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06 October 2008 <br /> AGE-NC Project No. 06- 1457 <br /> Page 4 of 7 <br /> i <br /> water sampling and analysis; conclusions and recommendations will also be included, if applicable. <br /> The report will be in a format acceptable to the EHD, and will be reviewed and signed by a <br /> California Professional Geologist. <br /> 4.0. FIELD PROCEDURES <br /> All fieldprocedures will be overseen by anAGE representative underthe supervision of a California <br /> Professional Geologist. Procedures for DPE system set-up and testing, ground water sampling and <br /> equipment decontamination are outlined below. <br /> 441 . DPE SYSTEM DESIGN <br /> A portable DPE extraction unit (230Volt, 3 -phase, liquid-ring blower) extraction system with an <br /> electrical or thermal catalytic oxidizer will be placed at the site for one event consisting of a 3 -day <br /> operational period (Figure 3). The DPE blower system will be attached to the well EW- 1 by means <br /> of above ground hoses. Waste water will be collected into aholding tank. The volume ofwaste water <br /> will be measured with a flow totalizer. <br /> The test will include a constant-flow rate at the maximum vacuum sustainable by the DPE system. <br /> Results from these tests will be used to establish the effective radius of influence, ground water draw <br /> down and to determine the optimum operating level of the extraction system. <br /> 4. 1 . 1 . Ground Water and Soil Vapor Extraction <br /> 7� d A ] -inch diameter steel pipe with an angled cut at one end Cstln er") is installed into the lower <br /> portion of the extraction well, below the saturated zone, to a depth of approximately SOr _feet bsyz <br /> The stinger is attached to a hose connected to the DPE system creating multiple magnitudes of <br /> vacuum greater than the tube volume, drawing in liquid under significant force. The well connection <br /> will be accomplished using an above-ground, 200 psi industrial reinforced hose, which connects the <br /> stinger to the DPE system. The stinger, combined with the high-vacuum, will extract impacted <br /> ground water. <br /> The stinger will be lowered contemporaneously with the operation of the system and should dry out <br /> the well or lower the water table significantly, thus exposing the surrounding soils to the <br /> corresponding water level depth. Based on the previous pump test, the de-watering of the extraction <br /> well is possible. <br /> Advanced GeoEnvironmental, Inc. <br />