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GeoStrategies Inc.', <br /> January 18, 1995 <br /> Ms.' Michelle Nokes }y <br /> f Winner Ford <br /> 1650 Park Street ' <br /> .,Alameda; California <br /> Subject Quarterly Status Report <br /> Former Discovery Chevrolet, 1615 W 11th Street, Tracy, California <br /> I gn _ s w ✓W we a s ay c ;r y _ . 0 <br /> At your request, GeoStrategies (GSI) is preparing this Quarterly:Status Report-(QSR)'for <br /> ,;:the above-referenced site. This QSR is in,response to the letter.dated January:1l; 1995, . <br /> from the San Joaquin County Public Health Services (SJPHS);= This letter requested a <br /> -fourth quarter monitoring report and an,addendum to GSI's Preliminary Environmental <br /> Investigation Report (PEIR); dated,December,7,., 1994 <br /> The site is "'operating car dealershipwith service and repair bays. 'Formerly the site <br /> had two gasoline underground storage tanks (UST) in a common cavity and one waste-oil <br /> UST. The USTs-were removed in A:0611993. Soil samples collected from the base of <br /> the UST excavations indicated petroleum hydrocarbons were-present in the soil at the <br /> .' base of each:cavity:,., Gasoline:range hydrocarbons were, present at the base of the <br /> gasoline.UST cavity up to 4,400 parts per,million.(ppm) as total petroleum hydrocarbons <br /> 'as gasoline(TPHg). Theysoil sample collected from the base of the waste oil UST cavity <br /> contained TPHg'at 31 ppm and total petroleum hydrocarbons as diesel (TPHd) at 270 <br /> :ppm.' A soil sample collected from beneath a dispenser contained TPHg at 21;-ppm. All <br /> soil samples analyied Jor metals had concentrations less than their respective Total <br /> Threshold Limit Concentration (TTLC) and less than ten times the Soluble,Threshold <br /> LimitConcentration (STLC) as..noted n T.itle2,2 of;the California-Code-of Regulations -^- <br /> Based on results,;of soil-sample analyses, from the UST removal., GSI performed a <br /> preliminary site assessinent to further assess hydrocarbons in the soil and to evaluate if <br /> 'hydrocarbons'hid._impacted groundwater:beneath the site: Results of that investigation <br /> )were reported "1n the PEIR and indicated gasoline range hydrocarbons had impacted <br /> groundwater'beneath and'downgradient of the former gasoline USTs.. No impact,to the <br /> groundwater from.the waste-oil UST was indicated.. <br /> Work performed-by GSI for the site during,the fourth quarter of 1994 included evaluating <br /> the data collected•:duridg,the preliminary",environmental investigation and preparing the <br /> > . <br /> report. <br /> -6747 Sierra Court, -Suite G- Dublin CA <br /> 94568'-(516)551 87771 Fax (510)551-7888 " <br /> 3035 Prospect Park Drive, Suite 80 ,Rancho Cordova',CA 95670• (9.16).6;1-1 314•:Fax.(916)631-,1317 <br />