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Northern Cal i f� ia Office 5075 Commerci socircle Suite A <br /> Concord , CA 94520 ( 925 ) 3 63 - 7322 Fax ( 925 ) 363 - 7275 <br /> In the future, fresh carbon will be placed in service and additional sampling and analyses for <br /> MtBE will be required to track carbon loading under these newer permit conditions. <br /> 2) The mistake in TPH method analyses was strictly an oversight on our part, as other sites <br /> we are operating on require 8020/8015/8260 methods. We collected samples in 40 milliliter <br /> VOAs, whereas method 418.1 requires 1 to 2 liters of sample. Realistically, EPA method <br /> 8015 is probably more appropriate for TPH in gasoline contaminated groundwater, as 418.1 <br /> measures heavier, less mobile oil and grease constituents. <br /> If you have any questions, please call me at 925-363-7322. <br /> Sincerely, <br /> Robert A. Dahl <br /> Project Manager <br /> cc: Ron Berberian&Joan McNabb <br /> 2021 W. March Lane, Suite 2A <br /> Stockton,CA 95204 <br /> Mike Infuma <br /> San Joaquin County EHD <br /> 304 East Weber Avenue,3`d Floor <br /> Stockton,CA 95202 <br /> William Brasher <br /> Secor International <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> James R.Dodd <br /> 247 Dorris Place <br /> Stockton,CA 95204 <br /> File: 30-0212.16.2 <br />