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Pale 3,Apache Planus ,,IJ Qeta nc, 16 unit was present at the site Because of continued problems with the V2B, it was temporarily replaced with a 460-cubic-inch displacement V3 engine using similar peripheral components on August 22 The V3 operated almost continuously until August 30 The well vacuum was two to three Mmes what it had been during operation of the V2B, flow rates averaged approximately 70% ' higher, and the exhaust temperature averaged 60-70% lower (lower temperatures are characteristic of V8 engines) The higher flow rate and high vacuum loosened the sand pack at the bottom of the deep well, and sand grains became clogged in the ball valve at the well head, preventing measurement of vapor concentration when the wells were monitored on August 24 Probably due to lower exhaust temperatures,PID concentrations measured at the exhaust port were 5 to 30 ' times higher than had been measured during operation of the V2B During September the well vacuum was increased to over 200 inches of water in an attempt to increase the flow rate However, the average flow rate decreased nearly 10 cfm during the month The average daily flow rate of 33-37 cfm was far below the rated capacity of the unit, suggesting ' that the wells were plugged, the soil has low permeability, or both On September 24, a cooling system failure shut the system down The VES did not operate for the ' remainder of the third quarter of 1994 Well completion diagrams and specifications of the IC engines are presented in Appendix B 3.2 Vapor Extraction System Monitoring Monitoring of the VES consists of manual monitoringLof the vapor stream as required by the ATC ' and automatic monitoring of the IC engine performance by the on-board computer, which creates a digital and printed record of operation Manual monitoring of the vapor stream included start-up ' and quarterly collection of samples of the influent(soil gas)to the IC unit and effluent(combustion products) for laboratory analysis for TPH and BTEX compounds and weekly field monitoring of the TPH concentrations in the influent and effluent using a SJVUAPCD approved device The ' manual monitoring is performed to assess whether the effluent is in compliance with the requirements of the ATC Manual monitoring using a Photovac microTlP photo-ionization detector calibrated to isobutylene )vas conducted weekly when the VES was in operation Due to the system configuration and high ' vacuum produced by the engine, the influent stream is monitored at the individual well heads of the shallow and deep vapor extraction wells Start-up samples for laboratory analysis were initially collected on July 7, 1994 and were collected again on August 24, 1994 in conjunction with the start-up of the temporary replacement engine Both sets were sent to Matrix Environmental Laboratories of Rancho Cordova Due to discrepancies within the laboratory analytical results and with the field monitoring results, samples i i J