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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- MBRMW-4 <br /> Groundwater Elevation <br /> 00 20 <br /> 00 <br /> o z 15 <br /> > 10 <br /> W <br /> d � <br /> a c <br /> 3 � <br /> a, <br /> 3 0 <br /> o e <br /> C7 0 <br /> -5 <br /> a� Lf1 1.0 r-. oo rn o r-I N m y u1 �.O r� 00 rn o r-I N m � u1 �.o r� oo rn o .-I N m � u1 <br /> d T 01 01 01 01 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 /> MBRMW-4 MBRMW-4 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MID 17.75 20.14 MID 17.75 20.14 <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 /> 10/3/2005 15.69 2.06 4.45 7/31/2012 13.71 4.04 6.43 <br /> 1/3/2006 15.35 2.40 4.79 10/30/2012 14.70 3.05 5.44 <br /> 2/10/2006 15.01 2.74 5.13 2/1/2013 14.01 3.74 6.13 <br /> 4/25/2006 14.25 3.50 5.89 5/3/2013 13.03 4.72 7.11 <br /> 7/19/2006 14.00 3.75 6.14 8/6/2013 13.94 3.81 6.20 <br /> 10/13/2006 13.71 4.04 6.43 11/22/2013 15.91 1.84 4.23 <br /> 1/23/2007 13.74 4.01 6.40 2/7/2014 15.36 2.39 4.78 <br /> 4/24/2007 13.73 4.02 6.41 4/25/2014 15.11 2.64 5.03 <br /> 7/24/2007 13.9 3.85 6.24 8/1/2014 14.59 3.16 5.55 <br /> 10/30/2007 14.23 3.52 5.91 11/5/2014 15.48 2.27 4.66 <br /> 1/24/2008 13.78 3.97 6.36 2/3/2015 14.81 2.94 5.33 <br /> 4/15/2008 13.28 4.47 6.86 4/27/2015 14.68 3.07 5.46 <br /> 8/22/2008 14.20 3.55 5.94 10/21/2015 15.53 2.22 4.61 <br /> 11/19/2008 14.48 3.27 5.66 10/28/2015 15.59 2.16 4.55 <br /> 2/9/2009 14.21 3.54 5.93 4/25/2016 14.65 3.10 5.49 <br /> 4/16/2009 13.80 3.95 6.34 8/8/2016 15.40 2.35 4.74 <br /> 7/27/2009 14.05 3.70 6.09 12/7/2016 15.81 1.94 4.33 <br /> 10/19/2009 13.90 3.85 6.24 5/9/2017 13.32 4.43 6.82 <br /> 1/25/2010 14.03 3.72 6.11 11/28/2017 14.68 3.07 5.46 <br /> 4/21/2010 12.93 4.82 7.21 11/28/2017 14.65 3.10 5.49 <br /> 8/23/2010 13.64 4.11 6.50 5/3/2018 14.02 3.73 6.12 <br /> 10/27/2010 13.84 3.91 6.30 5/31/2018 14.33 3.42 5.81 <br /> 1/19/2011 13.12 4.63 7.02 11/5/2018 15.35 2.40 4.79 <br /> 4/19/2011 12.69 5.06 7.45 5/1/2019 12.99 4.76 7.15 <br /> 8/16/2011 12.84 4.91 7.30 10/31/2019 14.04 3.71 6.10 <br /> 11/1/2011 13.15 4.60 6.99 5/8/2020 11.03 6.72 9.11 <br /> 1/25/2012 13.37 4.38 6.77 11/4/2020 12.87 4.88 7.27 <br /> 4/25/2012 13.05 4.70 7.09 5/7/2021 13.45 4.30 6.69 <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 69 of 145 EKI B90088.03 <br />