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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -6- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY WASTE CLASSIFICATION AND UNIT CLASSIFICATION 24. The landfill accepts wastes defined as “inert” and “nonhazardous” under Title 27, sections 20230 and 20220, respectively. The landfill also accepts MSW as defined in Title 27, Section 20164. The landfill does not accept (and is not authorized to accept) hazardous or designated wastes, which are diverted from the landfill under the facility’s waste exclusion program. Recyclable wastes are generally diverted from the landfill at offsite transfer stations. 25. The landfill is also not authorized to accept liquid or semi-solid wastes, except for leachate and landfill gas condensate generated from and returned to LF-2 (see Findings 82 and 83); nonhazardous de-watered sewage/septage sludge discharged in accordance with Title 27, sections 20200(d) and 20220(c); and certain inert wastes. The landfill does not currently accept sewage/septage wastes, but is considering a plan to do so in the future at M-1 and future expansion modules. See SPRR, Standard Prohibition C.1.b. The County is also considering the use of dewatered sewage sludge as alternative daily cover (ADC). Any such proposal will include California Environmental Quality Act (CEQA) and other submittal documentation for review of the executive Officer. See Finding 80. 26. Approximately 600 tons per day (210,000 tons per year) of wastes, including MSW, agricultural, commercial, construction and demolition, and industrial wastes, were discharged to the landfill in 2014. About 12.8 million cubic yards (CY) of waste are estimated to be in place at the landfill corresponding to about 10% of the landfill’s estimated capacity at build-out. 27. The lowest elevation of solid waste at the landfill is about 222 feet mean sea level (MSL), corresponding to the inlet to the LCRS sump in the southeast corner of M-1. The lowest elevation of leachate at the landfill is 216 feet MSL corresponding to the bottom of the LCRS sump at Module 1. The maximum height of the landfill waste column is approximately 180 feet MSL. 28. LF-1 is an “existing” unit under Title 27 because it was an operating landfill at the time former Chapter 15 (now Title 27) regulations came into effect (27 November 1984) and was not subsequently reconstructed (e.g., retrofitted with a base liner) to meet Chapter 15 standards. Similarly, LF-2 (i.e., Module 1 and future LF-2 modules) is a “new” unit under Title 27 because construction of LF-2 began on or after the effective date of Chapter 15 regulations and the unit was required to be lined. See Title 27, section 20080(d). Also, LF-1 is an “existing MSWLF unit” and LF-2 is a “lateral expansion” of an existing unit. See Title 27, section 20164 (Specific Definitions). 29. Previous WDRs Order 89-018 reclassified LF-1 from a Class II-2 landfill unit under former Subchapter 15 regulations to a Class III landfill unit under Chapter 15 regulations. The reclassification was based on a finding that the