COMPLIANCE INFO_1993-1994 - Laserfiche WebLink

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City of Stockton TL 394-0027-02 March 10, 1994 Page 9 bentonite seal may depend upon local regulatory requirements. The remainder of the well annulus will be sealed with a 6-sack sand-cement, or cement grout slurry containing 3 to 5 percent bentonite. For wells more than 15 feet deep, the seal will be emplaced through the hollow augers, which will extend to within 15 feet of the bentonite seal. If required by the local regulatory agency, the seal will be emplaced by pumping through a tremie pipe which extends to within 15 feet of the bottom of the boring. The tremie pipe or augers are withdrawn from the boring in 5-foot increments as the boring fills with grout. A 3-foot steel standpipe with locking cover or a traffic-rated box will be installed around each wellhead. Gas probes will be locked to restrict access to unauthorized personnel. Gas probe construction details will be recorded on the field well construction form. Construction information will be transferred to Soil gas probe construction schematics for presentation in final reports . A-4 Decontamination Rinsate and Soil Cuttings Disposal: The soil cuttings generated by drilling operations will be retained on site, and either covered by plastic sheeting or containerized in Department of Transportation-approved drums. The drilling equipment will be steam-cleaned on racks, and the rinsate will be retained in a steel trough, and then transferred to drums. Water purged from monitoring wells will be containerized in drums if contamination is known or suspected. Drums containing soil, rinsate, and purged water will be sealed and temporarily stored on site at a location remote to the public. Each drum will be labelled to identify its contents. Disposal of these wastes will be the responsibility of the client. The client will be informed that the wastes must be disposed in accordance with applicable Federal, State, and local regulations .