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ilaorporadon <br /> , North Market Boulevard <br /> Sacramento, CA 95834-1943 <br /> Tel. 916.928.3300 <br /> Fax. 916.928.3341 <br /> the(t Agroup <br /> A Member of The IT Croup <br /> s� <br /> April 13, 2000 In LEd <br /> Project 880-038.1B RIF, <br /> Mr. Phillip Isorena APR 14 2000 1tiU�" <br /> Regional Water Quality Control Board ENVIRONMt VITAL HEALTH <br /> Central Valley Region PERMIT/SERVICES <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Re: Proposed Soil Excavation and Aeration Activities <br /> Tesoro Fuel Terminal <br /> 3003 Navy Drive <br /> Stockton, CA 95206 <br /> Dear Mr. Isorena: <br /> IT Corporation(IT) has prepared this letter on behalf of Tesoro West Coast(Tesoro) <br /> regarding soil excavation and aeration activities proposed for the above-reference facility. <br /> On May 6, 1999, approximately 7,000 gallons of gasoline were released from the oil <br /> water separator due to a failed check valve. Emergency response activities conducted by <br /> Tesoro to remediate the release were documented in IT's June 4, 1999 letter to you. <br /> These activities included pumping product from the ground surface and three product <br /> recovery pits,pumping water and product from nearby Monitoring Well TS-10, and <br /> limited soil excavation. The purpose of this letter is to inform you of additional soil <br /> excavation and aeration activities proposed for the site to further recover residual <br /> hydrocarbons from the soil in the vicinity of the release. <br /> Soil Excavation <br /> IT will oversee excavation and removal of the vadose-zone soils that have been impacted <br /> by the spill. Determination of whether soils have been impacted by the spill will be made <br /> in the field based on organic vapor analysis and the presence of staining and/or odor. The <br /> approximate area impacted by the gasoline spill is shown on Figure 1, and is estimated to <br /> be approximately 4,800 square feet. The excavation will extend to groundwater at an <br /> approximate depth of 3 feet. A total of 240 cubic yards (yd')of impacted soil were <br /> excavated for the spill area in May 1999. It is anticipated that an additional 300 yd' of <br /> soil will be removed during this phase of work. The soil will be stockpiled on site and <br /> covered with visquene until it is removed for treatment. <br />