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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-1 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> ' <br /> M dp OR <br /> > > 10 <br /> W <br /> i M <br /> N � <br /> +' H 5 <br /> 3 0 <br /> a� <br /> 0 <br /> 0 c <br /> C7 <br /> -5 <br /> 1.r) W r� W M 0 .1 N m � Ln W r� W M 0 r-I N m Ln W I*, W M 0 .-1 N m Ln <br /> Ol 61 Ql Ql T O O O O O O O O O O r-I r-I r-I r-I c-I c-I c-I c-I ri c-I N N N N N N <br /> (6 [0 (6 (6 (6 c6 [6 (6 [6 [6 (6 (6 c6 [6 [6 (6 [6 (6 (6 [6 [6 [6 (6 (0 (6 (6 [6 [6 [6 (6 (0 <br /> Date <br /> RMW-1 RMW-1 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 20.39 22.78 MP 20.39 22.78 <br /> Groundwater Groundwater Groundwater <br /> Groundwater Elevation <br /> Date Sampled DTW(ft) Elevation Elevation Date Sampled DTW(ft) Elevation (ft, NAVD 88) <br /> ft NGVD 29 ft NAVD 88 ft NGVD 29 <br /> 4/2/2004 14.54 5.85 8.24 8/23/2010 15.49 4.90 7.29 <br /> 9/28/2004 16.93 3.46 5.85 11/4/2010 13.80 6.59 8.98 <br /> 11/11/2004 15.86 4.53 6.92 1/19/2011 12.43 7.96 10.35 <br /> 9/23/2005 14.66 5.73 8.12 4/25/2011 11.83 8.56 10.95 <br /> 10/20/2005 14.21 6.18 8.57 8/19/2011 13.55 6.84 9.23 <br /> 11/21/2005 14.09 6.30 8.69 10/25/2011 12.40 7.99 10.38 <br /> 12/6/2005 14.50 5.89 8.28 2/16/2012 12.41 7.98 10.37 <br /> 1/31/2006 12.62 7.77 10.16 4/27/2012 12.55 7.84 10.23 <br /> 2/27/2006 12.66 7.73 10.12 7/24/2012 14.3 6.09 8.48 <br /> 3/3/2006 12.55 7.84 10.23 10/30/2012 14.82 5.57 7.96 <br /> 6/19/2006 12.34 8.05 10.44 2/5/2013 12.65 7.74 10.13 <br /> 8/24/2006 13.75 6.64 9.03 5/3/2013 13.31 7.08 9.47 <br /> 12/19/2006 12.55 7.84 10.23 8/6/2013 14.66 5.73 8.12 <br /> 2/12/2007 12.49 7.90 10.29 11/22/2013 14.82 5.57 7.96 <br /> 4/24/2007 12.28 8.11 10.50 2/7/2014 15.35 5.04 7.43 <br /> 7/24/2007 13.78 6.61 9.00 4/29/2014 14.89 5.50 7.89 <br /> 10/30/2007 13.87 6.52 8.91 8/1/2014 15.59 4.80 7.19 <br /> 1/24/2008 13.13 7.26 9.65 11/3/2014 15.48 4.91 7.30 <br /> 4/15/2008 13.18 7.21 9.60 1/30/2015 13.94 6.45 8.84 <br /> 8/25/2008 15.07 5.32 7.71 9/30/2015 15.81 4.58 6.97 <br /> 11/17/2008 14.33 6.06 8.45 10/28/2015 16.20 4.19 6.58 <br /> 2/19/2009 13.40 6.99 9.38 4/25/2016 18.41 1.98 4.37 <br /> 4/21/2009 13.44 6.95 9.34 10/31/2016 16.07 4.32 6.71 <br /> 7/27/2009 15.15 5.24 7.63 12/7/2016 16.42 3.97 6.36 <br /> 10/19/2009 14.50 5.89 8.28 5/5/2017 12.21 8.18 10.57 <br /> 1/25/2010 14.00 6.39 8.78 11/28/2017 14.12 6.27 8.66 <br /> 5/3/2010 12.86 7.53 9.92 5/2/2018 13.91 6.48 8.87 <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 93 of 145 EKI 1390088.03 <br />