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i <br /> oxygenates, and lead scavengers by EPA Method 8260B A copy of the <br /> analytical report is attached in Appendix A <br /> The analytical results indicated concentrations of "MTBE only" in parts per <br /> billion (ppb) as follows <br /> Sample Id. (in—Upb) <br /> 17886-INF-01-16-03 < 05 <br /> 17886-GAC1-01-16-03 < 05 <br /> 17886-GAC2-01-16-03 Not Analyzed <br /> 17886-IRR-01-16-03 < 05 <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 /> residences on the property <br /> SEMI-ANNUAL OPERATION AND MAINTENANCE, SAMPLING, AND <br /> REPORTING <br /> ASE is currently under contract to perform semi-annual operation and <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 /> 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 irrigation well, influent (pre-treatment) and <br /> after carbon canister (post-treatment) water samples every 6 months for <br /> analysis of TPH-G, BTEX, the five fuel oxygenates, and lead scavengers by <br /> EPA Method 8260B ASE will prepare and issue a report in the following <br /> month that details the system's activities Should it be determined that <br /> hydrocarbons are breaking-through the first carbon canister, ASE will <br /> replace that canister with a new one <br /> A copy of the semi-annual report will go to the property owner, o u r <br /> client, and the appropriate regulatory agencies <br /> • <br /> -a- <br />