Laserfiche WebLink
Appendix B- Historical Water Levels City of Lathrop <br /> Consolidated Treatment Facility <br /> Monitoring and Reporting Program R5-2016-0028-03 Rev 3 <br /> MWM-1 <br /> Measuring Point NGVD 29 NAVD 88 <br /> MP 1 15.18 17.57 <br /> MP 2 11.83 14.22 <br /> Groundwater Groundwater <br /> Date Sampled DTW(ft) Elevation Elevation <br /> ft,NGVD 29 ft,NAVD 88) <br /> 5/3/2021 10.80 1.03 3.42 <br /> 10/18/2021 10.80 1.03 3.42 <br /> 4/29/2022 10.88 0.95 3.34 <br /> 11/8/2022 10.55 1.28 3.67 <br /> 3/24/2023 5.05 6.78 9.17 <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,January 2007 following <br /> modifications to the top of the well casing.Groundwater elevations calculated from depth to groundwater measured before <br /> January 2007 are calculated using MP 1 and after January 2007 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 /> EKI Environment &Water, Inc. <br /> July 2023 Page 19 of 145 EKI B90088.03 <br />