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' Project No S8080-06-OIC August 31, 1994 ' Task 3 - Soil Boring Confirmation Sampling • Task 6 - Additional Work (Limited Research) ' The scope of services performed for each of the above-referenced tasks is outlined in detail hereinafter ' Task 1 - Quarterly Groundwater Sam lm and Analyses The following field activities were performed during the sampling and analyses of the three existing onsite 2-inch-diameter groundwater monitoring wells t Surveyed the relative elevations of the top of each well casing for groundwater monitoring wells MW-1, MW-2, and MW-3 with a liquid level manometer, relative to an arbitrary datum of 100 feet located at the top of the well head cover for MW-1 • Performed groundwater depth measurements and checked each monitoring well for the presence of free product • Collected groundwater samples from the monitoring wells Prior to groundwater ' collection, approximately three well volumes of standing groundwater was purged to allow fresh formation water to infiltrate the wells During purging, the pH, temperature, and electrical conductivity of the groundwater was measured and ' the purging was considered complete when these parameters stabilized The purge water was retained onsite in 55-gallon drums pending the results of the laboratory analyses and subsequent disposal following regulatory protocol ' Collected groundwater samples utilizing disposable Voss polyethylene bailers The samples were placed in laboratory provided volatile organics analysis (VOA) vials,labeled, chilled, and delivered to an analytical laboratory following standard cham-of-custody procedures • Submitted the groundwater samples collected to a California-certified ' environmental laboratory (Excelchem Environmental Laboratories) for testing for total petroleum hydrocarbons as gasoline (TPHg) following EPA Test - 4 -