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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-9 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai 10 <br /> W � <br /> "' <br /> o 5 c <br /> 3 � <br /> v <br /> c E 0 <br /> `Ln 0 <br /> V <br /> 4 <br /> -5 <br /> 1 <br /> Gl Ln 1.0 r� W M O c I N M � Ln l0 r� W M O ri N M :I- Ln 1.0 r� W M O r-I N M � Ln <br /> GJ M M M M M 0 0 0 0 0 0 0 0 0 0 -1 c I -1 -1 -1 -1 -1 -1 -1 -1 N N N N N N <br /> �-- C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C <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-9 MWM-9 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 11.63 14.02 MID 11.63 14.02 <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 12.30 -0.67 1.72 5/3/2012 9.32 2.31 4.70 <br /> 6/28/2005 12.83 -1.20 1.19 7/31/2012 10.89 0.74 3.13 <br /> 10/12/2005 12.84 -1.21 1.18 10/25/2012 10.90 0.73 3.12 <br /> 1/31/2006 11.71 -0.08 2.31 1/31/2013 10.12 1.51 3.90 <br /> 4/25/2006 9.47 2.16 4.55 5/1/2013 10.72 0.91 3.30 <br /> 7/19/2006 11.47 0.16 2.55 8/2/2013 11.16 0.47 2.86 <br /> 10/13/2006 11.90 -0.27 2.12 11/21/2013 11.73 -0.10 2.29 <br /> 1/23/2007 11.10 0.53 2.92 2/5/2014 11.52 0.11 2.50 <br /> 4/24/2007 11.48 0.15 2.54 4/24/2014 11.29 0.34 2.73 <br /> 7/24/2007 11.81 -0.18 2.21 8/7/2014 11.51 0.12 2.51 <br /> 10/30/2007 11.35 0.28 2.67 11/3/2014 11.25 0.38 2.77 <br /> 1/24/2008 10.47 1.16 3.55 1/29/2015 11.05 0.58 2.97 <br /> 4/15/2008 11.19 0.44 2.83 10/22/2015 11.20 0.43 2.82 <br /> 8/19/2008 10.44 1.19 3.58 10/27/2015 11.10 0.53 2.92 <br /> 11/25/2008 10.14 1.49 3.88 4/22/2016 10.30 1.33 3.72 <br /> 2/18/2009 9.24 2.39 4.78 11/1/2016 11.33 0.30 2.69 <br /> 4/14/2009 9.63 2.00 4.39 12/7/2016 11.54 0.09 2.48 <br /> 8/3/2009 10.10 1.53 3.92 5/5/2017 9.05 2.58 4.97 <br /> 10/26/2009 10.24 1.39 3.78 11/27/2017 10.23 1.40 3.79 <br /> 1/27/2010 9.20 2.43 4.82 5/4/2018 10.61 1.02 3.41 <br /> 4/21/2010 9.43 2.20 4.59 11/6/2018 10.89 0.74 3.13 <br /> 8/24/2010 9.61 2.02 4.41 4/29/2019 12.01 -0.38 2.01 <br /> 10/20/2010 9.98 1.65 4.04 10/31/2019 10.90 0.73 3.12 <br /> 1/24/2011 8.80 2.83 5.22 5/8/2020 11.05 0.58 2.97 <br /> 4/21/2011 7.75 3.88 6.27 11/3/2020 11.18 0.45 2.84 <br /> 8/18/2011 9.21 2.42 4.81 5/4/2021 11.40 0.23 2.62 <br /> 10/28/2011 9.80 1.83 4.22 10/19/2021 11.56 0.07 2.46 <br /> 1/24/2012 9.59 2.04 4.43 5/4/2022 11.40 0.23 2.62 <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 31 of 145 EKI B90088.03 <br />