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California Renal Water Quality Ctyfitrol Board '` Central Valley Region Robert Schneider,Chair Winston H.Hickox Gray Davis Secretaryfor Sacramento Main Office Governor Environmental Internet Address: http:/Ywww.swrcb.ca.gov/rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 28 August 2001 415t 933 -23 CS' Mr.Ronald Nunan 1001 Broadway, Yd Floor OeV Millbrae, CA 94030 lA f, COMPLETION OF 13267 ORDER REQUIREMENTS, FORMER TOWN AND COUNTRY CHEVRON 13336 HIGHWAY 88 EAST,LOCKEFORD,SAN JOA QUIN COUNTY Board staff reviewed the 3 May 2001 Subsurface Investigation to Def ne the Lateral Extent of Hydrocarbon Constituents in Groundwater Associated with the Former Underground Storage Tanks (USTs) at the Former Town and Country Chevron Site Located @ 13336 Hwy 88, Lockeford, California (Investigation Report) and the 26 July 2001 Groundwater Monitoring Report(QMR)both submitted by GeoSoly,LLC (GeoSoly) on behalf of Mr.Nunan and former Town and County Chevron(Chevron). The Investigation Report presents a summary of activities completed to define the extent of soil and groundwater contamination at the subject site, and the QMR presents confirmation sampling of the three existing monitoring wells for the second quarter of 2001. In February 1998, San Joaquin County Environmental Health Division (County) submitted a Closure Recommendation to the Regional Board for the subject site. Board staff issued a letter of nonconcurrence to the County's Closure Recommendation stating that the extent of soil and groundwater contamination was not delineated,the remaining mass of contamination was not determined, and multiple water wells were identified within 2,000 feet of the site. In June 1998, Chevron identified soil and groundwater contamination in one soil boring near the former USTs, and Board staff requested Chevron to submit a plan of work to determine the extent of contamination. Based on Chevron's non-compliance with this directive,Board staff issued a California Water Code Section 13267 Order in December 1998 requiring Chevron to complete a soil and groundwater investigation, sample the two nearby Lockeford water supply wells for contamination,initiate a quarterly groundwater monitoring and sampling program, and report the results of this sampling and investigation work to the Regional Board by 27 March 1999. The required submittal date was not met. Board staff contacted Mr.Nunan on 10 August 2000 to request completion of site work, and we were notified that Mr.Nunan had started the State Board petition process, and would wait on the outcome of the petition prior to completing additional work. On 2 October 2000,Chevron submitted a plan of work to complete the soil and groundwater assessment, and the County approved the plan of work on 1 November 2000. In February 2001, three borings were completed to a maximum depth of 120 feet on the subject property and converted to monitoring wells. Soil contamination was identified down to 36 feet, and low.concentrations of toluene were identified in soils down to 99 feet, the total depth of soil sampling. The maximum concentration of toluene in soil from 36 to 99 feet in the three monitoring well borings is 0.093 mg/kg identified in MW-2 at 45.5 to 46 feet. The maximum concentration of benzene in California Environmental Protection Agency ca Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at bttp://www.swrcb,ca.gov/rwgcb5