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<br /> drum to a 5-horsepower, 200 cubic feet/minute (cfm) regenerative blower and into the KBH
<br /> catalytic oxidizer oven AGE installed an in-line flow meter after the blower motor as well as
<br /> sampling ports before the knockout drum, between the oven and after the oven to monitor the
<br /> concentration of extracted, hydrocarbons and efficiency of hydrocarbon destruction
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<br /> ' The KBH catalytic oxidation, SVE system began full-scale operation on April 1, 1997 The 0 e5rr
<br /> SVE unit operated at a maximum flowrate for approximately for three hours At approximately ,
<br /> 1800 hours on April 1, 1997, the 60-amp power service at the PG&-E service connection to aR` •,,�5{
<br /> the site failed The power demand of the SVE unit was greater than the service connection d`
<br /> could supply A new 100-amp power service was installed at the site Subsequently a new
<br /> ' power transformer was installed for the site on June 4, 1997, to prevent the Ioss of power
<br /> voltage during peak usage
<br /> ' Air-Sparging System Installation
<br /> The existing subsurface network consisted of galvanized steel piping from AS-1 to the
<br /> remediation enclosure Additional IAS injection points, necessary for efficient groundwater
<br /> ' remediation were installed on April 19, 1997 A compressor-based EnviroSparge IAS system
<br /> was installed at the site on March 24, 1997 The EnviroSparge IAS system began full-scale
<br /> operation an May 1, 1997
<br /> Three sets of extracted soil gels samples were analyzed for TPHg, BTEX, and methyl tertiary-
<br /> butyl ether (MTBE) TPHg was detected in the April 9, May 12, and June 18, 1997 samples
<br /> collected from influent vapor stream at concentrations of 1,800 ug/L, 8,900 u/L and 5,600
<br /> ug/L, respectively BTEX compounds were detected at concentrations as high as 52 ug/L
<br /> ' In April 1997, TPHg was detected in the water samples from wells MW1, MW3, MW4 and
<br /> MW5 at concentrations of 99,000 ug/L, 6,900 ug/L, 100,000 ug/L, and 73 ug/L, respectively
<br /> ' Benzene was detected in wells MW1, MW3 and MW4 at concentrations of 19,000 ug/L, 97
<br /> ug/L and 15,000 ug/L respectively Benzene was not detected in wells MW2, MW5 and
<br /> ' MW6 Other BTEX compounds were detected in these wells at concentrations as high as
<br /> 18,000 ug/L (toluene, MW4) Ethylbenzene and xylenes were detected in MW3 at
<br /> concentrations of 230 ug/L for each compound No petroleum hydrocarbons were detected in
<br /> the samples collected from well MW2 or well MW6, the newly installed downgradient well
<br /> Remediation Well Installation
<br /> ' On July 29, 1997, three IAS points (IAS-7 through IAS-9) were installed by AGE to depths of
<br /> 25 and 15 feet bgs Two probe borings were completed as IAS points using one 21-inch long,
<br /> ' 318-inch I D stainless steel screen implant attached at 25 feet bgs to an anchor tip One
<br /> additional probe boring was completed using one 21-inch long, 3/8-inch I D stainless steel
<br /> screen implant set at a depth of 15 feet bgs Vinyl tubing (3/8-inch O D ) was extended from
<br /> the sparging screen implant to the surface and a filter pack (fine glass beads) was installed
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