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REVISED CLEANUP AND ABATEMENT ORDER NO. 5-01-703 -6- CITY 6- CITY OF RIVERBANK WASTEWATER TREATMENT PLANT STANISLAUS COUNTY f. The Discharger considered a connection ban on all new development. During the inspection, staff observed that (with the exception of the Winter Aeration Cell), the freeboard in all ponds was significantly less than the required two feet. There was seepage at the toe and saturation at the crest of the northern berm,but no overt evidence of impending catastrophic failure. The western berm was also saturated and showed evidence of recent temporary leak repairs. Due to the oversteepened exterior and interior slopes and sandy material used in berm construction,this berm appeared vulnerable to sudden failure due to piping,wave erosion, and/or animal burrows. The Winter Aeration Cell, which has very little storage capacity, was being drained in preparation for the headworks retrofit project. 24. Based on the facts presented above, the Executive Officer issued Cleanup and Abatement(C&A) Order No. 5-01-073 to the Discharger on 4 April 2001. The C&A Order required the Discharger to complete the following tasks by specified due dates: a. Submit a Contingency Plan describing interim measures necessary to prevent unauthorized discharges until all permanent improvements and retrofitting are complete. b. Contain seepage from the Winter Aeration Cell and Summer Pond 1 and ensure that the waste is returned to the treatment plant and submit a report describing the actions taken to comply with this requirement. c. Submit a Cleanup and Abatement Order Status Report that describes the Discharger's progress in completing each cleanup and abatement measure required by this Order. d. Implement the Contingency Plan and submit a technical report describing the actions taken to comply this requirement. e. Complete a subsurface investigation of the northern berm of the Summer Aeration Cell and Summer Pond 1 and perform a slope stability analysis. Submit a geotechnical engineer's report specifying the specific problems identified and recommended method(s) of retrofit or operational modification. f Complete permanent repairs to the western berm of Summer Ponds 2 and 3 to prevent seepage and/or failure, and submit a technical report describing the actions taken to comply with this requirement. g. Complete discing/ripping of all ponds and submit a report providing the results of percolation tests for each pond to determine the actual percolation rate. h. Complete the headworks reconstruction and submit a technical report describing the actions taken to comply with this requirement. i. Complete the Winter Aeration Cell rehabilitation project described in Finding No. 8 and submit a technical report describing the actions taken to comply with this requirement. j. Complete the storm drain segregation project described in Finding No. 9 and submit a technical report describing the actions taken to comply with this requirement. k. Submit a revised Water Balance and Disposal Capacity Calculation Report that calculates the current disposal capacity of the wastewater treatment plant. 25. The Discharger completed the above tasks in a timely fashion, and all reports were adequate.