ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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Appendix X.Summary Statistics for Existing Water Quality of Selected Receiving Waters in Project Area ELECTRICAL CONDUCTIVITY(pmhoslcm)-Wet/Above Normal Water Year Type percentile statistics Monitoring Monitoring Period min max median Program Site Description start end n n del %del del det mean 10th 25th (50th) 75th 90th SWAMP DWR-MWQI San Joaquin R.nr. DO-Stockton Vernalis 10/6/1992 9/7/2005 492 492 100% 4.08 1450 495.2 220.0 304.2 435.8 624.4 863.4 Mntca-NPDES San Joaquin R.@ WQCF-R1 10/6/2004 4/26/2006 53 53 100% 113 911 442.9 162.2 240.5 372.3 576.3 854.3 Mntca-NPDES San Joaquin R.@ WQCF-R2 10/6/2004 6/21/2006 44 44 100% 113 910 456.3 165.0 246.2 383.7 598.2 892.6 DWR-MWQI DWR-D-1485 San Joaquin R.@ DO-Stockton Mossdale 10/7/1992 9/26/2000 79 79 100% 134 1310 528.1 236.2 326.6 467.9 670.5 927.1 Mmca-NPDES San Joaquin R.@ WQCF-R3 11/22/2005 5/9/2006 5 5 100% 122 824 371.6 98.6 168.9 307.1 558.3 956.7 Mntca-NPDES San Joaquin R.@ WQCF-R4 no data available Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R1 6/20/2000 10/18/2005 56 56 100% 130 930 503.0 248.9 332.3 458.0 631.2 842.8 DO-Stockton San Joaquin R.@ Tuming Basin' 6/20/2000 9/26/2000 13 13 100% 438 732 564.9 446.0 496.3 558.8 629.2 700.2 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R4 6/20/2000 10/18/2005 51 51 100% 127 940 509.2 257.6 341.3 466.3 637.0 843.9 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R6 6/20/2000 10/18/2005 51 51 100% 139 789 506.3 269.3 349.9 468.0 625.9 813.3 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R8 6/20/2000 10/18/2005 51 51 100% 130 748 339.5 190.0 242.2 317.1 415.1 529.1 DWR-MWQI Contra Costa Pum in Plant#1 10/7/1992 6/5/2006 99 99 100% 146 1390 470.1 179.7 260.3 392.8 592.8 858.9 DWR-MWQI Old River near ,"on' 10/7/1992 9/6/2000 73 73 100% 133 908 334.8 174.8 227.6 305.1 409.0 532.7 DWR-MWQI Delta Pumping Plant Headworks 10/7/1992 5/17/2006 106 106 100% 139 767 364.1 197.2 253.8 336.0 444.7 572.4 DM Intake DWR-MWQI Lindemann Rd. 10/7/1992 5/26/1999 63 63 100% 152 1070 416.4 212.6 279.8 379.6 515.0 677.9 *Reported as Specific Conductance DRAFT 3 4/20/2007 Appendix X.Summary Statistics for Existing Water Quality of Selected Receiving Waters in Project Area TOTAL DISSOLVED SOLIDS(mg/L)-Critical Water Year Type percentile statistics Monitoring Monitoring Period min max median Program Site Description start end n n det %del det del mean 10th 25th 50th 75th 90th DWR-MWQI San Joaquin R.nr. Vernalis 10/2/1989 9/22/1994 52 52 100% 117 803 521.8 342.0 409.5 500.2 610.9 731.6 Mntca-NPDES San Joaquin R.@ WQCF-R1 no data available Mntca-NPDES San Joaquin R.@ WQCF-R2 no data available DWR-D-1485 San Joaquin R.@ DWR-MWQI Mossdale 10/4/1989 9/9/1994 67 67 100% 144 809 533.1 365.2 430.1 515.7 618.2 728.0 Mntca-NPDES San Joaquin R.@ WQCF-R3 no data available Mntca-NPDES San Joaquin R.@ WQCF-R4 no data available Stktn-NPDES San Joaquin R.@ RWCF-Ri no data available DO-Stockton San Joaquin R.@ Tumin Basin no data available Stktn-NPDES San Joaquin R.@ RWCF-R4 no data available Stktn-NPDES San Joaquin R.@ RWCF-R6 no data available Stktn-NPDES San Joaquin R.@ RWCF-R8 no data available DWR-MWQI Contra Costa Pumpin Plant#1 5/21/1991 9/20/1994 29 29 100% 202 529 338.8 210.0 257.6 323.0 405.1 496.8 DWR-MWQI Old River near B ron 1/24/1990 7/20/1994 19 19 100% 207 425 310.3 209.7 248.8 300.7 363.4 431.1 DWR-MWQI Delta Pumping Plant Headworks 1/24/1990 9/22/1994 49 49 100% 183 475 305.2 215.6 251.0 297.0 351.6 409.3 DWR-MWQI DMC Intake @ Lindemann Rd. 1/24/1990 9/22/1994 48 48 100% 147 548 327.3 199.7 246.2 310.6 391.9 483.3 DRAFT 4 4/20/2007