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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 5-00-142 WASTE DISCHARGE REQUIREMENTS FOR CITY OF ESCALON ESCALON WASTEWATER TREATMENT PLANT SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region (hereafter Board), finds that: 1. The City of Escalon.(hereafter Discharger) submitted a Report of Waste Discharge, dated 29 February 2000, and supplemental information dated 30 March 2000, for an expansion of the industrial portion of its wastewater treatment plant (WWTP). 2. The wastewater treatment facility is at 25100 West River Road, Escalon, in Sections 17 and 20, T2S, R9E, MDB&M, as shown in Attachment A, which is attached hereto and made part of this Order by reference. The facility is on Assessor's Parcel Numbers 247-090-36 and 247-090-38, which are both owned by the City of Escalon. 3. Waste Discharge Requirements Order No. 95-170, adopted by the Board on 23 June 1995, prescribes requirements for discharge of treated effluent from the City of Escalon WWTP to evaporation and percolation ponds on the property. Because of increased flows to the WWTP, and facility improvements at the site, Order No. 95-170 is not adequate and requires amendment. 4. The WWTP treats industrial wastewater generated by vegetable processing industries and domestic wastewater generated by the City of Escalon. The treatment process consists of screening and discharge to mechanically aerated treatment ponds, followed by discharge to evaporation/percolation ponds. The ponds, and proposed improvements, are shown in Attachment B, which is attached hereto and made part of this Order by reference. 5. The industrial and domestic wastewater flows are delivered to the plant in separate pipes, are treated in separate ponds, and are discharged to separate evaporation/percolation ponds. Stormwater from a limited portion of the City of Escalon is piped to the facility and is discharged to the industrial ponds. 6. The Discharger treats domestic wastewater in five treatment ponds, all of which are. mechanically aerated. The domestic wastewater is disposed in two evaporation/percolation ponds (Nos. 21 and 24). Pond No. 21 provides 4.4 acres of surface area and 11.3 million gallons of storage capacity. Pond No. 24 provides 4.7 acres of surface area and 11.1 million gallons of storage capacity. 7. Prior to recent upgrades, the treatment plant was designed to treat domestic wastewater average dry weather flows of up to 0.55 million gallons per day (mgd) and peak wet weather flows of 1.0 mgd.