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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-29 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> = a 15 <br /> o z <br /> 10 <br /> 2 <br /> 5 <br /> 0 <br /> c E <br /> 3 o d -5 <br /> c7 0 <br /> ++ <br /> -10 <br /> W Ln �.o r, oo rn o N m v Ln �o r, oo rn o N m :t Ln 110 r, oo rn o m � Ln <br /> d <br /> ca co co co co ca ca ca ca co co co co ca ca ca ca co co co co co co co co co co co co co co <br /> Date <br /> MWR-29 MWR-29 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MID 10.90 13.29 MP 10.90 13.29 <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 11.08 -0.18 2.21 7/24/2012 10.89 0.01 2.40 <br /> 11/29/2005 12.60 -1.70 0.69 10/9/2012 11.56 -0.66 1.73 <br /> 2/8/2006 11.18 -0.28 2.11 1/29/2013 11.49 -0.59 1.80 <br /> 4/25/2006 11.7 -0.8 1.6 4/2/2013 11.5 -0.6 1.8 <br /> 7/19/2006 11.5 -0.6 1.8 7/20/2013 9.2 1.7 4.1 <br /> 10/13/2006 11.4 -0.5 1.9 11/18/2013 11.8 -0.9 1.5 <br /> 1/23/2007 11.5 -0.6 1.8 1/28/2014 11.2 -0.3 2.1 <br /> 4/24/2007 10.8 0.1 2.5 4/22/2014 10.8 0.1 2.5 <br /> 7/24/2007 9.4 1.5 3.9 7/31/2014 9.7 1.2 3.6 <br /> 10/30/2007 11.5 -0.6 1.8 11/4/2014 11.6 -0.7 1.7 <br /> 1/24/2008 10.5 0.4 2.8 1/29/2015 11.4 -0.5 1.9 <br /> 4/15/2008 10.8 0.1 2.5 10/8/2015 11.73 -0.83 1.56 <br /> 8/21/2008 10.5 0.4 2.8 10/27/2015 12.1 -1.2 1.2 <br /> 10/8/2008 11.6 -0.7 1.7 4/25/2016 11.0 -0.1 2.3 <br /> 2/9/2009 -- -- -- 11/4/2016 11.4 -0.5 1.9 <br /> 4/12/2009 -- -- -- 12/6/2016 11.82 -0.92 1.47 <br /> 8/4/2009 -- -- -- 5/8/2017 10.2 0.7 3.1 <br /> 10/13/2009 11.7 -0.8 1.6 11/30/2017 11.24 -0.34 2.05 <br /> 2/9/2010 11.2 -0.3 2.1 5/4/2018 11.5 -0.6 1.8 <br /> 4/11/2010 11.4 -0.5 1.9 11/8/2018 11.81 -0.91 1.48 <br /> 8/27/2010 10.5 0.4 2.8 5/3/2019 10.09 0.81 3.20 <br /> 10/3/2010 10.9 0.0 2.4 10/29/2019 10.31 0.59 2.98 <br /> 1/18/2011 11.2 -0.3 2.1 4/16/2020 10.80 0.10 2.49 <br /> 4/10/2011 8.1 2.8 5.2 11/3/2020 11.3 -0.42 1.97 <br /> 8/15/2011 11.0 -0.1 2.3 5/5/2021 10.97 -0.07 2.32 <br /> 10/10/2011 11.2 -0.3 2.1 10/20/2021 12.8 -1.92 0.47 <br /> 1/26/2012 12.2 -1.3 1.1 5/10/2022 13.80 -2.90 -0.51 <br /> 4/4/2012 11.6 -0.7 1.7 11/7/2022 22.41 -11.51 -9.12 <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-29. <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 133 of 145 EKI 1390088.03 <br />