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_ 02 November 1999 <br /> AGE-NC Project No. 99-0628 <br /> Page 2 of 8 <br /> Three unpermitted dry wells were installed at the site in 1996 for discharge of the excess wastewater. <br /> The design characteristics for the dry wells are not known, but according to Mr. Warren Snider of <br /> WSI,each dry well was approximately 42-inches in diameter and was excavated to a depth of 25 feet <br /> bsg. A 4-inch PVC casing is located near the center of each excavation and the remaining void space <br /> was backfilled with pea grave and river rock. The entire area around the dry well was then covered <br /> with approximately 5-inches of concrete. The dry wells were connected to the clarifier by 2-inch <br /> PVC piping. <br /> In early 1999, the clarifier system failed and was replaced with a sanitary sewer hook-up to the City <br /> of Stockton. All excess wastewater, not to exceed 400 gallons per day, is disposed under permit, into <br /> the City of Stockton sanitary sewer. <br /> 2.2. GROUND WATER DEPTH AND FLOW DIRECTION <br /> _ Based upon the San Joaquin County Flood Control Map Lines of Equal Depth in Water Wells- 1996, <br /> ground water depth in the area of the site is approximately 55 to 60 feet below surface grade. <br /> Regional ground water flow direction is east-northeast; however, flow direction and ground water <br /> depth can vary seasonally throughout San Joaquin County. <br /> 3.0. SCOPE OF WORK <br /> The scope of work included the following items: <br /> • Excavation of the three dry wells to a depth of approximately 26 feet below surface grade <br /> (bsg); <br /> • Advancement of one soil boring along the discharge line to a depth of 5 feet bsg; <br /> • Collection of discrete soil samples from approximately 2 feet below the bottom of each dry <br /> well, at a depth of approximately 28 feet bsg; <br /> • Collection of soil samples from the excavated (stockpiled) soil; <br /> • Transportation of soil samples under chain-of-custody to a certified laboratory for analysis; <br /> • Backfilling of each dry well to a depth of approximately 3 feet bsg with cement; and <br /> • Preparation of a technical report. <br /> Advanced GcoEnvironmental,Inc. <br />