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r, r, Mr Kyle Chnstie August 4, 1995 Page 3 • Description. The remediation system at ARCO Facility 434 consists of a soil vapor extraction and treatment system (SVETS) A ground water extraction and treatment system (GWETS) which was formerly in use at the site, was shut down on April 19, 1993, due to nondetectable concentrations of hydrocarbons in the groundwater The GAC vessels have been removed for use at another ARCO facility, and the effluent piping from the GWETS to the industrial sewer was disconnected The connection point to the industrial sewer was capped to prevent any accidental releases Because the GWETS operation has been terminated, Industrial Waste Discharge Permit No 151, that allowed discharge of the treated groundwater to the City of Lodi industrial sewer, has been suspended The SVETS consists of eight soil vapor extraction wells (VE-1 through VE-8) and a soil vapor treatment system The soil vapor treatment system is composed of a vacuum compressor pump connected to a bio-remediation filter with a design treatment flow rate of 100 cubic feet per minute (cfm) of vapor The system is currently operated under Authority To Construct No N-1081-1-1 issued by San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Source compliance data has been collected on the biofilter system since start-up on May 11, 1995 The P I D readings and analytical data collected will be presented to SJVUAPCD during the third quarter with a request for a Permit To Operate Operating Conditions This Quarter. The SVETS operated 79 percent of the time at an average flow rate of 28 cfm during this quarter The system was down for 22 days while the catalytic oxidizer was taken off-line and replaced with a biofilter system Vapors were • extracted from wells V-3, V-4, and V-6 through June 21, 1995 Beginning June 21, 1995 vapors were extracted from wells V-3, V-4, V-5, V-6, V-7, and V-8 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 soil vapor extraction wells and analytical results from the individual wells Figure 3 represents the inferred vacuum across the site as provided by measurements taken on June 21, 1995 The line of "influence" (deterruned as 0 1 inches of water, vacuum) is approximated by interpolating from vacuum readings taken at each well, and adjusting for depth to the well screen Influent concentrations of TPH-G and benzene are generally declining, which indicates the hydrocarbon impacted soils beneath the site are being successfully remediated During the second quarter of 1995, 37 pounds (6 gallons) of TPH-G were removed This represents an average removal rate of less than one pound per day for this reporting period No measurable amount of benzene was removed during the second quarter Recommendations and Changes in Sampling Frequency All system modifications suggested in the first quarterly monitoring report have been completed The SVETS now consists of a biofilter remediation system for extraction and treatment of soil vapors We recommend continued monitoring of the system on a monthly basis and continued soil vapor extraction well optimization on a quarterly basis Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document 2065\REPORTS%2ND95QTR RPT