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r • ethylbenzene, and xylenes (collectively known as BTEX), the five fuel oxygenates, and lead scavengers by EPA Method 8260B A copy of t h e analytical report is attached in Appendix A The analytical results indicated concentrations of "MTBE only" in parts p e r billion (ppb) as follows Samnle Id. Result lin nrnb) 17950-INF-02-27-02 300 17950-AS-02-27-02 120 17950-GAC 1-02-27-02 19 17950-GAC2-02-27-02 < 05 No other compounds were identified in any of the water samples At no time did water containing MTBE enter the plumbing system of t h e residences on the property The air-stripper exhaust stack was modified to enhance its efficiency in removing MTBE since the last sample collection, its efficiency is now 60% GAC CANISTER RECYCLING Four new GAC canisters were delivered to the site on June 4, 2002 O n that day, GAC #1 was removed from the site for off-site recycling GAC #2 was placed 1n position #1, and a new GAC canister was put in the # 2 position Since it has become a pattern that GAC #1 is showing breakthrough each quarter, ASE now has a surplus of new canisters at the site As a part of routing quarterly O&M from now on, GAC #1 will be removed, GAC #2 will take its place, and a new GAC canister will be p u t into the #2 position QUARTERLY OPERATION AND MA,INTENANCE, SAMPLING ,.,._AND REPORTING ' ASE is currently under contract to perform quarterly operation a n d maintenance (O&M) activities and collect samples and prepare a report every 3 months to determine the effectiveness of the treatment system ASE will continue to visit the site periodically to check the performance of the system, backflush the carbon canisters, if necessary, and repair any problems that arise • ASE will continue to collect influent (pre-treatment), after air-stripping, and after carbon canister (post-treatment) water samples every three - 2-