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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 /> City of Lathrop - MWR-23 <br /> Groundwater Elevation <br /> 000 20 <br /> 0 <br /> o z 15 <br /> ai a>i 10 <br /> W � <br /> (U <br /> o c <br /> 5 <br /> 3 � <br /> v <br /> � E 0 <br /> c7o c <br /> .0 <br /> m -5 <br /> +� <br /> 41 u'f lD r` W Ql O N M u'1 lD I� 00 Ql O c-I N M � un lD I� 00 Ql O c-I N M � u'f <br /> co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co <br /> Date <br /> MWR-23 MWR-23 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 17.31 19.70 MP 17.31 19.70 <br /> Groundwater Groundwater Groundwater <br /> Groundwater Elevation <br /> Date Sampled DTW(ft) Elevation Elevation Date Sampled DTW(ft) Elevation <br /> ft,NGVD 29 ft,NAVD 88 ft,NGVD 29 (ft,NAVD 88) <br /> 8/31/2005 14.07 3.24 5.63 7/24/2012 15.14 2.17 4.56 <br /> 11/28/2005 15.65 1.66 4.05 10/9/2012 15.29 2.02 4.41 <br /> 2/7/2006 14.30 3.01 5.40 1/28/2013 14.75 2.56 4.95 <br /> 4/25/2006 7.40 9.91 12.3 4/26/2013 14.48 2.83 5.22 <br /> 7/19/2006 14.30 3.01 5.40 7/20/2013 14.38 2.93 5.32 <br /> 10/13/2006 14.60 2.71 5.10 11/18/2013 15.15 2.16 4.55 <br /> 1/23/2007 15.50 1.81 4.20 1/28/2014 14.60 2.71 5.10 <br /> 4/24/2007 15.30 2.01 4.40 4/22/2014 14.50 2.81 5.20 <br /> 7/24/2007 14.90 2.41 4.80 7/31/2014 14.20 3.11 5.50 <br /> 10/30/2007 14.90 2.41 4.80 11/4/2014 14.90 2.41 4.80 <br /> 1/24/2008 15.20 2.11 4.50 1/30/2015 14.50 2.81 5.20 <br /> 4/15/2008 14.90 2.41 4.80 10/1/2015 15.73 1.58 3.97 <br /> 8/21/2008 15.90 1.41 3.80 10/27/2015 15.80 1.51 3.90 <br /> 10/8/2008 16.00 1.31 3.70 4/25/2016 14.50 2.81 5.20 <br /> 2/9/2009 14.80 2.51 4.90 11/4/2016 14.80 2.51 4.90 <br /> 4/12/2009 15.40 1.91 4.30 12/6/2016 14.73 2.58 4.97 <br /> 8/4/2009 14.80 2.51 4.90 5/8/2017 9.70 7.61 10.00 <br /> 10/1/2009 14.50 2.81 5.20 11/30/2017 15.34 1.97 4.36 <br /> 2/9/2010 14.60 2.71 5.10 5/4/2018 14.40 2.91 5.30 <br /> 4/11/2010 14.60 2.71 5.10 11/7/2018 14.66 2.65 5.04 <br /> 8/27/2010 14.50 2.81 5.20 5/3/2019 13.80 3.51 5.90 <br /> 10/3/2010 14.60 2.71 5.10 10/29/2019 14.00 3.31 5.70 <br /> 1/18/2011 14.30 3.01 5.40 4/16/2020 14.90 2.41 4.80 <br /> 4/10/2011 11.10 6.21 8.60 11/3/2020 14.72 2.59 4.98 <br /> 8/15/2011 13.20 4.11 6.50 5/5/2021 15.15 2.16 4.55 <br /> 10/10/2011 13.30 4.01 6.40 10/20/2021 14.63 2.68 5.07 <br /> 1/26/2012 14.90 2.41 4.80 5/10/2022 14.91 2.40 4.79 <br /> 4/4/2012 14.40 2.91 5.30 11/7/2022 14.60 2.71 5.10 <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 Carlson, Barbee, &Gibson,October 2005. <br /> (b)Surveyed elevations referenced to NAVD 88 and converted to NGVD 29 by subtracting 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 122 of 145 EKI 1390088.03 <br />