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� 0 • Following liquid level measurement, each of the wells will be purged and sampled The wells will be purged with decontaminated PVC bailers or downhole pumps until at least three (3} well casing volumes have been extracted and after groundwater temperature, pH and electrical conductivity values have stabilized Groundwater will be sampled from the wells using disposable Teflon bailers and laboratory-supplied containers Each sample container will be labeled, packaged in an iced cooler and transported under chain-of-custody manifest to NEI/GTEL for laboratory analysis t2 4 2 Laboratory Analysis of Groundwater Samples All groundwater samples will be analyzed for TPH-as-diesel and TPH-as-gasoline by Modified EPA Method 8015 and BTEX and MTBE by EPA Method 8020 A detection of MTBE will be confirmed by EPA Method 8260 All laboratory analyses will be performed on a standard turn- around of ten (10)working days 25 Project Reporting ' Protect reports will be prepared and stamped by a state of California Registered Geologist Copies will be submitted to the PHS-EHD and to the County of San Joaquin Facilities Management Division 2 5 1 Site Investigation Report The methods and findings associated with the site investigation will be reported in a Site Investigation Report In addition to a standard discussion of methods, the report will include the following ' 6 Site location map and site plan, • Map illustrating groundwater surface and gradient, • Figures depicting extent of impacted soil and groundwater, • Boring logs and cross-sections, if appropriate, • Tables summarizing laboratory results, ' Recommendations for future environmental corrective action and/or closure 1 ' Work Pian Environmental Site Investigation Ramage Environmental 392 south Moffat Blvd,Manteca,California June 18,1997 8