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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-2 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 1 12.92 15.31 <br /> MP 2 11.18 13.57 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88) <br /> 11/4/2020 9.36 1.82 4.21 <br /> 5/3/2021 9.60 1.58 3.97 <br /> 10/18/2021 9.82 1.36 3.75 <br /> 4/29/2022 9.91 1.27 3.66 <br /> 11/8/2022 9.53 1.65 4.04 <br /> 3/24/2023 3.26 7.92 10.31 <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 1 elevation surveyed by MacKay&Somps,July 2005. MP 2 elevation surveyed by MacKay&Somps,January 2007 following <br /> modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured before <br /> January 2007 are calculated using MP 1 and after January 2007 are calculated using MP 2. <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 21 of 145 EKI B90088.03 <br />