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o Unslotted, clean 4-inch Schedule 40 PVC pipe will be installed from the <br /> ?� top of the screen to the ground surface using threaded couplings. PVC <br /> cement will not be used in order to prevent possible contaminant <br /> i� leaching from the cement. A vented cap will be placed on top of the <br /> S blank casing; <br /> s� o A gravel pack consisting of an appropriate sand or gravel will be <br /> J placed in the annulus to a depth 2 feet above the top of the well <br /> screen; <br /> i. <br /> o A 2-3 foot bentonite seal will be emplaced above the gravel pack; <br /> '.� o A 2% bentonite cement grout will be emplaced from the top of the ben- <br /> tonite seal to the ground surface; <br /> y <br /> o The well will be completed with a locking standpipe installed below <br /> grade and finally a flush mounted Christy box. <br /> 4 <br /> o The well will be developed by bailing and/or pumping until the water is <br /> ?� relativelyfree of sediment. If sur <br /> i . <br /> ging is required for development , <br /> this method will also be employed; <br /> o A rising head permeability test will be conducted during development elopment in <br /> order to calculate a horizontal permeability for the screened interval. <br /> The details of the well installation will be recorded in the field on the <br /> pre-formatted diagram shown on Plate 10. The well location will be surveyed in <br /> by measurement to landmarks appearing on Chevron's maps for the area. <br /> Soil Disposal <br /> Soil from the borings will be contained in 55 gallon drums. Arrangements <br /> for proper storage of the drums until disposal will be made in consultation with <br /> Chevron and the City of Tracy. These drums will be carefully labeled with a <br /> boring number and a depth interval. Obviously contaminated soil will be removed <br /> for off-site disposal. Samples from each drum of soil which is not obviously <br /> contaminated will be submitted for analysis for oil and grease. Samples will be <br /> submitted to Anatec Laboratories , Inc. of Santa Rosa, California. Standard <br /> JED2/H -g_ <br />