Laserfiche WebLink
• 2 . 0 SOIL AND GROUNDWATER REMEDIATION <br /> There have been three active remediation systems at the site These <br /> systems are (a) interim groundwater "pump and treat" (P&T), (b) air <br /> sparging/soil vapor extraction (AS/VE), and (c) residential domestic <br /> wellhead treatment These systems are described and the effectiveness of <br /> the systems are discussed below Tabulated data showing depths to <br /> groundwater, analytical results for groundwater samples collected from <br /> the monitoring and domestic wells, and influent air samples from the <br /> AS/VE system operation are provided in Tables One though Four Various <br /> figures showing well locations and potentiometric surface contours during <br /> different periods of operations are provided in the Figures section <br /> 3 . 0 GROUNDWATER PUMP AND TREAT SYSTEM <br /> 3 . 1 System Descrliption and Operation <br /> On September 29, 2000, ASE began operation of a P&T interim <br /> groundwater remediation system This system operated from September <br /> 29, 2000 until February 28, 2002 The primary purpose of this system <br /> was to hydraulically contain the plume until a more permanent <br /> • remediation system could be installed The system pumped groundwater <br /> from five recovery wells, treated the water with granular activated <br /> carbon, and discharged the treated water into the sanitary sewer system <br /> A complete description of the P&T system installation may be found the <br /> ASE "System Installation Report" dated October 2, 2000 <br /> 3 -2 Hydrocarbon Mass Removed DuriiaR System 012eration <br /> During the 17 months of system operation, the system recovered over <br /> 3,16$,630 gallons of hydrocarbon impacted groundwater Given the <br /> hydrocarbon concentrations in the groundwater treated and average flow <br /> rates, an estimated 13144-gallons of gasoline were removed from <br /> groundwater during the 17 months of system operation <br /> 3 . 3 Hydraulic Containmen <br /> During the aquifer pumping test, the capture zone was estimated to be <br /> between approximately 42 5 and 63 0-feet with at a constant pumping <br /> rate of 1 5-gallons per minute Cones of depression during the system <br /> operation can be seen on Figures 5 through 10 <br /> i <br /> Frank's One Stop Interim Effectiveness Report — November 2003 <br /> -2- <br />