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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-21 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai ai 10 <br /> W � <br /> 4J � <br /> "' SOA <br /> o c <br /> 3 � <br /> v <br /> 3 as a <br /> o c <br /> c7 0 <br /> m -5 <br /> 41 <br /> G/ Ln 1.0 r� 00 M O -1 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 /> OJ 01 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-21 MWM-21 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 8.37 10.76 MID 8.37 10.76 <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 /> 5/24/2005 5.10 3.27 5.66 5/1/2012 5.90 2.47 4.86 <br /> 6/28/2005 4.99 3.38 5.77 7/26/2012 6.11 2.26 4.65 <br /> 10/12/2005 5.05 3.32 5.71 10/24/2012 6.59 1.78 4.17 <br /> 1/31/2006 5.24 3.13 5.52 1/30/2013 5.52 2.85 5.24 <br /> 4/25/2006 4.14 4.23 6.62 4/29/2013 5.58 2.79 5.18 <br /> 7/19/2006 5.34 3.03 5.42 8/1/2013 6.08 2.29 4.68 <br /> 10/13/2006 8.00 0.37 2.76 11/20/2013 6.30 2.07 4.46 <br /> 1/23/2007 9.11 -0.74 1.65 2/3/2014 6.44 1.93 4.32 <br /> 4/24/2007 8.04 0.33 2.72 4/23/2014 6.36 2.01 4.40 <br /> 7/24/2007 7.71 0.66 3.05 8/4/2014 6.61 1.76 4.15 <br /> 10/30/2007 7.78 0.59 2.98 10/29/2014 7.10 1.27 3.66 <br /> 1/24/2008 7.08 1.29 3.68 1/29/2015 5.58 2.79 5.18 <br /> 4/15/2008 6.55 1.82 4.21 10/22/2015 7.39 0.98 3.37 <br /> 8/18/2008 7.18 1.19 3.58 10/27/2015 7.40 0.97 3.36 <br /> 11/20/2008 7.30 1.07 3.46 4/22/2016 5.75 2.62 5.01 <br /> 2/11/2009 6.92 1.45 3.84 11/1/2016 6.72 1.65 4.04 <br /> 4/13/2009 6.51 1.86 4.25 12/9/2016 6.78 1.59 3.98 <br /> 7/28/2009 7.25 1.12 3.51 5/4/2017 4.80 3.57 5.96 <br /> 10/20/2009 7.51 0.86 3.25 11/27/2017 6.32 2.05 4.44 <br /> 1/26/2010 7.00 1.37 3.76 5/4/2018 6.28 2.09 4.48 <br /> 5/4/2010 6.65 1.72 4.11 11/6/2018 7.22 1.15 3.54 <br /> 8/24/2010 6.51 1.86 4.25 4/29/2019 6.70 1.67 4.06 <br /> 10/26/2010 6.41 1.96 4.35 10/30/2019 6.77 1.60 3.99 <br /> 1/26/2011 5.79 2.58 4.97 5/6/2020 6.06 2.31 4.70 <br /> 4/21/2011 5.02 3.35 5.74 11/5/2020 7.39 0.98 3.37 <br /> 8/17/2011 5.51 2.86 5.25 5/3/2021 7.88 0.49 2.88 <br /> 10/26/2011 6.11 2.26 4.65 10/18/2021 8.23 0.14 2.53 <br /> 1/24/2012 5.81 2.56 4.95 4/29/2022 9.50 -1.13 1.26 <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 51 of 145 EKI B90088.03 <br />