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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-11 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> > 10 <br /> W <br /> d � <br /> a c <br /> 3 � <br /> a, <br /> 3 0 <br /> C7o e <br /> -0 <br /> -5 <br /> a� Ln 1.0 r-- oo rn or-i N m v Ln �O 11`� oo rn or-1 N m � Ln �.o r*1 oo rn or-1 N m � Ln <br /> d 01 T T T T O O O O O O O O O O 1-I '-I '-I 1- 1- 1- 1- <br /> ca co co co co ca ca ca ca co co co co ca ca ca ca co co co co co co co co co co co co co co <br /> Date <br /> MWM-11 MWM-11 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 8.62 11.01 MP 8.62 11.01 <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 /> 5/23/2005 11.35 -2.73 -0.34 5/3/2012 7.40 1.22 3.61 <br /> 6/28/2005 10.10 -1.48 0.91 7/30/2012 7.94 0.68 3.07 <br /> 10/12/2005 -- -- -- 10/25/2012 7.93 0.69 3.08 <br /> 1/31/2006 9.39 -0.77 1.62 1/31/2013 7.60 1.02 3.41 <br /> 4/25/2006 6.23 2.39 4.78 5/1/2013 7.65 0.97 3.36 <br /> 7/19/2006 7.31 1.31 3.70 8/1/2013 8.16 0.46 2.85 <br /> 10/13/2006 9.51 -0.89 1.50 11/21/2013 8.04 0.58 2.97 <br /> 1/23/2007 8.62 0.00 2.39 2/5/2014 8.46 0.16 2.55 <br /> 4/24/2007 8.5 0.12 2.51 4/24/2014 8.07 0.55 2.94 <br /> 7/24/2007 8.34 0.28 2.67 8/5/2014 8.40 0.22 2.61 <br /> 10/30/2007 8.35 0.27 2.66 10/30/2014 8.30 0.32 2.71 <br /> 1/24/2008 6.94 1.68 4.07 1/29/2015 7.48 1.14 3.53 <br /> 4/15/2008 8.04 0.58 2.97 10/22/2015 8.58 0.04 2.43 <br /> 8/19/2008 8.40 0.22 2.61 10/27/2015 8.61 0.01 2.40 <br /> 11/25/2008 8.14 0.48 2.87 4/22/2016 7.13 1.49 3.88 <br /> 2/17/2009 7.75 0.87 3.26 11/1/2016 7.56 1.06 3.45 <br /> 4/14/2009 7.82 0.80 3.19 5/5/2017 6.19 2.43 4.82 <br /> 8/3/2009 8.16 0.46 2.85 11/27/2017 7.45 1.17 3.56 <br /> 10/26/2009 7.93 0.69 3.08 5/4/2018 7.05 1.57 3.96 <br /> 1/28/2010 7.58 1.04 3.43 11/7/2018 8.36 0.26 2.65 <br /> 4/22/2010 7.12 1.50 3.89 4/29/2019 6.94 1.68 4.07 <br /> 8/25/2010 7.72 0.90 3.29 11/1/2019 6.64 1.98 4.37 <br /> 10/28/2010 7.48 1.14 3.53 5/6/2020 7.58 1.04 3.43 <br /> 1/25/2011 7.24 1.38 3.77 11/3/2020 8.27 0.35 2.74 <br /> 4/26/2011 6.91 1.71 4.10 5/3/2021 8.00 0.62 3.01 <br /> 8/18/2011 7.22 1.40 3.79 10/19/2021 8.68 -0.06 2.33 <br /> 10/28/2011 7.55 1.07 3.46 4/29/2022 8.65 -0.03 2.36 <br /> 1/25/2012 7.28 1.34 3.73 11/8/2022 7.69 0.93 3.32 <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 34 of 145 EKI B90088.03 <br />