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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-11 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 11.94 14.33 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 10/29/2019 11.41 0.53 2.92 <br /> 4/16/2020 11.60 0.34 2.73 <br /> 11/3/2020 10.83 1.11 3.50 <br /> 5/5/2021 11.95 -0.01 2.38 <br /> 10/20/2021 15.70 -3.76 -1.37 <br /> 5/10/2022 17.04 -5.10 -2.71 <br /> 11/7/2022 21.45 -9.51 -7.12 <br /> 4/5/2023 14.51 -2.57 -0.18 <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 /> (c) Open marker represents questionable water level, likely due to dewatering activities in the vicinity of MWR-11. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 119 of 145 EKI B90088.03 <br />