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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-12 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> ai 10 <br /> W � <br /> 4J � <br /> S <br /> o c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 M <br /> m -5 <br /> 41 <br /> G/ Ln 1.0 n 00 Ql O r-I N M I Ln l0 n W M O ri N M I u1 1.0 n W M O ri N M I Ln <br /> OJ 01 Ol Ol T T 0 0 0 0 0 0 0 0 0 0 ri ri ri ri ri ri ri ri ri ri N N N N N N <br /> co co co co co c0 c0 c0 c0 c0 c0 c0 (0 (0 (0 (0 (0 (0 (0 (6 c0 c6 c6 c6 c6 c6 c0 ca ca ra ra <br /> Date <br /> MWM-12 MWM-12 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 11.13 13.52 MP 11.13 13.52 <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 /> 6/28/2005 9.37 1.76 4.15 5/3/2012 8.80 2.33 4.72 <br /> 7/19/2005 10.33 0.80 3.19 7/30/2012 10.02 1.11 3.50 <br /> 10/12/2005 11.56 -0.43 1.96 10/25/2012 9.84 1.29 3.68 <br /> 1/31/2006 10.71 0.42 2.81 1/31/2013 8.64 2.49 4.88 <br /> 5/2/2006 7.65 3.48 5.87 5/1/2013 9.95 1.18 3.57 <br /> 7/19/2006 10.02 1.11 3.50 8/1/2013 9.85 1.28 3.67 <br /> 10/13/2006 12.96 -1.83 0.56 11/21/2013 9.87 1.26 3.65 <br /> 1/23/2007 10.13 1.00 3.39 2/5/2014 10.08 1.05 3.44 <br /> 4/24/2007 9.5 1.63 4.02 4/24/2014 10.03 1.10 3.49 <br /> 7/24/2007 8.81 2.32 4.71 8/5/2014 10.38 0.75 3.14 <br /> 10/30/2007 11.20 -0.07 2.32 11/3/2014 11.20 -0.07 2.32 <br /> 1/24/2008 7.18 3.95 6.34 1/29/2015 9.20 1.93 4.32 <br /> 4/15/2008 7.55 3.58 5.97 10/22/2015 10.70 0.43 2.82 <br /> 8/25/2008 7.93 3.20 5.59 10/27/2015 10.75 0.38 2.77 <br /> 11/14/2008 10.23 0.90 3.29 4/22/2016 9.18 1.95 4.34 <br /> 2/18/2009 8.15 2.98 5.37 11/1/2016 10.18 0.95 3.34 <br /> 4/15/2009 8.20 2.93 5.32 12/9/2016 10.08 1.05 3.44 <br /> 7/29/2009 8.80 2.33 4.72 5/4/2017 5.97 5.16 7.55 <br /> 10/22/2009 9.32 1.81 4.20 11/27/2017 9.40 1.73 4.12 <br /> 1/28/2010 7.11 4.02 6.41 5/4/2018 9.29 1.84 4.23 <br /> 4/22/2010 8.81 2.32 4.71 11/5/2018 10.52 0.61 3.00 <br /> 8/26/2010 10.60 0.53 2.92 4/29/2019 8.74 2.39 4.78 <br /> 10/28/2010 9.89 1.24 3.63 11/1/2019 9.95 1.18 3.57 <br /> 1/25/2011 8.12 3.01 5.40 5/6/2020 9.56 1.57 3.96 <br /> 4/26/2011 8.35 2.78 5.17 11/3/2020 10.22 0.91 3.30 <br /> 8/18/2011 9.00 2.13 4.52 5/4/2021 10.30 0.83 3.22 <br /> 10/27/2011 9.00 2.13 4.52 10/19/2021 10.94 0.19 2.58 <br /> 1/25/2012 8.77 2.36 4.75 4/29/2022 10.28 0.85 3.24 <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,July 2005. <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 36 of 145 EKI B90088.03 <br />