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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-8 <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 /> ++ <br /> -5 <br /> a� Ln 1.0 r-. oo rn o c14 m v Ln �O r� oo rn o N m � Ln �.o r*1 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-8 KMW-8 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MID 17.98 20.37 MP 17.98 20.37 <br /> Groundwater Groundwater Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 ft,NGVD 29 ft,NAVD 88 <br /> 11/18/2014 16.72 1.26 3.65 11/8/2022 15.36 2.62 5.01 <br /> 2/2/2015 15.45 2.53 4.92 4/3/2023 6.30 11.68 14.07 <br /> 4/27/2015 15.40 2.58 4.97 <br /> 7/27/2015 15.81 2.17 4.56 <br /> 8/31/2015 16.40 1.58 3.97 <br /> 10/29/2015 16.65 1.33 3.72 <br /> 11/6/2015 17.15 0.83 3.22 <br /> 2/4/2016 15.70 2.28 4.67 <br /> 4/21/2016 15.25 2.73 5.12 <br /> 11/2/2016 17.05 0.93 3.32 <br /> 8/8/2016 16.53 1.45 3.84 <br /> 12/7/2016 16.82 1.16 3.55 <br /> 1/16/2017 16.15 1.83 4.22 <br /> 5/8/2017 13.81 4.17 6.56 <br /> 9/11/2017 15.19 2.79 5.18 <br /> 11/28/2017 15.32 2.66 5.05 <br /> 11/28/2017 15.35 2.63 5.02 <br /> 4/25/2018 14.60 3.38 5.77 <br /> 5/2/2018 14.70 3.28 5.67 <br /> 5/31/2018 15.06 2.92 5.31 <br /> 11/5/2018 16.65 1.33 3.72 <br /> 5/1/2019 13.21 4.77 7.16 <br /> 10/31/2019 14.48 3.50 5.89 <br /> 5/12/2020 7.76 10.22 12.61 <br /> 11/4/2020 12.56 5.42 7.81 <br /> 5/3/2021 13.82 4.16 6.55 <br /> 10/19/2021 13.81 4.17 6.56 <br /> 5/2/2022 13.30 4.68 7.07 <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.html) <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 82 of 145 EKI B90088.03 <br />