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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-25 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> M v <br /> > > 10 <br /> a� a) <br /> W <br /> L <br /> *' '^ 5 <br /> 3 0 <br /> 0 <br /> 0 c <br /> C7 <br /> -5 <br /> In LD r*- W M O .-1 N M � Ln lD r� W M O -1 N M � Ln lD I*, W M O r-I N M It Ln <br /> d O) M O) Q) Ql O O O O O O O O O O c-I c-I c-I c-I c-I c-I c-I c-I c-I c-I N N N N N fV <br /> [6 (6 [0 (6 (6 (6 c6 [6 (6 [6 [6 (6 (6 c6 [6 [6 [6 [6 (6 (6 [6 [6 [6 (6 [6 (6 (6 [6 [6 [6 (6 <br /> Date <br /> MWM-25 MWM-25 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MID 7.45 9.84 MID 7.45 9.84 <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 /> 5/25/2005 4.78 2.67 5.06 5/1/2012 6.15 1.30 3.69 <br /> 6/28/2005 5.17 2.28 4.67 7/26/2012 6.39 1.06 3.45 <br /> 10/12/2005 5.75 1.70 4.09 10/24/2012 8.56 -1.11 1.28 <br /> 1/31/2006 4.85 2.60 4.99 1/30/2013 5.66 1.79 4.18 <br /> 4/25/2006 4.10 3.35 5.74 4/29/2013 5.85 1.60 3.99 <br /> 7/19/2006 3.51 3.94 6.33 7/31/2013 6.21 1.24 3.63 <br /> 10/13/2006 5.55 1.90 4.29 11/20/2013 6.34 1.11 3.50 <br /> 1/23/2007 8.20 -0.75 1.64 2/3/2014 6.53 0.92 3.31 <br /> 4/24/2007 7.44 0.01 2.40 4/23/2014 7.36 0.09 2.48 <br /> 7/24/2007 7.37 0.08 2.47 8/4/2014 6.15 1.30 3.69 <br /> 10/30/2007 7.15 0.30 2.69 10/29/2014 7.05 0.40 2.79 <br /> 1/24/2008 5.66 1.79 4.18 1/28/2015 6.05 1.40 3.79 <br /> 4/15/2008 6.60 0.85 3.24 10/22/2015 7.32 0.13 2.52 <br /> 8/18/2008 7.52 -0.07 2.32 10/27/2015 7.31 0.14 2.53 <br /> 11/25/2008 7.24 0.21 2.60 4/22/2016 5.70 1.75 4.14 <br /> 2/11/2009 7.14 0.31 2.70 11/1/2016 6.19 1.26 3.65 <br /> 4/13/2009 6.43 1.02 3.41 12/9/2016 6.25 1.20 3.59 <br /> 7/28/2009 7.57 -0.12 2.27 5/4/2017 3.54 3.91 6.30 <br /> 10/20/2009 7.63 -0.18 2.21 11/27/2017 6.82 0.63 3.02 <br /> 1/26/2010 6.42 1.03 3.42 5/4/2018 6.18 1.27 3.66 <br /> 5/4/2010 6.23 1.22 3.61 11/6/2018 7.37 0.08 2.47 <br /> 8/24/2010 6.60 0.85 3.24 4/29/2019 5.04 2.41 4.80 <br /> 10/21/2010 6.51 0.94 3.33 10/30/2019 6.82 0.63 3.02 <br /> 1/26/2011 5.46 1.99 4.38 5/6/2020 6.85 0.60 2.99 <br /> 4/25/2011 4.27 3.18 5.57 11/5/2020 12.71 -5.26 -2.87 <br /> 8/17/2011 5.55 1.90 4.29 5/4/2021 8.78 -1.33 1.06 <br /> 10/26/2011 6.15 1.30 3.69 10/18/2021 9.23 -1.78 0.61 <br /> 1/25/2012 6.28 1.17 3.56 4/29/2022 7.40 0.05 2.44 <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 /> (c)Open marker indicates questionable water level measurement. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 59 of 145 EKI B90088.03 <br />