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it <br /> +� September 30,2002 <br /> Job Number: LG02-310 <br /> Page 3 <br /> and Spring 1999 maps were used to determine the general depth and flow direction of regional <br /> ground water(Plates 2 through 5) for the subject site.' The following table summarizes all the <br /> available ground water information collected for the site and the nearby area. <br /> Table 1. <br /> rte. Summary of Available Ground Water Information. <br /> y <br /> Date,Source Groundwater Notes <br /> Depth <br /> August 16,2002,six(6)soil borings, Greater than 25 No ground water encountered to a depth <br /> Neil O.Anderson&Associates,Inc. feet. of 25 feet. <br /> August 23,2002,well water sample Result::DBCP 0.074 ug/L,Nitrate 44 <br /> mg/L aS3. D$CP is 0.2 ug/L <br /> and nitrate is 45 mg/L as NO3 <br /> Fall 1998,San Joaquin County Flood Control About 75feet in. Gradient about 7.1 feetlmiie, flowing <br /> i... <br /> and Water Conservation District map.' depth. eastward. <br /> Spring 1999,San Joaquin County Flood About 70feet in Gradient about 4.8 feet/mile,flowing <br /> Control and Water Conservation District.' depth. southeast. <br /> i' MCL is maximum contaminate limit for safe drinking water. <br /> The depth to ground water below the site was approximately 70 to 75 feet between Fall . <br /> ` 1998 and Spring 1999 (see Plates 2 and 3). The ground water flow direction was toward the east <br /> and southeast with a gradient ranging between 4.8 to 7.1 feet per mile(see Plates 4 and 5). <br /> A water sample was obtained from the onsite water well located 5533 E. Quashnick <br /> Road, Stockton. The samples were collected on August 23, 2002 and sent to Precision Enviro- <br /> Tech Analytical Laboratory, Stockton on the same day. The laboratory tested the water samples <br /> for the presence of dibromochloropropane(DBCP) and Nitrate(NO3) per County requirements. <br /> �. The test results indicated that DBCP was non-detectable ffDland nitrate was found at <br /> 44 mg/1-NO3. The result of the nitrate test indicates the ground water is below the maximum <br /> contaminate level set by the United States Environmental Protection Agency of 45 mg/L as NO3. <br /> L- The test results are attached in the appendix. <br /> San Joaquin County Flood Control and Water Conservation District. Depth to ground water and ground- <br /> water elevation maps Fall 1998 and Spring 1999• Published biannually,Scale: 1 inch=2 miles. <br /> T OERSO� <br /> x <br /> C 4 <br />