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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-25 <br /> Groundwater Elevation <br /> 000 20 <br /> 0 <br /> o z 15 <br /> ai a>i 10 <br /> W � <br /> (U <br /> 0 o 5 0 W- <br /> 3 � <br /> v <br /> � E 0 <br /> o c <br /> c7 <br /> +� <br /> -5 <br /> 41 u'f lD r` W Ql O N M u'1 lD I� 00 Ql O c-I N M � un lD I� 00 Ql O c-I N M � u'f <br /> co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co <br /> Date <br /> MWR-25 MWR-25 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 13.86 16.25 MP 13.86 16.25 <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 /> 8/31/2005 10.68 3.18 5.57 7/24/2012 11.1 2.8 5.2 <br /> 11/28/2005 12.65 1.21 3.60 10/9/2012 11.3 2.6 5.0 <br /> 2/7/2006 11.21 2.65 5.04 1/28/2013 11.29 2.57 4.96 <br /> 4/25/2006 4.2 9.7 12.1 4/2/2013 11.4 2.5 4.9 <br /> 7/19/2006 11.5 2.4 4.8 7/20/2013 10.9 3.0 5.4 <br /> 10/13/2006 10.0 3.9 6.3 11/18/2013 11.9 2.0 4.4 <br /> 1/23/2007 12.1 1.8 4.2 1/28/2014 11.4 2.5 4.9 <br /> 4/24/2007 11.9 2.0 4.4 4/22/2014 11.5 2.4 4.8 <br /> 7/24/2007 11.5 2.4 4.8 7/31/2014 11.0 2.9 5.3 <br /> 10/30/2007 11.5 2.4 4.8 11/4/2014 11.6 2.3 4.7 <br /> 1/24/2008 11.9 2.0 4.4 1/30/2015 11.2 2.7 5.1 <br /> 4/15/2008 11.6 2.3 4.7 10/1/2015 12.38 1.48 3.87 <br /> 8/21/2008 11.4 2.5 4.9 10/28/2015 12.4 1.5 3.9 <br /> 10/8/2008 11.5 2.4 4.8 4/25/2016 11.0 2.9 5.3 <br /> 2/9/2009 11.4 2.5 4.9 11/4/2016 11.5 2.4 4.8 <br /> 4/12/2009 12.1 1.8 4.2 12/6/2016 11.23 2.63 5.02 <br /> 8/4/2009 11.2 2.7 5.1 5/8/2017 6.4 7.5 9.9 <br /> 10/1/2009 11.4 2.5 4.9 11/30/2017 12.23 1.63 4.02 <br /> 2/9/2010 11.2 2.7 5.1 5/4/2018 11.0 2.9 5.3 <br /> 4/11/2010 11.3 2.6 5.0 11/7/2018 11.40 2.46 4.85 <br /> 8/27/2010 11.8 2.1 4.5 5/3/2019 10.05 3.81 6.20 <br /> 10/3/2010 11.4 2.5 4.9 10/29/2019 10.61 3.25 5.64 <br /> 1/18/2011 11.1 2.8 5.2 4/16/2020 11.70 2.16 4.55 <br /> 4/10/2011 9.4 4.5 6.9 11/3/2020 11.4 2.43 4.82 <br /> 8/15/2011 -- -- -- 5/5/2021 11.88 1.98 4.37 <br /> 10/10/2011 9.7 4.2 6.6 10/20/2021 11.3 2.60 4.99 <br /> 1/26/2012 11.8 2.1 4.5 5/10/2022 11.79 2.07 4.46 <br /> 4/4/2012 11.0 2.9 5.3 11/7/2022 11.23 2.63 5.02 <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 /> EKI Environment &Water, Inc. <br /> July 2023 Page 125 of 145 EKI 1390088.03 <br />