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f . 01 March 2004 AGE-NC Project No 99-0645 Page 5 of 11 2 3 2 SVE Pilot Test Sampling and Analysis A total of four soil vapor samples were collected during each pilot test Soil vapor samples were collected at two-hour intervals from the sample port of the extraction well to measure hydrocarbon concentrations in the extracted gas The samples were collected in Tedlar bags using an air pump Samples were transported in a chilled container under chain-of-custody to McCampbell Analytical, Inc (MAI),a California Department of Health Services(DHS)-certified laboratory Each sample was analyzed within 72 hours for • TPH-g in accordance with EPA Method 8015M, and • BTEX and MTBE in accordance with EPA Method 8021 2 4 QUARTERLY GROUND WATER MONITORING PROCEDURES Field work was performed in accordance with procedures outlined in Initial Work Plan for Preliminary Site Assessment,prepared by AGE,dated 30 November 2000, and approved by the San Joaquin County Environmental Health Department (EHD) by letter dated 13 December 2000 2 4 1 Monitoring Well Evacuation and Monitoring On 06 October 2003, the water level in each of three monitoring wells was measured relative to the top of the well casing using a Solmst water level meter After water levels were measured, a dedicated,disposable plastic bailer was used to purge each well Three gallons(a minimum of three well volumes) of water were removed from the wells Temperature, pH and conductivity of the purged water were measured at one-gallon intervals using an Oakton water analyzer during purging, and the values had generally stabilized by the end of the purging process (Appendix D) Purged water was stored on-site in 55-gallon, DOT-approved drums 2 4 2 Collection and Analysis of Ground Water Samples Prior to collection of ground water samples,the depth to ground water was measured in each purged well to ensure that a minimum of 80% of the well volume had recharged A water sample was collected from each well using a new disposable plastic bailer Each water sample was transferred into three chilled 40-mL volatile organic analysis (VOA)vials containing 0 5 mL hydrochloric acid (18%) as a sample preservative and one 1-liter amber bottle After collection, the samples were labeled and placed in a chilled container for transportation under chain-of-custody to MAI, a California DHS-certified analytical laboratory, in Pacheco, California Advanced GeoEnvironmental,Inc