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WASTE DISCHARGE REQUIREMENTS -6- SOUTHWEST HIDE COMPANY SURFACE IMPOUNDMENT CLOSURE SAN JOAQUIN COUNTY Supervision and Certification of Construction 12. All containment structures shall be designed and constructed under the direct supervision of a California registered civil engineer or a certified engineering geologist and shall be certified by that individual as meeting the prescriptive standards and performance goals of Chapter 15 and the approved design plans and specifications prior to waste discharge. 13. Water used for facility maintenance shall be limited to the minimum amount necessary for dust control . Water Quality Protection Standard 14. The Water Quality Protection Standard, as defined in §2550.2 of Chapter 15, shall consist of constituents of concern, their concentration limits, the point 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 WMUs. 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 WMUs and whether the WMUs are in compliance with the Water Quality Protection Standard using procedures specified in §2550.7(e) of Chapter 15. Constituents of concern and monitoring parameters, their concentration limits, the point of compliance, and all water quality monitoring points are specified in Monitoring and Reporting Program No. Protection from Storm Events 15. Waste management units shall be designed, constructed, and operated to prevent inundation or washout due to floods with a 100-year return period. Landfill 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 100-year, 24-hour precipitation conditions. 16. Surface drainage from tributary areas and internal site drainage from surface or subsurface sources shall not contact or percolate through wastes.