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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-10 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> 10 <br /> W <br /> d � <br /> 5 <br /> a c <br /> 3 � <br /> a, <br /> 3 0 <br /> o e <br /> C7 0 <br /> -5 <br /> a� Lr) 1.0 r` oo rn o r-i c14 m v U) �.O r` oo rn o -1 N m � Ln �.O r` oo rn o m � Ln <br /> d 01 01 01 01 M O O O O O O O O O O N N N N N N <br /> ca co co co co ca ca ca ca co co co co ca ca ca ca co co co co co co co co co co co co co co <br /> Date <br /> KMW-10 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 1 14.66 17.05 <br /> M P 2 9.08 11.47 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 12/15/2015 13.90 0.76 3.15 <br /> 2/4/2016 12.85 1.81 4.20 <br /> 4/21/2016 13.40 1.26 3.65 <br /> 11/2/2016 14.08 0.58 2.97 <br /> 8/8/2016 13.96 0.70 3.09 <br /> 12/7/2016 13.83 0.83 3.22 <br /> 1/16/2017 13.17 1.49 3.88 <br /> 5/8/2017 11.51 3.15 5.54 <br /> 9/11/2017 7.35 1.73 4.12 <br /> 11/28/2017 6.86 2.22 4.61 <br /> 11/28/2017 6.98 2.10 4.49 <br /> 5/2/2018 6.45 2.63 5.02 <br /> 11/7/2018 8.10 0.98 3.37 <br /> 5/2/2019 6.05 3.03 5.42 <br /> 10/31/2019 6.71 2.37 4.76 <br /> 5/12/2020 5.36 3.72 6.11 <br /> 11/4/2020 6.92 2.16 4.55 <br /> 5/3/2021 6.98 2.10 4.49 <br /> 10/19/2021 7.76 1.32 3.71 <br /> 5/2/2022 6.55 2.53 4.92 <br /> 11/9/2022 7.39 1.69 4.08 <br /> 4/3/2023 3.50 5.58 7.97 <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 85 of 145 EKI B90088.03 <br />