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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-12 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 12.39 14.78 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 10/29/2019 13.73 -1.34 1.05 <br /> 4/16/2020 13.40 -1.01 1.38 <br /> 11/3/2020 13.37 -0.98 1.41 <br /> 5/5/2021 12.65 -0.26 2.13 <br /> 10/20/2021 Dry Dry Dry <br /> 5/10/2022 Dry Dry Dry <br /> 11/8/2022 Dry Dry Dry <br /> 4/5/2023 Dry Dry Dry <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) MWR-12 was dry on 10/20/2021, 5/10/2022,and 11/8/2022 likely due to dewatering activities in the vicinity. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 121 of 145 EKI B9O088.03 <br />