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Cotter Corporation (N.S.L.)
Cañon City Milling Facility
Cañon City, Colorado
Procedure
Field Global Positioning
System Surveying
Number: SOP-E-140
Page: 7 of 7
Revision: 1
Date: May 2016
9.13 Save current survey file on FC-200 data collector to the storage card by following
menu options on screen. Note if a lot of measurements are being collected it is
recommended to save the current working file more often.
9.14 Turn off FC-200 Data collector.
9.15 Turn off both receivers.
9.16 Place data collector and receivers in to transport case and return to office.
9.17 At the office, measurements recorded on the data collector can be viewed
manually by following the menu prompts on the screen or can be downloaded via
computer using the TopCon 3D software program.
10.0 ACCURACY STANDARDS
10.1 Horizontal positional accuracy should be Tier 1 as identified in CIO 2131. This is
equivalent to an accuracy of less than 1 meter.
10.2 To the extent practicable, horizontal accuracy should be 0.05 feet horizontal and
vertical.
10.3 Monitoring well top of casing and ground surface elevation measurements should
have a vertical positional accuracy of 0.01 feet. This higher level of accuracy is
necessary for hydrologic and hydrogeologic studies. If the global positioning
system surveying cannot provide this accuracy, other traditional land surveying
may be necessary.
11.0 METADATA
11.1 Information on how GPS data were collected needs to be documented in the
resulting geospatial layers metadata record. At a minimum, the following details
should be documented in the metadata:
11.1.1 Maximum PDOP. (using 4 satellites)
11.1.2 Coordinate datum.
11.1.3 Coordinate projection.
11.1.4 Projection Zone, if using UTMs or State Plane.
11.1.5 Description of data point. (sample or well id, or location description)
12.0 RECORDS
12.1 Field sampling logbook, field data sheet, or tablet.