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c <br /> Stantec <br /> SECOND QUARTER 2009 OPERATIONS MAINTENANCE AND MONITORING REPORT <br /> SHOP 10 MAINTENANCE STATION <br /> Field Activities <br /> ` July 31,2009 <br /> 2.4 Field Activities <br /> 2.1 ASISVETS SYSTEM INSTALLATION AND OPERATION <br /> �. The ASISVETS was installed by Stantec in June through October 2005 based on plans prepared by <br /> Brown and Caldwell consultants and approved by Caltrans in June 2003. An as-built site plan of installed <br /> piping, AS/SVE system wells, and treatment area location is included as Figure 3. Four AS wells <br /> constructed of 1-inch-diameter casing and two new SVE wells (VEW-1 and VEW-2)with 6-inch-diameter <br /> casing were installed between June 1 and 8, 2005 (Tables 1 and 2, and Figure 3). One sparge well <br /> (ASW-4)was installed to a depth of 96 feet below ground surface (ft-bgs)with screen placed from 91 to <br /> ` 96 ft-bgs. Based on field conditions and soil contamination encountered during drilling, the three <br /> remaining sparge wells (ASW-1, ASW-2, and ASW-3)were installed at a depth of 72 feet and screened <br /> from 67 to 72 ft-bgs. <br /> Similarly, based on field data, SVE well VEW-1 was installed to a depth of 40 ft-bgs and screened from <br /> 20 to 40 ft-bgs, and SVE well VEW-2 was installed to a depth of 40 ft-bgs and screened from 30 to 40 ft- <br /> �. bgs. Two soil samples were collected for laboratory analysis at 15 and 40 feet in boring VEW-1 and at 35 <br /> and 42 feet in boring VEW-2 prior to constructing the wells. Soil sample results are summarized in <br /> ir. Table 2. <br /> One-inch-diameter acrylonitrile butadiene styrene (ABS; Duraplus)AS piping and 4-inch-diameter <br /> Schedule 80 polyvinyl chloride (PVC) SVE piping was attached to wellheads and routed underground to <br /> an aboveground control box attached to the outside wall of the Permit Building, where sample and flow <br /> ports and flow, pressure, and vacuum gauges are located. System piping is routed aboveground from the <br /> ti.. aboveground control box along the building to a fenced and locked treatment compound in an adjacent <br /> parking lot. <br /> The treatment compound is supplied with three-phase power from an adjacent pole-transformer and <br /> consists of the following! 1) King Buck Technology(KBT) Model MMC-5A, trailer-mounted catalytic <br /> oxidizer with 100-standard cubic feet per minute (scfm), 5 hp SVE blower, and 12 kw electric heater; 2) <br /> 7.5 hp Ingersoll-Rand rotary screw(RS) 28 scfm compressor; 3) 385-gallon poly condensate and <br /> knockout water collection tank; 4) 200 amp distribution panel; and 5) miscellaneous valves, piping, and <br /> gauges. The SVE and AS system power is connected in such a way that a SVE system shutdown will <br /> '-` also shut off the AS compressor. <br /> A Permit-to-Construct(PTC)was issued by the San Joaquin Valley Air Pollution Control District <br /> (SJVAPCD) in July 2005. System operation began on December 1, 2005, and air samples of influent and <br /> effluent vapor were collected. Air analysis results from December sampling were forwarded to the <br /> SJVAPCD and a Permit-to-Operate (PTO)was issued, valid until December 31, 2010. A system <br /> `r inspection was completed by the Air District with a Stantec and Caltrans representative present on April <br /> 28, 2008. No incidents or violations were reported during inspection. System maintenance and <br /> js 15us1329-f011secor5project-051caltrenslstockton-shop 10Wm&m and gw reporting12009Und qtr 200Mg2_09 omm_fnl.doc 2-1 <br /> 4+ <br />