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� I Mr Chuck Carmel i August 15, 1994 Page 3 groundwater is to the city industrial sewer system under Wastewater Discharge Permit No 151 issued by the City of Lodi Public Works Department Installation and start-up of the GWETS occurred in October 1992 The GWETS was shut down on April 19, 1993, due to nondetectable concentrations of hydrocarbons in the water 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-B uck-H asstec h 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 90 to 93 percent of the time at 69 to 85 cfm during 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 first 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 Use or disclosure of data contained on this sheet Ls subject to the restriction specified at the beginning of this document 131MREPORTS11Sr94QTR RPT I