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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-27 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai ai 10 <br /> W � <br /> S <br /> o c <br /> 3 � <br /> owl NFIOW-4141POO-9-1 W is qk*�� <br /> v <br /> 3 0 <br /> o c <br /> c7 0 <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 r-I N M � Ln 1.0 r� W M O r-I N M � Ln <br /> GJ Ol Ol Ol T T 0 0 0 0 0 0 0 0 0 0 1- 1- 1- 1- 1- 1- 1- 1- 1- 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-27 MWM-27 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 9.09 11.48 MID 9.09 11.48 <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 /> 7/30/2009 6.75 2.34 4.73 5/4/2017 1.75 7.34 9.73 <br /> 10/21/2009 6.82 2.27 4.66 11/27/2017 6.82 2.27 4.66 <br /> 1/26/2010 6.21 2.88 5.27 5/4/2018 6.10 2.99 5.38 <br /> 5/6/2010 6.38 2.71 5.10 11/6/2018 7.03 2.06 4.45 <br /> 8/25/2010 7.25 1.84 4.23 4/29/2019 4.55 4.54 6.93 <br /> 10/21/2010 10.21 -1.12 1.27 11/1/2019 6.77 2.32 4.71 <br /> 1/27/2011 4.76 4.33 6.72 5/6/2020 7.25 1.84 4.23 <br /> 4/25/2011 1.91 7.18 9.57 11/4/2020 7.12 1.97 4.36 <br /> 8/19/2011 5.6 3.49 5.88 5/4/2021 7.07 2.02 4.41 <br /> 10/27/2011 5.94 3.15 5.54 10/18/2021 7.22 1.87 4.26 <br /> 1/24/2012 6.91 2.18 4.57 4/29/2022 7.40 1.69 4.08 <br /> 5/3/2012 6.45 2.64 5.03 11/8/2022 7.37 1.72 4.11 <br /> 7/27/2012 7.23 1.86 4.25 3/24/2023 2.50 6.59 8.98 <br /> 10/24/2012 6.75 2.34 4.73 <br /> 1/31/2013 7.27 1.82 4.21 <br /> 5/1/2013 6.38 2.71 5.10 <br /> 8/1/2013 7.38 1.71 4.10 <br /> 11/21/2013 7.36 1.73 4.12 <br /> 2/4/2014 7.67 1.42 3.81 <br /> 4/23/2014 6.82 2.27 4.66 <br /> 8/5/2014 7.30 1.79 4.18 <br /> 10/30/2014 7.28 1.81 4.20 <br /> 1/28/2015 7.62 1.47 3.86 <br /> 10/22/2015 7.28 1.81 4.20 <br /> 10/27/2015 7.20 1.89 4.28 <br /> 4/22/2016 6.50 2.59 4.98 <br /> 11/1/2016 6.85 2.24 4.63 <br /> 12/9/2016 7.89 1.20 3.59 <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 by MacKay&Somps,April 2009. <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 62 of 145 EKI B90088.03 <br />