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WASTE DISCHARGE REQUOMENTS ORDER NO. R5-2004-002* -34- <br /> CITY OF MANTECA, CITY OF LATHROP AND DUTRA FARMS <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> Monthly Weekly 1-Hour Daily <br /> Constituents Units Avera e Average Avera e Maximum <br /> Methylene blue active ug/1 500 --_ --- <br /> substances(MBAS) <br /> lb/day' 41 -- — <br /> Nitrate (as N) mg/1 10 --- --- --- <br /> lb/day' 820 --- --- --- <br /> Nitrite(as N) mg/1 1 -- --- --- <br /> lb/day' 82 --- --- --- <br /> Bis(2-ethylhexyl) ug/1 22 ___ __ 44 <br /> phthalate <br /> lb/day' 1.8 --- --- 3.6 <br /> Bromodichloromethane ug/1 5 --- --- 8 <br /> lb/day' 0.41 --- --- 0.66 <br /> Dibromochloromethane ug/1 1.4 --- --- 2.8 <br /> lb/day' 0.12 -- --- 0.23 <br /> Mercury ug/1 — -- <br /> lb/year 0.69 -- <br /> 2,4,6-Trichlorophenol ug/1 34 --- --- 69 <br /> lb/day' 2.8 --- --- 5.7 <br /> 1 5-day,20°C biochemical oxygen demand(BOD) <br /> 2 To be ascertained by a 24-hour composite <br /> 3 Based upon a design treatment capacity of 9.87 mgd. <br /> 4 Weekly median <br /> 5 Does not exceed 23 in more than one sample in any 30-day period. No sample <br /> shall exceed 240. <br /> 6 Does not exceed an average of 2 NTU within a 24-hour period. <br /> 7 Does not exceed 5 NTU more than 5 percent of the time within a 24-hour period <br /> and 10 NTU at any time. <br /> 8 Expressed as a 4-day average <br /> 9 The Discharger may conduct a water effect ratio study to develop a site-specific <br /> objective, and upon adoption and approval of a Basin Plan amendment,the permit <br /> may be reopened and the aluminum limitation reconsidered. <br /> 4. The arithmetic mean of 20°C BOD (5-day) and total suspended solids in effluent samples <br /> collected over a monthly period shall not exceed 15 percent of the arithmetic mean of the <br />