Laserfiche WebLink
7 <br /> ATC Associates Inc <br /> u 1117 Lone Palm Avenue, Suite B <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> Fax 209-579-2225 <br /> contained detectable concentrations of TPHg and BTEX Soil samples collected from B2 <br /> contained detectable concentrations of methyl tertiary butyl ether(MTBE) <br /> In June and July 2000, WHF supervised the advancement of ten soil bongs at the site and <br />' completed five of the bongs as momtonng wells (MW5, MW6, MW8, MW9, and MW10), and <br /> three of the bonngs as vapor extraction wells (VW1, VW2, and VW3) MW7 was replaced by <br /> VW3 Soil samples collected from borings B101, B103, B104, VW1, and VW3 contained <br /> detectable concentrations of TPHg and BTEX <br /> ' On September 18 and 29, 2003, ATC performed a short-term vapor extraction test and a long- <br /> term vapor extraction test, respectively On the first day, the short-term vapor extraction test <br /> utilized vapor well VW2 as the vapor extraction point while monitoring vacuum response in <br /> ' VWl, VW3, MW1, MW2, MW3, MW4, MW5, MW6, MW8, and MW9 The sort-term test was <br /> operated for approximately 3 hours and 45 minutes and the long-term test was operated for <br /> approximately 5 hours <br /> ATC prepared an Intens Remediation Plan on March 25, 2004, recommending the installation <br /> and engineering design of a soil vapor extraction/air sparging system designed to remediate <br /> petroleum hydrocarbon impacted soil and groundwater <br /> Dunng the week of August 15, 2005, ATC supervised trenching and plumbing activities for the <br /> subsurface remediation piping designed to direct extracted hydrocarbon vapor from the extraction <br /> wells to the remediation compound NRC personnel installed the subsurface piping and wellhead <br /> connections between the vapor extraction/air sparging wells and the remediation compound Each <br /> wellhead connection included a gate valve, vacuum gauge, sampling port, and flow rate measurement <br /> port The trenches were backfilled with pea-gravel aggregate base material, followed by native soil to <br /> approximately four inches below grade The backfill was compacted and the trench locations were <br /> resurfaced with asphalt and concrete to match the pre-existing site surface conditions <br /> ' In August 2005,the San Joaquin Valley Air Pollution Control District(SJVAPCD)issued an Authonty <br /> to Construct for the installation and operation of a catalytic oxidizer that is part of the vapor extraction <br /> system A Solleco 250 ECAT electnetthermal catalytic oxidizer was installed on site <br /> ' The remediation system consisted of four vapor wells (VW1 through VW4) connected by <br /> subsurface piping to an electric catalytic/thermal oxidizer The thermal oxidizer is a 250 ECAT <br /> ' manufactured by Solleco The remediation system is optimized to run at a minimum of 600 <br /> degrees Fahrenheit (F) at a total flow rate of 235 cubic feet per minute (SCFM) <br /> A 15 by 20 foot privacy slat chain-link fence was installed by Hayes Fence Company, enclosing the <br /> remediation compound Slats were installed in the fence to provide visual screening of the equipment <br /> installed on the property <br /> S 154 2951000 1\0&W1st-qtr-2006 doc 2 <br />