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' k'" KLEINFELDER 3 0 SCOPE OF WORK A Soil Bonng/Momtonng Well Penmt was obtained prior to advancement of the Cone ' Penetrometer Tests (CPTs) Soil and groundwater samples were obtained at the CPT locations shown on Plate 1 Additionally, grab groundwater samples were obtained from an adjacent dewatering well (DW-32), and two samples were obtained from the dewatenng discharge from the ' Bore Pit near the southwest corner of I-5 and Country Club Drive Selected samples were chemically analyzed ' 3.1 PERMITTING AND PRE-FIELD ACTIVITIES I ' Kleinfelder met with San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD), the City of Stockton, and the County of San Joaquin regarding soil boring/well and encroachment permitting The PHS/EHD permit approval was obtained prior to ' initiating fieldwork The boring location was marked in white paint and Underground Service Alert (USA) was notified at least 48 hours prior to drilling activities For a copy of the boring ' permit, please refer to Appendix B 3 2. SAMPLE THE BORE PIT DISCHARGE AND SELECTED DEWATERING WELLS Grab water samples were obtained from 4 recently installed dewatering wells on the project In ' an attempt to minimize waste for disposal, the wells were not purged prior to sampling However, many of the dewatering wells had already been developed Only one of these wells (Dewatering Well 32, DW-32) existed in the subject area near the Shell station, and was sampled ' on April 5, 2003 Two grab groundwater samples were also obtained from the discharge of sedimentation tank which handles discharge from the bore pit (west of I-5) on April 5 and 11, 2003 The 3 samples were collected as described in Appendix A, and submitted to Alpha Analytical, Inc of Sparks, Nevada, a State of California certified laboratory The following is a summary of ' the analyses for the two Bore Pit Samples and a single Dewatering Well DW-32 The initial Bore Pit grab sample (April 5, 2003) was analyzed for the following ' • Total Extractable Petroleum Hydrocarbons as Referenced to Diesel TPH-D ' • Benzene, Toluene, Ethylbenzene, Xylenes [BTEX] by EPA Method 8015MI8020M The second Bore Pit grab sample (April 11 2003) was analyzed for the following ' • Total Petroleum Hydrocarbons (TPH) by EPA Method 1664 • Benzene, Toluene, Ethylbenzene, Xylenes [BTEX] by EPA Method 8260B ' • Volatile Organics by EPA Method 8260B 28699 E01 /ST03R627 Page 3 of 8 Copyright 2003,Kleinfelder,Inc April 22,2003