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2,16 June 14, 2001 Discovery of Free-Floating Hydrocarbons During routine quarterly groundwater monitoring activities in June 2001 , ASE personnel discovered free-floating hydrocarbons on the groundwater in monitoring wells MW-5, MW-6 and piezometer P-4 Historically, only ' monitoring well MW-5 contained a measurable thickness of free-floating hydrocarbons and MW-6 had previously contain a sheen However, since the installation of the groundwater remediation system, the product in ' MW-5 had reduced to an unmeasureable thickness 2.27 December 2001 Installation of ASIVE. Rernediation System In late November 2001, ASE installed seven air-sparging (AS) wells a n d ' seven vapor-extraction (VE) wells at the site The AS wells were then manifolded together, the VE wells were then manifolded together ASE then installed an internal combustion (IC) engine remediation system at the site within a fenced-enclosure The AS manifold was piped to an air- sparging blower on the IC engine The VE manifold was piped to a vacuum blower on the IC engine On December 21, 2001, the remediation system was started By the end of December 2002, the AS/VE system h a d recovered approximately 524 gallons of gasoline from the subsurface The system was turned off on January 1, 2003 for a period of site monitoring during non-remedial activities 28 May 20Q3 AS/VF Re-Start After a brief period on non-remediation activities at the site, ASE re- installed a new IC engine to the existing manifolds and turned the AS/VE remediation system back on Since the re-start in May 2003, the system has only recovered approximately 3-gallons of gasoline from the subsurface Monthly influent air samples have contained no greater than trace concentrations of the analytes tested 3 . 0 SCOPE OF WORK The scope of work for this assessment is to install groundwater monitoring wells downgradient of the site to monitor groundwater in several groundwater-bearing zones Since ASE has previously drilled CPT borings in these locations, the well construction of the wells will be preset and no subsurface soil sampling will take place This will allow for the Frank's One Stop Workplan — September 2003 ' -12-