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Mr. Kyle Christie January 11, 1995 Page 3 Description. The remediation system at ARCO Facility 434 consists of a groundwater extraction and treatment system (GWETS) and soil vapor extraction and treatment system (SVETS). 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 GWETS consists of one groundwater extraction well (E-1) with a designed pumping capacity of one gallon per minute. When the GWETS was in operation, treatment of the extracted groundwater was accomplished with two granular activated carbon (GAC) vessels, each having 1,000-pound capacity. The GAC vessels have been removed for use at another ARCO facility. Groundwater was extracted from the well via a submersible pump. Discharge of the treated groundwater was to the City industrial sewer system under Wastewater Discharge Permit No. 1.51 issued by the City of Lodi Public Works Department. Because the GWETS operation has been terminated, the Industrial Waste Discharge Permit issued by the City of Lodi has been suspended. 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 coniposed 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 (SJVUAPCD). In addition, a slip stream or soil vapor is treated by a biofilter system consisting of a humidifier and a contact chamber. 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 SVETS operated 96 percent of the time at 62 to 63 cfm during this quarter. The system was down for four days due to inclement weather. Vapors were extracted from wells VE-3 and VE-4. Results and Discussion. The current, historical, and total concentrations of BTEX and TPH-G 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. Vapor samples were collected from each of the individual wells during the third quarter of 1994. The soil vapor laboratory reports and chain-of-custody documentation are included in Exhibit B. Influent concentrations of TPH-G are steadily declining, and are nondetectable in wells V-1 and V-5, which indicates the hydrocarbons are being successfully remediated. During the third quarter 495 pounds of TPH (average is 5.38 pounds per day) were removed and no Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document. 131 MREPORTSl3RD94QTR.RPr