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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-4 <br /> Groundwater Elevation <br /> 000 20 <br /> 0 <br /> o z 15 <br /> ai 10 <br /> W <br /> GJ � <br /> 3 5� <br /> v <br /> 0 <br /> o c <br /> c7 M <br /> -5 <br /> 41 u'f lD r, W Ql O -I N M � u'1 lD r, 00 Ql O r-I N CO � uO lD I, 00 Ql O c-I N M � u'f <br /> GJ 01 01 01 T T O O O O O O O O O O 1- 1- 1- 1- 1- 1- 1- 1- <br /> co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co <br /> Date <br /> MWM-4 MWM-4 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 11.67 14.06 MP 11.67 14.06 <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 /> 5/19/2005 10.42 1.25 3.64 7/30/2012 10.39 1.28 3.67 <br /> 6/28/2005 10.69 0.98 3.37 10/25/2012 10.33 1.34 3.73 <br /> 10/12/2005 11.60 0.07 2.46 1/31/2013 9.70 1.97 4.36 <br /> 1/31/2006 10.50 1.17 3.56 5/2/2013 10.35 1.32 3.71 <br /> 4/25/2006 7.45 4.22 6.61 8/2/2013 10.79 0.88 3.27 <br /> 7/19/2006 12.49 -0.82 1.57 11/20/2013 11.72 -0.05 2.34 <br /> 10/13/2006 11.15 0.52 2.91 2/4/2014 11.02 0.65 3.04 <br /> 1/23/2007 10.38 1.29 3.68 4/24/2014 10.76 0.91 3.30 <br /> 4/24/2007 10.65 1.02 3.41 8/5/2014 10.98 0.69 3.08 <br /> 7/24/2007 11.25 0.42 2.81 10/30/2014 10.80 0.87 3.26 <br /> 10/30/2007 10.39 1.28 3.67 1/28/2015 10.71 0.96 3.35 <br /> 1/24/2008 9.90 1.77 4.16 10/22/2015 10.24 1.43 3.82 <br /> 4/15/2008 9.73 1.94 4.33 10/27/2015 10.25 1.42 3.81 <br /> 8/25/2008 9.78 1.89 4.28 4/22/2016 9.58 2.09 4.48 <br /> 11/24/2008 9.73 1.94 4.33 11/1/2016 10.72 0.95 3.34 <br /> 4/15/2009 9.02 2.65 5.04 12/7/2016 11.07 0.60 2.99 <br /> 7/29/2009 9.30 2.37 4.76 5/4/2017 7.15 4.52 6.91 <br /> 10/22/2009 9.55 2.12 4.51 11/27/2017 9.89 1.78 4.17 <br /> 2/1/2010 8.74 2.93 5.32 11/27/2017 10.25 1.42 3.81 <br /> 4/22/2010 8.42 3.25 5.64 5/4/2018 9.90 1.77 4.16 <br /> 8/26/2010 9.59 2.08 4.47 11/7/2018 10.27 1.40 3.79 <br /> 10/25/2010 9.49 2.18 4.57 4/29/2019 8.71 2.96 5.35 <br /> 1/25/2011 7.68 3.99 6.38 10/29/2019 10.47 1.20 3.59 <br /> 4/25/2011 6.71 4.96 7.35 5/6/2020 9.80 1.87 4.26 <br /> 8/18/2011 8.60 3.07 5.46 11/3/2020 10.90 0.77 3.16 <br /> 10/27/2011 8.81 2.86 5.25 5/3/2021 11.10 0.57 2.96 <br /> 1/24/2012 9.82 1.85 4.24 10/20/2021 11.28 0.39 2.78 <br /> 5/3/2012 8.86 2.81 5.20 4/29/2022 11.12 0.55 2.94 <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 24 of 145 EKI B90088.03 <br />