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' 20 July 1998 AGE-NC Project No 95-0137 ; ' Page 4 of 8 ' a pre-cleaned, two-stage, submersible pump Approximately 10 gallons of water (a minimum of three well volumes)per well were removed from the IAS wells and 3 gallons of water were removed from each vapor extraction wells using a pre-cleaned,two-stage, submersible pump Temperature, pH, and conductivity were measured at approximately one-gallon intervals using an ICM Water Analyzer Model No 5200 The field data sheets are included in Appendix C Purged water was stored on-site in 55-gallon drums 1 ' 23 GROUND WATER SAMPLE COLLECTION After purging of three well-volumes of water form each well, stabilization of ground water pH, ' temperature and conductivity readings, and restabilization of ground water elevation, water samples were collected from each well using new, clean, disposable plastic bailers The samples were transferred into 40-m1 EPA-approved VOA vials and into 1-liter amber bottles Samples were stored ' in a chilled container and transported under chain-of-custody to McCampbell Analytical Laboratories (MAT) in Pacheco, California ' S Each sample was analyzed in accordance with the following EPA Methods • Method 8015-m modified for total petroleum hydrocarbons quantified as gasoline (TPH-g), ' • EPA Method 8015-M modified for total petroleum hydrocarbons quantified as diesel (TPH- d), ' • EPA Method 8020 for benzene, toluene, ethylbenzene and xylenes(BTE&X) with methyl- tert butyl ether(MTBE), ' • EPA Method 8260m for and MTBE and other oxygenated fuel additives, including tertiary butyl alcohol(TBA),dl-isopropyl ether(DIPS),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME) ' 3.0. FINDINGS J 31 STRATIGRAPHY Tan siltyclay and interbedded sand were encountered at the site Silty clay was distributed from the surface to 10 feet bsg and in a three foot layer at a depth of 15 feet bsg Sand was distributed from depths of approximately 10 feet bsg to 15 feet bsg and from 20 feet to 30 feet bsg Clay with gravel clasts were encountered from 30 feet to 35 feet bsg A stratigraphic cross section of the soil at the site is depicted in Figure 3 Advanced GeoEnvironmental,Inc