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IXIT Vapor Extraction Unit (Attachment B) for Firestone Store, Stockton, CA page 4 of 5 The LEL monitor will detect the VOC concentration in the process stream. Should the VOC concentration exceed a preset level, dilution air will be added to the process stream, lowering the VOC concentration. If the VOC concentration cannot be maintained under approximately 25% LEL, the system will enter a mode whereby flow from the extraction wells will cease, and ambient air will be run through the system. After a predetermined amount of time has passed, the system will begin to pull off the extraction wells once again. This procedure will be repeated until the LEL monitor sees a nominal amount of VOC. In extreme cases the LEL monitor will cause the VES to enter the shutdown mode. 3. 2 Flow Measurement Device (FE-1, DP-1 ) Flow measurement is accomplished using two devices. The primary device generates a differential pressure in the process line that is proportional to flow. The secondary device is a differential pressure transmitter, which reads the differential pressure generated by the primary device. Flow is continually recorded on the strap chart recorder located in the electrical enclosure. 3. 3 Pressure Switch, Process (PS-1 ) The static pressure device will shut the system down if static pressure of the process stream should exceed preset low and high setpoints. Pressure can become too low if there is a flower failure, or if the system becomes plugged downstream from the vacuum pump. Pressure can become too high if the oxidizer or exhaust stack becomes plugged. 3. 4 Strap Chart Recorder The strip chart recorder will be placed inside of the instrument panel, and can accept up to 6 inputs. Critical parameters are recorded to verify proper operation of the entire Vapor Extraction System. The following operating parameters are recorded by the strip chart recorder : 1 Ryan-Marphy, Incorporated "The Good Earth Company"