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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Simons, Li and Associates, Inc. <br />Job Number 6143J002 <br />Project Portland Flume Reconstruction <br /> <br />It is our understanding that the proposed reconstruction will con- <br />sist of widening and deepening the existing flume with some minor <br />realignments in several areas, The new channel will be concrete <br />lined with a V-shaped bottom and vertical sides, No information <br />was available as to the type of roadway crossings to be placed <br />along the alignment, but it is assumed that concrete box culverts <br />will be used. It is anticipated that the flow line along the <br />alignment will be lowered 4 to 5 feet. <br /> <br />The existing Portland Flume runs generally east to west between <br />6th Avenue and the Uncompahgre River at an average slope of <br />approximately 10 percent near the southern end of Ouray, Colo- <br />rado. The flume channels runoff from Portland Creek through the <br />developed area of town. The total length of the portion of the <br />flume being studied is approximately 2400 feet and extends from <br />300 feet east of Sixth Street to the Uncompahgre River, The <br />existing flume is a concrete lined box section an average of 10 <br />feet wide and three feet deep, The concrete is in generally poor <br />condition with numerous distressed areas, The existing flume has <br />eight roadway crossings and runs adjacent to several existing <br />structures. More detailed descriptions of structures which may be <br />adversely affected by the proposed construction are included here- <br />inafter. <br /> <br />@ <br /> <br /> <br />Six test pits were excavated at the locations shown on the accom- <br />panying site plan with a Case 580C backhoe, Locations were selec- <br />ted by the client and city personnel, Access for exploration was <br />limited in some areas, particularly between 2nd and 4th Streets, <br />due to previous development, During test pit excavation, subsoils <br />were visually examined and sampled at selected intervals, Mater- <br />ials encountered in all of the test pits consisted primarily of <br />varying percentages of silty sand, gravel, cobbles and boulders of <br />medium to high density, Bedrock was encountered only in Test Pit <br /> <br />-2- <br /> <br />