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Mr Chuck Carmel September 7, 1994 . Page 3 The SVETS consists of eight soil vapor extraction wells (VE-1, VE-2, VE-3, VE-4, VE-5, VE-6, VE-7 and VE-8) and a soil vapor treatment system The soil vapor treatment system is composed of a vacuum compressor pump followed by a King-Buck-Hasstech catalytic oxidizer that has a design treatment flow rate of 100 cubic feet per minute (cfm) of soil vapor The system is operated under Permit to Operate No N-1081-1-0 issued by San Joaquin Valley Unified Air Pollution Control District Operating Conditions This Quarter Due to nondetectable concentrations in all monitoring wells since May 1993, the effluent piping from the GWETS was disconnected from the industrial sewer on March 28, 1994, and the connection point was capped to prevent any accidental releases to the industrial sewer The Industrial Waste Discharge Permit issued by the City of Lodi has been suspended The SVETS operated 91 to 100 percent of the time at 61 to 68 cfm dunng this quarter Vapors were extracted from wells VE-3 and VE-4 Results and Discussion The current, historical, and total concentrations of BTEX and TPH in the extracted soil vapor are shown in Table 4 Table 5 summarizes the status of the vapor . extraction wells and analytical results from the individual wells No vapor samples were collected from the individual wells during the second quarter of 1994 The soil vapor laboratory reports and chain-of-custody documentation are included in Exhibit B Influent concentrations of TPH-G appear to be steadily declining, indicating that the hydrocarbons are being successfully remediated The SVETS will continue to be operated in a manner designed to remediate soil and soil vapors effectively and quickly by • Concentrating extraction from areas with highest concentrations in vapor, as monitored by field instruments and periodic laboratory analyses of air samples • Maximizing influent concentration to the catalytic oxidizer Influent air samples are collected monthly and used to evaluate this criteria Recommendations Based on the operation of the SVETS during the second quarter of 1994, the SVETS will continue to operate However, Brown and Caldwell proposes that due to the decline in soil vapor influent concentrations to the catalytic oxidizer and the lack of groundwater contamination at the site, the biofniter system be permitted to remediate the remaining low soil vapor concentrations at the site As shown in Figure 2, influent concentrations have declined Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document t 3181RP P0P T Y2M 94 Q-rR,R PT