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LFR Inc. • Install a network of a 22 injection wells screened in the A zone to cut off the groundwater plume immediately upgradient from the Bank of Stockton. • Inject approximately 15,000 gallons of food-grade emulsified vegetable oil into the 22 injection wells to create an ERD barrier to accelerate the remediation of the A-zone aquifer in the vicinity of the Bank of Stockton. • Install six additional groundwater monitoring wells to augment the existing network of monitoring wells. • Implement a groundwater sampling program for the A zone to monitor the placement of emulsified oil and the performance of the ERD barrier. • Implement a groundwater monitoring program for the B zone to evaluate the natural attenuation of Hazardous Substances and assess the need for implementing an ERD remedy in this groundwater zone. Additional details regarding the design, construction, and operation of the proposed Phase V IRA systems are discussed in Sections 4.0 and 5.0. 2.0 BACKGROUND 2.1 Historical Site Use Lincoln Center is a commercial property located in Stockton, California (Figure 1). Portions of the property occupied by Lincoln Center are currently owned by Lincoln Properties, Ltd. (LPL), and the remainder is owned by Metro Properties ("the Fahn property"; Figure 2). Since the late 1950s, several dry cleaning businesses have operated at Lincoln Center at various times from three different storefronts (Figure 2). Past dry cleaning and waste handling practices included the customary and standard disposal of wastewater containing dissolved dry cleaning fluids into the sanitary sewer lines connected to each of the facilities. In addition, dry cleaning solvent spills were documented as having entered the sanitary sewer. Such waste disposal practices reportedly are no longer used at the two dry cleaning facilities currently operating at Lincoln Center (Park Woods Cleaners [formerly Finest Care Cleaners] and Village Cleaners [formerly Lincoln Village Cleaners]). The historical waste disposal practices and documented spills discussed above have resulted in the contamination of soil and groundwater beneath the Site. Hazardous Substances appear to have migrated downward to groundwater beneath each of the former dry cleaning facilities and beneath the sanitary sewer lines, through leaks and cracks in the sewer lines serving the former dry cleaning facilities. The predominant Hazardous Substance in soil and groundwater at the Site is PCE. In addition, three gasoline service stations are or were located at Lincoln Center. A service station formerly operated by Exxon (previously Wickland Oil and Regal; Figure 2) is located on the northwestern comer of Douglas Road and Pacific Avenue. Page 4 wp-PhV_1RA-Sep07-Final-06750.dm:lfr