DRAFT WILLAMETTE RIVER GREENWAY DESIGN PLAN <br />Table 2.4 Test Site No. 4 <br />GPS Points Collected XX / XLF <br />Satellites Acquired 13 <br />Observations The TOB approximately follows riverside edge of bike path to <br />the north and south of the test site. The extent of the sample <br />site is identifiable by drop in elevation of terrain and evidence <br />of topography shaped by water on landside area of bike path. <br />Woody debris, river cobbles, pits of erosion near trees and dense <br />shrub outcroppings suggests the area is frequently inundated <br />by water. Anecdotal verbal information from a passing neighbor <br />supports the bike path floods regularly at this location. The <br />extent of the flooded area appears to end at the base, or <br />part way up, an embankment of backfill upon which adjacent <br />residential homes have been constructed. <br />Findings Field observations support a finding that the TOB line is closer <br />to the bottom of backfill embankment due to the existence <br />of landforms shaped by presence of water and evidence of <br />frequent flooding. The TOB line appears to be approximately <br />several meters west of the property line of adjacent residential <br />development. Methodology for adjustment to TOB line and, to <br />be consistent with TOB location north and south of sample site, <br />supports adjusting the line to a 6' riverside offset from center of <br />bike path. <br />Table 2.5 Test Site No. 5 <br />GPS Points Collected XX / XLF <br />Satellites Acquired 14 <br />Observations The test site includes the existing boat launch. Due to visible <br />erosion and clear visual evidence of land shaped by riverine <br />systems and the presence of water, field-collected data supports <br />a finding that the mapped TOB line is well defined along the <br />riverside edge of bike path and breaks across the boat launch <br />access where the slope of boat launch changes abruptly. <br />Findings The mapped TOB line and observed TOB in the field closely align <br />with GIS Hillshade data originally used to determine the mapped <br />TOB line. The mapped TOB line is accurate, and no adjustments <br />are Drooosed. <br />M WILLAMETTE RIVER GREENWAY CODE AMENDMENTS I CITY OF EUGENi 41 <br />