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3164 Gold Camp Drive <br /> ui� Suite 200 <br /> ,Q i Rancho Cordova CA 95670-6021 <br /> S E P 3 1 t t 1 2 0 U 5 A <br /> Consultants,Inc 916/638-2085 <br /> FAX 9161638-8385 <br /> August 28, 2001 <br /> Ms Margaret Lagono <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Status Report, Second Quarter 2001 <br /> Atlantic Richfield Company Facility No 6100 <br /> 25775 Patterson Pass Road <br /> Tracy, California <br /> Delta Project No D000-340 <br /> Dear Ms Lagono <br /> On behalf of Atlantic Richfield Company (ARCO), Delta Environmental Consultants, <br /> Inc (Delta) has prepared this status report to summarize work activities conducted at <br /> ARCO Facility No 6100, located at 25775 Patterson Pass Road, Tracy, California <br /> (Figure 1) during the second quarter 2001 <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 USTs were present at the site The waste oil tank <br /> was removed in 1987 From November 1990 to February 1991, the five USTs and <br /> associated product delivery lines were removed and replaced with four 10,000-gallon <br /> USTs <br /> Soil investigations were conducted between 1991 and 1995 Concentrations of total <br /> petroleum hydrocarbons as gasoline (TPHG) and benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX) were detected in soil from 6 to 115 feet bgs, with the highest <br /> concentrations identified at approximately 26 to 45 feet below ground surface (bgs) A <br /> Providing a Competitive Edge <br />