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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-9 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> c Q <br /> o z 15 <br /> a, v <br /> "' 10 <br /> L <br /> 3 � <br /> c <br /> E 5 <br /> 3 <br /> o AAA <br /> (D <br /> M 0 <br /> 41 Ln lD r\ W M O r-1 N M � Ln L,D I*, W M O .-I N M � Ln lD r� W M O r-I N M Ln <br /> Ql Ol Ol Ol Ol O O O O O O O O O O <br /> (lS clS [6 (6 [6 [6 (6 (l5 clS [6 [6 [6 [6 (6 (l5 [lS [6 [6 (6 [6 (6 (6 [lS [6 [6 (6 (0 (6 (6 [l5 c6 <br /> Date <br /> MWR-9 MWR-9 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 12.18 14.57 MP 12.18 14.57 <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 /> 1/25/1999 10.98 1.20 3.59 4/10/2011 9.1 3.1 5.5 <br /> 3/2/1999 9.09 3.09 5.48 8/15/2011 8.2 4.0 6.4 <br /> 4/13/1999 10.48 1.70 4.09 10/10/2011 9.2 3.0 5.4 <br /> 3/15/2004 11.43 0.75 3.14 1/26/2012 -- -- -- <br /> 11/15/2004 10.72 1.46 3.85 4/4/2012 10.5 1.7 4.1 <br /> 8/31/2005 8.96 3.22 5.61 7/24/2012 -- -- -- <br /> 11/30/2005 11.61 0.57 2.96 10/9/2012 11.01 1.17 3.56 <br /> 2/9/2006 10.39 1.79 4.18 1/29/2013 -- -- -- <br /> 4/25/2006 8.6 3.6 6.0 4/2/2013 10.3 1.9 4.3 <br /> 7/19/2006 8.4 3.8 6.2 7/20/2013 -- -- -- <br /> 10/13/2006 10.8 1.4 3.8 11/18/2013 11.7 0.5 2.9 <br /> 1/23/2007 11.1 1.1 3.5 1/28/2014 9.6 2.6 5.0 <br /> 4/24/2007 10.7 1.5 3.9 4/22/2014 10.5 1.7 4.1 <br /> 7/24/2007 9.6 2.6 5.0 7/31/2014 9.0 3.2 5.6 <br /> 10/30/2007 11.0 1.2 3.6 11/4/2014 11.1 1.1 3.5 <br /> 1/24/2008 11.0 1.2 3.6 1/29/2015 10.4 1.8 4.2 <br /> 4/15/2008 10.4 1.8 4.2 10/8/2015 11.30 0.88 3.27 <br /> 8/21/2008 9.0 3.2 5.6 10/27/2015 11.4 0.8 3.2 <br /> 10/9/2008 10.6 1.6 4.0 4/25/2016 10.9 1.3 3.7 <br /> 2/9/2009 11.0 1.2 3.6 11/4/2016 9.9 2.3 4.7 <br /> 4/12/2009 10.9 1.3 3.7 12/6/2016 10.76 1.42 3.81 <br /> 8/4/2009 7.9 4.3 6.7 5/8/2017 7.2 5.0 7.4 <br /> 10/1/2009 10.7 1.5 3.9 11/30/2017 11.62 0.56 2.95 <br /> 2/9/2010 10.5 1.7 4.1 5/4/2018 11.2 1.0 3.4 <br /> 4/11/2010 10.1 2.1 4.5 11/8/2018 11.77 0.41 2.80 <br /> 8/27/2010 9.7 2.5 4.9 5/3/2019 9.77 2.41 4.80 <br /> 10/3/2010 11.3 0.9 3.3 10/29/2019 12.45 -0.27 2.12 <br /> 1/18/2011 10.2 2.0 4.4 4/16/2020 11.90 0.28 2.67 <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 in April/May 2004. <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) MWR-9 was damaged during construction.The developer is currently formulating plans for proper abandonment. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 114 of 145 EKI B90088.03 <br />