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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 - MWM-2 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> ai 10 <br /> W � <br /> 4J <br /> S <br /> o c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 M <br /> m -5 <br /> 41 <br /> G/ Ln 1.0 n 00 Ql O ri N M � Ln l0 n 00 0) O r-I N M � Ln 1.0 n 00 M O r-I N M � Ln <br /> OJ 01 01 01 T T 0 0 0 0 0 0 0 0 0 0 r- r- r- r- r- 1- r- r- r- r- N N N N N N <br /> co co co co co c0 c0 c0 c0 c0 c0 c0 (0 (0 (0 (0 (0 (0 (0 (6 c0 c6 c6 c6 c6 c6 c0 ca ca ra ra <br /> Date <br /> MWM-2 MWM-2 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 1 12.92 15.31 MP 1 12.92 15.31 <br /> MP 2 11.18 13.57 MP 2 11.18 13.57 <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 /> 5/19/2005 10.13 2.79 5.18 10/27/2011 7.76 3.42 5.81 <br /> 6/28/2005 9.83 3.09 5.48 1/25/2012 8.60 2.58 4.97 <br /> 10/12/2005 11.05 1.87 4.26 5/3/2012 8.10 3.08 5.47 <br /> 1/31/2006 8.72 4.20 6.59 7/30/2012 9.29 1.89 4.28 <br /> 4/25/2006 3.83 9.09 11.48 10/25/2012 9.25 1.93 4.32 <br /> 7/19/2006 16.94 -4.02 -1.63 1/31/2013 9.31 1.87 4.26 <br /> 10/13/2006 10.77 2.15 4.54 5/2/2013 9.01 2.17 4.56 <br /> 1/23/2007 9.32 1.86 4.25 8/2/2013 9.64 1.54 3.93 <br /> 4/24/2007 8.85 2.33 4.72 11/21/2013 9.22 1.96 4.35 <br /> 7/24/2007 9.77 1.41 3.80 2/5/2014 9.98 1.20 3.59 <br /> 10/30/2007 8.85 2.33 4.72 4/24/2014 9.89 1.29 3.68 <br /> 1/24/2008 8.75 2.43 4.82 8/5/2014 9.67 1.51 3.90 <br /> 4/15/2008 9.00 2.18 4.57 10/30/2014 9.54 1.64 4.03 <br /> 8/22/2008 9.15 2.03 4.42 1/28/2015 9.90 1.28 3.67 <br /> 11/24/2008 9.39 1.79 4.18 10/22/2015 9.38 1.80 4.19 <br /> 2/17/2009 8.42 2.76 5.15 10/27/2015 9.31 1.87 4.26 <br /> 4/15/2009 8.93 2.25 4.64 4/22/2016 8.55 2.63 5.02 <br /> 7/29/2009 8.93 2.25 4.64 11/1/2016 9.22 1.96 4.35 <br /> 10/22/2009 8.57 2.61 5.00 12/9/2016 10.26 0.92 3.31 <br /> 2/1/2010 8.17 3.01 5.40 5/4/2017 3.80 7.38 9.77 <br /> 4/22/2010 7.33 3.85 6.24 11/27/2017 8.98 2.20 4.59 <br /> 8/26/2010 9.18 2.00 4.39 5/4/2018 8.25 2.93 5.32 <br /> 10/20/2010 9.07 2.11 4.50 11/7/2018 9.20 1.98 4.37 <br /> 1/25/2011 6.02 5.16 7.55 4/29/2019 6.51 4.67 7.06 <br /> 4/21/2011 3.45 7.73 10.12 11/1/2019 9.07 2.11 4.50 <br /> 8/18/2011 7.51 3.67 6.06 5/6/2020 9.45 1.73 4.12 <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 1 elevation surveyed by MacKay&Somps,July 2005. MP 2 elevation surveyed by MacKay&Somps,January 2007 following <br /> modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured before <br /> January 2007 are calculated using MP 1 and after January 2007 are calculated using MP 2. <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 20 of 145 EKI B90088.03 <br />