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WASTE DISCHARGE REQU ,:EMEMTS ORDER NO. 5-00-142 ( -2- <br /> CITY OF ESCALON <br /> ESCALON WASTEWATER TREATMENT FACILrIY <br /> SAN JOAQUIN COUNTY <br /> C <br /> 8. A report prepared by Dewante and Stowell titled, "Wastewater Treatment Facilities <br /> Improvement and Expansion," dated April 1990, identified improvements at the WWTP that <br /> could increase capacity and treatment. Improvements that were implemented included <br /> construction of Pond Nos. 21 and 24, addition of mechanical aeration, and piping <br /> improvements. The improvements resulted in additional storage capacity of 22.4 million <br /> gallons and 9.1 acres of surface area to the existing domestic wastewater treatment system. <br /> Based on the information in the Dewante and Stowell report, the domestic wastewater <br /> treatment facility is designed to treat 0.90 million gallons a day. <br /> 9. The Discharger does not disinfect effluent prior to discharge to the evaporation/percolation <br /> ponds. <br /> 10. The Discharger treats industrial wastewater in four treatment ponds, all of which are <br /> mechanically aerated. The industrial wastewater is then discharged to ten <br /> evaporation/percolation ponds (Nos. 10 through 19). The approximate surface area and <br /> storage capacity is presented below: <br /> Surface Area Storage Capacity <br /> Pond Number acres (millions ofgallons) <br /> 1 2.8 5.4 <br /> 2 1.7 1.7 <br /> 3 1.8 1.8 <br /> 4 2.3 3.0 <br /> 10 1.1 2.2 <br /> 11 2.1 6.1 <br /> 12 1.8 4.7 <br /> 13 1.8 2.8 <br /> 14 1.3 2.0 <br /> 15 1.0 1.5 <br /> 16 2.1 2.7 <br /> 17 2.9 3.7 <br /> 18 2.7 3.3 <br /> 19 2.7 3.3 <br /> Totals 28.1 44.2 <br /> Data from City of Escalon, Treatment Plant Storage Map, dated 1/17/97. <br /> 11. The treatment plant was designed to treat industrial wastewater average dry weather flows up <br /> to 2.0 mgd and peak wet weather flows of 3.0 mgd. The monthly average dry weather <br /> maximum industrial flow rate was exceeded in August, 1999; the maximum daily industrial <br /> flow rate was exceeded in September and October, 1999. <br /> 12. The Discharger allows the industrial wastewater ponds to dry completely prior to initiation of <br /> the industrial wastewater generation season. The ponds are disced and ripped annually to <br /> maintain percolation rates. <br />