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• r� r Mr Kyle Chnstie October 31, 1995 Page 3 1� accidental releases Because the GWETS operation has been terminated, Industnal Waste Discharge Permit No 151, that allowed discharge of the treated groundwater to the City of Lodi industnal 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 vapor phase biofilter with a design treatment flow rate of 50 cubic feet per minute (cfm) of vapor The system is currently operated under Permit-to-Operate No N-1081-1-1 issued by the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) on August 1, 1995 Source compliance data have been collected on the biofilter system since start- up on May 11, 1995 Photoionization detector (P I D ) readings and analytical data collected from the biofilter influent were presented to SJVUAPCD dunng the third quarter with the request for Permit-to-Operate No N-1081-1-1 Operating Conditions This Quarter. The SVETS operated 100 percent of the time at an average flow rate of 22 cfm during this quarter Vapors were extracted from wells V-3, V-4, V-5, V-b, 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 summanzes 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 September 18, 1995 The line of "influence" (determined as 0 1 inches of water, vacuum) is approximated by interpolating from i vacuum readings taken at each well, and adjusting for depth to the well screen Dunn-0 the third quarter of 1995, 42 pounds (7 gallons) of TPH-G were removed This represents an average removal rate of about 0 5 pounds per day for this reporting period No measurable amount of benzene was removed during the third quarter SUMMARY OF WORK Work Completed in Third Quarter 1995 • Continued monitoring SVETS and optimized Biofilter system performance • Submitted second quarter 1995 groundwater monitonng and remediation system evaluation report • Sampled site groundwater monitonng wells for third quarter 1995 Sampling performed by EMCON •� Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document 2065\REPQRT9\3RD95QTR DOC