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V Mr Kyle Christie August 24, 1995 Page 4 • Wastewater Discharge Pernut The perrrut expires December 31, 1997 The extracted groundwater does not require treatment prior to discharge (as per the requirements of the wastewater discharge permit) The system is sampled monthly to ensure that discharge is within permitted lirruts The GWES has operated nearly continuously since June 1991 Prior to this time, a free product recovery system operated at the site from 1984 to 1986 After the free product was recovered, the system was modified for use as a GWES and operated periodically from 1986 to 1991 Additional modifications were made to improve the system in 1991 The SUET/AS system consists of 14 soil vapor extraction wells (V-1 through V-12, MW-2 and E-6) and nine air sparging wells (S-1 through S-9) The soil vapor extraction wells are connected to an Airex Katox 100 catalytic oxidizer unit Construction of the SVET/AS system was completed during the last quarter of 1994 and the system was brought on line in January of 1995 The system operates under Authority-to-Construct (air) permit number N-78-3-0 issued by the San Joaquin Valley Unified Air Pollution Control District on August 1, 1994, and expiring October 1, 1996 Vapor extracted from the site is treated by the catalytic oxidizer unit which must either meet a minimum VOC destruction efficiency of 95%, or must not exceed a total VOC emission rate of 2 pounds in any one day Monthly grab samples are taken at the system influent and effluent to ensure that the conditions of the Authority-to-Construct are met Operating Conditions This Quarter During the second quarter of 1995, the GWES operated approximately 100% of the time, extracting and discharging 465,035 gallons of groundwater The total amount of BTEX and TPH-G in the extracted groundwater is shown in Table 4 The analytical results are included in Exhibit C The quantity of BTEX and TPH-G discharged to the sewer is well within the limits stated in the permit During the second quarter of 1995, the SUET/AS system operated approximately 94% of the time The system was down for 5 days due to power outages and a possible out-of- compliance situation As discussed above, monthly samples are collected to ensure that permit conditions are met The results of the May sampling event indicated a possible out-of- compliance situation (less than 95 percent hydrocarbon destruction efficiency) Upon receipt of the sample results, the system was immediately resampled and then shut down Results of the resampling indicated that the system was in compliance A manufacturer's representative examined the system and verified that it was operating within permitted conditions, and the system was restarted Subsequent sampling events indicate that the system continues to operate within permitted conditions Analytical reports for the compliance testing are included as Exhibit C A vapor influence study was conducted during May to optimize the performance of the system During the study, photo-ionization detector (PID) readings, vapor samples and vacuum influence data were collected from selected soil vapor extraction wells In addition, dissolved oxygen readings were collected from selected groundwater monitoring wells Based • Use or disclosure of data contained on this sheet is subject to the restriction specified of the beginning of this do cunient 20694W"RTS\2YD95QTR RFT