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Valley Water Treatment, Page Groundwater Monitoring Well Construction ' Project No. 4802 March 14, 2006 determining the presence of free-phase gasoline. No measurable free product was detected. ' The wells were developed using a Wattera pump with new, dedicated, Teflon tubing for each well. Well water, was pumped into 55-gallon DOT approved ' polyethylene drums, properly labeled, and temporarily stored on-site. The rate of well purging was monitored, and each well was purged of at least three casing volumes or until the groundwater parameters (temperature, conductivity, and PH) had stabilized indicating that water representative of actual aquifer conditions was entering the well_ Groundwater parameter stabilization was characterized by three successive readings within 10 percent. 1 The sample water was carefully transferred to 40 ml VOA vials preserved with hydrochloric acid provided by the laboratory. Extreme care was taken to ' prevent agitation of the sample before they were sealed. Disposable gloves were worn by the sampling technician while collecting all samples. The gloves were changed between the collection of each sample to reduce the potential for cross- contamination. All samples were checked for head space bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for transport 10 to the laboratory. 2 .3 Waste Disposal During drilling, the soil cuttings were stored in drums and will be disposed of at a class lI landfill facility. A total of 3 drums of gasoline contaminated rinseate water were generated during the drilling, purging, and sampling activities described above. This water will be removed for recycling by American Valley Environmental. 1 I i 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293 I