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f i ' 12 January 1998 • AGE-NC-95-0103 Page 2 of 7 3 _ water purging parameters are Included in Appendix A 2 2 _ GROUND WATER SAMPLE COLLECTION Water samples were retrieved from each purged well using new disposable bailers The samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml of 18%hydrochloric acid as a preservative and were transported in a chilled container under chain-of-custody to McCampbell Analytical, Inc (MAI), in Pacheco,California, for laboratory analysis Samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile T aromatic compounds (benzene, toluene,ethyl-benzene and total xylenes BTE&X) and methyl-tert- butyl ether (MTBE) and the oxygenating fuel additives tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME) in accordance with EPA methods 8015m and 8020 and 8260m- 23 260m23 IN-SITU AIR SPRAGINdSYSTEM REPAIRS y On 22`December 1997 the inlet pressure line fitting for IAS system compressor was replaced Wear and possibly damage incurred during shipping caused a system failure The system was non- operational from 18 December to 23 December 1997 -2 4 SPARGING/EXTRACTION SYSTEM MONITORING The IAS system operated continually during the quarter, except during the above mentioned repair period and was monitored and serviced weekly The sparging flow rate was adjusted to approximately 10 scfm and to a minimum pressure of 15 psi During each monitoring event, the depth to ground water and per cent dissolved oxygen were measured for each monitoring well(Table - 3) General system maintenance and adjustments were performed in October and December 1997 _ Due to unstable operation and lowerformance the SVE unit was monitored ed daily, when possible The flow rate of extracted vapor was measured using a Dwyer differential pressure flow meter Organic vapor concentrations in the extracted soil gas stream were measured before entering the blower (influent stream),between the carbon canisters, and after exiting the canisters (effluent - stream) using an organic vapor-meter (OVA) equipped with a photo-ionization detector (PID Thermo Environmental 580A, 10 OeV, calibrated to isobutylene) Only two soil vapor samples were collected during this quarter On 22 October and 26 November - r _ Advanced GeaEnvironmental,Inc f,