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r' <br /> r <br /> 1 <br /> • ice, and transported to the laboratory accompanied by the appropriate chain-of--custody <br /> ' documentation <br /> Laboratory Analysis for Soil Samples <br /> ' Analyses for TPHg, benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and MtBE <br /> were performed by EPA Methods 8015/8020 Fuel Oxygenates were analyzed by EPA <br /> ' Method 8260 Analysis for lead was done using EPA method 6010A <br /> Well Development and Groundwater Sampling Procedures <br /> The sampling procedure for each well consisted first of developing the well by purging <br /> approximately 10 casing volumes of water from the well Sampling consisted of measuring <br /> ' the water level and checking for the presence of separate-phase hydrocarbons (SPIT), using <br /> either an electronic indicator and a clear Teflon® bailer or an oil-water interface probe <br /> Wells that have submerged screens are purged of approximately three casing volumes of <br /> water (or to dryness) using a centrifugal pump, gas displacement pump, or bailer The <br /> equipment and purging method used for the current sampling event was noted on the attached <br /> ' field data sheets During purging, temperature, pH, and electrical conductivity were <br /> monitored in order to document that these parameters are stable prior to collecting samples <br /> • After purging, water levels were allowed to partially recover Groundwater samples (both <br /> ' purge and no purge) were collected using a Teflon bailer, placed into appropriate EPA- <br /> approved containers, labeled, logged onto chain-of-custody documents, and transported on <br /> ' ice to a California State-certified laboratory <br /> Laboratory Procedures for Groundwater Samples <br /> ' The groundwater samples were analyzed for the presence of total petroleum hydrocarbons <br /> calculated as gasoline, benzene, toluene, ethylbenzene, xylenes, and MtBE by EPA Method <br /> ' 8015/8020 Fuel oxygenates were analyzed by EPA Method 8260 These analyses were <br /> performed by utilizing a purge and trap extraction technique, with final detection was by gas <br /> chromatography using flame- and photo-ionization detectors or mass spectrometer (8260A) <br /> ' The methods of analysis for the groundwater samples are documented in the certified <br /> analytical report The certified analytical reports, chain-of-custody documentation, and field <br /> data sheets are presented as Attachment D <br /> 1 <br /> • <br /> 1 <br />