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TABLE 7 REASONABLE POTENTIAL ANALYSIS FOR AMMONIA TABLE 8 SEASONAL EFFLUENT LIMITATIONS FOR AMMONIA Effluent data collected from January 1998 through December 2002 Description Ammonia Ammonia Season June 1 to September 30 October 1 to May 31 Effluent Receiving Water Effluent Concentrations(NH3-N) 9 Sample Dates-Begin Jan-98 Jan-98 ammonia data ammonia data Sample Dates-End Dec-02 Dec-02 Time Past 5 years 2002 Sample Count 516 516 Reporting Limits(mg/1) 0.1 0.1 Detection Limit 0.1 mg/L 0.01 mg/L Maximum Reported Concentration(mg/1) 42.8 42.8 Mean(mg/1) 17.70 17.70 Count 516 28 Std.Deviation(mg/1) 7.40 7.40 Concentrations(NH3-N) Coefficient of Variation(CV) 0.42 0.42 Minimum,mg/I 0.0 0.01 Background Concentrations R-1 Maximum,mg/I 42.8 1.4 Sample Dates-Be in Jan-02 Jan-02 Mean,mg/I 17.7 0.2 Sample Dates-End Jan-03 Jan-03 Stand.Deviation,mg/I 7.4 0.3 Sample Count 28 28 CV 0.42 1.3 Count Above Reporting Limits 17 17 RP factor 99% 1.8 4,5 Reportin Limits m/I 0.01 0.01 Maximum Reported Concentration(mg/1 NH3-N) 1.4 1.4 Mean m 11 NH3-N)) 0.21 0.21 acute chronic acute chronic Dilution Ratio 1 4 1 1 Criteria(3) acute chronic acute chronic pH 8.0 8.4 8.0 8.2 RWC,mg/I 77.0 20.3 6.1 6.1 Temperature°C N/A 26 N/A 20.7 Criteria mg/l ammonia as N) 5.62 0.62 5.62 1.2 Temperature max,C 25.7(3) 25.7(3) rel pH max 8(1) 9.1(3) 9.3(2) 9.1(3) Effluent Limit Calculations Dilution Credit 0 4 0 4 Criteria Effluent Concentration Allowance 1'1(mg/1) 5.62 2.24 5.62 5.18 CMC,mg/I 5.6 0.58 and a4 0.161 0.043 0.161 0.043 CCC,mg/I 0.21 0.21 c`2(4) - 0.0058 - 0.0058 ECA Multiplier' 0.43 0.84 0.43 0.84 Reasonable Potential yes yes yes yes Long-Term Average O1 2.4 1.88 2.4 4.35 Notes: AMEL Multiplier e-(a) 1.13 1.19 ` CV Coefficient of Variation=standard deviation/mean Average Monthly Effluent Limit(mg/1) 2.1 2.8 RP factor 99% Reasonable Potential Multiplying Factors:99%Confidence Level and 99%Probability Basis MDEL Multiplier ` 2.35 2.35 [Reference:EPA Technical Support Document,Table 3-1] Max.Daily Effluent Limit(mg/1) 4.4 5.6 RWC Receiving water concentration using mass balance equation= ((max effluent conc.x RP factor)+(dilution ratio-1)x upstream cont.)/dilution ratio General Note:Unless noted otherwise,all concentrations given as mg/1 Ammonia-Nitrogen. [Reference:EPA Technical Support Document,Section 3.3.2 and Box 3-2] (1)Acute pH=maximum permitted effluent pH.Chronic pH=pH at edge of 4:1 mixing zone as calculated by USEPA DESCON CMC Criteria Maximum Concentration program utilizing maxiumum permitted effluent pH and the maximum monthly average pH from Mossdale monitoring station(DWR- CCC Criteria Continuous Concentration ESO-Dl 485C,RSAN087)for Jan.1984 to Sept.2002. (1) Maximum permitted effluent concentration (2)Using CMC and CCC values. (2) Maximum receiving water pH at R-1(See Table 4) (3)Allows for dilution consideration,and is similar to the approach in Section 1.4.6,Step 2 of SIP. (4)Calculated considering daily sampling frequency,Section 5.4.1 of EPA Technical Support Document. (3) Maximum monthly average pH and temperature at Mossdale Landing DWR monitoring station (5)Acute and Chronic ECA Multiplier calculated at 99th percentile level per Sections 5.4.1 and 5.5.4 of TSD. (6)Assumes sampling frequency is 30 times per month. =Not applicable as other criteria LTA is more stringent. (7)LTA`modified to meet 1999 Update recommendation. (8)The probability basis for AMEL is 95th percentile level and for MDEL is 99th percentile level per Section 5.5.4 of TSD. (9)Calculated per Section 5.4.1 of TSD for aquatic life protection.