2019-07-24_GENERAL DOCUMENTS - C1981010

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degrees North(or decimal associated calculations are explained as follows and are degrees) available in Table V. The GNSS altitude as measured by minutes North the Bad Elf was converted to feet (measured elevation). seconds North To obtain height above mean sea level for each point, an NOTE:fGr 56 degrees 15 miinutes South,you can enter orthometric height had to be calculated. The the latitude as- a Decimal Degrees in just the first field,e.g.,-56.2 5 orthometric height approximates mean sea level and is c;r the difference between GPS ellipsoid height and geoid b',Degrees Minutes Second's in their respective fields,e.g.. -5,&degrees,15 minutes. height. This was accomplished in a two-step process using the UNAVCO calculator found here: I degrees East(or decimal https://www.unavco.org/software/geodetic- .......................................................I minutes East utilities/geoid-height-calculator/geoid-he ight- seconds East calculator.html I NOTE.,,fir 102 degrees aO milinutes West,yGu can enter Entering the Latitude, Longitude and GPS elevation the the lGrigitude,as: conversion is made by submitting this information. For a)Decimal Degrees in just the first field,e.g.,-10 2.5, an explanation of the geodesy associated with these Gr b)Degrees Minutes SecGnds in their respective fields,e.g., terms please see: -1,02 degrees a,,&minutes. http://www.esri.com/news/arcuser/0703/geoidlof3.html ej 1 1 ig: meters Illustration I (left): Screen capture from the UNA VCO site Reset SUbmit showing the method of converting GPS measurement of elevation to height above mean sea level. Your Input Coordinates and GPS Height-- Latitude = 40.43' N = 40'25'48" N Longitude= 107-54' W= 107' 32' 24" W GP S ellip so idal height=222 7-10 (meter&) Geoid height 14.021 (meters) Orthomeffic height (height above EG-M96 geoi-d which approximates mean &ea level) 224 1.12 1 meters) note- orthornetri-C height=GPS ellipoidal height- geoid height), Illustration 2 (Above): Screen capture from UNA VCO site showing the mathematic relationships between geoid, orthometric and ellipsoid heights. As illustrated in the above methodology,many variables affect the precision of field-collected elevations measured with a handheld GPS unit. The average GPS positional error for the 45 points collected in the field was 6.74 ft. However, as demonstrated by the data collected and illustrated below, the difference in field collected elevation appears generally consistent throughout the site and corroborates TMI's approved post mining topography. Using Microsoft Excel® (Table V), the Division charted the PMT from the ARR (M 1) map elevations, and the on-the-ground measured elevations, converting the field data (GNS S—Alt) to elevation above mean sea level and created cross-sections for each transect and its associated reclamation parcel for comparison. This underlying data for the topographic analysis is presented in Table 11 at the end of this document. The illustrations below show transect locations, field collected points in relationship to the 2016 ARR Map and transect cross sections exhibiting the elevation differences between the TMI map and Permit Number C 198 1010 Prepared by: R.Reilley,MS,GISP SLI 8 Page 10 of 22