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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-1 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> > 10 <br /> W <br /> d � <br /> 5 <br /> a c <br /> 3 � <br /> a, <br /> 3 E 0 <br /> o e <br /> Q <br /> ++ <br /> -5 <br /> a� Ln 1.0 r` oo rn o c14 m v Ln �O r` oo rn o N m � Ln �.O r` oo rn o m � Ln <br /> d M M M M M O O O O O O O O O O N N N N N N <br /> ca co co co co ca ca ca ca co co co co ca ca ca ca co co co co co co co co co co co co co co <br /> Date <br /> CLSP-1 <br /> Measuring Point NGVD 29 NAVD 88 <br /> M P 1 10.89 13.28 <br /> M P 2 10.91 13.30 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 1/7/2005 5.37 5.52 7.91 <br /> 5/4/2005 5.65 5.24 7.63 <br /> 6/16/2005 6.31 4.58 6.97 <br /> 8/25/2005 5.19 5.70 8.09 <br /> 11/4/2005 7.88 3.01 5.40 <br /> 2/16/2006 7.60 3.29 5.68 <br /> 9/4/2013 7.42 3.47 5.86 <br /> 10/13/2015 8.00 2.89 5.28 <br /> 12/7/2016 9.05 1.84 4.23 <br /> 9/18/2017 7.09 3.82 6.21 <br /> 11/29/2017 7.90 3.01 5.40 <br /> 2/28/2018 7.82 3.09 5.48 <br /> 11/6/2018 8.42 2.49 4.88 <br /> 4/30/2019 9.44 1.47 3.86 <br /> 10/30/2019 9.34 1.57 3.96 <br /> 5/11/2020 6.86 4.05 6.44 <br /> 11/6/2020 7.93 2.98 5.37 <br /> 5/5/2021 8.19 2.72 5.11 <br /> 10/18/2021 8.23 2.68 5.07 <br /> 5/3/2022 8.90 2.01 4.40 <br /> 11/9/2022 11.57 -0.66 1.73 <br /> 4/4/2023 3.40 7.51 9.90 <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 12 of 145 EKI B90088.03 <br />