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I <br /> i <br /> Delta <br /> Environmental <br /> ��. Consultants, Inc. <br /> 3330 Data Drive <br /> Rancho Cordova, CA 95670 <br /> 916/638-2085 <br /> FAX:916/638-8385 <br />_ I <br /> I <br /> i <br /> February 19, 1990 <br /> R E, E <br /> ! <br /> 1� <br /> Mr. Harlin Knoll F1E$ 2 ;2 <br /> Environmental Health Division ENVIRQ�NMENTAL HEALTH <br /> San Joaquin Local Health District <br /> County of San Joaquin PERMIT/SERVICES <br /> 1601 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Subject: Soil and Ground Water Management Plan for the Underground j <br /> Tank Replacement Project <br /> Shell Service Station <br /> 3725 Tracy Boulevard, Tracy, California <br /> Delta Project No. 40-89-012 <br /> Dear Mr. Knoll: <br /> Delta Environmental Consultants, Inc. (Delta), has been authorized by Shell Oil Company (Shell) to <br /> assist with the removal of three existing underground gasoline storage tanks and associated product piping, <br /> and the installation of four new tanks at the subject site. Shell has scheduled the work to begin on <br /> March 1, 1990. <br /> On December 4, 1989, Delta submitted a Pretank-Closure Site Assessment Report to,the San Joaquin <br /> Local Health District (County). That report recommended that samples be collected fr'o' m soil stockpiles <br /> excavated during renovation of the site and be submitted for chemical analyses in order to designate <br /> disposal. The report also recommended that water derived from the dewatering of the new tank <br /> excavation be discharged to the City of Tracy sanitary sewer. The purpose of this letter is to provide a <br /> plan for the management of the soil generated and the ground water discharg4 during the tank <br /> replacement activities. This letter also describes the soil sampling procedures that will be performed <br /> within the old and new tank excavations and product distribution line trenches. <br /> F <br /> Background Information I# <br /> 1989 soil borings were advanced and monitoring During August and September, g g wells were installed. Soil <br /> and ground water samples were collected and submitted to a State-certified laboratory for analyses of <br /> benzene,toluene,ethylbenzene,and xylenes(BTEX), 1,2-dichlorocthane(EDC),ethyleneldibromide(EDB) <br /> and total purgeable petroleum hydrocarbons (TPPH). <br /> i� <br /> i <br /> I <br /> i <br /> i <br /> Practical Solutions to Environmental Concerns it <br /> ,E <br />