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1 <br /> NZ&AANAM <br /> September 17, 1993 <br /> Skobrak Property, Stockton, California <br /> 4.1.7 Groundwater Sampling <br /> Following well development, the wells will be purged and a groundwater sample will be <br />' retrieved from each well following stabilization of electrical conductivity, pH, and temperature, <br /> to ensure samples collected are representative of formation water Water sample collection and <br />' preservation will be in accordance with a PHS/EHD approved QA/QC Plan Clean, disposable <br /> bailers with bottom emptying devices will be used to reduce volatilization <br /> 1 <br />' 4.1.8 Laboratory Analyses - Groundwater <br /> All samples will be transferred to appropriate sample containers, labelled with sample <br />' identification, placed on ice, and shipped under chain-of-custody to a State-certified laboratory <br /> Water samples collected from wells located in the vicinity of former Tank A will be analyzed <br />' for BTEX and TPHg Water samples collected from the well in the vicinity of former Tanks <br /> B and C will be analyzed for BTEX, TPHg, TPHd, and ethylene dibromlde (EDB) All <br /> analyses performed will adhere to the appropriate EPA methodologies <br />' 5.0 REPORTING <br /> A problem assessment report will be prepared according to Tri-Regional guidelines summarizing <br />' the findings of the investigation The report will contain tabular representations of groundwater <br /> elevation and groundwater quality data as well as a graphical representation of groundwater <br />' gradient A Registered Geologist will review and sign the problem assessment report <br />' 6.0 REFERENCES <br /> o Preliminary Assessment Report, Potential Soil and Groundwater Contamination, January <br />' 12, 1990, WaterWork Corp <br /> o Laboratory Report, June 6, 1990, Canonie Environmental <br /> 0 Sema-Annual Groundwater Report, Fall 1992, San Joaquin Flood Control and <br /> Conservation District <br /> WP-0993 DRF 6 <br />