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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- MWM-7 <br /> Groundwater Elevation <br /> 000 20 <br /> 0 <br /> o z 15 <br /> ai 10 <br /> W <br /> GJ � <br /> 5 <br /> 3 <br /> v <br /> c a) 0 <br /> ,Ln 0 <br /> V <br /> m -5 <br /> 41 u'f lD r� W Ql O N M u'1 lD I� 00 Ql O M � uO lD I� 00 Ql O c-I N M � u'f <br /> co co co co co co co co co co co co co co co M M M M M M M M M co co co co co co co <br /> Date <br /> MWM-7 MWM-7 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 7.86 10.25 MP 7.86 10.25 <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 /> 5/23/2005 8.35 -0.49 1.90 5/4/2018 5.90 1.96 4.35 <br /> 6/28/2005 9.05 -1.19 1.20 4/29/2019 5.17 2.69 5.08 <br /> 10/12/2005 8.91 -1.05 1.34 11/1/2019 6.53 1.33 3.72 <br /> 1/31/2006 8.08 -0.22 2.17 5/6/2020 6.50 1.36 3.75 <br /> 4/25/2006 4.40 3.46 5.85 11/6/2020 6.79 1.07 3.46 <br /> 7/19/2006 6.89 0.97 3.36 5/3/2021 7.00 0.86 3.25 <br /> 10/13/2006 7.49 0.37 2.76 10/21/2021 7.30 0.56 2.95 <br /> 1/23/2007 6.70 1.16 3.55 4/29/2022 7.00 0.86 3.25 <br /> 4/24/2007 6.9 0.96 3.35 11/9/2022 6.91 0.95 3.34 <br /> 7/24/2007 7.28 0.58 2.97 3/24/2023 3.81 4.05 6.44 <br /> 10/30/2007 6.83 1.03 3.42 <br /> 1/24/2008 5.60 2.26 4.65 <br /> 4/15/2008 7.45 0.41 2.80 <br /> 8/25/2008 6.54 1.32 3.71 <br /> 11/17/2008 6.37 1.49 3.88 <br /> 2/17/2009 5.18 2.68 5.07 <br /> 4/15/2009 6.11 1.75 4.14 <br /> 7/27/2009 -- -- -- <br /> 10/19/2009 6.23 1.63 4.02 <br /> 1/25/2010 5.17 2.69 5.08 <br /> 4/21/2010 4.80 3.06 5.45 <br /> 10/13/2015 6.98 0.88 3.27 <br /> 10/27/2015 6.94 0.92 3.31 <br /> 4/22/2016 5.55 2.31 4.70 <br /> 11/1/2016 6.87 0.99 3.38 <br /> 12/9/2016 7.00 0.86 3.25 <br /> 5/4/2017 4.05 3.81 6.20 <br /> 11/27/2017 6.00 1.86 4.25 <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,July 2005. <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 29 of 145 EKI B90088.03 <br />