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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 /> KMW-2 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 13.86 16.25 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft NGVD 29 ft NAVD 88 <br /> 12/7/2016 13.13 0.73 3.12 <br /> 5/8/2017 10.77 3.09 5.48 <br /> 11/28/2017 11.98 1.88 4.27 <br /> 11/28/2017 11.95 1.91 4.30 <br /> 5/2/2018 11.45 2.41 4.80 <br /> 11/5/2018 13.04 0.82 3.21 <br /> 5/1/2019 10.95 2.91 5.30 <br /> 10/31/2019 11.95 1.91 4.30 <br /> 5/12/2020 10.42 3.44 5.83 <br /> 11/4/2020 11.89 1.97 4.36 <br /> 5/3/2021 12.00 1.86 4.25 <br /> 10/19/2021 12.71 1.15 3.54 <br /> 5/2/2022 11.65 2.21 4.60 <br /> 11/8/2022 12.31 1.55 3.94 <br /> 4/3/2023 8.50 5.36 7.75 <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, February 2015. <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.htmi) <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 73 of 145 EKI B90088.03 <br />