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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-6 <br /> Groundwater Elevation <br /> 20 <br /> 0 <br /> o z 15 <br /> �a a, <br /> ai 10 <br /> W � <br /> S <br /> o c <br /> 3 � <br /> v <br /> 3 0 <br /> 0 0 <br /> c7 M <br /> M -5 <br /> 41 <br /> G/ Ln 1.0 r� W M O c I N M � M 1.0 r� W M O ri N M � Ln 1.0 n W M O r-I N M � Ln <br /> GJ M M M M Ol 0 0 0 0 0 0 0 0 0 0 c I c I c I c I c I c I c I -1 r-1 r-1 N N N N N N <br /> co co co co co co co co co co co co ro ro ro ro ro ro ro ra ca ca ca ca co co co ca ca ra ra <br /> Date <br /> MWM-6 MWM-6 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 1 9.23 11.62 MP 1 9.23 11.62 <br /> MP 2 8.80 11.19 MP 2 8.80 11.19 <br /> Groundwater Groundwater Groundwater <br /> Groundwater Elevation <br /> Date Sampled DTW(ft) Elevation Elevation Date Sampled DTW(ft) Elevation <br /> ft,NGVD 29 ft,NAVD 88 ft,NGVD 29 (ft,NAVD 88) <br /> 5/23/2005 7.36 1.87 4.26 12/9/2016 7.20 1.60 3.99 <br /> 6/28/2005 7.56 1.67 4.06 5/4/2017 6.70 2.10 4.49 <br /> 10/12/2005 8.47 0.76 3.15 11/27/2017 6.60 2.20 4.59 <br /> 1/31/2006 6.62 2.61 5.00 5/4/2018 6.30 2.50 4.89 <br /> 4/25/2006 3.61 5.62 8.01 11/7/2018 7.08 1.72 4.11 <br /> 7/19/2006 8.26 0.97 3.36 4/29/2019 4.90 3.90 6.29 <br /> 10/13/2006 7.68 1.55 3.94 11/1/2019 6.88 1.92 4.31 <br /> 1/23/2007 7.47 1.76 4.15 5/6/2020 7.15 1.65 4.04 <br /> 4/24/2007 7.43 1.80 4.19 11/4/2020 7.28 1.52 3.91 <br /> 7/24/2007 7.89 1.34 3.73 5/3/2021 7.20 1.60 3.99 <br /> 10/30/2007 7.50 1.73 4.12 10/18/2021 7.56 1.24 3.63 <br /> 1/24/2008 7.20 2.03 4.42 4/29/2022 7.58 1.22 3.61 <br /> 4/15/2008 7.32 1.91 4.30 11/9/2022 7.34 1.46 3.85 <br /> 8/25/2008 7.38 1.85 4.24 3/24/2023 3.20 5.60 7.99 <br /> 11/17/2008 7.42 1.81 4.20 <br /> 2/17/2009 6.90 2.33 4.72 <br /> 4/13/2009 7.27 1.96 4.35 <br /> 7/27/2009 7.06 2.17 4.56 <br /> 10/19/2009 6.97 2.26 4.65 <br /> 1/25/2010 6.43 2.80 5.19 <br /> 4/21/2010 6.20 3.03 5.42 <br /> 10/13/2015 7.53 --(c) --(c) <br /> 10/27/2015 7.35 --(c) --(c) <br /> 4/22/2016 6.68 --(c) --(c) <br /> 11/1/2016 7.21 1.59 3.98 <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,September 2016 following <br /> modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured before <br /> September 2016 are calculated using MP 1 and after September 2016 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) Measuring point was damaged. Groundwater elevation could not be calculated. <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 28 of 145 EKI B90088.03 <br />