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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-31 <br /> Groundwater Elevation <br /> cO 20 <br /> 00 <br /> o z 15 <br /> > > 10 <br /> W � <br /> L <br /> 5 <br /> o c <br /> Qj <br /> 3 Qj <br /> 3 0 <br /> O <br /> O <br /> M -5 <br /> d Ln lD r� W M O -1 N m � Ln W r� W Ql O r-1 N m Ln W r� W 01 O c-I N m � Ln <br /> Ql Ql Ql T T O O O O O O O O O O c-1 ri ri ci ci ci ci c-I c-I c-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 C C C C C C C C C C C C <br /> f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 (6 (6 (6 (6 (6 (6 (6 (6 (6 (6 (6 f6 f6 f6 (6 (6 (6 (6 f6 f6 f6 <br /> Date <br /> MWR-31 MWR-31 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 8.12 10.51 MP 8.12 10.51 <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 7.19 0.93 3.32 7/24/2012 5.3 2.9 5.3 <br /> 11/29/2005 8.08 0.04 2.43 10/9/2012 7.9 0.3 2.7 <br /> 2/8/2006 7.25 0.87 3.26 1/29/2013 7.7 0.4 2.8 <br /> 4/25/2006 6.0 2.1 4.5 4/2/2013 7.8 0.3 2.7 <br /> 7/19/2006 7.9 0.2 2.6 7/20/2013 7.8 0.4 2.8 <br /> 10/13/2006 7.3 0.8 3.2 11/18/2013 8.1 0.0 2.4 <br /> 1/23/2007 7.9 0.2 2.6 1/28/2014 7.0 1.1 3.5 <br /> 4/24/2007 5.7 2.4 4.8 4/22/2014 8.3 -0.2 2.2 <br /> 7/24/2007 6.8 1.3 3.7 7/31/2014 7.4 0.7 3.1 <br /> 10/30/2007 7.7 0.4 2.8 11/4/2014 7.8 0.3 2.7 <br /> 2/7/2008 6.7 1.4 3.8 1/29/2015 7.6 0.5 2.9 <br /> 4/15/2008 7.0 1.1 3.5 10/8/2015 8.11 0.01 2.40 <br /> 8/21/2008 7.4 0.7 3.1 10/27/2015 8.3 -0.2 2.2 <br /> 10/8/2008 7.9 0.2 2.6 4/25/2016 7.5 0.6 3.0 <br /> 2/9/2009 7.3 0.8 3.2 11/4/2016 7.8 0.3 2.7 <br /> 4/12/2009 6.3 1.8 4.2 12/6/2016 8.18 -0.06 2.33 <br /> 8/4/2009 8.2 -0.1 2.3 5/8/2017 5.4 2.7 5.1 <br /> 10/1/2009 7.4 0.7 3.1 11/30/2017 8.08 0.04 2.43 <br /> 2/9/2010 7.4 0.7 3.1 5/4/2018 7.9 0.2 2.6 <br /> 4/11/2010 7.6 0.5 2.9 11/7/2018 7.70 0.42 2.81 <br /> 8/27/2010 7.6 0.5 2.9 5/3/2019 7.61 0.51 2.90 <br /> 10/3/2010 7.2 0.9 3.3 10/29/2019 7.05 1.07 3.46 <br /> 1/18/2011 7.4 0.7 3.1 4/16/2020 7.50 0.62 3.01 <br /> 4/10/2011 6.7 1.4 3.8 11/3/2020 7.2 0.88 3.27 <br /> 8/15/2011 6.9 1.2 3.6 5/5/2021 8.00 0.12 2.51 <br /> 10/10/2011 7.3 0.8 3.2 10/20/2021 8.9 -0.80 1.59 <br /> 1/26/2012 7.9 0.2 2.6 5/10/2022 9.79 -1.67 0.72 <br /> 4/4/2012 7.8 0.3 2.7 11/7/2022 14.60 -6.48 -4.09 <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-31. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 137 of 145 EKI B90088.03 <br />