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• • WASTE DISCHARGE REQUIREMENTS -g- J. R SI PLOT COMPANY LATHROP, SAN JOAQUIN COUNTY the buildup of hydraulic head on the underlying liner. The depth of fluid in any LCRS sump shall be kept at the minimum needed to ensure safe pump operation, as specified in the approved engineered drawings and specifications. SUPERVISION AND CERTIFICATION OF CONSTRUCTION 9. All containment structures shall be designed and constructed under the direct supervision of a California registered civil engineer or a cer ifidd engineering geologist and shall be certified by that individual as meeting the prescriptive standards and performance goals of Chapter IS prior to waste discharge. a WATER QUALITY PROTECTION STANDARDS 10, The Water Quality Protection Standard, as defined in Title 27, 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 Title 27. .Constitu.ents 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.§7:--229. 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 H 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. 25, above. 13. Annually, prior to the anticipated rainy-sdason but no later than 15 October, any necessary erosion control measures shall be implemented, and any necessary construction, maintenance,