SITE INFORMATION AND CORRESPONDENCE

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CLEANUP AND ABATEMENT COR NO. 5-01-703 45 -9 - CITY 9 - CITY OF RIVERBANK WASTEWATER TREATMENT PLANT STANISLAUS COUNTY e. Direct precipitation and runoff contributions, using the 100-year annual total precipitation distributed monthly in accordance with historical mean monthly precipitation data. f. Evaporation (based on 80% of established pan evaporation rates for the vicinity). g. A continuous minimum freeboard of two feet in each pond. The water balance shall be supported by documentation showing the source of all climactic and operations data used. If the water balance shows that additional permanent storage is needed, the report shall include a preliminary(conceptual)design for the additional permanent storage facilities and a detailed schedule for engineering design, permitting and construction. 12. By 30 April 2002, the Discharger shall complete discing/ripping of the Winter 1, 2, 3, and 4 percolation ponds and shall submit a report providing the results of percolation tests for each pond to determine the actual percolation rate. The percolation rate shall be determined using the American Society for Testing and Materials (ASTM) Standard Test Method D 5093-90, D 3385- 94, or other method approved by the Executive Officer. A minimum of one site per pond shall be tested. 13. By 30 June 2002, the Discharger shall submit a second revised Water Balance and Disposal Capacity Calculation Report that calculates the current disposal capacity of the wastewater treatment plant. The calculation shall be performed in accordance with Paragraph 11 and shall include the long-term percolation values for the winter ponds based on testing conducted to comply with Paragraph 12 above. 14. By 30 August 2002, the Discharger shall complete permanent repair of the northern berm of the Winter Aeration Cell and Summer 1 Pond in accordance with the recommendations of a California-registered Geotechnical Engineer, and shall submit a technical report describing the actions taken to comply with this requirement. 15. By 30 August 2002, the Discharger shall submit a Report of Waste Discharge(RWD) to apply for revised Waste Discharge Requirements for the proposed permanent facility expansion. The RWD shall be accompanied by a draft CEQA document for the expansion and a proposed schedule for certification of that document. 16. By 30 October 2003, the Discharger shall certify that the plant expansion has been completed and that all capacity-related problems have been fully resolved. In addition to the above, the City of Riverbank shall comply with all applicable provisions of the California Water Code that are not specifically referred to in this Order. As required by the California Business and Professions Code Sections 6735, 7835, and 7835.1, all reports shall be prepared by, or under the supervision of, a registered professional engineer and signed by the registered professional. If, in the opinion of the Executive Officer, the City of Riverbank fails to comply with the provisions of this Order, the Executive Officer may refer this matter to the Attorney General for judicial enforcement or may issue a complaint for administrative civil liability.