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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 77 WASTE DISCHARGE REQUIREMENTS FOR CITY OF MANTECA FE B 8 1992 SLUDGE APPLICATION TO LIM� SAN JOAQUIN COUNTY 1. The City of Manteca (hereafter Discharger) submitted a Report of Waste Discharge, dated 18 September 1991, and a Sludge Management Plan, dated July 1991, for a project that will use municipal wastewater treatment plant sludge. The Discharger applies stabilized sewage sludge and wastewater effluent from its wastewater treatment plant to 224 acres of fields owned by the Discharger and 93 acres owned by Mr. Anthony K. D'utra. The Discharger's acreage is leased to Mr. Dutra for farming. The Assessor's Parcel Nos. for the site are 241-300-47, 48, 49, and 50, 241-31Q-16, 18, 32, 44, 48 52, 53 and 54, and 241-320-01. 2. The Discharger applies stabilized wastewater treatment plant sludge from the City of Manteca Water Quality Control Facility (WQCF) in Manteca, California to cropland as a soil amendment. The Discharger also discharges effluent from the City of Manteca plant to the cropland during the months of April through October. The application of the effluent is at agronomic rates. The City of Manteca facility is regulated by Waste Discharge Requirements Order No. 91- 110, NPDES permit No. CA0081558. The City of Manteca WQCF is in the process of developing an EPA approved pretreatment program. A 3. The Sludge Management Plan meets the regulations and guidelines found in 40 CFR 257, "Criteria for Classification of Solid Waste Disposal Facilities and Practices', U.S. Environmental Protection Agency (EPA), September 1987, and the Manual of Good Practices for Lanspreading of Sewage Sludge, Department of Health Services, Sanitary Engineering Branch, April 1983. T 4. EPA proposes to amend 40 CFR 257 to exclude sewage sludge and to simulta- neously promulgate comprehensive technical standards for the use and disposal of sewage sludge under 40 CFR 503 (Proposed Rule, 6 February 1989), pursuant to Section 405(d) of the Clean Water Act (CWA). While this Order implements 40 CFR 257, proposed 40 CFR 503 was used as guidance and, if promulgated, will be implemented by reference and through modification of these requirements. 5. Air-dried, anaerobically digested sludge of greater than 50% solids is applied to approximately 317 acres of farm land, as shown on Attachments A and B, which are included as part of this Order. Sludge application has been estimated to be up to 2.1 dry tons per acre per year at the current plant output, and will increase to 3.3 dry tons per acre per year by the year 2000 as the wastewater treatment plant increases its volume of treated water. Loading rates will be established based on crop utilization and limitations imposed by annual and/or cumulative metal loading criteria. Sludge/soil mixture will not be allowed to exceed maximum soluble metal concentrations to protect ground water. Nutrients and trace metals associated with the wastewater effluent and any added fertilizer will considered in determining appropriate allowable sludge loading rates. Wastewater effluent volumes will