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• Draft Supplemental Environmental Impact Report Page III-34 • Forward Inc. Landfill 2018 Expansion Project • regulatory requirements. The proposed landfill expansion refuse fill grades meet both State and • Federal regulatory criteria under both static and seismic conditions 10 • 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 January 2017,was approximately 16.6 million cubic yards(mcy). The proposed expansion would add approximately • 8.42 mcy of disposal airspace,which would allow disposal at the Forward Landfill to extend to 2036, from the current anticipated closure date of 2030. While all of the proposed expansion would • be Class II landfill space,it is anticipated that Class III waste would be disposed in the expansion • areas along with Class II waste. • The proposed 2018 Expansion Project would add 8.42 million cy of landfill capacity, compared to the 32 million cy in the previously proposed (2013)project. The projected landfill closure date • under the 2018 Expansion Project is 2036, compared to 2039" for the previously proposed project. . The 2018 Expansion Project would not entail putrescible waste (waste streams other than concrete, rock, asphalt, wood and yard waste) in the Outer Approach of the Stockton Metropolitan Airport, expansion of landfilling operations to within 10,000 feet of the end of the • usable runway of the Stockton Metropolitan Airport, or expansion of landfilling operations on • to any parcels of land under Williamson Act contract. • Relocate South Fork of South Littlejohns Creek • • To create a contiguous disposal area and optimize landfill airspace, an approximately 3,000-foot • reach of the South Fork of South Littlejohns Creek would be relocated to a new 3,400-foot long • reach to be constructed along the eastern and southern boundaries of the landfill (see Figures III.C- 4, IILC-5, and III.0-6). The existing creek traversing the landfill is generally a trapezoidal channel • with 10-to 12-foot banks and a 10-to 15-foot bottom width. The channel measures, on average, 60 feet from bank top to bank top. This equates to a 4.13-acre creek zone. According to the • °GLA,Inc., Geotechnical Investigation Report,Forward Landfill Expansion, February 2008. • The 2013 FEIR estimated closure dates with and without that project of 2039 and 2021,respectively. It • should be noted that landfill closure dates are approximate and can vary greatly based on many factors • such as the economy and density of wastes being disposed. • • • • •