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k■ KLEINFELDER e t (MW-1). Groundwater flow was found to be to the southwest with a gradient of 0.010 ft/ft. For a summary of elevation data see Table 1. A groundwater flow direction and contour map is depicted on Plates 4 and 5. 4.5 COLLECTION OF GROUNDWATER SAMPLES A total of four groundwater samples were collected on October 29, 2003. The groundwater samples were collected from monitoring wells MW-1 through MW-4. The wells were purged and sampled using disposable bailers as generally described in Appendix B. A transparent disposable bailer was partially submerged into the groundwater prior to purging each monitoring well to assess the groundwater for a potential sheen and/or floating product. No sheen or floating product was observed in the water from the four monitoring wells, nor were any unusual odors noted. Copies of the monitoring well sampling logs are included in Appendix C. Purge water from the monitoring wells was stored on site in labeled 55-gallon drums pending chemical analysis and disposal by the client. t The four groundwater samples were submitted for the following analyses: I • Total Purgeable Petroleum Hydrocarbons as referenced to Gasoline [TPH-G] by EPA Method 8015M; • Five Oxygenates (ETBE, DIPE, MTBE, TAME and TBA), by EPA 8260; • Total Extractable Petroleum Hydrocarbons as referenced to Diesel and Motor Oil [TPH-D/MO] by EPA Method 8015M/3015. The groundwater samples collected from perimeter monitoring wells MW-1, MW-3 and MW-4 were also submitted for the following analyses: • Volatile Organics by EPA Method 8260; 4.6 HAND AUGER SAMPLING Shallow soil sampling was conducted using a hand auger and hand sampling device in multiple areas including a wash down area, chemical storage area, retention basin (pond) areas and from an approximately 75 yard soil stockpile. Each of the soil borings were advanced in these areas using a stainless steel hand auger. Soil samples were obtained by slide hammering a 2-inch diameter by 6-inch long stainless steel tube into the soil at the desired sampling depths. The stainless steel tube was then removed from the boring and sealed with Teflon° sheeting and tight-fitting plastic end caps. The samples were immediately stored in an iced cooler. The samples were transported under chain-of-custody 36274/ST03RI919 Page 8 of 19 I 2004 Kleinfelder,Inc. January 5,2004 Q