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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 - MWR-28 <br /> Groundwater Elevation <br /> 00 15 <br /> 00 <br /> Q 10 <br /> o z <br /> > 5 <br /> v y <br /> at <br /> "' to 0 <br /> v v <br /> ++ " <br /> v -5 <br /> c E <br /> o -10 <br /> C7 -0 <br /> f6 -15 <br /> +1 <br /> a) Ln t0 r� 00 0) O -1 N M -zT Ln lD r\ 00 Ql O -1 N rn Ln Qo r� 00 (n O r-I fV CY) :I- Ln <br /> GJ Ql Ql Ql Ol M O O O O O O O O O O r I r I r-I r-I r-I r-I r-I r-I r-I r I 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 SL C C C C C C C C C <br /> co co co co ca ca ra ra ra ro co to to to to to to co co co co to co ca ra ra ra ro to co to <br /> Date <br /> MWR-28 MWR-28 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 9.55 11.94 MP 9.55 11.94 <br /> Groundwater Groundwater Groundwater <br /> Groundwater Elevation <br /> Date Sampled DTW(ft) Elevation Elevation Date Sampled DTW(ft) Elevation <br /> ft,NGVD 29 ft,NAVD 88 ft, NGVD 29 (ft,NAVD 88) <br /> 8/31/2005 7.38 2.17 4.56 7/24/2012 8.7 0.8 3.2 <br /> 11/29/2005 8.91 0.64 3.03 10/9/2012 4.9 4.7 7.1 <br /> 2/7/2006 7.85 1.70 4.09 1/29/2013 7.99 1.56 3.95 <br /> 4/25/2006 7.3 2.2 4.6 4/2/2013 8.4 1.1 3.5 <br /> 7/19/2006 6.9 2.6 5.0 7/20/2013 6.1 3.5 5.9 <br /> 10/13/2006 8.3 1.2 3.6 11/18/2013 9.1 0.4 2.8 <br /> 1/23/2007 8.8 0.7 3.1 1/28/2014 9.1 0.4 2.8 <br /> 4/24/2007 8.7 0.8 3.2 4/22/2014 8.7 0.8 3.2 <br /> 7/24/2007 6.5 3.0 5.4 7/31/2014 7.4 2.1 4.5 <br /> 10/30/2007 8.5 1.0 3.4 11/4/2014 7.9 1.6 4.0 <br /> 1/24/2008 8.2 1.3 3.7 1/30/2015 7.9 1.6 4.0 <br /> 4/15/2008 5.9 3.6 6.0 10/27/2015 9.6 -0.1 2.30 <br /> 8/21/2008 6.9 2.6 5.0 4/26/2016 7.9 1.6 4.0 <br /> 10/8/2008 8.8 0.7 3.1 11/4/2016 9.1 0.4 2.8 <br /> 2/9/2009 8.8 0.7 3.1 12/6/2016 9.04 0.51 2.90 <br /> 4/12/2009 9.1 0.4 2.8 5/8/2017 6.9 2.6 5.0 <br /> 8/4/2009 7.2 2.3 4.7 11/30/2017 9.54 0.01 2.40 <br /> 10/1/2009 6.7 2.8 5.2 5/4/2018 10.3 -0.8 1.6 <br /> 2/9/2010 7.6 1.9 4.3 11/8/2018 9.85 -0.30 2.09 <br /> 4/11/2010 8.2 1.3 3.7 5/3/2019 9.64 -0.09 2.30 <br /> 8/27/2010 -- -- -- 10/29/2019 10.37 -0.82 1.57 <br /> 10/3/2010 7.8 1.7 4.1 4/16/2020 10.60 -1.05 1.34 <br /> 1/18/2011 7.8 1.7 4.1 5/11/2020 8.34 1.21 3.60 <br /> 4/10/2011 7.2 2.3 4.7 11/3/2020 10.8 -1.27 1.12 <br /> 8/15/2011 5.8 3.7 6.1 5/5/2021 10.10 -0.55 1.84 <br /> 10/10/2011 7.3 2.2 4.6 10/20/2021 20.6 -11.0 -8.64 <br /> 1/26/2012 7.1 2.4 4.8 5/3/2022 19.15 -9.60 -7.21 <br /> 4/4/2012 8.4 1.1 3.5 11/8/2022 24.34 -14.79 -12.40 <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 Carlson, Barbee,&Gibson, October 2005. <br /> (b)Surveyed elevations referenced to NAVD 88 and converted to NGVD 29 by subtracting 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 represents questionable water level, likely due to dewatering activities in the vicinity of MWR-28. <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 131 of 145 EKI 1390088.03 <br />