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fi <br /> i^ <br /> September 13. 1991 <br /> Unocal Station No. 6981, Stockton. Cali€oral, <br /> re, <br /> If no floating product is detected, the well will be developed with a surge block and pump. <br /> Well development will continue until the discharge water is clear c f silt and sand. Clay-size <br /> sediments derived from the screened portion of the formation cannot be entirely eliminated <br /> by well development. <br /> After the well has been allowed to stabilize, the well will be purged and a groundwater <br /> sample will be -.ollected for laboratory analysis. The well will be purged of approximately <br /> 3 to 5 well volumes of water with a submersible pu:ap. or until pl-1, conductivity, and <br /> temperature of the purged water have stabilized. <br /> The wells will be allowed to recover to at least 80 percent of static conditions,and a samp e <br /> of the formation water will be collected with a Teflon bailer cleaned with a laboratm-grade <br /> detergent and deionized water. The water will be transferred slowly from the bailer to <br /> Iaboratory-cleaned, 1-liter amber bottles and 40-milliliter glass vials for analyses by the <br /> laboratory. The glass vials will contain hydrochloric acid as a preservative. Our geologist <br /> will check to see if headspace is present. If headspace is present, we will collect more <br /> samples until a headspace is absent. Chain of Custody Records will be initiated in the field <br /> by the geologist, updated throughout handling of the samples. and sent along with the <br /> samples to the laboratory. Copies of Chain of Custody Records will be included in our final <br /> report. <br /> Va or-Extraction Well Construction <br /> The vapor-extraction well will be terminated at approximately 45 feet below grade and will <br /> be Constructed in the boring with thread-jointed,3-inch-or 4-inch-inner-diameter,Schedule <br /> 40 PVC casing. No chemical cements, glues, or solvents will be used in well construction. <br /> The screened portion of each well will consist of factory-perforated casing with 0.1-inch-wide <br /> w <br /> 38032-4W 14 <br />