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- - -------- ------ -- --- <br /> -------------- <br /> C�LEAMATE.Kff_% <br /> G R 0 U P <br /> Euvjr.nnle"tal Services <br /> 3.2 Groundwater Analytical Results <br /> Groundwater sampling results for gasoline range hydrocarbons are summarized as follows: <br /> Depth to groundwater range 11.43 (MW-4) to 13.19 (MW-8) feet below <br /> top-of-casing (TOC) <br /> Flow direction and gradient Easterly at approximate) 0.006 feet/foot <br /> From 1.5 µg11- (NW-2) to 300 µg11. {MW- <br /> concentration range <br /> 5B). <br /> Toluene concentration range From 1.0 µg/L (MW-2) to 70 µg/L (MW-1) <br /> Ethylbenzene concentration range From<0.50 [tg/L (MW-7) to 79 µg/1- (MW- <br /> =J 1) <br /> tg/1- (MW- <br /> 1) <br /> Xylenes concentration range From 1.6 Rg/L (MW-7) to 230 [tgtL (MW- <br /> 1) <br /> TPH-g concentration range From <50 [tg/L (MW-2, -4) to 3,900 µg[L <br /> (MW-1). <br /> MTBE concentration range Not detected in concentrations exceeding <br /> indicated laboratory method reporting limits <br /> (<0.50 µgtL to <5.0 RglL), <br /> The groundwater flow direction and gradient as determined by this sampling event is <br /> substantially similar to previous monitoring events. Groundwater elevation and analytical data <br /> are included in Tables I and 2. Well construction data are provided in Table 3. A groundwater <br /> elevation map based on the groundwater elevation data from all monitoring wells was prepared <br /> and is presented as Figure 3. Revised dissolved-phase hydrocarbon distribution maps including <br /> iso-concentration contours of benzene and TPHg in groundwater are presented as Figure 4 and <br /> Figure 5 respectively. Analytical reports for this groundwater monitoring event are included as <br /> F=^j Appendix D. Copies of Clearwater's field data collection forms are provided in Appendix C. <br /> 4.0 iSOC SYSTEM INSTALLATION & START-UP <br /> 4.1 Overview of iSOC Technology <br /> The Submerged Oxygen Curtain system (iSOC) infuses oxygen gas into groundwater as a <br /> dissolved phase using a spargeless technique. The proprietary structured polymer used in the <br /> iSOC unit provides large surface area for gas transfer, and is housed within a 15 inch by 1.75 <br /> inch stainless steel casing which is placed inside 2-inch or larger well, and submerged within the <br /> -up <br /> ZB178E iSOC Systern Installation/Start 11 Nov.24,2004 <br />