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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-4 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 1 17.53 19.92 <br /> MP 2 20.83 23.22 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29) ft,NAVD 88 <br /> 8/31/2015 14.45 3.08 5.47 <br /> 10/29/2015 14.65 2.88 5.27 <br /> 2/4/2016 14.80 2.73 5.12 <br /> 4/21/2016 14.40 3.13 5.52 <br /> 8/8/2016 15.23 2.30 4.69 <br /> 12/7/2016 15.85 1.68 4.07 <br /> 5/8/2017 12.68 4.85 7.24 <br /> 11/28/2017 14.35 3.18 5.57 <br /> 4/25/2018 17.00 3.83 6.22 <br /> 5/2/2018 17.02 3.81 6.20 <br /> 5/31/2018 17.31 3.52 5.91 <br /> 11/5/2018 18.32 2.51 4.90 <br /> 5/1/2019 14.46 6.37 8.76 <br /> 10/31/2019 16.75 4.08 6.47 <br /> 5/12/2020 4.74 16.09 18.48 <br /> 11/4/2020 12.86 7.97 10.36 <br /> 5/3/2021 15.35 5.48 7.87 <br /> 10/19/2021 14.07 6.76 9.15 <br /> 5/2/2022 15.30 5.53 7.92 <br /> 11/8/2022 17.80 3.03 5.42 <br /> 4/3/2023 5.65 15.18 17.57 <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, February 2015. MP 2 elevation surveyed by MacKay&Somps, February 2018 <br /> following modifications to the top of the well casing. Groundwater elevations calculated from depth to groundwater measured <br /> before February 2018 are calculated using MP 1 and after February 2018 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.htmi) <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 76 of 145 EKI 1390088.03 <br />