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<br />. <br /> <br />. <br /> <br />. <br /> <br />1.3 <br /> <br />Mapping <br /> <br />1.3.1 Effective Condition <br /> <br />The effective 1994 study and 2001 LOMR utilized base mapping developed by the Arix <br />Corporation of Greeley, Colorado. The base mapping used for the effective study wacs obtained <br />from the COFC (scale 1 "=200', 2-foot contour interval). Arix Corporation developed the aerial <br />photography and topographic mapping in May 1984. As-built information used to support the <br />2001 LOMR was developed by ICON Engineering, Inc. of Englewood, Colorado in February <br />2001. As-built survey information associated with the 2001 LOMR was incorporated into the <br />hydraulic models, but the floodplain mapping changes associated with the 2001 LOMR were <br />conducted on the effective base mapping. Both the effective base mapping and the 2010 I LOMR <br />as-built survey information are referenced to the City of Fort Collins benchmark system, which <br />is based on the National Geodetic Vertical Datum of 1929 (NGVD 1929). <br />Additional topography utilized in the current study was obtained from the COFC. The <br />COFC's 2-foot contour interval topography was generated from 1999 aerial photography data. <br />The 2005 Removal Action LOMR utilized existing and as-built survey information <br />collected by Northern Engineering Services, Inc. of Fort Collins, Colorado on: (a) January 20th, <br />2004; (b) May 20th, 2004; (c) August 4th, 2004; and (d) June 28th, 2005. The CLPR Removal <br />Action mapping was produced at a scale of 1"=40', with a I-foot contour interval that covers the <br />left and right bank area of the Cache la Poudre River between Linden Street and the RN.R.R. <br />The Removal Action Project as-built survey information was referenced to the Ci.ty of Fort <br />Collins benchmark system, which is based on the National Geodetic Vertical Datum of 1929 <br />(NGVD 1929) and referenced to the Colorado State Plane North (NAD 83) horizontal datum. <br /> <br />1.3.2 Existing Condition <br /> <br />King Surveyors, Inc. of Windsor Colorado collected as-built survey information for the <br />existing condition in April 2004 and on February 2, 2006. In April 2004 KSI developed I-foot <br />contour interval topography for the area bounded by: a) the Cache la Poudre River on the west, <br />b) Lincoln Street on the south, c) 1 st Street on the east, and d) LindenlBuckingham Streets on the <br />north.. On February 2, 2006, spot elevation information was collected along: <br /> <br />. <br /> <br />Linden Street from the Cache la Poudre River to the RN.R.R.; <br />Lincoln Avenue from the Cache la Poudre River to Lemay Avenue; <br />3rd Street from Lincoln Avenue north approximately 500 feet; and <br />Lemay Avenue from Lincoln Avenue north approximately 500 feet. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />COFC2003-1O Oxbow FINAL LOMR.doc <br /> <br />1.6 <br /> <br />ANdERSON CONsulTiNG Er~GiNEERS, INC. <br />