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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-OOXX 12 FORWARD, INC. FORWARD LANDFILL SAN JOAQUIN COUNTY 29. Intermediate cover generally consists of soil placed and compacted to a depth of at least 12 inches. The proposed use of an alternative intermediate cover (AIC) would require a site-specific demonstration project and approval of the LEA with concurrence by CalRecycle. Surface Impoundments 30. Liquid wastes will be discharged to one of two existing surface impoundments (WMU F North and WMU F West) and two proposed Class II surface impoundments (WMU F South and WMU F East). See Table 1 for additional information regarding existing and proposed surface impoundments as well as Attachment G for locations. If leachate production exceeds impoundment capacity at any impoundment, excess leachate will be contained in temporary on- site, above ground tanks. No liquids generated offsite will be discharged to the impoundments without prior approval of the Central Valley Water Board. Discharges to Class II surface impoundments may include the following: a. Leachate from the landfill units and surface impoundments; b. Landfill gas condensate from the LFG extraction system; C. Impacted storm water runoff from the landfill and associated facilities; d. Cannery rinse water; and/or e. Other liquid wastes that are compatible with the liner system and approved by Board staff. All Class II surface impoundment LCRSs are required to be tested annually. 31. Facility Specification C.6 requires that the Discharger operates the Class II impoundments so that on October 15 of each year a freeboard of at least 4.74 feet and 5.53 feet in WMU F North and WMU F West, respectively. This corresponds to two feet plus the calculated rise in liquid level associated with an average annual storm season according to the ROWD/JTD. Title 27 section 20320 subdiv. (e), Table 4.1, and section 20375 requires the Class 11 surface impoundment to be sited and designed to a 1,000-year, 24-hour storm event. 32. The Discharger proposed additional surface impoundments, WMU F South and WMU F East, for the Facility. The Discharger must submit design reports and CQA plan for Central Valley Water Board approval, prior to discharging waste to the unit. See Section I, Table 11 Item 4.