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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-1 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> a>i iv 10 <br /> W � <br /> d � <br /> 5 <br /> a c <br /> 3 � <br /> a, <br /> 3 0 <br /> o e <br /> c7 -0 <br /> m -5 <br /> W Ln �.O r` oo rn o N m v Ln �O r` oo rn o N m :t Ln �O r` oo rn o r-1 N m It Ln <br /> d 01 01 01 T T O O O O O O O O O O <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-1 MWM-1 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 1 15.18 17.57 MP 1 15.18 17.57 <br /> MP 2 11.83 14.22 MP 2 11.83 14.22 <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 /> 5/19/2005 9.15 6.03 8.42 10/27/2011 8.70 3.13 5.52 <br /> 6/28/2005 10.13 5.05 7.44 1/25/2012 9.50 2.33 4.72 <br /> 10/12/2005 13.58 1.60 3.99 5/3/2012 9.00 2.83 5.22 <br /> 1/31/2006 11.76 3.42 5.81 7/30/2012 10.17 1.66 4.05 <br /> 4/25/2006 6.81 8.37 10.76 10/25/2012 10.21 1.62 4.01 <br /> 7/19/2006 18.76 -3.58 -1.19 1/31/2013 10.32 1.51 3.90 <br /> 10/13/2006 13.19 1.99 4.38 5/1/2013 10.49 1.34 3.73 <br /> 1/23/2007 10.50 1.33 3.72 8/2/2013 10.67 1.16 3.55 <br /> 4/24/2007 10.27 1.56 3.95 11/21/2013 10.33 1.50 3.89 <br /> 7/24/2007 10.82 1.01 3.40 2/5/2014 10.96 0.87 3.26 <br /> 10/30/2007 10.12 1.71 4.10 4/24/2014 10.32 1.51 3.90 <br /> 1/24/2008 10.17 1.66 4.05 8/5/2014 10.70 1.13 3.52 <br /> 4/15/2008 10.13 1.70 4.09 10/30/2014 10.49 1.34 3.73 <br /> 8/25/2008 9.79 2.04 4.43 1/28/2015 10.85 0.98 3.37 <br /> 11/24/2008 10.06 1.77 4.16 10/27/2015 10.19 1.64 4.03 <br /> 2/17/2009 9.75 2.08 4.47 4/22/2016 9.70 2.13 4.52 <br /> 4/15/2009 9.95 1.88 4.27 11/1/2016 10.46 1.37 3.76 <br /> 7/27/2009 9.91 1.92 4.31 12/7/2016 11.06 0.77 3.16 <br /> 10/22/2009 9.70 2.13 4.52 5/4/2017 4.09 7.74 10.13 <br /> 2/1/2010 9.34 2.49 4.88 11/27/2017 9.76 2.07 4.46 <br /> 5/6/2010 8.83 3.00 5.39 5/4/2018 9.28 2.55 4.94 <br /> 8/26/2010 9.82 2.01 4.40 11/6/2018 9.79 2.04 4.43 <br /> 10/21/2010 9.90 1.93 4.32 4/29/2019 7.57 4.26 6.65 <br /> 1/25/2011 7.09 4.74 7.13 11/1/2019 9.98 1.85 4.24 <br /> 4/25/2011 4.36 7.47 9.86 5/6/2020 10.42 1.41 3.80 <br /> 8/18/2011 8.30 3.53 5.92 11/3/2020 10.33 1.50 3.89 <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,January 2007 following <br /> modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured before <br /> January 2007 are calculated using MP 1 and after January 2007 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 18 of 145 EKI B90088.03 <br />