SITE INFORMATION AND CORRESPONDENCE

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WASTE DISCHARGE REQUIREMENTS FOR -9- CITY OF TRACY CLASS II LAND TREATMENT FACILITY SAN JOAQUIN COUNTY waste contained in the treatment cells. Concentration limits in each medium shall consist of background concentrations of each constituent of concern or concentrations greater than background pursuant to §2550.4 of Chapter 15. For each monitoring event, the Discharger shall determine whether there is statistically significant evidence of a release from the treatment unit and whether the treatment unit is 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 quality monitoring points are specified in Monitoring and Reporting Program No. 94-_. Protection from Storm Events 11. Land treatment units shall be designed, constructed, and operated to prevent inundation or washout due to floods with a 100-year return period. The Class R waste piles and related containment structures shall be constructed and maintained to prevent, to the greatest extent possible, ponding, inundation, erosion, slope failure, and washout under 1,000-year, 24-hour precipitation conditions. 12. Precipitation and drainage control systems shall be designed and constructed to accommodate the anticipated volume of precipitation and peak flows from surface runoff under 1,000-year, 24-hour precipitation conditions, as described in Specification No. 11 above. 13. Surface drainage from tributary areas and internal site drainage from surface or subsurface sources shall not contact or percolate through wastes. 14. 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 and to prevent surface drainage from contacting or percolating through wastes. Land Treatment Unit Closure Specifications 15. The closure of the Class II Land Treatment units shall be under the direct supervision of a California registered civil engineer or certified engineering geologist.