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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 - CLSP-11 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> c� a, <br /> a�i y 10 <br /> W <br /> d 41 <br /> *' 5 <br /> 3 = <br /> a, <br /> 3 0 <br /> o c <br /> c7 0 <br /> -5 <br /> a uO �.o r` oo rn o -1 N m un � r� 00 rn o r-i N m v Ln �.o r` oo rn o N m � un <br /> GJ a) 0) 0) a) M 0 0 0 0 0 0 0 0 0 0 <br /> co co co co co ca co co ro co co co co ca co co co co co ra co co ro co co co co co ca co co <br /> Date <br /> CLSP-11 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MID 9.81 12.2 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 9/14/2017 7.16 2.65 5.04 <br /> 11/29/2017 7.55 2.26 4.65 <br /> 2/28/2018 7.30 2.51 4.90 <br /> 6/15/2018 7.42 2.39 4.78 <br /> 11/6/2018 8.38 1.43 3.82 <br /> 1/25/2019 7.59 2.22 4.61 <br /> 4/30/2019 6.20 3.61 6.00 <br /> 8/2/2019 7.45 2.36 4.75 <br /> 10/30/2019 9.59 0.22 2.61 <br /> 1/27/2020 8.37 1.44 3.83 <br /> 5/11/2020 8.18 1.63 4.02 <br /> 8/5/2020 8.50 1.31 3.70 <br /> 11/5/2020 8.41 1.40 3.79 <br /> 1/29/2021 8.70 1.11 3.50 <br /> 5/5/2021 8.64 1.17 3.56 <br /> 8/4/2021 9.76 0.05 2.44 <br /> 10/18/2021 9.83 -0.02 2.37 <br /> 1/28/2022 9.20 0.61 3.00 <br /> 9/29/2022 9.80 0.01 2.40 <br /> 5/3/2022 8.25 1.56 3.95 <br /> 11/8/2022 9.73 0.08 2.47 <br /> 2/1/2023 7.81 2.00 4.39 <br /> 4/4/2023 6.30 3.51 5.90 <br /> Abbreviations: <br /> CLSP=Central Lathrop Specific Plan <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,August 2017. <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 16 of 145 EKI B90088.03 <br />