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4.2 Sampling Field groundwater monitoring data (conductivity, pH, temperature, and ' turbidity) and groundwater elevation data were used to determine the volume of purge water to be removed from each monitoring well prior to sampling Samples ' were collected after physical parameters stabilized and a minimum of three well volumes of water had been removed Purge water and other investigation-derived wastes (IDW) were placed in Department of Transportation (DOT) approved 17E/H drums IDW will be sampled and submitted to the District's laboratory for waste characterization as specified in the July 1993 Additional Assessment and Groundwater Monitoring Work Plan (Work Plan) Upon receipt of the waste profile ' characterization results, the IDW will be appropriately disposed Three groundwater samples were collected from monitoring wells MW-1, MW-8, and MW-9 using 1-inch Teflon bailers as specified in the September 1993 ' Addendum to the Work Plan All samples were collected in three 40-milliliter (ml) volatile organic analyte (VOA) vials preserved with a hydrochloric acid solution and ' submitted for benzene, toluene, ethylbenzene, and total xylenes (BTEX) and TPH-g analyses Additional groundwater was collected from MW-8 in a 500-m1 glass far for the purpose of conducting a bacterial platelet count Groundwater samples were not collected for total lead analysis, per agreement between BVWST, the District, and Ms Diane Hinson (SJCPHS) ' The three samples from MW-1, MW-8, and MW-9, along with the appropriate Chain-of-Custody forms, were submitted to the District's state certified laboratory The samples were analyzed for BTEX by U S Environmental Protection Agency (USEPA) Method 8020, and for TPH-g by USEPA Modified Method 8015 ' The groundwater sample from MW-8 was submitted to Anlab Analytical Laboratory (Anlab), a state certified independent laboratory, for a bacterial platelet count This test determines the total number of colony-forming bacterial units per gram of sample The test was conducted in accordance with SM 9215B There is no standard EPA method for this test Quality control samples were collected in the field to provide a control on the sampling, analysis, and shipping procedures A spilt sample was collected from ' MW-9, submitted to Anlab, and analyzed for BTEX and TPH-g to provide a control on the analytical procedures The quality control samples were collected and handled in the same manner as the other samples One trip blank, prepared by the District ' laboratory, consisting of one 40-m1 VOA vial, was shipped with the collected samples i 941ZB East Bay Municipal Utility District 40429600 lstgtr gw 9 Slockton Service Center First Quarter 1994