CORRESPONDENCE_2007 (1/07 - 6/07)

Home Browse Search

and refuse beneath the membrane. Two or more collection sections would be provided, each with a valve to adjust the rate of collection. The gas collected in these trenches will be carried to the LFG flare, and combusted in accordance with the Permit to Operate issued by the San Joaquin Valley Air Pollution Control District. At this time, we propose that the area to receive the membrane would extend between well SB-1 to MW-5 (Figure 2). Groundwater monitoring data indicates a gradient from SB-1 to MW-5, so the water would flow through soil that was under direct influence of the purging effect of LFG withdrawal. The width of the membrane will be based on the results of the Phase 2 investigation of the extent of the closure cap. This will be work will be coordinated with the extension of the closure cap, as previously proposed to the Closure Section of the CIWMB. If increasing the LFG collection in the area under the membrane is not effective, further corrective action methods will be contemplated, including installing soil gas wells in the soil adjacent to the northern side of the landfill east of MW-5. Schedule This schedule is based on concurrence by regulatory agencies, primarily the CIWMB Closure Division. The start date for this schedule is based on the date in Water Board staff letter of 7 December 2007; however, we intend to accelerate this schedule if possible. Corrective Action Enhancement Schedule Tentative Date Activity 23 March 2007 * Phase 2 investigation of the extent of closure cap and refuse Submit report to regulating agencies,proposing method 6 April 2007 extent of closure cap extension based on results of Phase 2 investigation 20 April 2007 Receive approval of method and extent of cap extension 1 June 2007 Complete design of closure cap extension, submit to regulatory agencies for review and approval 15 June 2007 Receive ap roval of design, finalize cost estimate 21 June 2007 Submit revised Report of Waste Discharge in accordance with Title 27 Section 204300). Issue design for bid (assuming estimated cost is below 6 July 2007 $100,000. If the estimated cost is greater, add 6 weeks for review and processing by Public Works Design Division * per Water Board staff letter of 7 December 2007 NM Corral Hollow\Groundwater Monitoring\CH CorrActincr 07.doc Increase in Corrective Action 4 Corral Hollow Sanitary Landfill January 23,2007 San Joaquin County Public Works/Solid Waste