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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-19 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai > 10 <br /> W � <br /> 1 <br /> "' 141 <br /> o c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 M <br /> m -5 <br /> 41 <br /> G/ Ln to r, oo Ql O -i N rn Ln to r, oo Ol O r-I N M Ln to r, oo cn O r-I N M � Ln <br /> N 01 Ol Ol T T 0 0 0 0 0 0 0 0 0 0 r- r- r- r- r- r- 1- 1- 1- 1- 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 /> MWM-19 MWM-19 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 11.66 14.05 MP 11.66 14.05 <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 /> 5/26/2005 9.05 2.61 5.00 5/3/2012 8.40 3.26 5.65 <br /> 6/28/2005 7.39 4.27 6.66 7/27/2012 9.59 2.07 4.46 <br /> 10/12/2005 7.61 4.05 6.44 10/25/2012 9.95 1.71 4.10 <br /> 1/31/2006 8.07 3.59 5.98 2/1/2013 8.41 3.25 5.64 <br /> 4/25/2006 6.42 5.24 7.63 5/1/2013 8.75 2.91 5.30 <br /> 7/19/2006 9.07 2.59 4.98 8/2/2013 9.21 2.45 4.84 <br /> 10/13/2006 11.23 0.43 2.82 11/21/2013 9.71 1.95 4.34 <br /> 1/23/2007 10.80 0.86 3.25 2/5/2014 9.78 1.88 4.27 <br /> 4/24/2007 10.18 1.48 3.87 4/24/2014 9.41 2.25 4.64 <br /> 7/24/2007 10.63 1.03 3.42 8/7/2014 10.16 1.50 3.89 <br /> 10/30/2007 11.03 0.63 3.02 11/3/2014 10.45 1.21 3.60 <br /> 1/24/2008 10.09 1.57 3.96 1/29/2015 9.05 2.61 5.00 <br /> 4/15/2008 9.15 2.51 4.90 10/22/2015 10.68 0.98 3.37 <br /> 8/19/2008 9.93 1.73 4.12 10/27/2015 10.70 0.96 3.35 <br /> 11/20/2008 10.14 1.52 3.91 4/22/2016 9.80 1.86 4.25 <br /> 2/11/2009 9.68 1.98 4.37 11/1/2016 9.62 2.04 4.43 <br /> 4/13/2009 9.22 2.44 4.83 12/9/2016 10.20 1.46 3.85 <br /> 7/30/2009 10.07 1.59 3.98 5/5/2017 7.03 4.63 7.02 <br /> 10/21/2009 10.39 1.27 3.66 9/14/2017 9.36 2.30 4.69 <br /> 1/26/2010 9.71 1.95 4.34 11/27/2017 9.25 2.41 4.80 <br /> 5/6/2010 8.86 2.80 5.19 2/28/2018 9.25 2.41 4.80 <br /> 8/24/2010 9.40 2.26 4.65 5/4/2018 8.75 2.91 5.30 <br /> 10/28/2010 9.59 2.07 4.46 11/6/2018 10.06 1.60 3.99 <br /> 1/27/2011 8.25 3.41 5.80 4/30/2019 8.28 3.38 5.77 <br /> 4/26/2011 7.58 4.08 6.47 10/30/2019 9.42 2.24 4.63 <br /> 8/17/2011 8.62 3.04 5.43 5/11/2020 9.09 2.57 4.96 <br /> 10/26/2011 8.85 2.81 5.20 11/5/2020 10.05 1.61 4.00 <br /> 1/25/2012 7.20 4.46 6.85 5/5/2021 9.90 1.76 4.15 <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 MacKay&Somps,July 2005. <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 47 of 145 EKI B90088.03 <br />