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Harlen Knoll February 2, 1990 Page 3 submersible pump until the discharge water clears. This procedure will be repeated twice for each well. Surging of the wells will also take place during the pumping phase of development by turning off the submersible pump (with the foot valve removed) intermittently during pumping. Each well will be swabbed approximately 30 to 40 times at a slow speed over the entire length of the well screen followed by pumping of the well until the discharge water clears. This step will then be repeated with the swabbing speed increased. Following clearing of the pump discharge water in the final pumping, the well will be pumped at the submersible pump's maximum pump rate of 30 minutes. All discharge water will be pumped into 55-gallon drums and contained on-site until an analysis of the groundwater has been completed. if the water is free of contaminants the water will be discharged to the storm sewer. If contamination is present, the water will be disposed of off-site at the Chemical Waste Management facility at Kettleman Hills. Groundwater Sampling Groundwater samples will be collected from both wells immediately following development. One groundwater sample will be collected from each of the wells in two 40 ml VOA vials. Samples will be obtained at a depth equal to the screening interval of the well using a point source bailer. Following collection, each sample will be labeled, logged on a Sample Management/Chain of Custody form and stored on ice. Prior to development and sampling of each well, all development and sampling equipment will be cleaned in a solution of liquinox organic cleaner and rinsed in deionized water, and allowed to air dry. Laboratory Analysis All samples will be delivered within 24 hours to California Water laboratory (State Certification #130) in Modesto, California. Samples collected during this round of sampling will be analyzed for chlorinated hydrocarbons (EPA Method 601) and BTXE (EPA Method 602). Along with normal laboratory quality control measures, at least 10 percent spike and 10 percent duplicate samples will be run with each analysis set for quality assurance and quality control. A sample blank obtained by passing deionized water through a cleaned bailer will also be analyzed to verify on-site decontamination procedures.