CORRESPONDENCE_2017-2018 - Laserfiche WebLink

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North County Sanitary Lan -2- 17 October 2017 San Joaquin County Staff observed the constructed lysimeters but did not observe the testing (See attached inspection report). Other areas of concern were not noted. Compliance Concerns The County must understand that without a properly installed, maintained, and sampled monitoring network for all units at the landfill, Compliance and Enforcement staff are evaluating all enforcement options to return this site to compliance with the WDRs. Summary Additional groundwater wells are needed to address the deficiencies of the Detection Monitoring Program (DMP). Currently, only two of eight wells are able to provide groundwater sampling data. The Discharger proposes to deepen wells G-3D and G-6. Background well G-1A also needs to be reconstructed. Furthermore, a release of LFG has been detected outside the waste management unit suggesting the LFG extraction system is not controlling LFG migration. Staff has outlined the DMP issues in a letter dated 19 June 2017, approving the installation of well G-9. To expedite the installation of the wells, by 31 October 2017 the Discharger shall submit a brief letter with location map and well construction detail based on the approved installation work plan for well G-9. The brief letter shall include the following scope of work: • Reconstruct wells G-3D, G-6, and background well G-1A. Submit a brief letter with location map and well construction detail. Wells will be installed per the approved G-9 work plan. • Propose to increase the corrective action measures (i.e. LFG extraction) to address the LFG release detected at soil gas probe SG-6. Corrective action measures at the site consist of LFG extraction and the expectation is that the Discharger will enhance the LFG extraction system by installing additional LFG extraction wells. Module M1/M3 is approximately 47 acres in size and only seven extraction wells are installed. The methane detections reported in SG-6 suggests the system is undersized and that several more extraction wells shall be installed to address the release. The Discharger shall submit PDF documents to Geotracker. Please send a courtesy email to staff notifying them of the upload, and provide the upload confirmation number. To ensure that your submittals are routed to the appropriate staff as quickly as possible, the following information should be included in any email used to transmit documents to this office: Regulatory Program Title 27 Unit Compliance Regulated Party Name (Discharger) San Joaquin County Facility Name Foothill Sanitary Landfill County San Joaquin Count CIWQS Place ID 224836