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2.0 PROCEDURES Depth to ground water was measured in each well with an electronic gauge. The volume of wato: to be purged was calculated by adding the volume of water in the casing to the annular volume of water (assuming a 30 percent porosity). Each well was purged of a minimum of three well volumes based on the recommendation of Mr. Harlin Knoll with the " County who was in attendance. The minimum amount of water necessary to purge and the actual approximate amount purged (gallons) for each well is listed below. WELL 3 WELL, VOLUMES V O L U M E PURGED PURGED MW-1 50.3 60 MW-2 52.75 60 MW-3 51.3 60 A submersible pump at a rate was ten gallons per minute was used for well purging. At three or four intervals for each well a sample of water was collected and measured for the ground-water quality parameters of conductivity, pH and temperature. The well was considered stabilized when the water ran clear and the parameters were within 10°!a of the previously recorded value. Between each well, the pump was decontaminated in an Aleniaoxe solution and then tap water. Purge water was placed in a labeled drum and left on site. Disposable bailers were used to sample each well. Three 40-milliliter VOA bottles and an amber one-liter bottle were collected from each well. For quality assurance and control (QA/QC)a duplicate sample was collected from MW-2 and a laboratory-supplied trip blank was utilized throughout sample collecting and shipment. All samples were placed in cold storage with a `-ip blank and transported by chain-of-custody to Curtis and Tompkins, a California state-certified analytical laboratory. All samples were analyzed for Total 4