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• ethylbenzene, and Wenes (collectively known as BTEX), the five fuel oxygenates, and lead scavengers by EPA Method 8260B A copy of the analytical report is attached in Appendix A The analytical results indicated concentrations of "MTBE only" in parts p e t billion (ppb) as follows Sample Id. Result (in P ))h1 17950-INF-02-27-02 1 7 0 17950-AS-02-27-02 1 10 17950-GAC 1 -02-27-02 20 17950-GAC2-02-27-02 < 05 No other compounds were identified to any of the water samples At no time did water containing MTBE enter the plumbing system of the residences on the property The current effictenc} of the air-stripper to remove MTBE is below the projected efficiency derived during the air-Stripper modeling phase of this project ASE was expecting an efficiency in the 50% to 60% range for MTBE removal at these concentrations ASE will make an adju�,tment to the air flow and exhaust plumbing, as recommended by the air-stripper manutacturei, to assist in the MTBE removal efficiency The two GAC canisters are scheduled foi carbon replacement dozing the week of Mai ch 25, 2002 QUARTERLY OPERATION AND MAINTENANCE, SAMPIING AND REPORTING ASE is currently under contract to perform quarterly operation and maintenance (O&M) activities and collect samples and prepare a i epos t every 3 months to determine the effectiveness of the treatment �,vstem ASE will continue to %isit the Site periodically to check the perfoi mance o t the system, backflush the carbon canisters, if necessary, and iepair any problems that arise ASE will continue to collect influent (pie-treatment), after ati -stripping and atter carbon canister (post-treatment) water samples eery three months for analysis of TPH-G, BTEX, the five fuel oxygenates and lead •, scavengers by EPA Method 8260B ASE will prepare and issue a t epos t in the following month that details the quaff tea's activities Should it b e determined that hydrocarbons ate breaking-through the first carbon - 2-