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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-3 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai ai 10 <br /> W � <br /> o c <br /> 5 <br /> 3 � <br /> v <br /> c 0 <br /> y o <br /> C7 � <br /> 4 <br /> -5 <br /> 1 <br /> G/ Ln 1.0 r� W M O c I N M � Ln l0 r� W M O ri NM :I- Ln 1.0 � W M O r-I NM � Ln <br /> GJ M M M M M C 0 0 0 0 0 C 0 0 0 -1 c I -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 ca ca ca ca co co co ca ca ra ra <br /> Date <br /> CLSP-3 <br /> Measuring Point NGVD 29 NAVD 88 <br /> M P 1 12.68 15.07 <br /> MP 2 12.36 14.75 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 1/10/2005 9.37 3.31 5.70 <br /> 5/3/2005 8.56 4.12 6.51 <br /> 6/16/2005 7.66 5.02 7.41 <br /> 8/26/2005 9.73 2.95 5.34 <br /> 11/4/2005 10.21 2.47 4.86 <br /> 2/16/2006 8.46 4.22 6.61 <br /> 8/12/2013 10.92 1.76 4.15 <br /> 9/29/2015 10.16 2.52 4.91 <br /> 12/7/2016 11.07 1.61 4.00 <br /> 9/14/2017 9.41 2.95 5.34 <br /> 11/29/2017 10.58 1.78 4.17 <br /> 2/28/2018 10.28 2.08 4.47 <br /> 11/6/2018 10.20 2.16 4.55 <br /> 4/30/2019 7.18 5.18 7.57 <br /> 10/30/2019 9.72 2.64 5.03 <br /> 5/11/2020 10.28 2.08 4.47 <br /> 11/6/2020 10.80 1.56 3.95 <br /> 5/5/2021 10.70 1.66 4.05 <br /> 10/18/2021 18.78 -6.42 -4.03 <br /> 5/3/2022 10.85 1.51 3.90 <br /> 11/9/2022 10.84 1.52 3.91 <br /> 4/4/2023 2.85 9.51 11.90 <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 1 elevation reported by ENGEO, Inc.,July 2005. MP 2 elevation surveyed by MacKay&Somps,August 2017.Groundwater <br /> elevations calculated from depth to groundwater measured before August 2017 are calculated using MP 1 and after August 2017 <br /> 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 /> (c)Open marker represents questionable water level measurement, likely affected by dewatering activities in the vicinity of CLSP-3. <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 13 of 145 EKI B90088.03 <br />