ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -31- WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -32- CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY SAN JOAQUIN COUNTY lb/day' 1350 2030 --- 3380 Methylene blue active ug/1 500 --- Total Suspended Solids mg/1 20' 30' --- W substances(MBAS) ]b/day' 34 --- --- --- lb/day' 1350 2030 --- 3380 Monthly Weekly 1-Hour Daily Monthly Weekly 1-Hour Daily Constituents Units Average Averaee Average Maximum Constituents Units Average Average Average Maximum Total Coliform MPN/100m1 --- 23' --- 500 Nitrate(as N) mg/1 10 Settleable Solids ml/1 0.1 --- --- 0.2 lb/day' 680 Chlorine Residual mg/1 --- 0.015 0.02 --- Nitrite(as N) mg/1 1 Oil and Grease mg/1 10 --- --- 15 lb/day' 68 lb/day' 680 --- --- 1010 Bis(2-ethylhexyl) ug/1 22 --- --- 44 Aluminum' ug/1 71 --- --- 140 phthalate ]b/day' 4.8 --- --- 9.5 ]b/day' 1.5 --- --- 3 Electrical Conductivity umhos/cm 700' --- --- Bromodichloromethane ug/1 5 --- --- 8 (1 Aprilto3l August) lb/day' 0.34 --- --- 0.54 Electrical Conductivity umhos/cm 1000' --- --- --- Dibromochloromethanee ug/1 1.4 --- --- 2.8 (1 Sept to 31 March) Ammonia (June-Sept) mg N/l 2.1 --- --- 4.4 lb/day' 0.095 --- --- 0.19 lb/day' 140 --- --- 300 Mercury ug/1 --- --- --- --- Ammonia (Oct-May) mg N/l 2.8 --- --- 5.6 lb/year 0.69 --- --- --- lb/day' 190 --- --- 380 2,4,6-Trichlorophenol ug/1 34 --- --- 69 Arsenic ug/1 10 --- lb/day' 2.3 --- --- 4.7 lb/day' 0.68 --- --- --- 1 5-day,20'C biochemical oxygen demand(BOD) 2 To be ascertained by a 24-hour composite Copper ug/1 7.9 --- --- 10.4 3 Based upon a design treatment capacity of 8.11 mgd. lb/day' 0.53 --- --- 0.70 4 Weekly median 5 Expressed as a 4-day average Cyanide ug/1 3.7 --- --- 10 6 The Discharger may conduct a water effect ratio study to develop a site-specific objective,and upon adoption and approval of a Basin Plan amendment,the permit lb/day' 0.25 --- --- 0.68 may be reopened and the aluminum limitation reconsidered. Iron ug/1 300 --- 7 State Water Resources Control Board Decision 1641 requires that the 1000 umhos/cm objective be met year round until 1 April 2005 at which time the lb/day' 20 --- seasonal objectives will be effective. Manganese ug/1 50 --- --- --- 3. Effective 1 February 2009,the effluent concentrations and mass loading shall not exceed lb/day' 3.4 --- the following limits: