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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-20 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai ai 10 <br /> W � <br /> S <br /> o c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 0 <br /> -5 <br /> G/ Lf1 lD r� 00 Ql O c-I N M � L(1 l4 r� 00 Ol O r-I N M L!1 l0 r� 00 Ol O r-I N M � lf1 <br /> GJ 01 01 01 T T O O O O O O O O O O 1- 1- 1- 1- 1- 1- 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-20 MWM-20 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 8.38 10.77 MID 8.38 10.77 <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 /> 5/25/2005 5.30 3.08 5.47 5/1/2012 7.05 1.33 3.72 <br /> 6/28/2005 6.29 2.09 4.48 7/26/2012 7.31 1.07 3.46 <br /> 10/12/2005 8.74 -0.36 2.03 10/24/2012 5.56 2.82 5.21 <br /> 1/31/2006 6.36 2.02 4.41 1/30/2013 5.91 2.47 4.86 <br /> 4/25/2006 4.86 3.52 5.91 4/29/2013 5.41 2.97 5.36 <br /> 7/19/2006 5.95 2.43 4.82 7/31/2013 7.82 0.56 2.95 <br /> 10/13/2006 6.18 2.20 4.59 11/20/2013 7.36 1.02 3.41 <br /> 1/23/2007 7.90 0.48 2.87 2/3/2014 7.44 0.94 3.33 <br /> 4/24/2007 7.77 0.61 3.00 4/23/2014 7.14 1.24 3.63 <br /> 7/24/2007 7.24 1.14 3.53 8/4/2014 6.12 2.26 4.65 <br /> 10/30/2007 6.82 1.56 3.95 10/29/2014 7.60 0.78 3.17 <br /> 1/24/2008 5.54 2.84 5.23 1/28/2015 6.07 2.31 4.70 <br /> 4/15/2008 7.60 0.78 3.17 10/22/2015 8.04 0.34 2.73 <br /> 8/18/2008 7.91 0.47 2.86 10/27/2015 8.06 0.32 2.71 <br /> 11/20/2008 5.65 2.73 5.12 4/22/2016 6.84 1.54 3.93 <br /> 2/11/2009 6.65 1.73 4.12 11/1/2016 7.25 1.13 3.52 <br /> 4/14/2009 6.96 1.42 3.81 12/9/2016 7.25 1.13 3.52 <br /> 7/30/2009 7.67 0.71 3.10 5/4/2017 4.27 4.11 6.50 <br /> 10/20/2009 7.50 0.88 3.27 11/27/2017 6.99 1.39 3.78 <br /> 1/26/2010 6.13 2.25 4.64 5/4/2018 7.00 1.38 3.77 <br /> 5/4/2010 7.04 1.34 3.73 11/6/2018 8.27 0.11 2.50 <br /> 8/25/2010 7.74 0.64 3.03 4/29/2019 6.31 2.07 4.46 <br /> 10/26/2010 5.43 2.95 5.34 10/30/2019 7.38 1.00 3.39 <br /> 1/26/2011 5.55 2.83 5.22 5/6/2020 4.65 3.73 6.12 <br /> 4/21/2011 5.55 2.83 5.22 11/5/2020 8.17 0.21 2.60 <br /> 8/17/2011 5.94 2.44 4.83 5/3/2021 8.60 -0.22 2.17 <br /> 10/26/2011 5.66 2.72 5.11 10/18/2021 8.52 -0.14 2.25 <br /> 1/24/2012 6.90 1.48 3.87 4/29/2022 7.70 0.68 3.07 <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 49 of 145 EKI B90088.03 <br />