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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 /> M W R-4 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 16.43 18.82 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 10/29/2019 13.59 2.84 5.23 <br /> 4/16/2020 14.40 2.03 4.42 <br /> 11/3/2020 14.28 2.15 4.54 <br /> 5/5/2021 14.13 2.30 4.69 <br /> 10/20/2021 13.16 3.27 5.66 <br /> 5/10/2022 13.25 3.18 5.57 <br /> 11/7/2022 12.49 3.94 6.33 <br /> 4/5/2023 9.04 7.39 9.78 <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 in April/May 2004. <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 /> EKI Environment &Water, Inc. <br /> July 2023 Page 108 of 145 EKI B90088.03 <br />