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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 /> MWR-10 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 12.71 15.10 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 10/29/2019 14.02 -1.31 1.08 <br /> 4/16/2020 12.50 0.21 2.60 <br /> 11/3/2020 13.82 -1.11 1.28 <br /> 5/5/2021 11.96 0.75 3.14 <br /> 10/20/2021 12.30 0.41 2.80 <br /> 5/10/2022 13.59 -0.88 1.51 <br /> 11/7/2022 11.84 0.87 3.26 <br /> 4/5/2023 9.51 3.20 5.59 <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.htmi) <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 117 of 145 EKI B90088.03 <br />