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WASTE DISCHARGE REQUIREMENTS 7 J. R. SIMPLOT COMPANY LATHROP, SAN JOAQUIN COUNTY WATER QUALITY PROTECTION STANDARDS 10. The Water Quality Protection Standard, as defined in Section 2550.2 of Chapter 15, shall consist of constituents of concern, their concentration limits, the point(s) of compliance, and all water quality monitoring points. Constituents of concern shall include all waste constituents, their reaction products, and hazardous constituents that are reasonably expected to be in or derived from waste contained in the waste management units. Concentration limits shall consist of background concentrations of each constituent of concern in each monitoring medium. For each monitoring event, the Discharger shall determine whether there is statistically significant evidence of a release from the waste management units, and whether the waste management units are in compliance with the Water Quality Protection Standard using procedures specified in Section 2550.7(e) of Chapter 15. Constituents of concern and monitoring parameters, their concentration limits, the point(s) of compliance, and all water quality monitoring points are specified in Monitoring and Reporting Program No. PROTECTION FROM STORM EVENTS 11. Waste management units shall be designed, constructed, and operated to prevent inundation or washout due to floods with a 100-year return period. Class 11 surface impoundments, and related containment structures shall be constructed and maintained to prevent, to the greatest extent possible, ponding, infiltration, inundation, erosion, slope failure, washout, and overtopping under 1000-year 24-hour precipitation conditions and the 100-year wet season without using the required two feet of freeboard. 12. Precipitation and drainage control systems for the Class H surface impoundments shall be designed and constructed to accommodate the anticipated volume of precipitation and peak flows from surface runoff under 1000-year, 24-hour precipitation conditions as described in Finding No. 26 above. 13. Annually, prior to the anticipated rainy season but no later than 15 October, any necessary erosion control measures shall be implemented, and any necessary construction, maintenance, or repairs of precipitation and drainage control facilities shall be completed to prevent erosion or flooding of the facility. SURFACE IMPOUNDMENT SPECIFICATIONS 14. Design and construction plans and specifications shall be submitted to the Board for approval before retrofitting existing ponds to Class II standards. After construction, a construction quality assurance report shall be submitted to the Board and approved by Board staff prior to operation of the impoundment. 15. The surface impoundments shall have liner systems consisting, at a minimum, of a synthetic liner of 40-mil minimum thickness underlain by an LCRS and a second synthetic liner of 40-mil minimum thickness. 16. The surface impoundments shall be designed, constructed, and operated to maintain a freeboard of two (2) feet after receiving the rainfall and leachate produced from a 1000 year, 24 hour precipitation event or the 100-year wet season precipitation, whichever is greater. At no time shall the freeboard of an impoundment be less than two feet.