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r <br />Page 3 <br />Ms Margaret Lagono I All <br />r March 23, 1995 <br />An approximately 1,000 -foot -long stormwater drainage ditch extends westerly <br />from the facility to an intermittent, south -flowing drainage canal. This canal <br />empties into Duck Creek, which is located about 900 feet south of the plant <br />REMEDIAL ALTERNATIVES <br />Alternatives for the cleanup of gasoline -impacted groundwater to regulatory <br />required cleanup levels include groundwater extraction and treatment (or <br />discharge), in-situ bioremediation, and air sparging with soil vapor extraction <br />Regulatory Cleanup Levels <br />Based on the California State Water Resources Control Board Resolution #92-49 <br />under the Water Code section #13304, cleanup of impacted groundwater at this <br />site is to background conditions Clean up to this stringent requirement will require <br />an aggressive method of remediation, which Rainbo and Burlington will endeavor <br />to perform <br />The County should be aware that clean up to this standard is often impractical due <br />to unforeseen site conditions, even when utilizing the most effective and current <br />forms of remedial technologies If active remediation at the site results in <br />indications that "non-detectable" hydrocarbon concentrations in groundwater are <br />` unobtainable and that relatively low asymptotic levels can not be effectively <br />reduced, then Rambo (and Burlington) will consult with the County to evaluate <br />future actions including seeking case closure for this facility <br />Groundwater Eitraction And Treatment <br />Groundwater extraction involves the removal or pumping of impacted <br />- `ground"water frbm extraction well`s The ektracted water is processed through a <br />' treatment system and then re -infected into the aquifer or discharged into the City <br />of Stockton sanitary sewer system <br />Groundwater would be extracted from up to 3 recovery wells situated <br />downgradient to the area of impact The precise, number and spacing of the <br />extraction wells would depend on information obtained from a groundwater pump <br />test Recovery wells would be equipped with an electric submersible pump <br />operated by level controls designed to shut down should a malfunction occur <br />' I <br />I I <br />7 I I <br />II <br />I II <br />