Department of Army, New England District, Corps of Engineers, 696 Virginia Road, Concord, Massachusetts 01742-2751

R -- PERFORM EROSION ANALYSIS OF DREDGED MATERIAL, PROVIDENCE RIVER AND HARBOR, PROVIDENCE RI DUE 052799 POC Norm Krause (978) 318-8833 E-MAIL: Purchase Branch, Norman.A.Krause@usace.army.mil. The Government intends to negotiate a sole source contract award with Georgia Institute of Technology (Georgia Tech) to perform erosion analysis of dredged material for the Providence River and Harbor Maintenance Project, Providence, RI. The Contractor will be required to perform analysis of sediments for erosion rate and bulk properties and provide data to the Corps of Engineers Waterways Experiment Station (WES), Vicksburg, MS in a timely manner so as not to impact the overall schedule of the subject project. As analysis performed by WES and the Contractor is considered State-of-the-Art, the following is a list of specific requirements needed for this contract: a) Contractor must have a variable high shear stress flume (up to 7-8 Pa) which can accomodate relatively undisturbed core samples b) Flume must be able to accept rectangular core samples and be able to move these samples upward to remain even with the flume bottom surface as erosion occurs, i.e., the flume must be able to accept undisturbed sediment samples and measure the change in erosion rate with depth continuously for sections of the core c) Water flowing over the core sample in the flume should be relatively clean (i.e., low TSS, so no annular flumes) d) Bulk densities of the core samples and their variation with depth must be measured in a detailed manner e) Detailed velocity distributions must be measured within the flume non-intrusively at the location of the core and the profile should be fully developed. Also, vertical and horizontal turbulence should be measured at the test sample location f) Besides measuring erosion rates by degredation of the core, TSS must also be measured g) Location of the flume must be within one days driving distance from both Providence, RI and Vicksburg, MS so as to facilitate easy transport of sediment samples h) Contractor must be able to perform analysis in a timely fashion. (Assuming all sediment samples are received by 1 August 1999, results will be needed l November 1999, with report documentation by 30 January 2000) i) Contractor must be able to perform particle size distribution analysis for particles ranging from 30nm to 2mm j) Detailed measurements of organic content must be made using an Atomic Absorption Spectrophotometer k) Rheologic properties of the sediment sample must be determined precisely using a rheometer to measure yield stress and viscosity. Sediments will be delivered to the contractor in samples weighing approximately 100 lbs each. The total number of samples to be measured within the flume will vary from 15 to 25. No solicitation will be issued. Any questions or proposals indicating qualifications must be in writing and mailed to the address above. If no responses are received by May 27, 1999, award will be made to the Georgia Institute of Technology (Georgia Tech). Posted 05/06/99 (W-SN328390). (0126)

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