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Appendix B- Historical Water Levels City of Lathrop <br /> Consolidated Treatment Facility <br /> Monitoring and Reporting Program R5-2016-0028-03 Rev 3 <br /> W-1 W-1 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 13.36 15.75 MID 13.36 15.75 <br /> Groundwater Groundwater Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 ft,NGVD 29 ft NAVD 88 <br /> Feb-00 12.83 0.53 2.92 1/23/2012 9.39 3.97 6.36 <br /> Mar-00 12.25 1.11 3.50 4/26/2012 9.60 3.76 6.15 <br /> Apr-00 15.60 -2.24 0.15 8/1/2012 11.43 1.93 4.32 <br /> May-00 13.50 -0.14 2.25 10/29/2012 11.38 1.98 4.37 <br /> Jun-00 14.60 -1.24 1.15 2/4/2013 9.98 3.38 5.77 <br /> Jul-00 14.60 -1.24 1.15 5/6/2013 10.80 2.56 4.95 <br /> Sep-00 14.60 -1.24 1.15 8/5/2013 11.87 1.49 3.88 <br /> Oct-00 14.12 -0.76 1.63 11/19/2013 11.78 1.58 3.97 <br /> Nov-00 13.1 0.26 2.65 2/6/2014 11.57 1.79 4.18 <br /> Dec-00 16.58 -3.22 -0.83 4/28/2014 11.45 1.91 4.30 <br /> Jan-01 16.58 -3.22 -0.83 8/6/2014 12.77 0.59 2.98 <br /> Feb-01 13.17 0.19 2.58 11/4/2014 12.10 1.26 3.65 <br /> Mar-01 12.11 1.25 3.64 2/2/2015 10.75 2.61 5.00 <br /> Apr-01 12.67 0.69 3.08 4/27/2015 11.98 1.38 3.77 <br /> 10/11/2002 14.67 -1.31 1.08 7/27/2015 12.82 0.54 2.93 <br /> 1/24/2003 15.00 -1.64 0.75 8/31/2015 13.05 0.31 2.70 <br /> 4/16/2003 13.33 0.03 2.42 10/29/2015 12.21 1.15 3.54 <br /> 9/24/2003 14.85 -1.49 0.90 2/4/2016 10.65 2.71 5.10 <br /> 2/23/2004 13.30 0.06 2.45 4/21/2016 9.25 4.11 6.50 <br /> 4/20/2004 13.76 -0.40 1.99 8/8/2016 11.95 1.41 3.80 <br /> 7/28/2004 16.00 -2.64 -0.25 12/7/2016 11.64 1.72 4.11 <br /> 12/2/2004 16.34 -2.98 -0.59 11/28/2017 10.47 2.89 5.28 <br /> 4/21/2005 14.88 -1.52 0.87 11/5/2018 9.64 3.72 6.11 <br /> 8/18/2005 16.57 -3.21 -0.82 10/31/2019 10.77 2.59 4.98 <br /> 10/12/2005 14.84 -1.48 0.91 11/4/2020 11.25 2.11 4.50 <br /> 1/26/2006 13.07 0.29 2.68 10/19/2021 12.05 1.31 3.70 <br /> 5/1/2006 11.29 2.07 4.46 11/8/2022 11.94 1.42 3.81 <br /> 8/15/2009 12.45 0.91 3.30 <br /> 10/23/2006 11.88 1.48 3.87 <br /> 1/30/2007 10.97 2.39 4.78 <br /> 4/30/2007 11.44 1.92 4.31 <br /> 8/2/2007 12.36 1.00 3.39 <br /> 12/3/2007 11.58 1.78 4.17 <br /> 2/18/2008 10.14 3.22 5.61 <br /> 4/16/2008 11.14 2.22 4.61 <br /> 7/15/2008 11.60 1.76 4.15 <br /> 10/20/2008 11.37 1.99 4.38 <br /> 1/12/2009 10.87 2.49 4.88 <br /> 4/20/2009 10.88 2.48 4.87 <br /> 7/27/2009 11.47 1.89 4.28 <br /> 10/26/2009 10.97 2.39 4.78 <br /> 2/5/2010 9.80 3.56 5.95 <br /> 5/3/2010 9.23 4.13 6.52 <br /> 8/3/2010 10.80 2.56 4.95 <br /> 10/14/2010 10.65 2.71 5.10 <br /> 3/3/2011 8.20 5.16 7.55 <br /> 4/20/2011 8.47 4.89 7.28 <br /> 8/22/2011 9.67 3.69 6.08 <br /> 10/31/2011 9.55 3.81 6.20 <br /> Abbreviations: <br /> DTW=depth to water <br /> ft=feet <br /> MP=measuring point <br /> NAVD 88=North American Vertical Datum of 1988 <br /> NGVD 29= National Geodetic Vertical Datum of 1929 <br /> Notes: <br /> (a) MP elevation surveyed by MacKay&Somps, February 2015. <br /> (b)Surveyed elevations referenced to NGVD 29 and converted to NAVD 88 by adding 2.39 ft. Datum conversion factor determined <br /> from National Geodetic Survey Vertcon website and is an average for the area. (www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html) <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 88 of 145 EKI B9O088.03 <br />