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Steve Royall NCPA CT-2 Discharge Characterization Page 5 of 6 January 22,2007 Table 4 - Constituents with Effluent Concentratons Higher than Influent Northern California Power Agency, Roseville, Placer County - Samples collected July 20, August 2, 3, 10, September 26, and November 16 2006 WATER QUALITY PARAMETER ANALYTICAL METH00 RESULTS OF ANALYSIS QA 1 QC Practical Constituent Analytical method used Results of Analysis Quantation Limit Influent Effluent Units Influent Effluent Influent Effluent Greater than a four-fold increase 1 Co er 3014A!200.7 APDClICP MS uglL l 1.52 1 10.4 _ O.02 0.02 Nitrite - ---_._.. ..__. --_ EPA3O0.0 -EPA300.0 mnr/L !1.9 -' 34.3 - - 0.3 0.3 Less than a four-fold increase Mercury 1631 E 1531 E u L 0.0028 0.0072 0.0005 0.0005 Phosphorus,Total(s PJ EPA300.0 EP .1 rn L ! 0.5 1.6 J._ 0.1 0.5 Less than a twofold increase Fluoride EPA300 EPA300 mglt_ 0.6 0.9 0.1 0.1 Iron 301 OA 1200.7 ! 301 OA 1200.7 m 0,23 0.32 _ 0.050.05 Manganese ---- -- 301 OA 1200.7 i 301 OA 1200.7 mg1L 0.07 0.11 0.01 _ 0.0_1_ Nickel - -- 301 OA 1200.7 ! 301 OA 1200.7 0.08 0.09 0.01 0.41 Sodium W _ �- 301 DA 1200.7 301 OA 1200.7 mg1L 184 196 1 1 Zinc 3010A 1200.7 3010A 1200.7 0.06 1 0.07 0.02 0.02 Alkalinity (as CaCO,) 23208 23208 mg1L 310 380 16 10 Bicarbonate 23208 1 380 460 10 Y 10 Total Disolved Solids(TI)S) 2540C 25440 m L 1020 1060 40 40 Specific conductance(EC) W 2510B 25108 umhoslcm 1440 1510 1 1 1 Chloride EPA300.0 1 EPA300.0 m L 158 171 W 5 5 Sulfate �. EPA300.0 i EPA300.0 m 1L 97 122 1 1 Increase sugested,magnitude uncertain 1 Cyanide 45(=NCE r 45000NCE m L ND 0.042 1 0.005 1 0.005 Biochemical Oxygen Demand(1301)) 5210B 5210B mg1L f 2.9 77` 2 32 Chemical Oxygen Demand COD 5220 5220 m L ND 50 [_20 i 20 The only water quality parameters on the December 200t revision of the Regional Board 13267 list which appear to exhibit a greater than four-fold increase in concentration through the NCPA process are copper and nitrite. It is noted that the NCPA effluent is returned to the headworks of the Lodi WPCF, where it is subjected to considerable dilution, and to constituent attenuation by the WPCF treatment processes, prior to discharge by the City to White Slough. It should also be noted that NCPA's current Wastewater Discharge Permit, (Permit Number 391, issued by the City on 01 March 2046), sets forth a copper effluent limitation of 3.0 mg/L (3,004 ug/L), which is approximately 300 times the concentration of copper measured in the NCPA effluent. Please feel free to contact me at (707) 254-1900 if you have any questions about this report. Sincerely, HydroScience Engineers, Inc.