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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-8 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> ai at 10 <br /> W � <br /> 4J � <br /> "' <br /> o 5 c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 0 <br /> 4 <br /> -5 <br /> 1 <br /> G/ Ln 1.0 n 00 M O ri N M I Ln l0 n W M O ri N M I Ln l0 n W M O r-I N M I Ln <br /> OJ 01 Ol Ol T T 0 0 0 0 0 0 0 0 0 0 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- N N N N N N <br /> co co co co co c0 c0 c0 c0 c0 c0 c0 (0 (0 (0 (0 (0 (0 (0 (6 c0 c6 c6 c6 c6 c6 c0 ca ca ra ra <br /> Date <br /> MWM-8 MWM-8 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 1 7.96 10.35 MP 1 7.96 10.35 <br /> MP 2 11.65 14.04 MP 2 11.65 14.04 <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 /> 5/19/2005 8.10 -0.14 2.25 11/5/2018 10.65 1.00 3.39 <br /> 6/28/2005 8.71 -0.75 1.64 4/29/2019 9.37 2.28 4.67 <br /> 10/12/2005 12.41 -0.76 1.63 11/1/2019 10.68 0.97 3.36 <br /> 1/31/2006 8.91 2.74 5.13 5/8/2020 10.73 0.92 3.31 <br /> 4/25/2006 8.61 3.04 5.43 11/3/2020 10.97 0.68 3.07 <br /> 7/19/2006 10.98 0.67 3.06 5/4/2021 10.15 1.50 3.89 <br /> 10/13/2006 11.18 0.47 2.86 10/19/2021 11.37 0.28 2.67 <br /> 1/23/2007 10.58 1.07 3.46 5/4/2022 11.15 0.50 2.89 <br /> 7/24/2007 11.44 0.21 2.60 11/8/2022 10.96 0.69 3.08 <br /> 10/30/2007 10.91 0.74 3.13 3/27/2023 8.10 3.55 5.94 <br /> 1/24/2008 10.00 1.65 4.04 <br /> 4/15/2008 12.37 -0.72 1.67 <br /> 8/25/2008 10.23 1.42 3.81 <br /> 11/17/2008 10.04 1.61 4.00 <br /> 2/17/2009 8.86 2.79 5.18 <br /> 4/13/2009 9.58 2.07 4.46 <br /> 7/27/2009 9.99 1.66 4.05 <br /> 10/19/2009 10.27 1.38 3.77 <br /> 1/25/2010 8.91 2.74 5.13 <br /> 4/21/2010 9.20 2.45 4.84 <br /> 5/11/2016 9.96 1.69 4.08 <br /> 11/18/2016 11.20 0.45 2.84 <br /> 12/9/2016 11.18 0.47 2.86 <br /> 5/5/2017 8.36 3.29 5.68 <br /> 11/27/2017 10.00 1.65 4.04 <br /> 5/4/2018 10.29 1.36 3.75 <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 2 elevation surveyed by MacKay&Somps,July 2005. Groundwater elevations calculated from depth to groundwater <br /> measured before July 2005 are calculated using MP 1 and after July 2005 are calculated using MP 2. <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 30 of 145 EKI B90088.03 <br />