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1 <br /> Emcon <br /> 1433 North Market Boulevard .Sacramento Calrfarnia 95834-1943 • (916)928-3300• Fax(916)928-3341 <br /> I p r <br /> ' <br /> August 4 1995 <br /> AUG 7-105Project 0805-152 02 <br /> Mr Kyle Christie EiEN "NJV� N� ATN <br /> ARCO Products Company r �fT/SERVICES <br /> 2155 South Bascom, Suite 202 <br /> Campbell, California 95008 <br /> Re: Second Quarter 1995 Status Report for ARCO Service Station No 6100 Located at <br /> 25775 South Patterson Pass Road, Tracy, California <br /> Dear Mr Christie <br /> At the request of ARCO Products Company(ARCO), EMCON is presenting this status report <br /> for work conducted during the second quarter 1995 at the subject site (see Figure 1) Work <br /> included conducting a supplemental subsurface investigation The subsurface investigation <br /> consisted of drilling three off-site soil borings and converting the borings into vapor <br />�y extraction wells The purpose of this investigation was to further characterize sort <br /> southeast of the site and to provide vapor extraction coverage in that area <br /> PREVIOUS WORK <br /> In June 1990, at the request of ARCO, RESNA Industries (RESNA [formerly Applied <br /> GeoSystems]) observed drilling of five soil borings (B-1 through B-5) at the site (Applied <br /> GeoSystems, July 16, 1990, Report No 30041-1) Gasoline hydrocarbons were detected in <br /> soil samples collected from the bonngs <br /> Roux Associates (Roux) conducted an investigation from November 1990 to February <br /> 1991 in conjunction with the removal of five underground storage tanks (USTs) and <br /> associated product delivery lines (Roux, May 29, 1991, Report No AR06776W) The <br /> presence of hydrocarbons in soil within the tank cavity necessitated the excavation of the <br /> cavity to depths ranging from 15 to 25 feet below ground surface (bgs) Soil samples <br /> collected from the limits of the overexcavated tank cavity contained concentrations of total <br /> petroleum hydrocarbons as gasoline (TPHG) up to 7,400 parts per million (ppm) Four <br /> new tanks were installed in the new tank cavity <br /> In October and November 1991 and June 1992, RESNA observed drilling of 20 soil <br /> borings (B-6 through B-25) and construction of 15 vapor extraction wells Residual <br />. gasoline hydrocarbons were detected in soil beneath the dispenser islands, between the <br /> sACNN XPIM805UO51520 2BS-951pas i <br />