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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 - RMW-2 <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 61 O O O O O O O O O O r-I r-I r-I r-I r-I r-I r-I r-I r-I r-I N N N N N N <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 /> RMW-2 RMW-2 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 21.87 24.26 MP 21.87 24.26 <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 /> 4/2/2004 18.83 3.04 5.43 8/23/2010 18.50 3.37 5.76 <br /> 9/28/2004 22.28 -0.41 1.98 11/4/2010 18.46 3.41 5.80 <br /> 11/11/2004 21.11 0.76 3.15 1/19/2011 16.67 5.20 7.59 <br /> 9/23/2005 19.64 2.23 4.62 4/25/2011 15.21 6.66 9.05 <br /> 10/20/2005 19.48 2.39 4.78 8/19/2011 16.36 5.51 7.90 <br /> 11/21/2005 18.82 3.05 5.44 10/25/2011 16.68 5.19 7.58 <br /> 12/6/2005 18.55 3.32 5.71 1/23/2012 16.01 5.86 8.25 <br /> 1/31/2006 16.93 4.94 7.33 2/16/2012 15.89 5.98 8.37 <br /> 2/27/2006 16.71 5.16 7.55 4/27/2012 15.9 5.97 8.36 <br /> 3/3/2006 16.62 5.25 7.64 7/24/2012 17.12 4.75 7.14 <br /> 6/19/2006 15.61 6.26 8.65 10/30/2012 18.60 3.27 5.66 <br /> 8/24/2006 17.45 4.42 6.81 2/5/2013 16.38 5.49 7.88 <br /> 12/19/2006 16.82 5.05 7.44 5/3/2013 16.34 5.53 7.92 <br /> 2/12/2007 16.28 5.59 7.98 8/6/2013 18.19 3.68 6.07 <br /> 4/24/2007 16.19 5.68 8.07 11/22/2013 18.82 3.05 5.44 <br /> 7/24/2007 17.55 4.32 6.71 2/7/2014 18.84 3.03 5.42 <br /> 10/30/2007 18.42 3.45 5.84 4/29/2014 18.39 3.48 5.87 <br /> 1/24/2008 17.39 4.48 6.87 8/1/2014 19.67 2.20 4.59 <br /> 4/15/2008 16.65 5.22 7.61 11/3/2014 19.55 2.32 4.71 <br /> 8/25/2008 19.49 2.38 4.77 1/30/2015 17.71 4.16 6.55 <br /> 11/17/2008 18.93 2.94 5.33 9/30/2015 20.42 1.45 3.84 <br /> 2/19/2009 17.40 4.47 6.86 10/28/2015 20.51 1.36 3.75 <br /> 4/21/2009 17.10 4.77 7.16 4/25/2016 17.85 4.02 6.41 <br /> 7/27/2009 19.29 2.58 4.97 10/31/2016 21.17 0.70 3.09 <br /> 10/19/2009 19.58 2.29 4.68 12/7/2016 20.14 1.73 4.12 <br /> 1/25/2010 17.95 3.92 6.31 5/5/2017 15.02 6.85 9.24 <br /> 5/3/2010 16.40 5.47 7.86 11/28/2017 17.64 4.23 6.62 <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 and reported in Kleinfelder(2004) "Groundwater Monitoring Well Installation,Sampling,and Analysis, <br /> Reiter Property, Lathrop, California,"dated 5 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) Per Regional Water Quality Control Board letter dated 3 May 2021, monitoring is no longer required. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 95 of 145 EKI B90088.03 <br />