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t <br /> 3164 Gold Camp Drive <br /> - 17 n Suite 200 <br /> Delta : <br /> Rancho Cordova,CA 95670-6021 <br /> 111116LFAX: <br /> Environmental U.S.A. <br /> 916/Consultants,Inc. 98-2085 <br /> FAX:916/638-8385 <br /> May 22, 2001 <br /> Mrs. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Ave., Third Floor <br /> Stockton, CA 95202 <br /> Subject: Work Plan for an Additional Subsurface Investigation <br /> Atlantic Richfield Company Facility No. 6100 <br /> 25775 Patterson Pass Road <br /> Tracy, California <br /> Delta Project No. D000-340 <br /> Dear Mrs. Lagorio: <br /> On behalf of Atlantic Richfield Company (ARCO), Delta Environmental Consultants, <br /> Inc. (Delta) has prepared this work plan to conduct an additional subsurface investigation <br /> at ARCO Facility No. 6100, located at 25775 Patterson Pass Road, Tracy, California <br /> (Figure 1). The purpose of the additional subsurface investigation is to characterize the <br /> hydrogeology beneath and adjacent to the site, assess the extent of liquid-phase <br /> hydrocarbons, and evaluate the extent of oxygenates in the vicinity of the underground <br /> storage tanks and fuel dispensers. This work plan presents details associated with the <br /> proposed investigation activities. <br /> SITE BACKGROUND <br /> The site is currently an active ARCO service station located at the northwestern corner of <br /> the intersection of Patterson Pass Road and Interstate 580 near Tracy, California. The <br /> facility configuration is shown on Figure 2. The site is approximately 300 feet above <br /> mean sea level (msl) with topography sloping towards the southeast. The area <br /> surrounding the property is undeveloped land. <br /> Originally, one 550-gallon waste oil underground storage tank (UST), one 10,000-gallon <br /> gasoline UST and four 6,000-gallon UST's were present at the site. The waste oil tank <br /> was removed in 1987. From November 1990 to February 1991, the five UST's and <br /> associated product delivery lines were removed. The five USTs were replaced with four <br /> 10,000-gallon UST's. <br /> Providing a Competitive Edge <br />