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' Job No. 4780201 • • 6 t3.3 Well Development & Sampling Groundwater monitoring well MW-1 will be developed and sampled using EPA- and State-approved methodologies. During development, at least 10 casing volumes of groundwater will be removed from the well in an effort to remove suspended materials and stabilize the well sand-pack. After development, the well will be allowed to stabilize for at least 24-hours wprior to sampling. During pre-sampling purging, at least three well-casing volumes of groundwater will be removed from the well using a dedicated Ndisposable bailer. During purging, evacuated groundwater will be observed for the presence of sheen or odor and physical groundwater parameter readings, ' including electrical conductivity, temperature, turbidity, and pH, will be taken until these readings indicate that the well has stabilized. Once the well has stabilized, samples will be collected using a dedicated disposable bailer. Sample material will be dispensed into bottles appropriate for the required analyses. The water will be transferred from the bailer to the bottles in a manner that will minimize the evaporation of volatile constituents. Each bottle will be filled in a manner that will diminish any entrapped air or headspace. The bottles will then be secured, labeled, and placed on ice in a ' cooler for transport to the laboratory. Groundwater produced during sampling procedures will be contained in labeled, 55-gallon drums and stored on-site ' pending appropriate disposal. ' 3.4 Sample Analyses ' All soil and groundwater samples will be analyzed for TPHd, TPHg, and BTEX. ' The groundwater sample collected from well MW-1 will also be analyzed for MTBE. Sample analyses will be conducted at Entech Analytical Labs, Inc. of ' Sunnyvale, California ICA ELAP# 1369). EC, Inc. April 4, 1997