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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-30 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> a 15 <br /> 0 z <br /> a 10 <br /> 5 <br /> 41 <br /> 0 <br /> c E <br /> v <br /> o c -5 <br /> c7 � <br /> -10 <br /> 41 <br /> Gl U) lD r� 00 M O -i N M � U) 1.0 r� 00 Ol O -i N M �t Ln 1.0 r� 00 M O r I N M � Ln <br /> OJ 01 01 01 01 01 O O O O O O O O O O c-I c-I c-I c-I c-I c-I c-I c-I c-I c-I N N N N N N <br /> co co co co co co co co co co co co ro ro ro ro ro ro ro ra ca ca ca ca co co co ca ca ra ra <br /> Date <br /> MWR-30 MWR-30 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 10.83 13.22 MID 10.83 13.22 <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 /> 8/31/2005 10.95 -0.12 2.27 7/24/2012 11.3 -0.5 1.9 <br /> 11/29/2005 11.35 -0.52 1.87 10/9/2012 12.1 -1.3 1.1 <br /> 2/8/2006 10.76 0.07 2.46 1/29/2013 11.0 -0.1 2.3 <br /> 4/25/2006 9.9 0.9 3.3 4/2/2013 10.7 0.1 2.5 <br /> 7/19/2006 8.9 1.9 4.3 7/20/2013 9.3 1.5 3.9 <br /> 10/13/2006 11.0 -0.2 2.2 11/18/2013 11.8 -0.9 1.5 <br /> 1/23/2007 11.1 -0.3 2.1 1/28/2014 11.1 -0.3 2.1 <br /> 4/24/2007 9.7 1.1 3.5 4/22/2014 11.1 -0.3 2.1 <br /> 7/24/2007 9.3 1.5 3.9 7/31/2014 11.2 -0.4 2.0 <br /> 10/30/2007 11.1 -0.3 2.1 11/4/2014 11.4 -0.6 1.8 <br /> 1/24/2008 10.3 0.5 2.9 1/29/2015 10.9 -0.1 2.3 <br /> 4/15/2008 10.3 0.5 2.9 10/1/2015 11.17 -0.34 2.05 <br /> 8/21/2008 10.2 0.6 3.0 10/27/2015 11.7 -0.9 1.5 <br /> 10/8/2008 11.0 -0.2 2.2 4/25/2016 11.0 -0.2 2.2 <br /> 2/9/2009 10.6 0.2 2.6 11/4/2016 11.0 -0.2 2.2 <br /> 4/12/2009 11.8 -1.0 1.4 12/6/2016 11.39 -0.56 1.83 <br /> 8/4/2009 8.0 2.8 5.2 5/8/2017 9.3 1.5 3.9 <br /> 10/1/2009 10.5 0.3 2.7 11/30/2017 11.24 -0.41 1.98 <br /> 2/9/2010 -- -- -- 5/4/2018 11.3 -0.5 1.9 <br /> 4/11/2010 10.9 -0.1 2.3 11/8/2018 12.04 -1.21 1.18 <br /> 8/27/2010 -- -- -- 5/3/2019 10.92 -0.09 2.30 <br /> 10/3/2010 11.2 -0.4 2.0 10/29/2019 10.40 0.43 2.82 <br /> 1/18/2011 10.8 0.0 2.4 4/16/2020 10.90 -0.07 2.32 <br /> 4/10/2011 7.4 3.4 5.8 11/3/2020 11.3 -0.45 1.94 <br /> 8/15/2011 10.8 0.0 2.4 5/5/2021 11.06 -0.23 2.16 <br /> 10/10/2011 10.8 0.0 2.4 10/20/2021 12.5 -1.71 0.68 <br /> 1/26/2012 11.6 -0.8 1.6 5/10/2022 13.63 -2.80 -0.41 <br /> 4/4/2012 11.4 -0.6 1.8 11/7/2022 18.65 -7.82 -5.43 <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 /> (c)Open marker represents questionable water level, likely due to dewatering activities in the vicinity of MWR-30. <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 135 of 145 EKI 1390088.03 <br />