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%Awl <br /> riaInc . <br /> An Environmental Services Company <br /> November 24, 1989 <br /> r <br /> Mr. Thomas Peltier, Engineering Geologist <br /> Underground Tank Support Group <br /> «y Central Valley Regional Water <br /> Quality Control Board <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> Re: Proposal For The Bioremediation Of Hydrocarbon <br /> Contaminated Soils At Stockton Scavenger Co. , <br /> 1240 Navy Drive, Stockton, CA <br /> -� Dear Mr. Peltier: <br /> Uriah has been requested by Norcal, Inc. , the parent of the <br /> Stockton Scavenger Company, to assume responsibility for the <br /> completion of a bioremediation project involving approximately <br /> 800 cubic yards of diesel and TOG contaminated soils previously <br /> excavated subsequent to the removal of underground fuel storage <br /> tanks. <br /> While the bioremediation process begun by a previous consultant <br /> under authority of a variance granted by the California State <br /> Department of Health Services had enjoyed limited success, <br /> Norcal and Stockton Scavenger were anxious to see the project <br /> completed and so elected to change treatment from the "thin <br /> spread" format to modified windrowing. <br /> Based upon proprietary experience, information available from <br /> other commercial service providers, and considerable research <br /> data, Uriah is confident that the contaminants present within <br /> the soils of concern are subject to aerobic degradation by a <br /> variety of soil bacteria and fungi. This aerobic process would <br /> mineralize the hydrocarbon contaminants, forming the non-toxic <br /> end products carbon dioxide, water, and minerals. <br /> The windrowing process recommended has been found to be partic- <br /> ularly appropriate when dealing with soils of low permeability, <br /> contamination by heavier oils, and/or significant space <br /> .r <br /> 464 Lindbergh Avenue Livermore, California 94550 (415) 455-4991 <br /> .r <br />