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Morita Brothers 17 May 6, 1992 <br /> I <br /> be extended to approximately one year The cost for in-situ vapor extraction will be <br />' approximately $80,000 <br /> Option 4 involves excavating the soil and treating the soil to non hazardous <br /> concentrations through the process of bioremediation at the subject property The <br />' proximity of the impacted soil to the surface, available space to do surface treatment, <br /> and the the relatively low concentrations of the primary chemical of concern, <br /> benzene in the soil makes this option very suitable at the site It is ESE's experience <br />' that surface treatment of gasoline impacted soil is highly successful, with a probable <br /> time frame of three to six months, and is cost effective Impacted soil currently <br /> stockpiled on-site from the tank removal and site assessment can be treated with the <br /> excavated soil ESE estimates the cost to be on the order of $55,000 to $70,000 <br /> While all of the above options are applicable to the site, ESE believes that the no <br /> action option will not be acceptable to the Regional Water Quality Control Board, and <br /> the in-situ treatment and off site disposal options are not cost effective given the <br /> shallow nature of the impacted soil and the ability to successfully treat the soil on <br />' site Therefore, ESE recommends that the soil in excess of 10 mg/kg gasoline, 0 3 <br /> mg/kg benzene and toluene, and 10 mg/kg ethylbenzene and total xylenes be <br /> excavated and treated on site by bioremediation <br />' 5 0 CLOSURE <br /> This report has been prepared for the exclusive use of Frank Morita of the Morita <br /> Brothers Service Station, as it pertains to the location of the former unleaded <br /> gasoline storage tank and dispensers at 814 Charter Way, Stockton, California The <br /> conclusions and recommendations rendered are opinions based on information <br />' obtained within the scope of work authorized by the Client It should be noted that <br /> any level of assessment cannot ascertain that a property is completely free of <br />' chemical or toxic substances Therefore, ESE cannot offer the certification of a <br /> "clean" property We believe that this is an effective program to allow an owner or <br />' prospective buyer or lender to make an informed business decision <br />' EB-8101-2 9204-EO44 RPT <br />