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21 March 2006 AGE-NC Project No 97-0290 ' Page 8 of 15 ' sparging wells using 2-inch diameter PVC casing with a 0 020-inch slotted screen SW3 and SW9 were drilled to a total depth of 60 feet bsg with a 2 5-foot screen interval S W4, S W6,and S W8 were drilled at 25 degrees from vertical to a total depth of 66 feet bsg with a 2 5-foot screen interval SW5 and SW7 were drilled at 10 degrees from vertical to a total depth of 61 feet bsg with a 2 5-foot screen interval ' On 23 April 2001 ground water monitoring well MW-1 was pressure grouted and abandon in-place On 19 March 2001, five oxygen release compound (ORC) packages were installed at the site The ' ORC was in tube form within 12-mch sock material Two 12-inch sock packages of ORC were placed in wells MW-2, MW-4, MW-5, MW-6, and MW-7 by AGE The ORC was installed below the water table at 55 feet bsg The effect of the IAS system and/or ORC was monitored utilizing a YSI-55 dissolved oxygen meter on groundwater During each monitoring event,the depth to ground water and percentage of dissolved oxygen were measured for available monitoring wells 62 SOIL-VAPOR EXTRACTION SYSTEM INSTALLATION/OPERATION On 13 March 2000,a King,Buck/Hasstech(KBH)thermal oxidation soil-vapor extraction unit was delivered to the site by AGE Beginning on 09 March 2000, setup of the extraction network system ' was initiated with installation of the electrical power source and the natural gas line The SVE network was installed connecting wells VW-1 through VW-6 and the SVE unit using 2-inch diameter Schedule 40 PVC piping and 2-inch gate valves to control flow from individual wells The piping was placed above ground A 3-inch network manifold was constructed and connected to the SVE unit An in-line Dwyer 300 flow meter was installed in the 3-inch influent line into the SVE unit, this meter was monitored monthly to calculate the influent rate The 3-inch piping was then routed through a moisture knockout vessel to a 5-horsepower,maximum 100 standard cubic feet per minute(scfm)blower and into the thermal oxidizer furnace An additional in-line flow meter was located at the flame arrester within the SVE to measure the total quantity of vapor processed through the SVE system The KBH thermal SVE system began operation on 19 April 2000 The initiation of the SVE operation was observed on 19.lune 2000 by representatives of the San Joaquin Unified Air Pollution Control District(APCD) On 27 February 2001,AGE conducted the demobilization of the thermal oxidation system from the site The system was removed on that date in preparation for site re- development IOn 01 March 2001, AGE installed and performed a start-up of portable carbon-based vapor Advanced GeoEnvironmental,Inc I