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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-27 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> Z; -- <br /> v �a 10 <br /> _ <br /> W <br /> +� a 5 <br /> 3 M <br /> 0 <br /> o <br /> c7 0 <br /> M -5 <br /> 411 U1 lD r� 00 Ql O ri N M �t Ln lD I1% 00 Ql O ri fV rn �t Ln W r\ 00 M O r-I N M � Ln <br /> Ql Ql Ql Ql Ql 0 0 0 0 0 0 0 0 0 0 ri ri ri ri ri ri ri ri ri ri CV fV N N N N <br /> I I I I I <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 cv cv cv cv cv cv cv cv cv cv co co to to to to to to co co co co co ra ra ra ro � <br /> Date <br /> MWR-27 MWR-27 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 8.49 10.88 MP 8.49 10.88 <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 /> 8/31/2005 7.85 0.64 3.03 7/25/2012 6.09 2.40 4.79 <br /> 11/28/2005 8.41 0.08 2.47 10/9/2012 6.85 1.64 4.03 <br /> 2/7/2006 8.05 0.44 2.83 1/29/2013 7.69 0.80 3.19 <br /> 4/25/2006 7.8 0.7 3.1 4/2/2013 7.7 0.8 3.2 <br /> 7/19/2006 7.8 0.7 3.1 7/20/2013 5.0 3.5 5.9 <br /> 10/13/2006 8.2 0.3 2.7 11/18/2013 8.0 0.5 2.9 <br /> 1/23/2007 8.3 0.2 2.6 1/28/2014 8.2 0.3 2.7 <br /> 4/24/2007 7.3 1.2 3.6 4/22/2014 8.0 0.5 2.9 <br /> 7/24/2007 7.3 1.2 3.6 7/31/2014 7.3 1.2 3.6 <br /> 10/30/2007 8.3 0.2 2.6 11/4/2014 7.8 0.7 3.1 <br /> 1/24/2008 7.7 0.8 3.2 1/30/2015 7.7 0.8 3.2 <br /> 4/15/2008 7.1 1.4 3.8 10/8/2015 7.90 0.59 2.98 <br /> 8/21/2008 7.4 1.1 3.5 10/27/2015 8.5 0.0 2.4 <br /> 10/8/2008 8.3 0.2 2.6 4/25/2016 7.6 0.9 3.3 <br /> 2/9/2009 8.1 0.4 2.8 11/4/2016 8.7 -0.2 2.2 <br /> 4/12/2009 8.8 -0.3 2.1 12/6/2016 3.16 5.33 7.72 <br /> 8/4/2009 5.9 2.6 5.0 5/8/2017 7.4 1.1 3.5 <br /> 10/1/2009 7.7 0.8 3.2 11/30/2017 9.08 -0.59 1.80 <br /> 2/9/2010 7.6 0.9 3.3 5/4/2018 10.4 -1.9 0.5 <br /> 4/11/2010 8.0 0.5 2.9 11/8/2018 8.05 0.44 2.83 <br /> 8/27/2010 5.7 2.8 5.2 5/3/2019 9.08 -0.59 1.80 <br /> 10/3/2010 7.2 1.3 3.7 10/29/2019 7.33 1.16 3.55 <br /> 1/18/2011 7.5 1.0 3.4 4/16/2020 8.70 -0.21 2.18 <br /> 4/10/2011 7.0 1.5 3.9 11/3/2020 8.7 -0.22 2.17 <br /> 8/15/2011 6.9 1.6 4.0 5/5/2021 8.54 -0.05 2.34 <br /> 10/10/2011 7.1 1.4 3.8 10/20/2021 11.8 -3.3 -0.9 <br /> 1/26/2012 7.4 1.1 3.5 5/10/2022 12.22 -3.73 -1.34 <br /> 4/4/2012 7.9 0.6 3.0 11/7/2022 Dry Dry Dry <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) MWR-27 was dry on 11/7/2022 likely due to dewatering activities in the vicinity. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 129 of 145 EKI B90088.03 <br />