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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 /> M W-5 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 10.56 12.95 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 10/23/2006 10.89 -0.33 2.06 <br /> 1/30/2007 10.30 0.26 2.65 <br /> 4/30/2007 10.68 -0.12 2.27 <br /> 8/2/2007 11.00 -0.44 1.95 <br /> 12/3/2007 10.36 0.20 2.59 <br /> 2/18/2008 8.98 1.58 3.97 <br /> 4/16/2008 9.44 1.12 3.51 <br /> 7/15/2008 9.25 1.31 3.70 <br /> 10/20/2008 8.82 1.74 4.13 <br /> 1/12/2009 8.88 1.68 4.07 <br /> 4/20/2009 8.30 2.26 4.65 <br /> 7/27/2009 8.70 1.86 4.25 <br /> 10/26/2009 9.21 1.35 3.74 <br /> 2/5/2010 8.02 2.54 4.93 <br /> 5/3/2010 8.17 2.39 4.78 <br /> 8/3/2010 8.30 2.26 4.65 <br /> 10/14/2010 11.90 -1.34 1.05 <br /> 3/3/2011 7.35 3.21 5.60 <br /> 4/20/2011 7.62 2.94 5.33 <br /> 8/22/2011 8.16 2.40 4.79 <br /> 10/31/2011 8.86 1.70 4.09 <br /> 1/23/2012 7.73 2.83 5.22 <br /> 4/26/2012 7.90 2.66 5.05 <br /> 8/1/2012 9.79 0.77 3.16 <br /> 10/29/2012 10.07 0.49 2.88 <br /> 2/4/2013 9.28 1.28 3.67 <br /> 5/6/2013 10.28 0.28 2.67 <br /> 8/5/2013 10.35 0.21 2.60 <br /> 11/19/2013 10.26 0.30 2.69 <br /> 2/6/2014 10.35 0.21 2.60 <br /> 4/28/2014 10.66 -0.10 2.29 <br /> 8/6/2014 10.77 -0.21 2.18 <br /> 11/4/2014 10.61 -0.05 2.34 <br /> 2/2/2015 9.75 0.81 3.20 <br /> 4/27/2015 10.05 0.51 2.90 <br /> 7/27/2015 10.33 0.23 2.62 <br /> 8/31/2015 9.90 0.66 3.05 <br /> 10/29/2015 10.29 0.27 2.66 <br /> 2/4/2016 8.55 2.01 4.40 <br /> 4/21/2016 9.25 1.31 3.70 <br /> 8/8/2016 10.20 0.36 2.75 <br /> 12/7/2016 10.21 0.35 2.74 <br /> 11/28/2017 9.06 1.50 3.89 <br /> 11/5/2018 9.64 0.92 3.31 <br /> 10/31/2019 9.30 1.26 3.65 <br /> 11/4/2020 9.57 0.99 3.38 <br /> 10/19/2021 10.10 0.46 2.85 <br /> 11/8/2022 9.54 1.02 3.41 <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 92 of 145 EKI B90088.03 <br />