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Far-Field Water Quality Parameters 4.0 <br /> Combining available surface water quality data with the percent contribution of WQCF effluent Deep Water Chip Channel <br /> in the Sacramento-San Joaquin River Delta allows an estimation of the incremental change in 3.5 <br /> water quality in response to the proposed project. The analysis is clearly appropriate for <br /> conservative parameters such as EC. However,due to the lack of a well-defined model for DOC 3.0 <br /> or nitrate transformations,all potential sources and sinks of these two parameters are ignored, <br /> and they are treated as conservative. 0 2.5 <br /> a <br /> Modeline Approach: The percent contribution results from the Delta hydrologic model(RMAE 2.0 <br /> 2006)allow the use of a mass balance model to estimate incremental changes in water quality at 0 <br /> six far-field Delta locations. Calculation of far-field water quality estimates requires the d 1.5 <br /> following multi-step process: a <br /> 1. Use the percent contributions of WQCF effluent for flowrates of 9.87,17.5,and 27 MGD 1.0 <br /> (ADWF)at each site within the Delta to estimate the percent contribution of WQCF �-RM 2006 <br /> effluent at historic flowrates corresponding to the modeled water years. 0'5 Projected Contribution <br /> 2. Determine the WQCF effluent quality corresponding to the modeled water years. 0.0 <br /> 3. Determine the WQCF effluent quality corresponding to the proposed project scenarios. 0 5 10 15 20 25 30 <br /> 4. Determine the observed water quality in the Delta corresponding to the modeled water WQCF ADWF(MGD) <br /> years. <br /> 5. Use the historic WQCF effluent quality and percent contribution to estimate the Delta Figure 34: Projection of Percent Contributions Back to Conditions of Modeled <br /> water quality sans WQCF discharge. Critical Water Year(1991/1992) <br /> 6. Calculate the projected water quality in the Delta for the proposed project scenarios using Table 37: Median Percent Contribution of WQCF Effluent at Select Locations within the Delta for <br /> projected effluent quality and percent contribution in conjunction with the Delta water Critical Water Years(adapted from RMA 2006) <br /> quality sans WQCF discharge. Percent Contribution for WQCF ADWF(%) <br /> The WQCF percent effluent contribution to the water column within the Delta(RMA 2006)is Location 2.1111 MGD 9.87 MGD 17.5 MGD 27 MGD <br /> used to project the WQCF contribution for the historic WQCF flowrates corresponding to the <br /> modeled water years. During the critical water year(1991/1992)the WQCF had a flowrate of SWP Clifton Court Intake 0.0307 0.1252 0.2209 0.3354 <br /> 2.1 MGD(ADWF),and during the dry/below normal water year(2001/2002)the flowrate was CVP DMC Intake 0.0703 0.2878 0.5034 0.7685 <br /> 3.5 MGD(ADWF). Because the percent contribution of WQCF effluent to the selected locations CCWD Intake at Rock Slough 0.0083 0.0352 0.0620 0.0947 <br /> is low,the response in relation to changes in the ADWF is approximately linear. The process for CCWD Intake at Old River 0.0181 0.0725 0.1254 0.1921 <br /> the critical water year projection at the DWSC is presented in Figure 34. By repeating the San Joaquin River at Light 18 0.0523 0.2132 0.3717 0.5681 <br /> process for the other locations in the Delta,the percent contributions of WQCF effluent at the <br /> other selected locations can be calculated for both the critical and dry/below normal water years Stockton Turning Basin 0.3003 1.3676 2.4157 3.7206 <br /> (1991/1992 and 2001/2002,respectively). The percent contributions of WQCF effluent at the (1)For the modeled critical water year(1 9 9111 9 9 2)the WQCF ADWF was 2.1 MGD(ADWF). <br /> selected locations in the Delta for critical and dry/below normal water years are listed in Tables <br /> 37 and 38,respectively. <br /> City of Manteca Antidegradation Analysis 89 June 2007 City of Manteca Antidegradation Analysis 90 June 2007 <br />