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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- MWM-24 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> > 10 <br /> W <br /> d � <br /> a c <br /> 3 � <br /> a, <br /> 3 0 <br /> C7o e <br /> -0 <br /> -5 <br /> a� Ln 1.0 r` oo rn o r-i N m v Ln �.O r` oo rn o r-1 N m � Ln �.O r` oo rn o -1 N m � Ln <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 /> MWM-24 MWM-24 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 1 10.38 12.77 MP 1 10.38 12.77 <br /> MP 2 14.49 16.88 MP 2 14.49 16.88 <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 /> 5/24/2005 6.80 3.58 5.97 10/26/2011 12.79 1.70 4.09 <br /> 6/28/2005 8.41 1.97 4.36 1/25/2012 13.20 1.29 3.68 <br /> 10/12/2005 8.82 1.56 3.95 5/1/2012 13.01 1.48 3.87 <br /> 1/31/2006 7.57 2.81 5.20 7/26/2012 13.32 1.17 3.56 <br /> 4/25/2006 5.02 5.36 7.75 10/24/2012 13.25 1.24 3.63 <br /> 7/19/2006 8.08 2.30 4.69 1/30/2013 13.56 0.93 3.32 <br /> 10/13/2006 8.32 2.06 4.45 4/29/2013 12.94 1.55 3.94 <br /> 1/23/2007 9.63 0.75 3.14 7/31/2013 13.49 1.00 3.39 <br /> 4/24/2007 8.67 1.71 4.10 11/20/2013 13.81 0.68 3.07 <br /> 7/24/2007 9.42 0.96 3.35 2/3/2014 13.80 0.69 3.08 <br /> 10/30/2007 9.02 1.36 3.75 4/23/2014 13.81 0.68 3.07 <br /> 1/24/2008 8.90 1.48 3.87 8/4/2014 11.51 2.98 5.37 <br /> 4/15/2008 9.32 1.06 3.45 10/29/2014 13.60 0.89 3.28 <br /> 8/18/2008 9.23 1.15 3.54 1/28/2015 13.80 0.69 3.08 <br /> 11/25/2008 9.70 0.68 3.07 10/22/2015 13.62 0.87 3.26 <br /> 2/11/2009 9.36 1.02 3.41 10/27/2015 13.50 0.99 3.38 <br /> 4/13/2009 9.23 1.15 3.54 4/22/2016 12.81 1.68 4.07 <br /> 7/28/2009 9.93 0.45 2.84 11/1/2016 13.02 1.47 3.86 <br /> 10/20/2009 9.06 1.32 3.71 12/9/2016 13.47 1.02 3.41 <br /> 1/26/2010 -- -- -- 5/4/2017 10.21 4.28 6.67 <br /> 5/4/2010 -- -- -- 11/27/2017 13.54 0.95 3.34 <br /> 8/24/2010 13.40 1.09 3.48 5/4/2018 12.55 1.94 4.33 <br /> 10/20/2010 13.36 1.13 3.52 11/6/2018 13.44 1.05 3.44 <br /> 1/26/2011 11.89 2.60 4.99 4/29/2019 12.30 2.19 4.58 <br /> 4/21/2011 10.55 3.94 6.33 10/30/2019 12.94 1.55 3.94 <br /> 8/17/2011 12.41 2.08 4.47 5/6/2020 13.30 1.19 3.58 <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 1 elevation surveyed by MacKay&Somps,July 2005. MP 2 elevation surveyed by MacKay&Somps,August 2010 following <br /> modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured before <br /> August 2010 are calculated using MP 1 and after August 2010 are calculated using MP 2. <br /> (b)Surveyed elevations referenced to NGVD 29 and converted to NAVD 88 by adding 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 57 of 145 EKI B90088.03 <br />