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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2014-0006 -31- FORWARD INC.AND REPUBLIC SERVICES INC. FORWARD CLASS it LANDFILL SAN JOAQUIN COUNTY 8. Irrigation tail water or storm water runoff from the land application area shall not enter any surface water drainage course or storm water drainage system. 9. Water in Surface Impoundments shall contain at least 1.0 mg/L Dissolved Oxygen. 10.The minimum freeboard on October 15 of each year shall be 4.73 feet for WMU F- North and 5.51 feet for WMU F-West. 11 . The Discharger shall develop and implement an approved operations and maintenance plan for the Class II surface impoundments at the site as required under Title 27 regulations. At a minimum, the plan shall address: a. expected flows and liquids balance calculations; b. expected waste types and commingling; c. contingency plans in the event of facility breakdown or failure; d. seasonality issues; e. inspection and maintenance programs; f. and other information relevant to impoundment operations and maintenance that could potentially affect water quality. 12.Solids that accumulate in the Class II surface impoundment if any shall be periodically removed to maintain minimum freeboard requirements. Prior to removal of these solids, sufficient samples shall be taken for their characterization and classification pursuant to Article 2, Subchapter 2, Chapter 3, Division 2 of Title 27. The rationale for the sampling protocol used, the results of this sampling, and a rationale for classification of the solids shall be submitted to Central Valley Water Board staff for review before the discharge of the solids. D. CONSTRUCTION SPECIFICATIONS 1. The Discharger shall construct the base liner and side slope liner of new Class II/Class III landfill units as described in Finding 6 of this Order in accordance with the following approved prescriptive base liner and the approved engineered alternative side slope liner design: a. A composite base liner system that is comprised, in ascending order, of the following: 1) Prepared subgrade of graded and compacted, fine grained native soil; ® 2) a 24-inch thick, low permeability soil layer (minimum permeability of 1 X 10-7 cm/sec);