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W <br />Mr. Todd Del Frate -2- <br />SECOND <br />2 - <br />SECOND SEMIANNUAL 2017 GROUNDWATER AND SURFACE WATER MONITORING REPORT, <br />FOOTHILL SANITARY LANDFILL <br />Methane was not detected in the interior soil gas wells during the 2nd semiannual 2017 sampling <br />event. <br />As presented in section "COMPLIANCE HISTORY SUMMARY" of this report is a discussion of <br />the 4 to 5 -year lag time between corrective actions taken at the surface of the site and <br />observations of responses to those actions within groundwater. Therefore, the additional landfill <br />gas extraction wells and other additional landfill gas extraction efforts taken with the landfill may <br />take several years to produce observable changes in the groundwater beneath the site. <br />However, the enhanced tuning of the LFG wellfield by the County's operator that was ordered <br />following the results of the first semi-annual monitoring event appears to have a positive impact <br />on the levels of VOCs in MW -3. The rather dry summer and fall months may also be helping <br />with LFG recovery as compared to the heavy rains of the previous rainy season. <br />I certify under penalty of perjury that I am familiar with the information submitted in this report, <br />and to the best of my knowledge the report is true, accurate, and complete. <br />If you have any questions, please contact me at (209) 953-7316. <br />Sincerely, <br />6y". <br />TAJ M. BAHADORI <br />Senior Engineer <br />TMB:sc <br />N:\1 Foothill\RWQCB\Groundwater Monitoring\2017 GW Reports\2nd Semiannual\2017 FH 2SA GW Cover Letter.docx <br />Enclosure <br />Jim Stone, Deputy Director/Operations (letter only, electronic copy) <br />Desi Reno, Integrated Waste Manager (letter only, electronic copy) <br />Robert McClellon, Environmental Health Department (electronic copy) <br />