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.� ' Architecture Engineering An Employee-Owned Company Environ menta I Stormwater Management Report . Land Surveying Companies Executive Summary This report has been prepared in support of an application by Stockton Metropolitan Airport for a site plan review from the City of Stockton for the proposed development improvements at 4725 S Boston Street. The property is approximately 113 acres in size and is currently partially developed with an airport apron, taxiway, and associated buildings. The project location is inside the Stockton Metropolitan Airport. The parcel is bounded by Arch Airport Road to the northwest, South B Street to the northeast, and the existing airport and taxiway to the south. All work is intended to be in full compliance with the City of Stockton Regulations, County of San Joaquin County Regulations, Stormwater Management Regulations, FAA Regulations, and State of California Regulations while taking prevailing site conditions and practical needs into account. The project includes development of warehouse building and parking lot with associated loading bay, driveways, and landscaping. The proposed developments will include stormwater Best Management Practices (BMPs)to treat the stormwater per the San Joaquin Final Stormwater Quality Control Criteria Plan(SWQCCP) requirements. Specifically, a bioretention system will be utilized to treat and convey the stormwater and meet the stormwater volume reduction requirements. The project is not subject to Section 401 of the Federal Clean Water Act because the site is not proposing any improvements within a 100' wetland buffer. The project is subject to the DEP Stormwater Policy for a new development. The majority of the work takes place in an undisturbed area. Existing topography of the site generally slopes from the northeast to the south, towards the existing southern catch basins and existing storm drainage line. Elevations vary from approximately 29 feet at the northeast corner of the site to 20 feet at the southwestern boundary. Runoff from the existing undeveloped area sheet flows to the existing southern catch basins. The proposed stormwater management system is designed to follow the Federal Clean Water Act (33 U.S.C. §§1251 et seq.), State Water Quality Standard (40C.F.R. §122.44), and San Joaquin County Stormwater Quality Control Criteria Plan (SWQCCP) fully for the new development portion of the project. The State of California and County of San Joaquin require the protection of the physical, chemical, and biological integrity of the waters of the United States. The State and County regulate the integrity through the requirement of water quality standards. The project plans on utilizing a proposed drainage design in order to meet the water quality standards and reduce stormwater runoff. 220 Norwood Park South,Suite 201 • Norwood,MA 02062 • T(781)619-9500 • F(203)630-2615• www.blcompanies.com 1