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r <br /> The analytical results indicated concentrations of "MTBE only" in parts per <br /> billion (ppb) as follows <br /> Sample Id. _ _ Result (in nrph) <br /> 17933-INF-02-27-02 1 7 <br /> 17933-GAC 1-02-27-02 < 05 <br /> 17933-GAC2-02-27-02 Not Analyzed <br /> No other compounds were identified in any of the water samples At no <br /> time did water containing MTBE enter the plumbing system of t h e <br /> residences on the property <br /> QUARTERLY OPERAIION AND MAINTENANCE., SAMPLING AND <br /> kEPORTING <br /> ASE is currently under contract to perform quarterly operation and <br /> maintenance (O&M) activities and collect samples and prepare a report <br /> every 3 months to determine the effectiveness of the treatment system <br /> ASE will continue to visit the Site periodically to check the performance of <br /> the system, backflush the carbon canisters, if necessary, and repair any <br /> problems that arise <br /> ASE will continue to collect influent (pre-treatment) after aii -stripping, <br /> and after carbon canister {post-treatment) water samples every three <br /> months for analysis of TPH-G, BTEX, the five fuel oxygenates, and lead <br /> scavengers by EPA Method 8260B ASE will prepare and issue a report in <br /> the following month that details the quarter's activities Should it b e <br /> determined that hydrocarbons are breaking-through the first carbon <br /> canister, ASE will ieplace that canister with a new one <br /> A copy of the quaff terly report will go to the property ownei, tenants, o u i <br /> client, and the appropriate regulatory agencies Should you have any <br /> questions or comments, please feel fiee to give us a call at (925) 820- <br /> 9391 <br /> 2- <br />