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Page 2,Apache PhkStiLIS 3rd QtW[ir.r chosen as the primary system components Authority to Construct (ATC) the system was granted by the San Joaquin Valley Unified Air Pollution Control District(SJVUAPCD) in May 1994 and the system was installed in June 1994 Upgradient was retained to monitor and report on the operation of the system in accordance with requirements in the ATC The vapor extraction system (VES) start-up and first three months of operation are discussed in the following section A copy of the ATC is presented in Appendix A ' 3.0 VAPOR EXTRACTION SYSTEM DESIGN OPERATION,AND MONITORING 3.1 Vapor Extraction System Design and Operation The VES utilizes a 34-foot-deep well and a 66-foot-deep well, which were drilled side-by-side by RSI and were together designated VEW-1 Both wells were installed using unscreened 2-inch-diameter PVC pipe, open at the bottom for vapor entry The shallow well was bottomed in the horizon where the most contamination had been detected and the deep well was bottomed where hydrocarbon levels appeared to increase Just above the water table ' The VES at the site utilizes a VR Systems internal combustion engine with catalytic converter and associated filters, controls and piping Natural gas is used to supplement the gasoline vapor extracted from the ground and is controlled by an on-board computer The VES is intended to operate 24 hours a day approximately six days per week, with one day for maintenance Initially a 110-cubic-inch(I800ec) displacement V2B engine was put into operation on July 1, 1994 After start-up on June 30, the V2B operated for three days until the computer malfunctioned and ' needed replacement Operation resumed on July 5, and with consent from Mr Richard Smith of the SJVUAPCD, the unit operated until July 7 to establish a continuous flow of air and reduce the percentage of non-combustible gasses in the vapor stream before baseline samples were collected During this period, the unit operated erratically and exhaust temperature fluctuated widely, apparently due to variations in the composition and-BTUs of the vapor Sample ports were installed between both well heads and the engine and in the exhaust stack, and a second catalytic converter was installed in the exhaust stack to increase the combustion efficiency From July 7 through July 19,the unit operated intenriittently, averaging between 14 and 15 hours per day Air flow rates fluctuated and were lower than expected during this period and supplemental fuel consumption was higher than expected, apparently due to a combination of engine inefficiency and problems with the wells Dunng the,next several days, the well vacuum was increased in'an - attempt to increase the flow rate and the system operated continuously until oil consumption became excessive and the unit was taken out of service on July 25 k From July 25 to August 22, the V2B was under repair at the VR Systems facility and no extraction