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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 /> MWM-22 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 10.77 13.16 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 4/13/2009 9.40 1.37 3.76 <br /> 7/28/2009 9.32 1.45 3.84 <br /> 10/20/2009 9.09 1.68 4.07 <br /> 1/26/2010 8.70 2.07 4.46 <br /> 5/4/2010 8.98 1.79 4.18 <br /> 8/25/2010 8.83 1.94 4.33 <br /> 10/21/2010 5.51 5.26 7.65 <br /> 1/26/2011 6.78 3.99 6.38 <br /> 4/25/2011 5.01 5.76 8.15 <br /> 8/17/2011 7.46 3.31 5.70 <br /> 10/26/2011 7.67 3.10 5.49 <br /> 1/24/2012 6.12 4.65 7.04 <br /> 5/1/2012 9.19 1.58 3.97 <br /> 7/26/2012 9.47 1.30 3.69 <br /> 10/24/2012 8.86 1.91 4.30 <br /> 1/30/2013 9.25 1.52 3.91 <br /> 4/29/2013 7.01 3.76 6.15 <br /> 7/31/2013 9.86 0.91 3.30 <br /> 11/20/2013 9.75 1.02 3.41 <br /> 2/3/2014 9.87 0.90 3.29 <br /> 4/23/2014 8.91 1.86 4.25 <br /> 8/4/2014 8.02 2.75 5.14 <br /> 10/29/2014 9.65 1.12 3.51 <br /> 1/28/2015 9.75 1.02 3.41 <br /> 10/22/2015 9.59 1.18 3.57 <br /> 10/27/2015 9.61 1.16 3.55 <br /> 4/22/2016 9.10 1.67 4.06 <br /> 11/1/2016 9.34 1.43 3.82 <br /> 12/9/2016 9.72 1.05 3.44 <br /> 5/4/2017 4.46 6.31 8.70 <br /> 11/27/2017 9.60 1.17 3.56 <br /> 5/4/2018 9.00 1.77 4.16 <br /> 11/6/2018 9.61 1.16 3.55 <br /> 4/29/2019 7.18 3.59 5.98 <br /> 10/30/2019 9.06 1.71 4.10 <br /> 5/6/2020 9.93 0.84 3.23 <br /> 11/5/2020 9.65 1.12 3.51 <br /> 5/3/2021 8.59 2.18 4.57 <br /> 10/18/2021 10.07 0.70 3.09 <br /> 4/29/2022 9.95 0.82 3.21 <br /> 11/8/2022 9.84 0.93 3.32 <br /> 3/24/2023 5.85 4.92 7.31 <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.htmi) <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 54 of 145 EKI 1390088.03 <br />