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'R' ,e,xs;rPr -et. <br /> "s <br /> September 13, 1991. <br /> Unocal Station No. 6981, Stockton. California <br /> slots. The well screen will extend from the total depth of the well to approximately 25 feet <br /> below grade. '11,c annular space in the well will be packed with pea gravel to a point <br /> approximately 1 foot above the slotted interval. A bentonite plug will be added above the <br /> ., sand pack to seal out cement. Thu remaining annulus will be backfilled to grade with a <br /> bentonite-cemcnt slurry. <br /> The vapor-extraction wells will be protected by a traffic-rated,cast-aluminum utility box;the <br /> same as the monitoring wells. Well construction details are presented it, the Schematic <br /> Vapor-Extraction Well Design (Appendix C). <br /> Dig osal of Soli Cuttin,s and Puree IVater <br /> drilling exhibiting subjective evidence of gasoline <br /> If possible, soil cuttings generated during <br /> hydrocarbons or producing a positive response on the PID Wel be lsepara to f rro soil se drill <br /> pies <br /> cuttings evaluated as having no gasoline live e <br /> from the drill cuttings to be composited into one soil samplle by the labara':}ry. Cuttings will <br /> be stored in a hazardous waste bin onsite until disposal at an appropriate facility. Purge <br /> - artment of Transportation intil <br /> water will be stored in 55-gallon drums approved by the Dep <br /> suitable disposal options can be selected based on laboratory <br /> analysis. We will evaluate <br /> disposal options of sail and water, apprise Unocal of the disposal options, and work with <br /> Unacal's subcontractors to remove sail and water. <br /> Va or-Extraction 'Test <br /> The VET has two objectives. (1) to collect operational data to evaluate the efficiency an <br /> practicality of vapor extraction as a soil and groundwater remediation operational Baia suggest <br /> to select the most appropriate off-gas treatment alternative., s P <br /> 15 <br /> �soaz aw <br />