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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-9 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> �a a, <br /> ai ai 10 <br /> W � <br /> "' <br /> o S c <br /> 3 � <br /> v <br /> 3 0 <br /> o c <br /> c7 M <br /> m -5 <br /> 41 <br /> G/ Ln to r,, oo Ql O -i N rn Ln to r, oo Ol O r-I N m Ln to r, oo cn O r-I N m � Ln <br /> N 01 Ol Ol T T 0 0 0 0 0 0 0 0 0 0 r-I r-I 1- 1- 1- 1- 1- 1- 1- 1- N N N N N N <br /> �-- C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C <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-9 <br /> Measuring Point NGVD 29 NAVD 88 <br /> M P 1 12.07 14.46 <br /> M P 2 12.01 14.40 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 1/10/2005 7.20 4.87 7.26 <br /> 5/4/2005 7.50 4.57 6.96 <br /> 6/16/2005 7.06 5.01 7.40 <br /> 8/26/2005 7.51 4.56 6.95 <br /> 11/4/2005 9.61 2.46 4.85 <br /> 2/16/2006 8.20 3.87 6.26 <br /> 9/4/2013 9.47 2.60 4.99 <br /> 10/13/2015 8.88 3.19 5.58 <br /> 12/7/2016 11.1 0.97 3.36 <br /> 9/18/2017 7.51 4.50 6.89 <br /> 11/29/2017 9.28 2.73 5.12 <br /> 2/28/2018 9.20 2.81 5.20 <br /> 11/6/2018 11.03 0.98 3.37 <br /> 4/30/2019 6.89 5.12 7.51 <br /> 10/30/2019 11.28 0.73 3.12 <br /> 5/11/2020 10.78 1.23 3.62 <br /> 11/6/2020 9.69 2.32 4.71 <br /> 5/5/2021 10.15 1.86 4.25 <br /> 10/18/2021 9.15 2.86 5.25 <br /> 5/3/2022 12.90 -0.89 1.50 <br /> 11/9/2022 12.61 -0.60 1.79 <br /> 4/4/2023 4.10 7.91 10.30 <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 /> EKI Environment &Water, Inc. <br /> July 2023 Page 15 of 145 EKI B9O088.03 <br />