SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Water Boards Central Valley Regional Water Quality Control Board TO: Case File: J &L Market FROM: James L.L. Barton, P.G. 8125 S. EI Dorado Street Engineering Geologist French Camp, San Joaquin County DATE: 8 May 2013 SIGNATURE: SUBJECT: UST CASE CLOSURE, J & L MAR T, 8125 SOUTH ELDORADO STREET, FRENCH CAMP, SAN JOAQUIN COUNTY(CASE# 390897). Site Background J & I Market (Site) is a fueling station with separately housed restaurant and convenience store located at 8125 South EI Dorado Street in French Camp, San Joaquin County (Figure 1). The station building shown next to the dispensers is currently used as an automotive repair shop. In November 1995, one 2,000-gallon gasoline and two 10,000-gallon gasoline underground storage tanks (USTs), associate piping, and dispensers were removed and replaced at the Site (Figure 2). The UST system confirmation soil samples provided evidence of an unauthorized release of petroleum hydrocarbons. Subsequently in December 1995, 3,777 yds3 of contaminated soil were over-excavated to the most practical extent at the Site (excavation stopped at the station building) and transported for disposal at REMCO in Richmond, CA. Two soil borings (JLM1 and JLM2) were advanced in in November 2001 , with additional soil borings (JLM6 through JLM11) advanced in February 2003. Monitoring wells were installed in June 2002 (JLM3 through JLM-5), in October 2004 (JLM12 through JLM15, Figure 3), in August 2005 (JLM16 through JLM19), and in October 2008 to November 2008 (JLM20 through JLM26) for a JLM-designated total of eight (8) soil borings and eighteen (18) monitoring wells. Three cone penetrometer testing (CPT1 through CPT3) borings (no soil samples) were advanced for vertical plume delineation in July 2005. In October 2009, two remediation wells (OSI and OS2) were installed. An ozone sparging pilot test was conducted from December 2009 to January 2010. Maximum results of soil borings are reported in milligrams per kilogram (mg/kg) in the following Table. Date TPHg B T E X MTBE TBA 1, 2- Pb TAME benzene toluene eth (benzene xylenes DCA 11-95 5,500 <13 55 62 460 NA NA NA 11 18 12-95 4,200 NR NR NR NR NR NR NR NR NR 11-01 1,300 0.025 0.34 7.4 33 <0.1 <10 <0.1 <10 <0.1 6-02 44 0.25 0.18 0.34 0.99 NA NA NA NA NA 10-08/11-OS <0.1 <2.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 NA <0.005 TPHg=total petroleum hydrocarbons as gasoline MTBE=methyl tert butyl ether TBA=tett butyl alcohol 1,2-DCA= 1,2-dichloroethane Pb=total lead TAME=tert amyl methyl ether NA=not analyzed 1 = UST confirmation sample NA=not analyzed 2= over-excavation confirmation samples NR= report missing from file;TPHg data value from file(staff letter) KAR, E. LorvcLev ScD, P.E. morin I PAMELA G. CREEDON P.E. 3CEE, E.Ecunve OFSICEP 11020 Sun Center Drive#200, Rancno Cordova,CA 9561D www waterboaroe ca.9ownentralvMley