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Global Stab+l~ty Analysts and Impact Assessment for Existing Manmade Structures Tenacon <br />Bayshoro Devolopment -Weld County, Colorado <br />Tenacon Project No. 25045300 <br />analyses. The parameters were obtained/correlated from the tes!ing performed along the <br />slurry wall al+gnment from the previously referenced geotechnical study for the pro)ect <br />Material Type ' "`°' ~~~ ~"y~ ~~ Effectwe Friction Angle <br />120 3z ro <br />110 20 250 <br />95 -- 15 25 <br />135 - ~ -- 42 - - p -- <br />Three scenarios were selected for analysis. The first scenario analyzed the stability of the <br />upstream lake embankment (lake side) during normal water level, static conditions The <br />second scenario analyzed the stabddy of the downstream lake embankment (St Vrem River <br />side) during normal water level IstaLC saturated conddlons) The third scenario analyzed <br />the stability of the upstream lake embankment (lake side) during rapid lake dravvdown wdh a <br />full ccccl~on of the St Vrain River aga+nst the lake embankment on the St Vrain side <br />is~n, + ~~~~ , ar embankmert breach during the 100-year storm event). <br />For the third scenar+o, further analysis was needed to assure that the embankment was <br />stable from an erosion standpoint (along the St Vrain R+ver side) during the 100•year storm <br />event As previously outlined. stream flow velocities were prov+ded by C8L along the St <br />Vrain River channel at various locations for the 100-year storm event Based on the <br />max+mum velocity of the stream channel of about 7-112 feet per second, prov+ded by C&L, d <br />was determined that the St Vrain River side of the lake embankment will require a face <br />protect+on cons+sting of 12' diameter rip rap extending from the tce of the slope to the crest <br />of ;he stops Furthermore, the slope should be constructed to a maximum slope inG+nation <br />of 2-112 to 1 (Horizontal Vertical) in order to provide a stable configuration for rip rap <br />placement and overall global stability S+nce the rip rap erosion protecbon will be regwred, <br />the faung was considered m the global stability analyses, <br />