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� v 0 A S S O C I A T E S I N C 4.0 SITE INVESTIGATION ACTIVITIES All work described herein was performed in accordance with ATC's Workplan for Additional Soil Boring and Monitoring Well Installation Activities at 610 North Hunter Street, Stockton, California, dated October 10, 2001, which was approved with minor modifications by SJEHD in correspondence dated October 24, 2001 ' 4.1 Geo robe® Drilling Activities On December 11, 2001, ATC personnel supervised advancement of four soil borings, SB 12 through SB 16 to first encountered groundwater, approximately 26 to 27 feet bgs The soil borings were advanced at the locations shown on Figure 2 to evaluate the horizontal extent of ' petroleum hydrocarbon impacted soil and groundwater 4.2 Soil Boring Advancement and Sampling Fisch Environmental, California License C57 683865, advanced the borings using a truck mounted Geoprobe® narrow diameter ng employing direct push technology Soil samples were collected from borings SB 12 through SB 16 at five-foot intervals in acetate sampling tubes and were described according to the Unified Soil Classification System Descriptions of soil types ' encountered and sample collection intervals are presented on the boring logs contained in Appendix A Each soil sample was field screened with a Flame Ionization Detector (FID) for the presence of volatile organic compounds Sample tubes were then sealed at each end using Teflon tape and ' plastic end caps, labeled, and placed on ice 43 Soil Sample Analysis Selected soil samples were kept on ice and delivered un P P der chain-of-custody documentation to State-certified Argon Laboratories Inc (ELAP Cert No 2359) in Ceres, California for chemical analysis Selected samples were analyzed for TPHg by EPA method 8015, benzene, toluene, ethyl benzene, and xylenes (BTEX) by EPA method 8020, and methyl tertiary butyl ether (MTBE), tertiary amyl ether (TAME), ethyl tertiary butyl ether (ETBE), tertiary butyl alcohol ' (TBA), di-isopropyl ether (DIPE), 1,2-dichloroethane (1,2-DCA), and ethyl dibromide (EDB) by EPA method 8260 The analytical results for soil samples are summarized in Table 1 Laboratory data sheets and chain-of-custody documentation are included in Appendix B ' 4.4 T, Groundwater Sampling and Analysis Groundwater samples were collected from borings SB 12 through SB 16 at the depth groundwater was first encountered, approximately 23 feet bgs A Geoprobe® Screen Point 15 Groundwater Sampler was threaded onto the leading end of the Geoprobe after groundwater had been w lwordpro1625961reportsloff--site doe 4