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HAWKINS & ASSOCIATES <br /> ENGINEERING <br /> 2721 NATHAN AVE <br /> MODESTO,CA. 95354 <br /> Ph:(209)575-4295 <br /> Fx: (209)578-4295 <br /> INTRODUCTION <br /> This report is prepared for the SouthWinds Church project proposed near <br /> Lammers Road and Middle Road in Tracy, CA. The purpose of this report is to <br /> analyze the feasibility of constructing the necessary infrastructure associated <br /> with storm drainage, sanitary sewer disposal and water system that are required <br /> to support this development. <br /> STORM DRAINAGE <br /> The storm drainage system will consist of a site collection system and on- <br /> site retention basin. The retention basin will be sized in accordance with the San <br /> Joaquin County Standards. A preliminary calculation indicates that the basin will <br /> need to accommodate a runoff volume of 134,611 cubic feet (see attached storm <br /> drainage pond calculation). This can be accomplished by lowering the softball <br /> field area approximately three and one-half feet below the parking lot with five to <br /> one side slopes. The softball field and southern green belt area encompasses <br /> approximately 122,807 sq. ft. The water depth would be about 1 .1 feet when the <br /> design storm occurs. According to the county design standards, this area must <br /> be able to percolate within 10 calendar days. Given an average depth of 1.1 <br /> feet, the average percolation rate would need to be at least 1 .3 inches per day. <br /> This is a very slow rate and should be easily accommodated by the native soil. <br />