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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-23 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a <br /> a� v <br /> 10 <br /> W <br /> L <br /> N <br /> +' 5 <br /> 3 � <br /> E 0 <br /> o c <br /> (D <br /> M -5 <br /> +' ll) W r` 00 Ql O r-I N M �t Lr) W r- 00 Ql O ri fV M �t U) W r� 00 Ql O ri N M LI) <br /> Ol Ol Ol Ol Ol O O O O O O O O O O c-I ri c-I c-I c-I c-I c-I c-I c-I -1 N N N N N N <br /> c6 [6 [6 (6 (0 [0 [0 (0 (6 (6 [6 c6 [6 [6 (6 [0 (0 (0 (6 (6 (6 [6 c6 [6 [6 (6 [0 [0 (0 (6 (6 <br /> Date <br /> MWM-23 MWM-23 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 1 10.94 13.33 MP 1 10.94 13.33 <br /> MP 2 5.97 8.36 MP 2 5.97 8.36 <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 /> 7/5/2005 7.24 3.70 6.09 1/25/2012 9.50 1.44 3.83 <br /> 7/19/2005 6.99 3.95 6.34 5/1/2012 9.40 1.54 3.93 <br /> 10/12/2005 7.38 3.56 5.95 7/26/2012 -- -- -- <br /> 1/31/2006 7.59 3.35 5.74 10/24/2012 4.65 1.32 3.71 <br /> 4/25/2006 6.56 4.38 6.77 1/30/2013 3.35 2.62 5.01 <br /> 7/19/2006 7.44 3.50 5.89 4/29/2013 3.45 2.52 4.91 <br /> 10/13/2006 9.91 1.03 3.42 7/31/2013 3.79 2.18 4.57 <br /> 1/23/2007 15.21 -4.27 -1.88 11/20/2013 3.79 2.18 4.57 <br /> 4/24/2007 11.55 -0.61 1.78 2/3/2014 4.19 1.78 4.17 <br /> 7/24/2007 11.60 -0.66 1.73 4/23/2014 4.34 1.63 4.02 <br /> 10/30/2007 11.14 -0.20 2.19 8/4/2014 4.12 1.85 4.24 <br /> 1/24/2008 10.13 0.81 3.20 10/29/2014 4.88 1.09 3.48 <br /> 4/15/2008 10.12 0.82 3.21 1/29/2015 3.78 2.19 4.58 <br /> 8/18/2008 11.47 -0.53 1.86 10/22/2015 5.12 0.85 3.24 <br /> 11/24/2008 10.83 0.11 2.50 10/27/2015 7.41 -1.44 0.95 <br /> 4/13/2009 10.00 0.94 3.33 4/22/2016 3.55 2.42 4.81 <br /> 7/28/2009 10.75 0.19 2.58 11/1/2016 4.11 1.86 4.25 <br /> 10/20/2009 11.06 -0.12 2.27 12/9/2016 4.28 1.69 4.08 <br /> 1/26/2010 10.13 0.81 3.20 5/4/2017 1.95 4.02 6.41 <br /> 5/4/2010 10.00 0.94 3.33 11/27/2017 4.25 1.72 4.11 <br /> 8/24/2010 10.25 0.69 3.08 5/4/2018 4.08 1.89 4.28 <br /> 10/27/2010 10.02 0.92 3.31 11/6/2018 5.08 0.89 3.28 <br /> 1/26/2011 9.19 1.75 4.14 4/29/2019 3.52 2.45 4.84 <br /> 4/21/2011 8.33 2.61 5.00 10/30/2019 4.90 1.07 3.46 <br /> 8/17/2011 9.17 1.77 4.16 5/6/2020 4.70 1.27 3.66 <br /> 10/26/2011 9.70 1.24 3.63 11/5/2020 6.57 -0.60 1.79 <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 Associated Engineering Group,August 2012 <br /> following modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured <br /> before August 2012 are calculated using MP 1 and after August 2012 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 /> (c) Open marker indicates questionable water level measurement. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 55 of 145 EKI B90088.03 <br />