ARCHIVED REPORTS_2014_2 - Laserfiche WebLink

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On May 31 2012 the County submitted a Final Cover Expansion Design incorporating review comments received by RWQCB staff. Reconsideration of the schedule by Shaw Environmental indicated project completion in March 2013. On June 6, 2012,the County submitted a revised schedule showing bidding in late 2012 with construction starting in the spring of 2013. A letter from Water Board staff dated July 13, 2012 apparently tentatively accepted that revised schedule. On August 21,2012,the County submitted the Evaluation Monitoring Program Report—Phase 2, which delineated the extent of groundwater impact. On September 26, 2012, the County received a Notice of Violation for failure to delineate the extent of groundwater impact, and requiring the following: • Install a fourth permanent groundwater monitoring well beyond Investigate the extent of the VOC plume to the north-northeast of the site • Conduct a water supply well search within a 1-mile radius of the site (not previously required) • Install a minimum of two soil gas probes along the northern site boundary(not previously required) On October 17, 2012, Water Board agreed that the data from the three existing wells beyond County property were sufficient to delineate the extent of groundwater impact. The violation for failing to delineate the extent of groundwater impact has not been rescinded. In the session of April 11 and 12, 2013; the Regional Water Quality Control Board issued a Cease and Desist Order requiring closure of the un-closed portion of the Corral Hollow Landfill, installation of additional landfill gas collection wells, installing two additional perimeter landfill gas migration monitoring wells, and establishing the timeline for future corrective action, if needed. On January 25, 2013, the County submitted an Engineering Feasibility Study for Corrective Action Alternatives Evaluation establishing criteria and timeline for future corrective action. rOn May 20, 2013, field work related to the construction of the closure cap began, after review of preliminary tests of proposed geofabrics. On August 9, 2013, construction of the closure project was substantially complete. Hydroseeding of the disturbed surfaces was postponed until weather was more suitable for seed germination. On August 32,the two additional perimeter LFG migration monitoring wells were completed,the installation of which was documented in a Brief Technical Report. On September 6, 2013, the County submitted a Brief Technical Report, documenting the significant features of closure cap construction and the installation of the two additional perimeter LFG migration monitoring wells. Corral Hollow Sanitary Landfill 8 Department of Public Works/Solid Waste 2nd Quarter 2014 Groundwater Monitoring County of San Joaquin—July 15,2014