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;ICVV 0 A S S O C I A T E S I N C encountered When the sampler was advanced, O-ring 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to the desired depth, extension rods were sent downhole to brace the bottom of the sample screen as the tool casing was retracted When the casing was retracted, approximately 41-inches of screen with slot sizes of 0 004 inches was exposed Teflon tubing with a check valve attached to one end was inserted down the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, DIPE, 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 sham- ' of-custody documentation are included in Appendix C 4.5 Hollow_ Stem Auger Drilling Activities On December 26 through ' throu h 28, 2001, an ATC geologist supervisedervised the advancement of three off- site ffsite soil borings to depths of approximately 42 feet bgs A site plan with soil boring locations is shown on Figure 2 Woodward Drilling, California License C57 710079, advanced the borings utilizing a hollow stem auger drill rig Soil samples were collected from the borings at five-foot intervals in stainless steel sampling tubes The cored samples and drill cuttings were characterized for soil type, moisture content, and ' visual evidence of petroleum hydrocarbons An FID was used as a field-screening device for the detection of petroleum hydrocarbon vapors in drill cuttings and cored samples A field geologist logged drill cuttings and soil samples utilizing the Unified Soil Classification System ' Descriptions of soil types encountered and sample collection intervals are included on the well construction logs contained in Appendix A The soil borings were then completed as three groundwater monitoring wells Drill cuttings were temporarily stored on site in 55-gallon DOT ' approved steel drums 4.6 Soil Analysis Selected soil samples were kept on ice and delivered under chain-of-custody documentation to P P y State-certified Argon Laboratories in Ceres, California for chemical analysis Selected soil samples were analyzed for TPHg by EPA method 8015, BTEX by EPA method 8020, and MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, and 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 ' w lwordpro162596%reporuloff-site doc 5