]. kimley-horn.com 3801 University Avenue - Suite 300, Riverside, CA 92501 951543 9868
PRIVATE STREET
LAGUNA VISTA DRIVE
MISTER
CAR WASH
KINDERCARE
LACARA STA GENE EA
EGEND BUP 01 CLASSNGATICN BUP PROVED
LICA (ST)
CENTER LINE EXISTING BIORETENTION
we s 5 9÷6 2,949 ON TNTON POND
MuT Manly 18e
EASEVENT LAN: 42,770 37,629 3,341 (BMP 1)
Храмо с вит в 2000 188
OVERALL 6 GES
DENOTES DRAINAGE AREA DOUNDARY
LONGEST FLOW PATH
LANDSCAPE/PLANTER AREA
ROPOKEN SPOT FIEVATION
xine spot fitzat
PROPOSED SURSAÇE LON CINECTION ROCKPORT ROAD
GRAPHE SOME IN RECTO
DRAWACE LABEL A AREA 9ZC
Kimley Horn SHEET NO.
CANCE SALON SITE NO ENGINEERING DEPARTMENT
C3.0
MENIFFE CA 1026 NEWPORT MISTER CAR WASH
MECHER D TRACT/PARCEL MAP or 10_
1-330-227-2808 PROPOSED DRAINAGE MAP BLECT I DEV2022-027 665.83 S LEGEND:
D-1 ROSARASH ENCORES CONSUNG
O-2 PARKAC LOT
0-3 PUNTER
A PLANTER AREA SEUR TRIANG
EXHIBIT 1
ENTITLED CENTER DESIGN PERVIOUS AND Kimley» Horn
IMPERVIOUS VALUES WWWW. KIMLEY-HORN.COM
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