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F <br /> t <br /> Foothill Landfill � -2- 20 June 2014 <br /> San Joaquin County <br /> Once the unlined side slope and the issue of filling this area had been discussed, staff inspected <br /> the eastern side slope and top deck of Module I. As shown in Photo 5, areas that were <br /> inspected appeared to have a robust vegetative cover. However, as shown in Photo 6, the <br /> operator had recently spread cover soil over waste but had not prepared the area for possible <br /> erosion from wind or rain. This was an area of concern and discussed with the Discharger. The <br /> operator indicated that BMPs would be installed. <br /> The discussions during the site inspection covered multiple issues with regard to the ET cover <br /> of Module I, groundwater impacts as a result of landfill gas (LFG), and the number of LFG <br /> extraction wells installed within the waste mass of Module I. The Discharger has expressed <br /> concern over recent groundwater impacts detected in site wells attributed to LFG. This also is a <br /> concern of staff and based on the site inspection and dialogue with the Discharger, it was <br /> apparent that the nine LFG extraction wells in the unlined Module I are not sufficient to control <br /> the migration of LFG from the unit. Staff inspected the LFG system and flare as shown in <br /> Figure 9. The log book for the system was reviewed and as shown in Figure 10, LFG gas <br /> extracted from the landfill is near 50% methane. The Discharger made staff aware that the <br /> adjacent landfill gas to energy plant was constructed adjacent to the LFG system and flare, but <br /> was not operational as of the date of this inspection. <br /> Other areas of concern were not noted during this inspection. Staff will provide another letter to <br /> address the Corrective Action program at the facility. The photo log for the 19 March 2014 is <br /> attached. If you have any questions please call me at 916-464-4737 or email me at <br /> td a if rate CcD-wate rb o a rd s.ca.g ov. <br /> TODD A. DEL FRATE, P.G. <br /> Engineering Geologist <br /> WDRs Compliance and Enforcement <br /> Enclosure: Site Inspection Photo Log <br /> Cc: Robert McClellon, San Joaquin County Environmental Health <br /> CIWQS SIID#16044592 <br />