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California RRional Water Quality control Board vCentral Valley Region a Robert Schneider,Chair ""' Winston H.Hickox Gray Davis Secretaryfor Sacramento Main Office Governor Environmental intemet Address: http://www.swrcb.ca.gov/rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000-FAX(916)2SS�'n C IllUl11 13 February 2001 Mr. Matt Machado, P.E. FEB 14 2001 City Engineer- City of Ripon 259 N. Wilma Ave. ENVIRONNi q'._1H Ripon, California 95366 PERMIT/,_, _, _3 REQUEST FOR REPORT PURSUANT TO SECTION 13267 OF THE CALIFORNIA WATER CODE, CITY OF RIPON WASTEWATER TREATMENT PLANT, SAN JOAQUIN COUNTY Enclosed is a report summarizing staff s 30 January 2001 inspection of the City's facility. A site inspection photograph log is enclosed with this letter. The City is in the process of construction activities at the wastewater treatment plant. All of the ponds located east of the existing headworks have been emptied, scraped clean of sludge, and will be reconfigured into four large ponds. The following observations were made during the site inspection: • The City has purchased a parcel of land north of the corporation yard. The land will be developed into a stormwater retention basin and a new City building. • The City operates several wastewater lift stations, two of which are considered major lift stations. The Acacia lift station is located near the wastewater system headworks, the other station is located at Doak Boulevard. Both stations are equipped with redundant pumps, emergency generators, and alarms. Mr. Ted Johnston stated that autodialers will be added to the lift stations in the near future. • All wastewater is being discharged to the interim ponds. Three brush aerators were installed in the first pond, one brush aerator was installed in the second pond, and no aerators existed in the third pond. No odor was noted in the vicinity of the ponds. • The freeboard of all the ponds was acceptable. Some erosion was noted along the south shoreline of the ponds. • Wastewater is not chlorinated prior to disposal. • Industrial wastewater is discharged to the City wastewater treatment system by Nestle and Nulaid. The Nestle wastewater is generated by a groundwater extraction system being operated to cleanup a groundwater solvent plume; the groundwater is treated prior to discharge to the City system. Nulaid wastewater is generated in industrial activities and is discharged to the City system without pretreatment. • The industrial wastewater normally percolates and evaporates at the industrial wastewater percolation area. The percolation area is located within the 100-year flood zone. When the California Environmental Protection Agency ca Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at htrp://www.swrcb.ca.gov/mgcb5