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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 77 <br />FORWARD, INC. <br />FORWARD LANDFILL <br />SAN JOAQUIN COUNTY <br />STANDARD PROVISIONS & REPORTING REQUIREMENTS <br />5.Materials used in containment structures shall have appropriate chemical <br />and physical properties to ensure that such structures do not fail to contain <br />waste because of pressure gradients, physical contact with waste or <br />leachate, chemical reactions with soil or rock, climatic conditions, the <br />stress of installation, or because of the stress of daily operations [Title 27, <br />§ 20320(a)]. <br />6.Waste management units and their respective containment structures <br />shall be designed and constructed to limit, to the greatest extent possible, <br />ponding, infiltration, inundation, erosion, slope failure, washout, and <br />overtopping [Title 27, § 20365(a)]. <br />7.The Discharger shall design storm water conveyance systems for Class III <br />units for a 100-year, 24-hour storm event, and shall design storm water <br />conveyance systems for Class II units for a 1,000-year, 24-hour storm <br />event [Title 27, § 21750(e)(3)]. <br />8.All Class III landfill units shall be designed to withstand the maximum <br />probable earthquake and Class II waste management units shall be <br />designed to withstand maximum credible earthquake without damage to <br />the foundation or to the structures that control leachate, or surface <br />drainage, or erosion, or gas [Title 27, § 20370(a)]. <br />9.The Discharger shall perform stability analyses that include components to <br />demonstrate the integrity of the landfill foundation, final slopes, and <br />containment systems under both static and dynamic conditions throughout <br />the landfill’s life including the closure period and post-closure maintenance <br />period [Title 27, § 21750(f)(5)]. <br />10.New waste management units and expansions of existing units shall not <br />be located on a known Holocene fault [Title 27, § 20260(d)]. <br />11.Liners shall be designed and constructed to contain the fluid, including <br />landfill gas, waste, and leachate [Title 27, § 20330(a)]. <br />12.Hydraulic conductivities shall be determined primarily by appropriate field <br />test methods in accordance with accepted civil engineering practice. The <br />results of laboratory tests with both water and leachate, and field tests with <br />water, shall be compared to evaluate how the field permeabilities will be <br />affected by leachate. It is acceptable for the Discharger to use <br />appropriate compaction tests in conjunction with laboratory hydraulic <br />conductivity tests to determine field permeabilities as long as a reasonable <br />number of field hydraulic conductivity tests are also conducted [Title 27, <br />§ 20320(c)].