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City of Stockton TL 394-0028-02 <br /> March 10, 1994 Page 9 <br /> least one gallon of water for every bucket of pellets . The <br /> thickness of the bentonite seal may depend upon local regulatory <br /> requirements . <br /> The remainder of the well annulus will be sealed with a 6-sack <br /> sand-cement, or cement grout slurry containing 3 to 5 percent <br /> bentonite. For wells more than 15 feet deep, the seal will be <br /> emplaced through the hollow augers, which will extend to within 15 <br /> feet of the bentonite seal. If required by the local regulatory <br /> agency, the seal will be emplaced by pumping through a tremie pipe <br /> which extends to within 15 feet of the bottom of the boring. The <br /> tremie pipe or augers are withdrawn from the boring in 5-foot <br /> increments as the boring fills with grout. A 3-foot steel <br /> standpipe with locking cover or a traffic-rated box will be <br /> installed around each wellhead. Gas probes will be locked to <br /> restrict access to unauthorized personnel . <br /> Gas probe construction details will be recorded on the field well <br /> construction form. Construction information will be transferred to <br /> Soil gas probe construction schematics for presentation in final <br /> reports. <br /> A-4 Decontamination Rinsate and Soil Cuttings Disposal: The soil <br /> cuttings generated by drilling operations will be retained on site, <br /> and either covered by plastic sheeting or containerized in <br /> Department of Transportation-approved drums . The drilling <br /> equipment will be steam-cleaned on racks, and the rinsate will be <br /> retained in a steel trough, and then transferred to drums . Water <br /> purged from monitoring wells will be containerized in drums if <br /> contamination is known or suspected. Drums containing soil, <br /> rinsate, and purged water will be sealed and temporarily stored on <br /> site at a location remote to the public. Each drum will be <br /> labelled to identify its contents. Disposal of these wastes will <br /> be the responsibility of the client. The client will be informed <br /> that the wastes must be disposed in accordance with applicable <br /> Federal, State, and local regulations. <br />