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Supplement to Final Environm al Impact Report Page 5 Forward Inc. Landfill Development Project-South and Northeast Portions lower than the permitted maximum height of 210 feet MSL for the existing Forward Landfill. The footprint of the refuse fill would be set back a minimum of 100 feet from the east property boundary. The additional development area would have a base liner and Leachate Collection and Recovery System(LCRS)consistent with currently constructed modules and in compliance with pertinent regulatory requirements. The proposed landfill expansion refuse fill grades meet both State and Federal regulatory criteria under both static and seismic conditions? The Title 27 regulations governing landfills and Forward's WDRs require a minimum five-foot separation between wastes or leachates and the highest anticipated elevation of underlying groundwater(including the capillary fringe) or the installation of an engineered alternative,such as a subdrain. The regional groundwater in the greater Stockton area,including the vicinity of the Forward Landfill,has been overdrawn for many years and has shown a clear pattern of decreasing groundwater levels. Current groundwater levels at the landfill are approximately 14 to 30 feet below mean sea level (MSL). Based on a review of historic groundwater records,the maximum high groundwater elevation underlying the southern and northeastern development area is approximately four feet and ten feet below MSL,respectively. The minimum base grades for the proposed landfill development area have been developed to provide for the required 5-foot separation between historic high groundwater and refuse. The projected total remaining airspace for the Forward Landfill,as of February 2014 is approximately 20.0 million cubic yards (mcy). The proposed expansion would add approximately 7.7 mcy of disposal airspace,which would allow disposal at the Forward Landfill to extend to 2031. While all of the proposed expansion would be Class H landfill space,it is anticipated that Class III waste would be disposed in the expansion areas along with Class H waste. In comparison to the original project,the proposed project is anticipated to significantly reduce most of the environmental impacts identified in the Forward Landfill Expansion Final Environmental Impact Report(Grassetti Environmental Consulting,May 2013). The proposed project adds only 7.7 million cy of landfill capacity versus the 32 million cy in the original project and the projected landfill closure date is 2031 versus 2039 for the original proposed project. The smaller added landfill capacity and earlier closure date reduces air quality,traffic, and noise impacts when compared to the original project. Since development will not extend onto the Brocchini parcel, there will be less potential biological and cultural resource impacts. The impact on visual quality will be similar to existing permitted conditions. The (rduced dvelopment nea si all outsid a 10,000-ft adios from he end of dh ruway at the Stocktn Mtropolitan Arport.It is within lie cordal zne 6 th Stoclon A rport hnd Use Plan but undr he conical stioce. It i1solot orany pBcels with Williamson At Contracts. Eerefore, Lad We impats re sigificantly less Tian lie original pr*ct. Relocate South Branch of the South Fork of Littlejohn Creek z GLA,Inc.,Geotechnical Investigation Report,Forward Landfill Expansion,February 2008.