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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-9 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> > > 10 <br /> W � <br /> "' <br /> o 5 c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 0 <br /> -5 <br /> G/ u'1 lD I, 00 Ql O c-I N M � 111 l4 I, W Ol O r-I N M � L!1 l0 I, 00 Ol O r-I N M � if 1 <br /> GJ 01 01 01 T T O O O O O O O O O O r- r- r- r- r- 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-9 KMW-9 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 15.82 18.21 MID 15.82 18.21 <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 14.53 1.29 3.68 11/8/2022 12.45 3.37 5.76 <br /> 2/2/2015 12.58 3.24 5.63 4/3/2023 5.05 10.77 13.16 <br /> 4/27/2015 13.07 2.75 5.14 <br /> 7/27/2015 13.61 2.21 4.60 <br /> 8/31/2015 15.61 0.21 2.60 <br /> 10/29/2015 14.76 1.06 3.45 <br /> 2/4/2016 13.25 2.57 4.96 <br /> 4/21/2016 13.00 2.82 5.21 <br /> 11/2/2016 14.71 1.11 3.50 <br /> 8/8/2016 14.81 1.01 3.40 <br /> 12/7/2016 14.41 1.41 3.80 <br /> 1/16/2017 13.36 2.46 4.85 <br /> 5/8/2017 11.00 4.82 7.21 <br /> 9/11/2017 12.80 3.02 5.41 <br /> 11/28/2017 12.52 3.30 5.69 <br /> 11/28/2017 12.51 3.31 5.70 <br /> 4/25/2018 12.24 3.58 5.97 <br /> 5/2/2018 12.32 3.50 5.89 <br /> 5/31/2018 12.86 2.96 5.35 <br /> 11/5/2018 13.45 2.37 4.76 <br /> 5/1/2019 10.62 5.20 7.59 <br /> 10/31/2019 11.40 4.42 6.81 <br /> 5/12/2020 8.49 7.33 9.72 <br /> 11/4/2020 11.06 4.76 7.15 <br /> 5/3/2021 11.55 4.27 6.66 <br /> 10/19/2021 13.06 2.76 5.15 <br /> 5/2/2022 13.30 2.52 4.91 <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 84 of 145 EKI B90088.03 <br />