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k`■ KLEINFELDER <br />4 ACTIVITIES CONDUCTED <br />Three monitoring wells were installed on May 20, 2002. The monitoring wells were designated <br />MW -1, MW -2, and MW -3. On May 23, 2002 the newly installed monitoring wells were <br />developed. Kleinfelder re -visited the site on May 28, 2002 to conduct the initial sampling event. <br />An elevation survey of the three monitoring wells was conducted on June 5, 2002. <br />4.1 PERMITTING AND PRE -FIELD ACTIVITIES <br />Kleinfelder's "Proposal, Additional Soil and Groundwater Investigation, Tradeway Chevrolet..." <br />dated April 29, 2002 was submitted to the San Joaquin County, Public Health Services <br />Department Environmental Health Division (PHS/EHD) for review. The monitoring well <br />application approval was obtained prior to initiating fieldwork. The boring locations were <br />marked in white paint and Underground Service Alert (USA) was notified at least 48 hours prior <br />to drilling activities. For a copy of the well permits, please refer to Appendix A. <br />4.2 MONITORING WELL INSTALLATION <br />The soil borings were advanced using a truck -mounted drill rig equipped with 8 -inch diameter <br />hollow stem auger. Soil samples were collected at 5 -foot intervals beginning at 5 feet for logging <br />purposes and potential chemical analysis. <br />The borings were drilled, logged, and sampled according to the protocol described in Appendix B. <br />A two-inch monitoring well was constructed in each of the three soil borings, as described in <br />Appendix B, Section B-3.1. Monitoring wells MW -1, MW -2, and MW -3 were screened from <br />approximately 15 to 30 feet bgs. The wells were screened using Schedule 40 PVC pipe with 0.010 - <br />inch factory cut slots. The 0.010 screen size was chosen due to the soil encountered at that depth. <br />See Plate 4 for a typical monitoring well construction diagram. A copy of the boring logs is <br />presented in Appendix C. <br />Soil samples were collected from each of the three soil borings. Laboratory analysis was <br />conducted on a total of six (6) soil samples (2 from each soil boring). The soil samples submitted <br />for analysis were collected at 10 feet bgs and 15 feet bgs. <br />Soil cuttings generated while drilling and decontamination water were placed in 55 -gallon drums, <br />labeled, and left on site pending chemical analysis and disposal by the client. <br />20-3978-03.CHEV / ST02RI I I Page 7 of 18 <br />Copyright 2002, Kleinfelder, Inc. July 1, 2002 <br />