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Sent $y: RWaCB; 2553439; Jun-20-0' 7:14; Page 2/3 California Regional Water Quality Control hoard Central Valley Region Robert Schneider,Chair Winston H.titckuz Cray Davis Seerermyfur Sacramento Main Orrice Oovernur F.nvironmentn] Intcrnct Address: http://www.sm%;b.ca.gov/rwqcb5 Protection 3443 Routicr kond,Suitc.A,Sacramento,California 45827.3003 Monc(916)255-3000 FAX(916)255-301 S 20 June 2001 Mr.Ronald Nunan 1001 Broadway. 3rd Floor Millbrae,CA 94030 SUBSURFACIs`INVESTIGA7;lONREPORTRF.VIEW,FORMER TOWNAND C.DUNTRYCXF_VRON 13336 IIIGHWAY 88 FAST, LOCKEFORD,SAN JOAQUIN COUNTY Board staff reviewed the 3 May 2001 Subsurftcla Invertigatiun to Define the Lateral Extent of Hydrocarbon Constituents in Gruundwater Associated.with the Fernier Underground Storage Tankv (USTs)at the Fortner Town and Country Chevron Site Located @ 13336H 88, Lockeford, California(Investigation Report) submitted by GeoSoly,LLC(GcoSnly)on behalf of Mr.Ronald Nunan and former Town and County Chevron (Chevron). The investigation Rcport presents a summary of investigation activities completed to define the extent of soil and groundwater contamination at the subject site. In February 1998, San Joaquin County Environmental Health.Division(County)submitted a Closure Recommendation for the subject site. Bbard staff issued a leder of nonconcurrence to the County's Closure Recommendation stating that the extent bf soil and groundwater contamination was not delineated,the retraining mass of contamination was not determined,and multiple water wells at@ ipevie within 2,000 feet of the site. In June 1998,Chevron completed one sail boring near the former USTs to 100 beet,and submitted the results of this work in the 13 July 1998 ExcavatioA for one Soil Boring report(Soil Boring;Report). Multiple soil samples and one groundwater grab sample were collected for analysis. Total petroleum hydrocarbons as gasoline CrPHg;), and benzene were identified in soils from 18 to 60 feet,and the groundwater sample contained TPHg;at 210 micrograms per liter(µg;/1)and benzene bt 4.3 pg/1. GeoSoly submitted a mass balance as part of the Soil Boring Report,and stated that 67,812 kilograms of TPF-Ig (149,186 pounds or 22,950 gallons of gasoline at 6.5 pounds per gallon),and 895 kilograms(1,969 pdunds)of benzene remain in soil. Based on this information,Board sluff requested Chevron to submit a plan cif 4uork to determine the extent of groundwater contamination. In December 1998,Board staff issued a California Water Code,Section 13267 Order requiring;Chevron to complete a soil and groundwater investigation, sample the two nearby Lockeford water supply wells for contamination,and initiate a quarterly gt'oundwater monitoring and sampling program. The results of this sampling and investigation work were to be submitted in a report to the Regional Board by 27 March 1999. The required submittal date was not met. On 2 October 2000,Chevron submitted.a plan of work to cQmplcic soil and groundwater aSscssment,and the County approved the plan of work on 1 Novembcr 2000. In February 2001, three borings were completed to a Califorleia Environmental Protection Agency Necycled Paper 'the energy chanenoc facing California ii real. Every Califnmian needs to take i=icdiate action to rcduce cncrgy consunPLicm. For a list of simple ways you can reduce tlerrmd and out your energy uuslss,see our Web-bite at'htrp://www,swrcb.c.a.gov/rwqcb5