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Each soil boring was drilled using a truck-mounted hollow stern auger drill rig equipped with a split tube sampler The CME 55 drill rig and two-man crew were supplied by SES of Benecia, California Each boring was continuously cored and samples were collected at or inear each lithologic change and from areas where field screening indicated the presence of organic vapors All samples were field screened for the presence of organic vapors using a photo-ionization detector (PID Thermo Environmental Instruments 580A) Borings P-3, P-4 and P-5 were drilled to depths of 55 feet Boring BB-1 was drilled to a depth of 36 feet, no impacted soil was encountered in BB-1 Boring logs are included in Appendix C ' Samples were collected in clean 2 by 3-inch or 2 by 6-inch brass sleeves The ends of each sleeve were covered with aluminum sheets, capped and sealed with tape Samples were then placed in a chilled container and transported under chain-of-custody to Geochem Environmental Laboratories (GEL) in San Jose, California Each sample vas analyzed for TPH as gasoline and BTE&X in accordance with EPA methods 8015m and 8020, ' respectively Duplicate samples from each "zone"were also collected for bacterial analysis Samples were ' transported under chain-of-custody to GeoAudit's microbiologist (Mr Jim Hoeltgen) and analyzed for bacterial numbers and specific number of species Samples were also transported to MLI to obtain additional information on microbial activity ' 3.2 Groundwater Monitoring for Petroleum Hydrocarbons On December 19, 1994, monitoring procedures were performed at the site Prior to sampling, the groundwater depths were measured in each well After depth measurements were collected, each well containing sufficient water was purged and sampled As during ' past monitoring events, wells MW-1 through MW-5 did not contain enough water to purge or sample ' Samples were also collected on October 17 November 16 and December 7 1994 from wells MW-14 and EW-I and MW-12 (October 17 only) However, samples collected on November 16 were broken in transit to the laboratory 3 2.1 Monitoring Well Purge Procedures ' On December 19, 1994, a Solrnst water level meter was used to measure the groundwater depth in each monitoring well (Table 3) An attempt was then made to purge each well containing water of a minimum of three well volumes All wells had sufficient water for tpurging except MW-6 and MW-8 Wells MW-6 and MW-8 were bailed dry after removing approximately 15 gallons of water Each well except EW-I was purged using clean PVC bailers Well EW-1 was purged using a 2" submersible pump Temperature, pH and conductivity of the purge water were ' measured at approximately 1-gallon intervals (10-gallon intervals for EW-1) using a ICM QUEdC y Pcp dnx V41133 QEWQM6 1