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Mr. Harlin Knoll, SJCEHD April 7,2006 Work Plan for Confirmation Soil Borings Project No.2007-0065-01 USA Station No.65,Lodi, California Page 2 SITE DESCRIPTION The site is currently an active service station situated on the southwest corner of the intersection of West Lodi Avenue and Lower Sacramento Road. Aboveground facilities consist of a station building containing a convenience store, four dispenser islands, and a car wash building. Two 12,000-gallon and one 6,000-gallon underground storage tanks (USTs) used to store gasoline, and one 6,000-gallon UST used to store diesel fuel, are situated in the central portion of the property, immediately north of the dispenser islands. The general configuration of the facility is shown on Figure 2. BACKGROUND Information provided in this section is based on reports generated by Pinnacle Environmental Solutions, Inc. (Pinnacle), a division of EMCON, and work completed by Stratus. Table 1 presents a summary of soil boring and well installation activities completed at the site. Petroleum hydrocarbon impact to soil and groundwater was reported during a limited subsurface investigation completed in March 1987. The investigation included the drilling and sampling of four soil borings, two of which were completed as groundwater monitoring wells (S-1 and S-2). In August 1987, three additional groundwater monitoring wells (MW-1, MW-2, and MW-3) were installed. Additional monitoring wells (MW-4 through MW-8) were installed between 1989 and 1993 to assess the lateral extent of petroleum hydrocarbon impact to groundwater. Well locations are depicted on Figure 2. Three gasoline USTs and associated piping were removed and replaced on October 6 and 7, 1997. Approximately 500 cubic yards of hydrocarbon-impacted soil were excavated and removed from the site during these activities. Pinnacle prepared and submitted a Remedial Action Plan (RAP) in January 1999. The RAP recommended the construction, installation, and operation of a soil vapor extraction (SVE) and air sparge (AS) system to mitigate the petroleum hydrocarbon impact to soil and groundwater. On May 4 and 5, 2000, Stratus supervised the installation of two groundwater monitoring wells (MW-9 and MW-10) and one air sparge well (AS-1) in the vicinity of the active pump islands. Stratus also directed the installation of vapor extraction well VW-1 on May 2, 2001. Monitoring well MW-5, located in the shoulder of Lower Sacramento Road, was abandoned on May 5, 2000, at the request of City of Lodi, due to a proposed widening of Lower Sacramento Road. KAUSA Gasoline100651Workplanslusa65-boring-ept-workplan.doc OMATu5