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BridgelStructures • Roadway/Civil - Specifications, Permitting & Utilities <br />SurveylGeomatics Construction Engineering Management <br />City of Eugene Contract #2010-00223 <br />Exhibit B - Scope of Work <br />GUASUl1lf1G <br />ri ra - _ <br />f fl 6 ! fl <br />November 10, 2009 <br />Mr. Patrick Cox <br />City of Eugene Public Works Department <br />101 East Broadway, Suite 400 <br />Eugene, OR 97401 <br />RE: Eugene Airport Overlay Runway 16L/34R Utility Vault Covers <br />OBEC Proposal No. W089-87 <br />Dear Patrick: <br />OBEC Consulting Engineers Is pleased to present this proposal for engineering services to the City of <br />Eugene for the design of utility vault covers at the Eugene Airport. The following is our understanding <br />of the scope of work for the vault covers that the City requires at this time. <br />Project Understanding <br />The City is nearing 60-percent plans for the overlay of runway 16L/34R. The overlay will require the <br />adjustment of approximately 50 vaults/manhole covers that can be generally grouped in five (5) <br />types as follows: <br />Location Type <br />Vault <br />Cover and Frame <br />Number <br />Runway Shoulder 1 <br />24" <br />pipe barrel <br />12" diameter - Solid <br />28 <br />li <br />Taxiway <br />24"' <br />pipe barren <br />12" diameter - Solid <br />2 <br />_ <br />Runway Shoulder 111 <br />24" <br />pipe barrel <br />24" diameter - Solid <br />16 <br />Taxiway VI <br />48" <br />pipe barrel <br />24" diameter - Solid <br />2 <br />Runway Shoulder V <br />24" <br />pipe barrel <br />24" diameter - Slotted <br />2 <br />The vault/manhole covers consist of two elements: the frame and cover, and a surrounding. Integral <br />structural concrete ring slab to lower bearing pressure under the cover to allowable limits for aircraft <br />loading. <br />Design Criteria - The covers and frames are cast iron and all have a proof load of 200,000 pounds, <br />and cut sheets have been provided by the City. The structural concrete ring slabs located in the <br />runway shoulders will rarely see the design aircraft loading, and will be designed for overload stress <br />levels for occasional aircraft loading that will ensure no failure. The shoulder paving is also similarly <br />designed for reduced loading. The vault cover structural concrete ring slabs in the active taxiways will <br />be designed for standard design stress for continuous aircraft loading. Design of the thickness of the <br />vault covers will be governed by punching shear of the cover and frame through the structural concrete <br />ring slab, bending from aircraft wheel loads, and allowable bearing pressure under the slab. <br />EUGENE - Corporate Office <br />541.683.5090 <br />Fax: 541.683.6576 <br />920 Country Club Road, Suite 100B <br />Eugene, Oregon 97401-6089 <br />PORTLAND AREA <br />503.620.6103 <br />Fax: 503.620.8416 <br />5005 SW Meadows Road, Suite 120 <br />Lake Oswego, Oregon 97035-4288 <br />SALEM <br />503.589.4100 <br />Fax: 503.589.4141 <br />2235 Mission Street SE, Suite 100 <br />Salem, Oregon 97302-1295 <br />MEDFORD <br />641.774.5590 <br />Fax: 541.774.5591 <br />831 O'Hare Parkway <br />Medford, Oregon 97504-4005 <br />www.obec.com <br />