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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 /> RMW-2 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 21.87 24.26 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 5/2/2018 16.71 5.16 7.55 <br /> 11/5/2018 19.42 2.45 4.84 <br /> 5/2/2019 15.58 6.29 8.68 <br /> 10/29/2019 15.87 6.00 8.39 <br /> 5/6/2020 15.08 6.79 9.18 <br /> 11/5/2020 18.20 3.67 6.06 <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 and reported in Kleinfelder(2004) "Groundwater Monitoring Well Installation,Sampling,and Analysis, <br /> Reiter Property, Lathrop, California,"dated 5 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) Per Regional Water Quality Control Board letter dated 3 May 2021, monitoring is no longer required. <br /> EKI Environment&Water, Inc. <br /> July 2023 Page 96 of 145 EKI B9O088.03 <br />