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WILLDAN ASSOCIATES" 'N(�;� <br />Proressicnc CcrsuiFirg -JerviC as �ince 1964 <br />October 3, 1989 <br />Mr. Mark Durham <br />U.S. Army Corps of Engineers <br />Regulatory Branch <br />P. D. Box 2711 <br />Los Angeles, CA 90053 <br />Subject: Section 404 Considerations for Modifications <br />to Bristol Street Bridge at Santiago Creek <br />Dear Mr. Durham: <br />Pursuant to my telephone conversation with Mr. Chuck Holt, Chief of the <br />Regulatory Branch, this letter is sent to obtain a determination concerning <br />the Section 404 permit requirements, if any, that are applicable to the <br />above- referenced project. <br />The proposed modifications to the Bristol Street Bridge, at Santiago <br />Creek, would involve widening the existing bridge structure from 53' to <br />approximately 10(1' wide over the total bridge length of 97'. This bridge <br />modification would occur as Phase 2 of a proposed three -phase effort to <br />widen Bristol Street, from Memory Lane to Warner Avenue, to achieve a <br />six -lane arterial roadway throughout this entire segment of Bristol Street <br />(see enclosed map). No specific engineering has yet been prepared con- <br />cerning the design and construction of the widened bridge structure. <br />Based upon a preliminary evaluation of the live load carrying rapacity of <br />the existing bridge structure, it appears that the existing bridge will not <br />have to be rebuilt as part of the total bridge widening effort. An addi- <br />tional bridge span, adjacent to the existing bridge, is presently contem- <br />plated as the probable means of widening the bridge. This would be <br />accomplished by either a single -span or double -span bridge structure; <br />neither bridge design would require any fill within Santiago Creek. A <br />single -span bridge would be supported by abutments located atop the <br />creek banks on either side of the creek. A double -span bridge would <br />include a central pier support, within the creek bottom, in addition to the <br />two abutments atop Both sides of the creek. The central support would be <br />sunk deep below the level of the creek bottom and would require no fill. <br />Any minor reduction in the creek capacity resulting from the expansion to <br />the bridge would be replaced by either raising the level of the bridge or <br />by widening the sides of the creek. <br />IX-13 <br />MY rei n <br />