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f S E C ® R Y Soil and Groundwater Assessment Work Plan 7-Eleven Store#32262 August 12, 2003 Page 3 approximately 3 casing volumes of water using a downhole pump or hand bailer until groundwater parameters of pH, temperature, and conductivity stabilized as measured by portable meters calibrated to a standard buffer and conductivity standard A grab water sample will collected from the tank pit observation point T-1 Groundwater samples will then be collected by lowering a clean disposable bailer into the well and collecting a representative sample of the formation water if the well is slow to recover, the sample was not collected until the water level has approached 80 percent of its initial level The groundwater sample will be slowly transferred to laboratory-cleaned sample containers, sealed with Teflon®-lined caps, and transferred to cooled storage Groundwater samples will be submitted to Kiff Analytical, a California-certified laboratory, for analysis of BTEX, TPHg, MtBE, and, tert-butanol (TBA), dusopropyl ether (DIPS), ethyl-tert-butyl ether (ETRE),tert-amylmethyl ether(TAME) by EPA Method 82608 WASTE HANDLING AND STORAGE During drilling operations, all augers, sampling tools, and down hole equipment will be steam cleaned prior to use All rinsate water, purge water and sod cuttings generated during the drilling operations will be stored in 55-gallon drums at the site pending laboratory analysis for proper disposal WATER SUPPLY WELL SURVEY SECOR will conduct a Department of Water Resources file review to identify water supply wells within a 2,000 foot radius of the site In addition, the City of Tracy Public Works Department will be contact to determine is any municipal water supply wells are located within the search radius The location of any water supply wells identified within the search radius will be confirmed during a field search from the public right-of-way A map showing the location of the water supply wells and a table summarizing the results will be prepared and included in the site assessment report REPORTING SECOR will prepare an assessment report summarizing the fieldwork completed and data collected including • Details of field procedures and operations • Boring logs • Tabulated results of the soil and groundwater sample analyses • Updated map showing the location of new wells The five newly installed groundwater monitoring wells and one tank pit observation point will be monitored and sampled quarterly •