RECOVERY--C--PROJECT NUMBER 105013, Portland Harbor Comparative Sampling Study at Post Office Bar, Willamette River, Portland, Oregon

RECOVERY - PER FAR 5.7 THIS NOTICE IS PROVIDED FOR INFORMATION PURPOSES ONLY; THEREFORE FAR 5.203 DOES NOT APPLY. THIS OPPORTUNITY IS AVAILABLE ONLY TO CONTRACTOR(S) UNDER THE CURRENT CONTRACT NUMBER(S): AECOM, W9127N-10-D-0002-0008

Portland District Corps of Engineers intends to issue Task Order number 0008 using recovery act funding to contract number W9127N-10-D-0002 awarded to AECOM for the following procurement: The Contractor is to characterize dredged material using a modified incremental sampling (IS) approach concurrently with conventional sampling protocols found in the 2009 Sediment Evaluation Framework for the Pacific Northwest (SEF), and to compare the effectiveness and utility of each methodology. IS was originally developed by the mining industry and was studied by the Corps for use at explosives-contaminated sites as a way to minimize sampling and subsampling errors by collecting a large number of closely-spaced surface soil samples that are then composited and submitted to a laboratory as a single sample. To the best of our knowledge, IS has not been used to characterize dredged material. The primary goal of IS (as applied to dredged material testing) is to collect equal amounts of material (known as increments) from each core to create a super-composite of material weighing about 1,000 g (wet weight), and then extract and analyze a greater mass of material than what is typically analyzed under the SEF protocol. Results of the analysis shall determine if analyses conducted on a larger subsample pulled from a composite of many cores better represents the true value of the particular analyte(s) in a given unit of material (aka the decision unit). The Corps has selected Post Office Bar as the study area. Post Office Bar is a shoaling area located within the Federal Navigation Channel (FNC) in the Lower Willamette River (LWR) at river mile 2.1-2.4. The proposed dredging prism (DP) varies from 2 to 10-feet deep, with approximately 10% sand.