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e f� v ASSOC I ATE S I NC . approximately 50 feet of 3-inch diameter, ABS pipe was placed on the surface of the site from the remediation compound to a discharge point located inside the bathroom of the on-site building. The ABS pipe was connected to the existing sewer discharge line by a California licensed plumber during the week of November 25, 2002. Groundwater is currently separated from the extracted vapor in a 50-gallon knockout tank located near the thermal oxidizing unit. The knockout tank is equipped with water level sensors and when the knockout tank is approximately 80% full of groundwater, a transfer pump transfers the water from the knockout tank into a 1,000-gallon poly drop tank that is also located inside the remediation compound. The drop tank is equipped with water level sensors and when the drop tank is approximately 80% full of groundwater, a second transfer pump pumps the water from the drop tank through the carbon filtration system. The transfer pump stops pumping when the drop tank is reduced to 55% capacity. The aqueous-phase carbon filtration system originally consisted of three ASC200 200-pound carbon vessels containing liquid-phase granular activated carbon. The three ASC200 carbon vessels were connected in series by a hose connection system. These canisters were replaced in December of 2003 with two 2000-pound carbon canisters to reduce the frequency and number of carbon change-outs and the associated operation and maintenance (O&M) costs. The two carbon vessels are setup in series with sampling ports before the lead vessel, in between the lead and lag vessels, and after the lag vessel. The water treatment system was inoperational during the fourth quarter 2004 along with the vapor extraction system. AS Treatment System The AS system consists of a GAST 2567-P132-T908X rotary vane, 2- horse power, air compressor. This blower is capable of injecting at a maximum of 20 pounds per square inch (PSI) at low flow rates. The maximum flow rate is approximately 21 SUM. There are two AS remediation wells (AS 1 and AS2), which are installed to 40 feet bgs with five feet of well screen. Each AS wellhead connection includes a gate valve, pressure gauge and flow rate measurement port. ATC started the AS system on February 13, 2003, The AS system was turned off during the fourth quarter due to the vapor extraction system being inoperational and removed by the vendor. REMEDIATION SYSTEM MONITORING Vapor Extraction System Monitoring. During the fourth quarter 2004 reporting period, ATC personnel did not monitor the vapor extraction system. It was inoperational during the early part of the fourth quarter and later removed by the vendor without notice. • s:lcnviro1625961quart[y14gr-2004.doe 5