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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-3 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> M v <br /> > > 10 <br /> a a) <br /> W - <br /> i M <br /> GJ v <br /> +' H 5 <br /> 3 0 <br /> M <br /> 0 <br /> 0 c <br /> C7 <br /> M -5 <br /> d Ln lD r� W M O rl N M I Ln lD r� CO M O rl N M I Ln lD r*� W M O r1 N M Ln <br /> d Ol Ol 61 M M O O O O O O O O O O c-I rl c-I c-I c-I c-I c-I c-I rl c-I N N N N N N <br /> [6 (6 (0 (6 (6 [6 [6 [6 (6 (0 (6 (6 [6 c6 [6 (6 [0 (6 (6 (6 c6 [6 (6 [0 (6 (6 (6 c6 [6 (6 [6 <br /> Date <br /> RMW-3 RMW-3 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 22.48 24.87 MP 22.48 24.87 <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 18.97 3.51 5.90 8/23/2010 18.64 3.84 6.23 <br /> 9/28/2004 21.83 0.65 3.04 11/4/2010 18.33 4.15 6.54 <br /> 11/11/2004 21.26 1.22 3.61 1/19/2011 16.73 5.75 8.14 <br /> 9/23/2005 19.52 2.96 5.35 4/25/2011 15.46 7.02 9.41 <br /> 10/20/2005 19.41 3.07 5.46 8/19/2011 16.21 6.27 8.66 <br /> 11/21/2005 19.60 2.88 5.27 10/25/2011 16.65 5.83 8.22 <br /> 12/6/2005 18.91 3.57 5.96 1/23/2012 16.40 6.08 8.47 <br /> 1/31/2006 17.44 5.04 7.43 2/16/2012 16.30 6.18 8.57 <br /> 2/27/2006 17.27 5.21 7.60 4/27/2012 16.26 6.22 8.61 <br /> 3/3/2006 17.24 5.24 7.63 7/24/2012 17.22 5.26 7.65 <br /> 6/19/2006 16.08 6.40 8.79 10/30/2012 18.47 4.01 6.40 <br /> 8/24/2006 17.58 4.90 7.29 2/5/2013 16.51 5.97 8.36 <br /> 12/19/2006 17.22 5.26 7.65 5/3/2013 16.60 5.88 8.27 <br /> 2/12/2007 16.77 5.71 8.10 8/6/2013 18.09 4.39 6.78 <br /> 4/24/2007 16.57 5.91 8.30 11/22/2013 18.91 3.57 5.96 <br /> 7/24/2007 17.65 4.83 7.22 2/7/2014 19.09 3.39 5.78 <br /> 10/30/2007 18.31 4.17 6.56 4/29/2014 18.51 3.97 6.36 <br /> 1/24/2008 17.55 4.93 7.32 8/1/2014 19.48 3.00 5.39 <br /> 4/15/2008 16.91 5.57 7.96 11/3/2014 19.69 2.79 5.18 <br /> 8/25/2008 19.10 3.38 5.77 1/30/2015 18.04 4.44 6.83 <br /> 11/17/2008 18.86 3.62 6.01 9/30/2015 21.12 1.36 3.75 <br /> 2/19/2009 17.77 4.71 7.10 10/28/2015 20.28 2.20 4.59 <br /> 4/21/2009 17.34 5.14 7.53 4/25/2016 19.40 3.08 5.47 <br /> 7/27/2009 19.01 3.47 5.86 10/31/2016 20.61 1.87 4.26 <br /> 10/19/2009 19.41 3.07 5.46 12/7/2016 20.43 2.05 4.44 <br /> 1/25/2010 18.28 4.20 6.59 5/5/2017 15.55 6.93 9.32 <br /> 5/3/2010 16.70 5.78 8.17 11/28/2017 17.99 4.49 6.88 <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 97 of 145 EKI B90088.03 <br />