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� v A S S O C I A T E S I N C 4 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 1 2.1.2 Soil Sample Analysis Selected soil samples were kept on ice and delivered under chain-of-custody documentation to State-certified Argon Laboratories Inc (FLAP Cert No 2359) in Ceres, California for chemical analysis Selected samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA method 8015, 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 (DIPS), 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 2.13 Groundwater Sampling and Analysis Groundwater samples were collected from borings SBI through S134 at the depth groundwater was first encountered, approximately 61 feet bgs A Geoprobe® Screen Point 15 Groundwater Sampler was threaded onto the leading end of the Geoprobe after groundwater had been encountered When the sampler was advanced, O-nng seals and an expendable drive point ' provided a watertight system to ensure sample integrity When the tool was advanced to the desired depth, extension rods were sent downhole to brace the ' bottom of the sample screen as the tool casing was retracted When the casing was retracted, approximately 41-inches of screen with slot sizes of 0 004 inches was exposed Teflon tubing with a check valve attached to one end was inserted down the casing until it was immersed in ' groundwater Water was then pumped through the tubing and to the ground surface by oscillating the tubing up and down Following soil and groundwater sample collection, the borings were backfilled with neat cement grout to the ground surface Groundwater samples were kept on ice and delivered under chain-of-custody documentation to State-certified Argon Laboratories in Ceres, California for chemical analysis Groundwater samples were analyzed for TPHg by EPA method 8015, BTEX by EPA method 8020, and MTBE, TAME, ETBE, DIPS, TBA, 1,2-DCA, and EDB by EPA method 8260 The analytical results for groundwater samples are summarized in Table 2 Laboratory data sheets and chain- of-custody documentation are included in Appendix C Gat w, } fCSUA�s 2 1.4 Hollow Stem Auger Drilling Activities Hollow stem auger drilling was conducted on September 17 through September 21, 2001, by Woodward Drilling (State C57 license no 710079) Soil boring ASI was advanced to approximately 85 feet bgs, soil borings PZia and PZlb were advanced to approximately 80 feet w 1163931reportslnfs doe 3