SITE INFORMATION AND CORRESPONDENCE

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GeoSyntec Consultants The north side of each well box and PVC well casing will be surveyed for elevation and location by a licensed surveyor. This information will be used to develop a groundwater elevation contour map from which the groundwater flow direction beneath the site can be inferred. Format of the survey will be compatible with State Water Resources Control Board(SWRCB) GeoTracker database. All investigation-derived waste materials will be contained and stored on site pending appropriate disposal. Purge water and decontamination water will be contained in tanks or drums, labeled, and remain at the facility, pending appropriate disposal. Before leaving the site, GeoSyntec will collect a composite sample of the purge water and decontamination water and a composite sample of the soil cuttings from each well for waste classification. 4.3 Pre-iniection Groundwater Sampling and Analysis Groundwater samples will be collected from the new performance monitoring wells and nearby existing monitoring wells to document the groundwater geochemistry and COC concentrations before starting the pilot test. Pre-injection groundwater samples will be collected from wells PM-1, PM-2, E-1, and MW-8. The pre-injection sampling will be performed at least one week after the new wells PM-1 and PM-2 have been developed. Groundwater samples will be collected from each well according to the following procedures: • purging and sampling equipment will be cleaned in a solution of laboratory-grade detergent and distilled water and rinsed with distilled water; • the water level and total depth at each well will be measured and recorded; • wells will be purged using a bailer or submersible pump; • during purging, general water quality parameters (pH, specific conductance, turbidity, and temperature) will be periodically measured and recorded; WC05038 Final.doc 12 7/21/2005