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I I I I I I I .: I '1 I I I I I I I '. I 0021J5 considered to have no resource risk for the purpose of this survey, The focus of this erosion survey is to identifY the areas of erosion that pose a significant resource risk within the FERC project boundary, 202 GPS Data Collection Protocol Equipment The following equipment was used to electronically record location information in the field and to process these data for inclusion in Denver Water's GIS database: . Leica GS 20, handheld, capable of sub-meter accuracy and equipped with the necessary hardware to collect data for use in a post-processing system . GIS DataPro Software, for downloading data to a PC and performing post- processing functions. Field Data ClIllectilln G PS data collected in the field for the erosion survey included point location information (UTM, X and Y coordinate for each point taken with GPS unit), All erosion sites were recorded with the GPS unit as erosion lines (ER02), Each erosion line is made up of numerous nodes designed to accurately depict the specific erosion site, When collecting line data, sufficient nodes were collected to provide an accurate depiction of the particular erosion feature, All data nodes within the erosion lines were collected to sub- meter horizontal accuracy Data Export and Post-Processing All data nodes saved in the memory of the GPS unit were downloaded to a computer via the associated software program installed on the PC (GIS Data Pro). Post-processing was used to correct the accuracy of each node collected with the GPS unit. To post-process the data, the most suitable base-station (Platteville) was accessed through the internet. Post-processed data were provided to our GIS analyst in shape-file format for inclusion into GIS layers. All nodes collected within the erosion lines for this project were accurate to less than I meter after post-processing. Williams Fllrk Reservoir Hydroelectnc Project Janw.ll)' 2004 Stelgers Corporation ErosIOn Survey Repon Page 4