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Foothill Sanitary Landfill - 2 - 27 July 2015 San Joaquin County Staff's main concern with the EFS addendum is the number of soil gas probes being proposed for reconstruction in Phase 1. The addendum proposes to reconstruct probes SG-2, SG-3, SG-5, and SG-11. The addendum proposes to install the four probes and based on field measurements, additional probes will be proposed. New probes and screened intervals will be based on VOC detections measured in the new triple-completion probes. Staff has reviewed the latest data from the Annual 2014 groundwater monitoring report and it appears that historical LFG conditions continue to exist in the vadose zone with the highest number of VOCs recorded during this event coming from gas probe SG-1. Probe SG-1 is located in the vicinity of well MW-3, which also reported VOCs detections in groundwater. Furthermore, probe SG-1 is also in the vicinity of gas probes SG-10 and SG-11. Therefore, soil gas probes must be reconstructed as triple completion wells during Phase 1 and shall include SG-2A, SG-6A, SG-10, and SG-11A. Once installed, monitoring of soil gas probes shall be conducted in accordance with Monitoring and Reporting Program (MRP) R5-2015- 0058. All existing single gas probes (SG-1, SG-3, SG-4, SG-5, SG-7, and SG-9) shall also be monitored in accordance with the MRP. The Discharger has outlined a schedule of completion for Phase I that appears excessive. The EFS required by the 1 August 2014 NOV has been slowed by multiple reiterations and meetings requiring clarification and more detail. Therefore, staff requests the Discharger submit monthly progress reports with updates of the formal bid process, preparation of a Request for Proposal (RFP), advertising the RFP, bid review, bidder selection, and Board of Supervisor approval and award. The Discharger shall conduct the ROI analysis and modeling and present those results by the 1 October 2015 progress report. The first monthly progress report is due 1 September 2015. Once the Discharger has awarded the bid, the Discharger shall perform the approved Phase 1 scope of work, forthwith. The Discharger anticipates the completion of Phase 1 construction by 31 January 2016 and submittal of well installation report by 31 March 2016. In this report, the Discharger shall evaluate the monitoring data to determine the extent of contamination resulting from the release of LFG to the vadose zone and groundwater and contain a schedule for the Phase II scope of work. The Discharger may submit PDF documents to either the centralvalleysacramento@waterboards.ca.gov email or submit the documents to Geotracker. If documents are already submitted to Geotracker, continue to do so. Please send a courtesy email to staff notifying them of the upload. 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 County CIWQS Place ID 1224836