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Forward Inc. Landfill Expansion Project MMRP • The channel must function as a natural corridor,require little or no maintenance once the ' vegetation is established, and should provide 100-year flood protection. • The channel slope and depth will be appropriate to the 100-year flood protection. The channel ' slope and depth are based on the invert elevations of the existing channel at the start and end of the new channel.The slope between these two points along this alignment is designed for 0.00055 ft/ft which translates into a ground surface profile along the alignment a channel depth between 10 and 12 feet. ' • The appropriate responsible agencies must review and approve the updated April 2018 design for the relocation of the South Branch of South Littlejohns Creek. 59. Proposed as Part of the 2013 Project: • A liner and LCRS would be constructed at the interface of the expansion cells and the existing Class III cells, similar to the liner and LCRS that has been designed, constructed, and approved by the RWQCB for the existing Forward Landfill. • Because the liner and LCRS would be constructed on a refuse surface,the liner and LCRS design would account for differential settlements of the underlying refuse. • The appropriate responsible agencies,CalRecycle and RWQCB, shall conduct a review of the liner and leachate collection system for the interface liner and LCRS in the upcoming JTD ' update. 60. Proposed as Part of the Project • Forward Landfill has agreed to a short-term and long-term mitigation of the offsite impacts of the existing VOC plume,to provide an alternative source of drinking water to those residents in the downgradient area who are using domestic water wells for drinking water and whose domestic wells may be adversely affected by the VOC plume. A long-term solution currently being investigated by Forward to assist those residents on Newcastle Road,who are already being provided with bottled drinking water by Forward,is for Forward to provide the property owners on Newcastle Road in the footprint of the downgradient plume with municipal piped water to replace the current use of the supply wells; • The residences on Newcastle Road would continue to be supplied with bottled water until municipal piped water is provided; • Residents on Austin Road would continue to be supplied with bottled water from the City of Stockton until municipal piped water is provided. • Because of the potential for impact from the plume to the downgradient receptors, determination of the sampling program frequency and any changes to it, along with the appropriate mitigation, is the responsibility of the RWQCB and must be carried out under their permit authorization;and ' • The groundwater capture and remediation system could be augmented to capture the current offsite plume to the satisfaction of the RWQCB based on their review of future source control reports. 61. Proposed as Part of the Project(Supersedes#62,below) • Continued recharge of extracted and treated groundwater. In the GeoLogic 2017 Corrective ' Action Monitoring Workplan the construction of a storage basin for treatment system effluent that would subsequently infiltrate and recharge the groundwater is proposed. Although the Page 19