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iSystem Description
<br /> Sall Vapor Extraction System
<br /> The Solleco 500 cfm SVE system consists of a 500 cfm rated thermal oxidizer with a 40 hp liquid ring
<br /> blower Upon system start-up (May 16, 2005), petroleum hydrocarbon laden soil vapors were extracted
<br /> from wells VW-1, VW-3, VW-4, VW-8, VW-14, MW-2, MW-8, and MW-9 using the 40 hp blower package
<br /> capable of producing up to 28 "Hg vacuum The extracted soil vapors were abated in the thermal oxidizer
<br /> prior to discharge to the atmosphere The SVE system has a built-in hour meter that is used to determine
<br /> the operational uptime Sample ports (influent, system-Influent, and effluent) are designated to collect air
<br /> samples The results of the air samples are used to calculate the destruction efficiency of the system
<br /> Operation and Maintenance
<br /> During third quarter 2005, Stratus conducted nine site visits to conduct routine operation and
<br /> maintenance, and to collect the required discharge samples Since the influent petroleum hydrocarbon
<br /> concentrations (measured using PID) from well MW-2 were relatively low (18 6 parts per million by volume
<br /> on August 16, 2005), this well was disconnected and well MW-4 was connected for soil vapor extraction
<br /> on August 22, 2005 Currently the SVE system is set-up to extract soil vapors from wells VW-1, VW-3,
<br /> VW-4, VW-8, VW-14, MW-4, MW-8, and MW-9 During the site visit conducted on September 19, 2005,
<br /> a Stratus technician observed that the liquid ring blower was operating at a relative high noise level,
<br /> probably due to a bearing malfunction The SVE system was shutdown on the same day Stratus is
<br /> currently coordinating with the equipment manfucturer to troubleshoot the bearing malfunction
<br /> During the third quarter 2005, the SVE system operated for 2,256 30 hours between June 17, 2005 and
<br /> September 19, 2005, with an average operational uptime efficiency of 100 percent The influent GRO
<br /> concentrations in the air samples collected on July 6, 2005, August, 2, 2005, and September 1, 2005,
<br /> were reported at 35,000 mglm3, 47,000 mglm3, and 10,000 mg/m3, respectively The influent benzene
<br /> concentrations in the same samples were reported at 610 mglm3, 550 mg/m3, and 160 mg/m3,
<br /> respectively MTBE was not reported in any of the air samples collected during third quarter 2005 The
<br /> average system influent airflow rate to the SVE system was observed at 241 40 cfm at an average applied
<br /> vacuum of 85 68 inches of water column During the third quarter 2005 (between June 17 and September
<br /> 19, 2005), approximately 19,522 27 pounds of GRO were extracted and abated by the SVE system A
<br /> cumulative mass of approximately 33,485 67 lbs (Figure 6) of GRO has been removed from the
<br /> subsurface by both the two 200 cfm (previously operated) and the current 500 cfm SVE systems The
<br /> SVE system is operating as designed and is in compliance with the SJVPACD permit requirements
<br /> K 1Bp-Arco for URS\6100IQuarteriy120051Arco_6100_3Q05 doc S7"12ATUS
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