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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 -W-2 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> > 10 <br /> W <br /> d � <br /> a c <br /> 3 4) <br /> a, <br /> 3 0 <br /> O 0 <br /> C9 0 <br /> ++ <br /> -5 <br /> a� Ln �.O r, oo rn or-i N m v Ln �.O r, oo rn or-1 N m :t Ln �O r, oo rn or-1 N m �t Ln <br /> d 01 01 01 T T O O O O O O O O O O <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 /> W-2 W-2 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MID 13.83 16.22 MID 13.83 16.22 <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 /> Feb-95 12.50 1.33 3.72 Oct-97 16.46 -2.63 -0.24 <br /> Apr-95 12.00 1.83 4.22 Nov-97 15.50 -1.67 0.72 <br /> May-95 12.20 1.63 4.02 Dec-97 14.95 -1.12 1.27 <br /> Jun-95 12.30 1.53 3.92 Jan-98 13.65 0.18 2.57 <br /> Jul-95 14.30 -0.47 1.92 Feb-98 12.40 1.43 3.82 <br /> Sep-95 15.00 -1.17 1.22 Mar-98 8.61 5.22 7.61 <br /> Oct-95 14.20 -0.37 2.02 Apr-98 7.55 6.28 8.67 <br /> Nov-95 14.20 -0.37 2.02 May-98 8.40 5.43 7.82 <br /> Dec-95 14.4 -0.57 1.82 Jun-98 10.52 3.31 5.70 <br /> Jan-96 12.60 1.23 3.62 Jul-98 12.51 1.32 3.71 <br /> Feb-96 12.60 1.23 3.62 Aug-98 13.36 0.47 2.86 <br /> Apr-96 11.40 2.43 4.82 Sep-98 13.20 0.63 3.02 <br /> May-96 12.65 1.18 3.57 Oct-98 12.30 1.53 3.92 <br /> Jun-96 13.10 0.73 3.12 Nov-98 12.01 1.82 4.21 <br /> Jul-96 13.90 -0.07 2.32 Dec-98 11.36 2.47 4.86 <br /> Sep-96 14.90 -1.07 1.32 Jan-99 10.90 2.93 5.32 <br /> Oct-96 14.80 -0.97 1.42 Feb-99 9.77 4.06 6.45 <br /> Nov-96 14.50 -0.67 1.72 Mar-99 10.27 3.56 5.95 <br /> Dec-96 14.10 -0.27 2.12 Apr-99 10.40 3.43 5.82 <br /> Jan-97 12.66 1.17 3.56 May-99 13.25 0.58 2.97 <br /> Feb-97 10.64 3.19 5.58 Jun-99 12.00 1.83 4.22 <br /> Mar-97 11.46 2.37 4.76 Jul-99 13.80 0.03 2.42 <br /> Apr-97 12.20 1.63 4.02 Aug-99 14.50 -0.67 1.72 <br /> May-97 13.40 0.43 2.82 Sep-99 14.50 -0.67 1.72 <br /> Jun-97 13.92 -0.09 2.30 Oct-99 14.00 -0.17 2.22 <br /> Jul-97 14.93 -1.10 1.29 Nov-99 14.80 -0.97 1.42 <br /> Aug-97 14.93 -1.10 1.29 Dec-99 12.50 1.33 3.72 <br /> Sep-97 15.40 -1.57 0.82 Jan-00 12.17 1.66 4.05 <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 89 of 145 EKI B90088.03 <br />