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STOCKI'ON METROPOLITAN AIRPORT-SPrF4,kL PURPOSE PLAN SPE GLAND USE GUIDELINES AND STANDARDS 4 � y Storm. Drainage Existing storm drainage for the airport property is County Standards the Weber Slough system (System provided by two separate systems,the Mansville sys- 1) will generate approximately 91 acre-feet of storm tem and the Weber system.The Mansville system water runoff for the 100-year,48-hour storm. drains into the Mansville ditch and serves approxi- Evacuation of the Weber Slough basin will require mately 922 acres.The Weber system drains into discharging approximately 46 cfs into Weber Slough Weber Slough and serves approximately 627 acres. during off-peak periods.Weber Slough has a capacity Both the Mansville ditch and Weber Slough ultimately of approximately 100 to 292 cfs and can accommo- r drain into French Camp Slough. ("Stockton date the 46 cfs during off-peak periods. �# Metropolitan Airport Master Plan,Overall Drainage Studies", Richard W. Brandley, December 1997). Based on the proposed land uses and San Joaquin County Standards the Mansville system (System 2) The proposed storm drainage plan is generally con- will generate approximately 78 acre-feet of storm sistent with the "North Little Johns Creek Drainage water runoff for the 100-year,48-hour storm. F Study" (Ensign and Buckley, May 1993) and "Stockton Evacuation of the Mansville basin will require dis- Metropolitan Airport Master Plan, Overall Drainage charging approximately 40 cfs into the Mansville ditch Studies" (Richard W. Brandley, December 1997). during off-peak periods. Based on uniform flow con- Other details on the plan are contained in the siderations the approximate capacity of the Mansville Stockton Airport East Development - Storm ditch is 125 cfs and can accommodate the 40 cfs L7 Drainage Master Plan, prepared by A.R. Sanguinetti & during off-peak periods. Associates,dated December 1999. The proposed plan includes an interim drainage facili- Under the proposed master storm drainage plan for ty for the Weber system (Figure V C).The interim t the Airport East development area, the Weber sys- system will provide for the construction of approxi- tem (System 1) will serve approximately 302 acres of mately 35 acres of land adjacent to Giannecchini and the proposed project area,and the Mansville system Arch-Airport. Storm drainage for the interim system (System 2) will serve approximately 242 acres of the will consist of a portion of the ultimate piping system proposed project area. Detention basins will 6e and a temporary storm water retention pond. Based squired for b th,systems due to.;the increased' on San Joaquin County Standards the retention pond runoff associated with converting agricujtural land to will be required to hold approximately 14 acre-feet co7mercial and industrial I n-d!Aistorm water,collec- of runoff. tion..system consisting of pipes ,channels and deters= tion ponds is�"shown on,Figure�V-C. System 2 indi- Refer to the A.R. Sanguinetti &Associates Storm sates a channel along the southern boundry of the Drainage Master Plan,dated January 2000,for detail. system. Table V-3 identifies the system service areas and storm flow amounts. Detention basins will be required for both systems, and pump stations will be constructed at each basin. 1 Pump station discharge into the Mansville ditch and Weber Slough will occur only during periods of off- peak flows to ensure no net increase in stream flows.This can be accomplished by using a flow sen- sor in the channel to control the pump station dis- charge thereby providing no net increase in the chan- nels. 1� FJ Based on the proposed land uses and San Joaquin INFRASTRUCTURE V. 1-11