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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 /> City of Lathrop- KMW-11 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> ai 10 <br /> W � <br /> S <br /> o c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 0 <br /> 4 <br /> -5 <br /> 1 <br /> G/ Ln 1.0 n W M O r-I N M I Ln l0 n W M O ri N M I Ln 1.0 n W M O r-I N M I Ln <br /> GJ Ol Ol Ol T T 0 0 0 0 0 0 0 0 0 0 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- N N N N N N <br /> co co co co co co co co co co co co ro ro ro ro ro ro ro ra co ca ca ca co co co ca ca ra ra <br /> Date <br /> KMW-11 <br /> Measuring Point NGVD 29 NAVD 88 <br /> M P 1 15.01 17.4 <br /> MP 2 8.72 11.11 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 12/15/2015 14.12 0.89 3.28 <br /> 2/4/2016 13.20 1.81 4.20 <br /> 4/21/2016 13.80 1.21 3.60 <br /> 11/2/2016 14.31 0.70 3.09 <br /> 8/8/2016 14.28 0.73 3.12 <br /> 12/7/2016 14.14 0.87 3.26 <br /> 1/16/2017 13.37 1.64 4.03 <br /> 5/8/2017 11.98 3.03 5.42 <br /> 9/11/2017 7.10 1.62 4.01 <br /> 11/28/2017 6.55 2.17 4.56 <br /> 5/2/2018 6.25 2.47 4.86 <br /> 11/7/2018 7.82 0.90 3.29 <br /> 5/2/2019 6.62 2.10 4.49 <br /> 10/31/2019 6.57 2.15 4.54 <br /> 5/12/2020 5.74 2.98 5.37 <br /> 11/4/2020 6.71 2.01 4.40 <br /> 5/3/2021 7.22 1.50 3.89 <br /> 10/19/2021 7.61 1.11 3.50 <br /> 5/2/2022 6.73 1.99 4.38 <br /> 11/9/2022 7.31 1.41 3.80 <br /> 4/3/2023 3.90 4.82 7.21 <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, December 2015. MP 2 elevation surveyed by MacKay&Somps,June 2017 <br /> following modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured <br /> before June 2017 are calculated using MP 1 and after June 2017 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 86 of 145 EKI B90088.03 <br />