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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-18 <br /> Groundwater Elevation <br /> � <br /> 20 4ell abandoned <br /> 00 <br /> 0 <br /> o z 15 <br /> a�i iv 10 <br /> W <br /> d � <br /> 5 <br /> a c <br /> 3 � <br /> a, <br /> 3 0 <br /> o e <br /> C7 0 <br /> -5 <br /> 47 Lfl lD I� 00 Ql O c-I N M � lf1 1.0 r` 00 Ql O M L.P) lD I" 00 Ql O r-I N M � Lf1 <br /> d 01 41 01 01 01 0 0 0 0 0 0 0 0 0 0 r� r� r� r� r� r� r I r I r I r I N N N N N N <br /> co co co co co co co ro ca ra ra co ca ca co co co co co co co co co co co ro ca co ro ra co <br /> Date <br /> MWM-18 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 1 9.50 11.89 <br /> MP 2 13.36 15.75 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88 <br /> 5/24/2005 7.90 1.60 3.99 <br /> 6/28/2005 7.74 1.76 4.15 <br /> 10/12/2005 11.60 1.76 4.15 <br /> 1/31/2006 11.04 2.32 4.71 <br /> 4/25/2006 9.60 3.76 6.15 <br /> 7/19/2006 10.53 2.83 5.22 <br /> 10/13/2006 13.75 -0.39 2.00 <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,July 2005. MP 2 elevation surveyed by MacKay&Somps,July 2005 following <br /> modifications to the top of the well casing. Groundwater elevations calculated from depth to groundwater measured before <br /> July 2005 are calculated using MP 1 and after July 2005 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.html) <br /> (c)Well was abandoned in December 2006. <br /> EKI Environment &Water, Inc. <br /> July 2023 Page 46 of 145 EKI B90088.03 <br />