ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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TABLE 11 TABLE 12 SUMMARY OF HUMAN CARCINOGENIC POLLUTANT STATISTICS Priority Pollutant Effluent Limitations Description copper cyanide arsenic N N � Effluent Concentrations @ o t Sample Dates-Begin Jan-02 Jan-02 Jan-02 t t z Sample Dates-End Dec-02 Dec-02 Dec-02 E E a T Sample Count 12 12 12 0 0 o x Count Above Reporting Limits 12 11 12 O o o t of Samples Above Reporting Limits 100.0 91.7 100.0 >, Reporting Limits p 0.5 3 0.5 0 =a - Maximum Reported Concentration(pg/1) 13 31.0 14.0 E 0 ~ Mean(pg/1) 9.0 7.0 12.5 Sample Date a` Eo N, Std.Deviation(pg/I) 1.9 8.0 1.0 Concentations in ug/1) O m N a Coefficient of Variation(Cv)(pg/1) 0.20 1.18 0.08 09-Jan-02 0.7 2.2 <0.6 2.0 J 07-Feb-02 <0.3 1.3 Background Concentrations Sample Dates-Begin Jan-02 Jan-02 Jan-02 13-Mar-02 <0.3 1 Sample Dates-End Deo02 Dec-02 Deo02 16-Apr-02 <0.3 1 11 7 Sample Count 12 12 12 14-May-02 0.5 2.8 Count Above Reporting Limits 12 3 12 13-Jun-02 0.3 J 2.3 Reporting Limits(pg/1) 0.5 0.6 0.5 09-Jul-02 1.2 3.5 0.9 J 4 Maximum Reported Concentration p 6.1 5.0 3.5 Mean(pg/1) 3.0 1.0 3.0 06-Aug-02 0.4 J 2.2 03-Sep-02 <0.3 1.4 Criteria acute chronic acute chronic acute chronic health 01-Oct-02 <0.3 1.7 <0.6 0.9 J Hardness(mg/l as CaCO3) 170.0 108.0 ---- - --- --- 12-Nov-02 <0.3 1.4 CTR Criteria (pg/1) 22.2 9.6 22 5.2 750 340 11-Dec-02 0.7 3 Basin Plan Objective(pgll)l't 10 10 10 Translator lit 0.96 0.96 n/a We n/a n/a We Sample Count 12 12 4 4 Criteria /1,total recoverable)l0t 10.4 10.0 10 5.2 750 340 10 Max.Concentration(pg/1) 1.20 3.50 11.00 7.00 Mean(pg/1) 0.47 1.98 3.28 3.48 Effluent Limit Calculations Median(ug/1) 0.3 1.95 0.75 3 Dilution Credit 0 4 0 4 0 0 0 Std.Dev. 0.28 0.82 5.15 2.68 Effluent Concentration Allowance'(pg/1) 10.4 25.4 10.00 6.00 750.00 340.00 10 Cv 0.60 0.41 0.60 0.60 a and as 0.04 0.01 0.87 0.30 0.006 0.002 ECA Multiplier(6) 0.64 0.80 0.18 0.33 0.83 0.91 Factor(99th percentile)(') 3.11 3.11 Long-Term Average 6.7 20.3 1.8 2.0 624.8 310.1 Estimated Max. Concentration(Ng/1)(2) 1.38 4.68 34.21 21.77 AMEL Multiplier 1.2 =- 2 ` Human Health Criteria 0.41 0.56 2.1 1.8 Average Monthly Effluent Limit 7.9 10.0 MDEL Multiplierlst 1.6 ` ` ` Max.Dail Effluent Limit 10.4 ` Mean of Reported Background(Ng/1)B) <0.3 <0.2 <0.2 <0.3 General Note:Unless noted otherwise,all concentrations given as total recoverable. (1)Cu and As criteria are dissolved concentrations.Cyanide criteria are total concentrations. Needed Dilution Credit(') 8.9 11.5 16.9 13.3 (2)Metals are expressed as dissolved concentrations.Cyanide is expressed as total concentration. (3)EPA Translators used as default. (1)See USEPA TSD Table 5-2. (4)The total recoverable criteria is based on either the Basin Plan Objective or CTR,whichever is lower. (2)For 10 samples or more,the estimated maximum concentration is the mean plus 3.3 standard (5)ECA calculated per Section 1.4.8,Step 2 of SIP.This allows for the consideration of dilution. (6)Acute and Chronic ECA Multiplier calculated at 99th percentile per Section 1.4.6,Step 3 of SIP or per Sections 5.4.1 and 5.5.4 of the deviations. For less than 10 samples,the estimated maximum concentration is the maximum TSD. observed concentration times the factor from Table 5-2. (7)Assumes sampling frequency n=>4. (3)MDL utilized for receiving water detection limit. (8)The probability basis for AMEL is 95th percentile per Section 1.4.B,Step 5 of SIP or Section 5.5.4 of the TSD. (9)The probability basis for MDEL is 99th percentile per Section 1.4.B,Step 5 of SIP or Section 5.5.4 of the TSD. (4)DIIU110n=(Est.max.conc.-HH Cflterla)/(HH criteria-background CODC.) =Not applicable as other criteria LTA is more stringent.