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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- CLSP-8 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai ai 10 <br /> W � <br /> 4J � <br /> S <br /> o c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 M <br /> m -5 <br /> 41 <br /> G/ Ln 1.0 r� 00 M O r-I N M � M l0 r� W M O r-I N M � Ln l0 r� W M O r-I N M � 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 co co co co co co co ro ro ro ro ro ro ro ra ca ca ca ca co co co ca ca ra ra <br /> Date <br /> CLSP-8 <br /> Measuring Point NGVD 29 NAVD 88 <br /> M P 1 12.03 14.42 <br /> MP 2 11.99 14.38 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 1/7/2005 7.47 4.56 6.95 <br /> 5/4/2005 7.63 4.40 6.79 <br /> 6/16/2005 7.59 4.44 6.83 <br /> 8/25/2005 8.94 3.09 5.48 <br /> 11/4/2005 9.39 2.64 5.03 <br /> 2/16/2006 8.63 3.40 5.79 <br /> 8/12/2013 11.74 0.29 2.68 <br /> 5/11/2016 9.85 2.18 4.57 <br /> 12/7/2016 10.99 1.04 3.43 <br /> 9/18/2017 10.22 1.77 4.16 <br /> 11/29/2017 9.92 2.07 4.46 <br /> 2/28/2018 9.05 2.94 5.33 <br /> 11/6/2018 8.95 3.04 5.43 <br /> 4/30/2019 7.35 4.64 7.03 <br /> 10/30/2019 7.35 4.64 7.03 <br /> 5/11/2020 10.96 1.03 3.42 <br /> 11/5/2020 11.02 0.97 3.36 <br /> 5/5/2021 7.23 4.76 7.15 <br /> 10/18/2021 11.78 0.21 2.60 <br /> 5/3/2022 11.10 0.89 3.28 <br /> 11/9/2022 11.96 0.03 2.42 <br /> 4/4/2023 5.55 6.44 8.83 <br /> Abbreviations: <br /> CLSP=Central Lathrop Specific Plan <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 1 elevation reported by ENGEO, Inc.,July 2005. MP 2 elevation surveyed by MacKay&Somps,August 2017.Groundwater <br /> elevations calculated from depth to groundwater measured before August 2017 are calculated using MP 1 and after August 2017 <br /> 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 14 of 145 EKI B90088.03 <br />