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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 /> MWM-13 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 10.74 13.13 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> (ft,NGVD 29) (ft,NAVD 88) <br /> 11/8/2022 9.66 1.08 3.47 <br /> 3/27/2023 6.40 4.34 6.73 <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 by MacKay&Somps,July 2005. <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 39 of 145 EKI 139O088.03 <br />