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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-12 <br /> Groundwater Elevation <br /> 00 20 - <br /> 0 <br /> o z 15 <br /> � > 10 <br /> a� v <br /> W <br /> L <br /> 5 <br /> 3 <br /> v <br /> 3 0 <br /> 0 c <br /> c7 <br /> -5 <br /> 41 Ln lD r\ W M O r-I N M � Ln L,D I*, W M O .1 N M � Ln lD r� W M O r-I N M Ln <br /> Ql Ol Ol Ol Ol O O O O O O O O O O <br /> (lS clS [6 (6 [6 [6 (6 (l5 clS [6 [6 [6 [6 (6 (l5 [lS [6 [6 (6 [6 (6 (6 [lS [6 [6 (6 (0 (6 (6 [l5 c6 <br /> Date <br /> MWR-12 MWR-12 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 12.39 14.78 MID 12.39 14.78 <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 11.17 1.22 3.61 10/3/2010 9.9 2.5 4.9 <br /> 3/2/1999 9.99 2.40 4.79 1/18/2011 10.3 2.1 4.5 <br /> 4/12/1999 11.03 1.36 3.75 4/10/2011 9.9 2.5 4.9 <br /> 3/15/2004 10.72 1.67 4.06 8/15/2011 7.4 5.0 7.4 <br /> 9/27/2004 10.29 2.10 4.49 10/10/2011 9.4 3.0 5.4 <br /> 11/15/2004 11.01 1.38 3.77 1/26/2012 10.8 1.6 4.0 <br /> 2/24/2005 9.12 3.27 5.66 4/4/2012 9.7 2.7 5.1 <br /> 8/31/2005 9.26 3.13 5.52 7/24/2012 10.2 2.2 4.5 <br /> 11/30/2005 11.54 0.85 3.24 10/9/2012 10.0 2.4 4.74 <br /> 2/9/2006 10.44 1.95 4.34 1/29/2013 10.3 2.1 4.5 <br /> 4/25/2006 8.1 4.3 6.7 4/2/2013 10.5 1.9 4.3 <br /> 7/19/2006 7.3 5.1 7.5 7/20/2013 9.6 2.8 5.2 <br /> 10/13/2006 10.9 1.5 3.9 11/18/2013 11.8 0.6 3.0 <br /> 1/23/2007 11.3 1.1 3.5 1/28/2014 11.7 0.7 3.1 <br /> 4/24/2007 10.8 1.6 4.0 4/22/2014 9.0 3.4 5.8 <br /> 7/24/2007 7.9 4.5 6.9 7/31/2014 9.8 2.6 5.0 <br /> 10/30/2007 11.0 1.4 3.8 11/4/2014 10.7 1.7 4.1 <br /> 1/24/2008 10.5 1.9 4.3 1/30/2015 10.2 2.2 4.6 <br /> 4/15/2008 9.7 2.7 5.1 10/8/2015 10.16 2.23 4.62 <br /> 8/21/2008 9.1 3.3 5.7 10/27/2015 11.3 1.1 3.5 <br /> 10/8/2008 10.9 1.5 3.9 4/25/2016 8.5 3.9 6.3 <br /> 2/9/2009 11.4 1.0 3.4 11/4/2016 11.3 1.1 3.5 <br /> 4/12/2009 9.8 2.6 5.0 12/6/2016 11.58 0.81 3.20 <br /> 8/4/2009 8.0 4.4 6.8 5/8/2017 9.5 2.9 5.3 <br /> 10/1/2009 10.0 2.4 4.8 11/30/2017 12.12 0.27 2.66 <br /> 2/9/2010 10.1 2.3 4.7 5/4/2018 12.4 0.0 2.4 <br /> 4/11/2010 10.5 1.9 4.3 11/8/2018 13.76 -1.37 1.02 <br /> 8/27/2010 9.5 2.9 5.3 5/3/2019 12.08 0.31 2.70 <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 /> (c) MWR-12 was dry on 10/20/2021, 5/10/2022,and 11/8/2022 likely due to dewatering activities in the vicinity. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 120 of 145 EKI B90088.03 <br />