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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 - KMW-4 <br /> Groundwater Elevation <br /> 000 20 <br /> 0 <br /> > <br /> o z 15 <br /> ai iv 10 <br /> W � <br /> GJ � <br /> 5 <br /> 3 � <br /> v <br /> 0 <br /> c7o c <br /> u0 <br /> m -5 <br /> W Ln lD r, 00 M O r-I N M � LO lD r, 00 M O r-I N CO � uO lD r, W M O c-I N M � Ln <br /> GJ 01 01 01 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 /> KMW-4 KMW-4 <br /> Measuring Point NGVD 29 NAVD 88 Measuring Point NGVD 29 NAVD 88 <br /> MP 1 17.53 19.92 MP 1 17.53 19.92 <br /> MP 2 20.83 23.22 MP 2 20.83 23.22 <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 /> 1/30/2001 13.51 4.02 6.41 4/20/2009 13.45 4.08 6.47 <br /> 10/11/2002 13.67 3.86 6.25 7/27/2009 13.16 4.37 6.76 <br /> 1/24/2003 13.58 3.95 6.34 10/26/2009 12.74 4.79 7.18 <br /> 4/16/2003 14.25 3.28 5.67 2/4/2010 12.98 4.55 6.94 <br /> 9/24/2003 14.32 3.21 5.60 5/3/2010 11.94 5.59 7.98 <br /> 3/3/2004 14.10 3.43 5.82 8/3/2010 11.80 5.73 8.12 <br /> 4/19/2004 13.82 3.71 6.10 10/14/2010 11.90 5.63 8.02 <br /> 7/21/2004 13.04 4.49 6.88 3/3/2011 12.03 5.50 7.89 <br /> 12/1/2004 10.05 7.48 9.87 4/20/2011 9.61 7.92 10.31 <br /> 1/25/2005 13.95 3.58 5.97 8/22/2011 10.55 6.98 9.37 <br /> 4/21/2005 14.07 3.46 5.85 10/31/2011 11.00 6.53 8.92 <br /> 8/18/2005 12.62 4.91 7.30 1/23/2012 11.70 5.83 8.22 <br /> 10/12/2005 12.91 4.62 7.01 4/26/2012 13.50 4.03 6.42 <br /> 1/26/2006 13.17 4.36 6.75 8/1/2012 12.66 4.87 7.26 <br /> 5/1/2006 12.82 4.71 7.10 10/29/2012 14.06 3.47 5.86 <br /> 8/15/2006 10.70 6.83 9.22 2/4/2013 13.46 4.07 6.46 <br /> 10/23/2006 11.05 6.48 8.87 5/6/2013 10.86 6.67 9.06 <br /> 1/30/2007 12.53 5.00 7.39 8/5/2013 12.85 4.68 7.07 <br /> 4/30/2007 12.09 5.44 7.83 11/19/2013 14.61 2.92 5.31 <br /> 8/2/2007 11.82 5.71 8.10 2/6/2014 14.97 2.56 4.95 <br /> 12/3/2007 13.14 4.39 6.78 4/28/2014 13.92 3.61 6.00 <br /> 2/18/2008 12.42 5.11 7.50 8/6/2014 13.81 3.72 6.11 <br /> 4/16/2008 11.72 5.81 8.20 11/4/2014 15.00 2.53 4.92 <br /> 7/15/2008 12.25 5.28 7.67 2/2/2015 13.37 4.16 6.55 <br /> 10/20/2008 12.94 4.59 6.98 4/27/2015 14.45 3.08 5.47 <br /> 1/12/2009 13.49 4.04 6.43 7/27/2015 14.26 3.27 5.66 <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 1 elevation surveyed by MacKay&Somps, February 2015. MP 2 elevation surveyed by MacKay&Somps, February 2018 <br /> following modifications to the top of the well casing. Groundwater elevations calculated from depth to groundwater measured <br /> before February 2018 are calculated using MP 1 and after February 2018 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.htmi) <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 75 of 145 EKI B90088.03 <br />