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The analytical results indicated concentrations of "MTBE only" in parts p e r <br /> • billion (ppb) as follows <br /> Sample Id. Result - (in liph) <br /> 17933-INF-08-23-02 20 <br /> 17933-GAC1-08-23-02 < 05 <br /> 17933-GAC2-08-23-02 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 OPERATION AND MAINTENANCE. SAMPLING AND <br /> REPORTING <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 air-strapping, <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 replace that canister with a new one <br /> A copy of the quarterly report will go to the property owner, tenants, o u r <br /> client, and the appropriate regulatory agencies <br /> i <br /> _ 2_ <br />