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 AMMONIA as NITROGEN(mg/L)-Dry/Below Normal Water Year Type percentile statistics Monitoring Monitoring Period min max median Program Site Description start end n n det %det det det mean 10th 25th 50th 75th 90th DWR-MWQI DO-Stockton DO-USGS DO-DWR San Joaquin R.nr. SWAMP Vernalis 10/3/2000 9/9/2004 53 22 42% 0.010 0.630 0.069 0.001 0.005 0.017 0.060 0.191 Mntca-13267 San Joaquin R.@ Mnlca-NPDES WQCF-R1 1/9/2002 9/22/2004 16 12 75% 0.029 0.300 0.137 0.026 0.048 0.095 0.188 0.348 Mntca-NPDES San Joaquin R.@ WQCF-R2 4/27/2004 9/22/2004 4 4 100% 0.036 0.078 0.050 0.027 0.035 0.048 0.065 0.085 DO-Stockton San Joaquin R.@ DO-DWR Mossdale 10/3/2000 10/3/2001 25 18 72% 0.020 0.910 0.302 0.030 0.067 0.165 0.403 0.902 Mntca-NPDES San Joaquin R.@ WQCF-R3 4/27/2004 9/22/2004 4 4 100% 0.011 0.110 0.046 0.006 0.013 0.032 0.079 0.176 Mntca-NPDES San Joaquin R.@ WQCF-R4 4/27/2004 9/22/2004 4 4 100% 0.025 0.109 0.061 0.018 0.031 0.054 0.095 0.158 Stktn-NPDES DO-Stockton San Joaquin R.@ Stktn-13267 RWCF-R1 10/3/2000 9/28/2004 65 31 48% 0.100 0.800 0.259 0.106 0.150 0.221 0.325 0.460 DO-DWR San Joaquin R.@ DO-Stockton Turning Basin 10/3/2000 10/3/2001 28 23 82% 0.020 0.910 0.296 0.042 0.085 0.186 0.404 0.813 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R4 10/17/2000 9/28/2004 52 34 65% 0.220 4.500 0.948 0.143 0.274 0.566 1.169 2.246 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R6 10/3/2000 9/28/2004 40 15 38%* 0.120 2.400 0.386 0.102 0.165 0.281 0.478 0.773 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R8 10/3/2000 9/28/2004 38 11 29%* 0.100 1.000 0.206 0.077 0.112 0.170 0.257 0.373 DWR-MWQI Contra Costa Pumping Plant#1 11/5/2000 9/8/2004 21 16 76% 0.010 0.080 0.024 0.005 0.008 0.017 0.033 0.060 DWR-MWQI Old River near Byron no data available DWR-MWQI Delta Pumping Plant Headworks 10/18/2000 9/15/2004 22 22 100% 0.030 0.140 0.065 0.030 0.041 0.058 0.082 0.011 DMC Intake @ DWR-MWQI Lindemann Rd. no data available (A).No detected data. (B).Less than 20%detected data.General summary statistics provided only. (C).Insufficient unique detected data points.General summary statistics provided only. Estimates of distribution parameters become less accurate as the percent detected data decreases,and may be unacceptable below a 40%detection threshold. DRAFT 41 4/20/2007 Appendix X.Summary Statistics for Existing Water Quality of Selected Receiving Waters in Project Area AMMONIA as NITROGEN(mg/L)-Wet/Above Normal Water Year Type percentile statistics Monitoring Monitoring Period min max median Program Site Description start end n n det %det det det mean 10th 25th 50th 75th 90th DWR-MWQI DO-Stockton DO-USGS San Joaquin R.nr. SWAMP Vernalis 7/18/1996 9/7/2005 97 70 72% 0.010 1.400 0.127 0.006 0.016 0.045 0.127 0.320 Mntca-NPDES San Joaquin R.@ WQCF-R1 10/6/2004 6/21/2006 44 44 100% 0.010 0.450 0.098 0.033 0.050 0.079 0.125 0.188 Mntca-NPDES San Joaquin R.@ WQCF-R2 10/6/2004 6/21/2006 44 44 100% 0.020 0.330 0.097 0.388 0.056 0.083 0.124 0.177 DWR-D-1485 DWR-MWQI DO-Stockton San Joaquin R.@ DO-DWR Mossdale 10/1/1992 9/28/2000 60 42 70% 0.008 0.950 0.100 0.004 0.011 0.032 0.096 0.256 Mntca-NPDES San Joaquin R.@ WQCF-R3 10/6/2004 6/21/2006 44 44 100% 0.010 0.246 0.088 0.030 0.046 0.073 0.115 0.173 Mntca-NPDES San Joaquin R.@ WQCF-R4 10/6/2004 6/21/2006 44 44 100% 0.010 0.251 0.087 0.025 0.041 0.068 0.114 0.181 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R1 6/27/2000 9/27/2005 64 14 22% 0.200 0.500 C DO-Stockton San Joaquin R.@ DO-DWR Turning Basin 6/20/2000 9/28/2000 19 7 37%* 0.040 0.240 0.119 0.054 0.074 0.106 0.152 0.210 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R4 6/20/2000 9/27/2005 64 14 22%* 0.600 2.600 0.433 0.043 0.092 0.216 0.507 1.093 Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R6 6/20/2000 9/27/2005 48 3 6% 0.500 1.000 B Stktn-NPDES San Joaquin R.@ DO-Stockton RWCF-R8 6/27/2000 9/27/2005 44 0 0% A DWR-MWQI Contra Costa Pumping Plant#1 6/6/1996 6/5/2006 42 31 74% 0.010 0.200 0.034 0.005 0.010 0.021 0.043 0.082 DWR-MWQI Old River near Byron 6/12/1996 8/4/1998 21 21 100% 0.008 0.140 0.047 0.014 0.022 0.037 0.063 0.100 DWR-MWQI Delta Pumping Plant Headworks 6/13/1996 5/17/2006 67 67 100% 0.008 0.183 0.065 0.026 0.037 0.055 0.082 0.117 DMC Intake @ DWR-MWQI Lindemann Rd. 6/13/1996 9/2/1997 16 16 100% 0.017 0.167 0.065 0.023 0.035 0.055 0.087 0.131 (A).No detected data. (B).Less than 20%detected data.General summary statistics provided only. (C).Insufficient unique detected data points.General summary statistics provided only. `Estimates of distribution parameters become less accurate as the percent detected data decreases,and may be unacceptable below a 40%detection threshold. DRAFT 42 4/20/2007