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l a Mr. Kyle Christie April 4, 1995 Page 3 contamination, or the use of a permanent marking pen on the sample bottle. However, the exact cause of toluene on September 28, 1994, and benzene on December 19, 1994 in the sample from W-5, is unknown at this time. The presence (or absence) of hydrocarbons in well W-5 will be verified in future quarterly sampling events. Samples for replaced well W-2 indicated nondetectable concentrations of TPH-G and BTEX. The results are shown in Table 3. The complete laboratory report is included in Exhibit A. Status of Site Remediation This section provides a description of the remediation system and discusses the effectiveness of the remediation system operation. 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 groundwater. The GWETS consists of one groundwater extraction well (E-1) fitted with a submersible pump 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. Discharge of the treated groundwater was to the City industrial sewer system under Wastewater Discharge Permit No. 151 issued by the City of Lodi Public Works Department. On March 28, 1994, the effluent piping from the GWETS was disconnected from the industrial sewer and the connection point was capped to prevent any accidental releases to the industrial sewer. Because the GWETS operation has been terminated, the Industrial Waste Discharge Permit issued by the City of Lodi has been suspended. The SUETS 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 connected to a King-Buck-Hastech catalytic oxidizer that has a design treatment flow rate of 100 cubic feet per minute (cfm) of 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 of soil vapor is treated by a biofilter system consisting of a humidifier and a contact chamber. Operating Conditions This Quarter. The SVETS operated 97 percent of the time at an average of 62 cfm during this quarter. The system was down for three days due to minor • Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document. 131ST MRT"TH94QM1Z7r