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3.0 SOIL VAPOR EXTRACTION SYSTEM OPERATION <br /> On June 2, 1999, ENSR started the thermal oxidizer sod vapor extraction (SVE) system in the <br /> presence of an inspector from the San Joaquin Valley Unified Air Pollution Control District <br /> (SJVUAPCD) ENSR's system startup report is currently pending publication and distribution <br /> According to ENSR, five extraction wells (VW-1 D, VW-1 S, VW-2S, VW-3 and VW-4) are being <br /> utilized by the system The system parameters at startup included a flow rate of 214 standard cubic <br /> feet per minute (scfm), vacuum of 65 inches of water column, and a concentration of volatile <br /> organic compounds by Flame Ionization (FID) of 2,100 parts per million by volume (ppmv) <br /> During startup, ENSR collected vapor samples for analysis to monitor the efficiency of the SVE <br /> system The system influent soil vapor sample contained 4,960 milligrams per cubic meter(Mg/M3) <br /> of purgeable hydrocarbons, 109 Mg/M3 of benzene, 650 Mg/M3 of toluene, 148 mg/m3 of <br /> ethylbenzene, and 560 mg/m3 of xylenes This translates to a mass recovery rate of 123 5 pounds <br /> per day <br /> On June 18, 1999, ENSR monitored the SVE system The system parameters included a flow rate <br /> of 225 to 242 scfm, vacuum of 68 to 73 inches of water column, and a concentration of volatile <br /> organic compounds of 600 to 640 ppmv Between June 2 and 18, 1999, the system operated for a <br /> total of 380 hours with an up-time of 100% <br /> On July 7, 1999, ENSR added catalyst blocks to the system The catalyst blocks should cause the <br /> system to operate at a lower temperature and reduce natural gas fuel consumption <br /> r <br /> • 6 <br /> r <br />