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• analytical report is attached in Appendix A <br /> The analytical results indicated concentrations of "MTBE only" in parts p e r <br /> billion (ppb) as follows <br /> Sample Id. Result (in p4)-h) <br /> 17911-INF-12-13-02 5 5 <br /> 17911-GAC1-12-13-02 < 05 <br /> 17911-GAC2-12-13-02 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 the <br /> residence on the property <br /> SEMI-ANNUAL, OPERATION- AND MAINTENANCE, SAMPLING .-AND <br /> REPORTING; <br /> ASE is currently under contract to perform semi-annual operation a n d <br /> maintenance (O&M) activities and collect samples and prepare a report <br /> every 6 months to determine the effectiveness of the treatment system <br /> M 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) and after carbon <br /> canister (post-treatment) water samples every 6 months for analysis of <br /> TPH-G, BTEX, the five fuel oxygenates, and lead scavengers by EPA Method <br /> 8260B ASE will prepare and issue a report in the following month that <br /> details the O&M activities Should it be determined that hydrocarbons are <br /> breaking-through the first carbon canister, ASE will replace that canister <br /> with a new one <br /> A copy of the semi-annual report will go to the property owner, tenants, <br /> our client, and the appropriate regulatory agencies <br /> • <br /> - 2- <br />