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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-3 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> > 10 <br /> W <br /> d <br /> 5 <br /> a c <br /> 3 � <br /> a, <br /> 3 0 <br /> o e <br /> C7 0 <br /> ++ <br /> -5 <br /> a� Ln 1.0 r-. oo rn o c14 m v Ln �O r� oo rn o N m � Ln �.o r*1 oo rn o m � Ln <br /> d 01 01 01 01 M O O O O O O O O O O N N N N N N <br /> ca co co co co ca ca ca ca co co co co ca ca ca ca co co co co co co co co co co co co co co <br /> Date <br /> MWR-3 MWR-3 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MID 12.27 14.66 MP 12.27 14.66 <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 9.28 2.99 5.38 10/3/2010 10.86 1.41 3.8 <br /> 3/2/1999 8.23 4.04 6.43 1/18/2011 10.5 1.8 4.2 <br /> 4/13/1999 8.97 3.30 5.69 4/10/2011 8.9 3.4 5.8 <br /> 3/15/2004 9.06 3.21 5.60 8/15/2011 8.6 3.7 6.1 <br /> 9/27/2004 9.59 2.68 5.07 10/10/2011 9.5 2.8 5.2 <br /> 11/15/2004 9.91 2.36 4.75 1/26/2012 10.8 1.5 3.9 <br /> 2/24/2005 9.05 3.22 5.61 4/4/2012 8.0 4.3 6.7 <br /> 8/31/2005 9.74 2.53 4.92 7/24/2012 9.97 2.30 4.69 <br /> 11/28/2005 10.87 1.40 3.79 10/9/2012 10.49 1.78 4.17 <br /> 2/8/2006 9.77 2.50 4.89 1/28/2013 9.84 2.43 4.82 <br /> 4/25/2006 6.5 5.8 8.2 4/26/2013 10.62 1.65 4.04 <br /> 7/19/2006 9.1 3.2 5.6 7/20/2013 9.4 2.9 5.3 <br /> 10/13/2006 9.5 2.8 5.2 11/18/2013 11.03 1.24 3.63 <br /> 1/23/2007 11.4 0.9 3.3 1/28/2014 10.9 1.4 3.8 <br /> 4/24/2007 11.5 0.8 3.2 4/22/2014 10.7 1.6 4.0 <br /> 7/24/2007 11.4 0.9 3.3 7/31/2014 10.3 2.0 4.4 <br /> 10/30/2007 11.4 0.9 3.3 11/4/2014 10.3 2.0 4.4 <br /> 1/24/2008 11.1 1.2 3.6 1/29/2015 8.9 3.4 5.8 <br /> 4/15/2008 11.1 1.2 3.6 10/27/2015 14.8 -2.5 -0.1 <br /> 8/21/2008 11.5 0.8 3.2 4/25/2016 10.2 2.1 4.5 <br /> 10/8/2008 11.7 0.6 3.0 11/4/2016 9.5 2.8 5.2 <br /> 2/9/2009 11.3 1.0 3.4 12/6/2016 9.23 3.04 5.43 <br /> 4/12/2009 11.9 0.4 2.8 5/8/2017 6.8 5.5 7.9 <br /> 8/4/2009 10.7 1.6 4.0 11/30/2017 10.18 2.09 4.48 <br /> 10/1/2009 11.2 1.1 3.5 5/4/2018 10.0 2.3 4.7 <br /> 2/9/2010 10.8 1.5 3.9 11/7/2018 9.95 2.32 4.71 <br /> 4/11/2010 10.8 1.5 3.9 5/3/2019 9.06 3.21 5.60 <br /> 8/27/2010 10.6 1.7 4.1 10/29/2019 9.94 2.33 4.72 <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 105 of 145 EKI B90088.03 <br />