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Station No. 502, 35 N. Cherokee Lane, Lodi , - Interim Remediation Plan Performance Test/Feasibility Study A Performance Test was conducted concurrently to determine the feasibility of using vacuum extraction at this site. The performance test simulates operating characteristics of a vacuum extraction system using temporary vacuum connections to the existing monitoring wells. Extraction volumes from the wells ranged from 14.0 to 20.0 standard cubic feet , per minute (scfm) . The applied vacuums ranged from 2.0 to 4.5 inches of mercury. Influence vacuums ranged from 0.01 to >0.25 inches of water. Depth to groundwater at the time of the study ranged from 51.55 to 52.60 feet. Favorable influence was measured at a distance of 55 feet. The results of the performance test indicated that soil conditions are suitable to remediation using vacuum extraction. INITIAL PHASE OF REMEDIATION A successful vapor extraction system comprised of five vapor recovery wells (VW-5, VW-6, VW-7, VW-9) and two monitoring wells (MW-2 and MW-4) L operated at this site from 11 October 1989 to 8 November 1989. An internal combustion engine was used for vapor abatement during this period. The unit operated continuously 24 hours per day. Approximately 1,695 pounds of hydrocarbons were removed from the soil during this operation. Influent hydrocarbon concentrations decreased 89% from a start-up condition of 22,500 ppm to 2,500 ppm at the final monitoring. Data from this phase of remediation is summarized in Table II and also in Appendix B. TABLE II - INITIAL AND FINAL VAPOR CONCENTRATIONS Sail Vapor Extraction System Beacon Station #502 35 North Cherokee. Lane, Lodi 11 October to 8 November 1989 Extraction Hydrocarbon Vapor_ Concentration.,,(pnmvZ Point Initial (10/11/89) Final (11/08/89) tMW-2 19,000 55 VW-6 5,000 50 VW-7 11,000 550 MW-4 21,000 57 VW-8 23,000 3,475 VW-9 20,000 2,800 System Total 22,500 2,500 - 3 -