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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-1 <br /> Groundwater Elevation <br /> 000 20 <br /> 0 <br /> o z 15 <br /> ai iv 10 <br /> W <br /> GJ � <br /> 5 <br /> 3 � <br /> v <br /> 0 W 0 <br /> o > <br /> o <br /> M <br /> m -5 <br /> W Ln l0 r` 00 M O r-I N M � LO lD r, 00 M O r-I N CO � uO lD r, 00 G) O c-I N M � Ln <br /> GJ G1 G1 G1 T T O O O O O O O O O O 1- 1- 1- 1- 1- 1- 1- 1- <br /> co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co co <br /> Date <br /> W-1 W-1 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 13.36 15.75 MP 13.36 15.75 <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 13.00 0.36 2.75 Oct-97 16.54 -3.18 -0.79 <br /> Apr-95 12.60 0.76 3.15 Nov-97 15.10 -1.74 0.65 <br /> May-95 12.80 0.56 2.95 Dec-97 14.55 -1.19 1.20 <br /> Jun-95 13.70 -0.34 2.05 Jan-98 13.70 -0.34 2.05 <br /> Jul-95 14.10 -0.74 1.65 Feb-98 12.10 1.26 3.65 <br /> Sep-95 15.00 -1.64 0.75 Mar-98 10.30 3.06 5.45 <br /> Oct-95 15.00 -1.64 0.75 Apr-98 10.40 2.96 5.35 <br /> Nov-95 15.00 -1.64 0.75 May-98 10.60 2.76 5.15 <br /> Dec-95 15.2 -1.84 0.55 Jun-98 12.02 1.34 3.73 <br /> Jan-96 13.10 0.26 2.65 Jul-98 13.20 0.16 2.55 <br /> Feb-96 13.10 0.26 2.65 Aug-98 13.92 -0.56 1.83 <br /> Apr-96 11.90 1.46 3.85 Sep-98 13.72 -0.36 2.03 <br /> May-96 12.94 0.42 2.81 Oct-98 13.65 -0.29 2.10 <br /> Jun-96 13.70 -0.34 2.05 Nov-98 12.97 0.39 2.78 <br /> Jul-96 15.10 -1.74 0.65 Dec-98 12.70 0.66 3.05 <br /> Sep-96 15.20 -1.84 0.55 Jan-99 12.63 0.73 3.12 <br /> Oct-96 14.40 -1.04 1.35 Feb-99 11.83 1.53 3.92 <br /> Nov-96 14.20 -0.84 1.55 Mar-99 11.93 1.43 3.82 <br /> Dec-96 13.80 -0.44 1.95 Apr-99 12.31 1.05 3.44 <br /> Jan-97 12.32 1.04 3.43 May-99 12.17 1.19 3.58 <br /> Feb-97 10.91 2.45 4.84 Jun-99 13.50 -0.14 2.25 <br /> Mar-97 11.48 1.88 4.27 Jul-99 14.30 -0.94 1.45 <br /> Apr-97 12.28 1.08 3.47 Aug-99 15.75 -2.39 0.00 <br /> May-97 13.52 -0.16 2.23 Sep-99 15.75 -2.39 0.00 <br /> Jun-97 14.17 -0.81 1.58 Oct-99 14.83 -1.47 0.92 <br /> Jul-97 15.82 -2.46 -0.07 Nov-99 15.00 -1.64 0.75 <br /> Aug-97 15.82 -2.46 -0.07 Dec-99 13.83 -0.47 1.92 <br /> Sep-97 15.15 -1.79 0.60 Jan-00 13.67 -0.31 2.08 <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 87 of 145 EKI B90088.03 <br />