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iINV- ATC Associates Inc 7� TIC 1117 Lone Palm Avenue, Suite B Modesto, California 95351 209-579-2221 ' A s s o c I A T e s 1 N c FaX 209-579-2225 contained detectable concentrations of TPHg and BTEX Soil samples collected from B2 contained detectable concentrations of methyl tertiary butyl ether(MTBE) In June and July 2000, WHF supervised the advancement of ten soil borings at the site and completed five of the borings as monitoring wells (MW5, MW6, MW8, MW9, and MW 10), and three of the borings as vapor extraction wells (VWl, VW2, and VW3) MW7 was replaced by VW3 Soil samples collected from bonngs B101, B103, B104, VWl, and VW3 contained detectable concentrations of TPHg and BTEX ' On September 18 and 29, 2003, ATC performed a short-term vapor extraction test and a long- term vapor extraction test, respectively On the first day, the short-term vapor extraction test utilized vapor well VW2 as the vapor extraction point while monitoring vacuum response in ' VWl, VW3, MWl, MW2, MW3, MW4, MW5, MW6, MW8, and MW9 The sort-term test was operated for approximately 3 hours and 45 minutes and the long-term test was operated for approximately 5 hours ATC prepared an Interim Remediation Plan on March 25, 2004, recommending the installation and engineering design of a soil vapor extraction/air spargmg system designed to remediate IPpetroleum hydrocarbon impacted soil and groundwater During the week of August 15, 2005, ATC supervised trenchmg and plumbing activities for the subsurface remediation piping designed to direct extracted hydrocarbon vapor from the extraction wells to the remediation compound NRC personnel installed the subsurface piping and wellhead connections between the vapor extraction/air spargmg wells and the remediation compound Each wellhead connection included a gate valve, vacuum gauge, sampling port, and flow rate measurement port The trenches were backfilled with pea-gravel aggregate base material, followed by native soil to ' approximately four inches below grade The backfill was compacted and the trench locations were resurfaced with asphalt and concrete to match the pre-existing site surface conditions ' In August 2005, the San Joaquin Valley Air Pollution Control District(SJVAPCD)issued an Authority to Construct for the installation and operation of a catalytic oxidizer that is part of the vapor extraction system A Solleco 250 ECAT electridthermal catalytic oxidizer was installed on site The remediation system consisted of four vapor wells (VWl through VW4) connected by subsurface piping to an electric catalytic/thermal oxidizer The thermal oxidizer is a 250 ECAT ' manufactured by Solleco The remediation system is optimized to run at a minimum of 600 degrees Fahrenheit (F) at a total flow rate of 235 cubic feet per minute(cfim) A 15 by 20 foot privacy slat chain hnk fence was installed by Hayes Fence Company, enclosing the remediation compound Slats were installed in the fence to provide visual screening of the equipment installed on the property S 1625881031quer1er1yti2-nd qtr-zoos doe 2