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r� f�Il . 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 not operational during the first quarter 2005 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 infecting at a maximum of 20 pounds per square inch (PSI) at low flow rates The maximum flow rate is approximately 21 SCFM There are two AS remediation wells (AS I. 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 The AS system was also not operational during the first quarter 2005 REMEDIATION SYSTEM MONITORING Vapor Extraction System Monitoring During the first quarter 2005 reporting period, ATC personnel did not monitor the vapor extraction system since it was not operated Vapor Analytical Results No vapor samples were collected from the vapor extraction system during the first quarter 2005 monitoring events Historical vapor analytical data is provided in Table 4 Water Treatment System Analytical Results The influent and effluent water samples from the treatment and discharge component of the vapor extraction system were not collected during the first quarter 2005 since the remediation system was inoperational and the vapor extraction system was previously removed A summary of analytical results is presented in Table 5 Groundwater laboratory data sheets and chain- of-custody documentation are contained in Attachment 2 Aar Sparge System Monitoring During the current reporting period, ATC personnel did not monitor the air sparge system on since the vapor extraction system was not operational s\enviro1625961quartiyllgr-2005 doe 5 ATC ASSOCIATES INC