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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-4 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai ai 10 <br /> W � <br /> 5 <br /> o c <br /> 3 � <br /> v <br /> 3 E 0 <br /> o c <br /> 0 <br /> +� <br /> -5 <br /> G/ ul lD I� oo Ql O rl N M u'1 l4 I� oo Ol O rl N m � u1 1.0 I� oo Ol O rl N m � u'1 <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 /> MWR-4 MWR-4 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MID 16.43 18.82 MID 16.43 18.82 <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 /> 1/25/1999 13.84 2.59 4.98 10/3/2010 13.62 2.81 5.2 <br /> 3/2/1999 12.14 4.29 6.68 1/18/2011 13.1 3.3 5.7 <br /> 4/13/1999 13.08 3.35 5.74 4/10/2011 10.6 5.8 8.2 <br /> 3/15/2004 13.85 2.58 4.97 8/15/2011 11.5 4.9 7.3 <br /> 9/27/2004 13.00 3.43 5.82 10/10/2011 12.2 4.2 6.6 <br /> 11/15/2004 14.19 2.24 4.63 1/26/2012 13.6 2.8 5.2 <br /> 2/24/2005 13.22 3.21 5.60 4/4/2012 8.4 8.0 10.4 <br /> 8/31/2005 12.22 4.21 6.60 7/24/2012 -- -- -- <br /> 11/28/2005 14.31 2.12 4.51 10/9/2012 13.9 2.5 4.9 <br /> 2/9/2006 13.33 3.10 5.49 1/29/2013 12.2 4.3 6.7 <br /> 4/25/2006 9.2 7.2 9.6 4/2/2013 12.7 3.8 6.2 <br /> 7/19/2006 12.2 4.2 6.6 7/20/2013 -- -- -- <br /> 10/13/2006 7.3 9.1 11.5 11/18/2013 14.3 2.1 4.49 <br /> 1/23/2007 11.8 4.6 7.0 1/28/2014 14.5 1.9 4.3 <br /> 4/24/2007 14.0 2.4 4.8 4/22/2014 14.3 2.1 4.5 <br /> 7/24/2007 13.8 2.6 5.0 7/31/2014 13.3 3.1 5.5 <br /> 10/30/2007 14.0 2.4 4.8 11/4/2014 13.1 3.3 5.7 <br /> 1/24/2008 14.2 2.2 4.6 1/29/2015 9.7 6.7 9.1 <br /> 4/15/2008 13.8 2.6 5.0 10/8/2015 16.04 0.39 2.78 <br /> 8/21/2008 13.7 2.7 5.1 10/27/2015 14.8 1.6 4.0 <br /> 10/8/2008 13.9 2.5 4.9 4/25/2016 13.3 3.1 5.5 <br /> 2/9/2009 14.2 2.2 4.6 11/4/2016 9.3 7.1 9.5 <br /> 4/12/2009 14.4 2.0 4.4 12/6/2016 10.94 5.49 7.88 <br /> 8/4/2009 13.5 2.9 5.3 5/8/2017 6.7 9.7 12.1 <br /> 10/1/2009 14.0 2.4 4.8 11/30/2017 12.67 3.76 6.15 <br /> 2/9/2010 14.0 2.4 4.8 5/4/2018 11.5 4.9 7.3 <br /> 4/11/2010 14.1 2.3 4.7 11/7/2018 12.24 4.19 6.58 <br /> 8/27/2010 13.2 3.2 5.6 5/3/2019 11.62 4.81 7.20 <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 in April/May 2004. <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 107 of 145 EKI B90088.03 <br />