FY26 Willapa Sediment Characterization Service

2026-11-03

UPDATED INFORMATION PROVIDED . Please see updated PWS with changes outlined in 5 . 2 . 6 CLIN 6 - EIM Data . Additionally , there is a word document with questions and answers that were submitted by a potential vendor . Please see attached with updated information that may be beneficial in quote submission .//// END OF UPDATE //// PART 1 – GENERAL INFORMATIONThis is a non - personnel services contract to provide technical services for a sediment characterization in Willapa Bay , Washington ( Figure 1 ). The U . S . Army Corps of Engineers ( USACE ) will not exercise any supervision or control over the contract service providers performing the services herein . Such contract service providers will be accountable solely to the Contractor who , in turn , is responsible to the USACE . 1 . DESCRIPTION OF SERVICES / INTRODUCTIONProvide all personnel , equipment , facilities , transportation , tools , materials , supervision , and other items and non - personal services necessary to perform the tasks for a sediment characterization in Willapa Bay as defined in this Performance Work Statement ( PWS ) except as specified in Section 3 as USACE - furnished property and services . Perform to the standards in this contract . 2 . BACKGROUNDAs authorized by Congress , the Seattle District , U . S . Army Corps of Engineers ( USACE ) is responsible for maintenance dredging of the Willapa Bay project components including the entrance channel at Tokeland Marina , the entrance channel and mooring basin access lane at Bay Center , and the entrance channel and mooring basin access lane at Nahcotta , in Pacific County , Washington . USACE last dredged portions of the Willapa Bay navigation project in 2002 . Since then , the Port of Willapa has used a small private cutterhead dredge to maintain portions of the project every two to six years . USACE has continued to evaluate the project , with sediment testing completed in 2007 at Tokeland , 2011 at Bay Center , 2014 at Tokeland , Bay Center , and Nahcotta , and 2020 at Tokeland , Bay Center , and Nahcotta . In the most recent characterization , all dredged material was found to be suitable for open - water disposal ( DMMP 2021 ). Table 1 summarizes details regarding the dimensions of project features and estimated volume above authorized depth . The USACE is responsible for dredging portions of the authorized project as needed to maintain navigation . 3 . Previous Sediment CharacterizationsThe navigation channel is ranked “ low ” by the Dredged Material Management Program ( DMMP ) agencies for concern for potential contamination . Descriptions of the historical characterization efforts follow . Tokeland1991 . A single composited dredged material management unit ( DMMU ) sample representing the marina ( including marina area P1 ) was collected in 1991 and analyzed for DMMP chemicals of concern ( COCs ). Three COCs ( 4 - methylphenol , phenol , and pyrene ) had detected exceedances ; non - detect exceedances occurred for an additional number of chemicals . Bioassay testing was conducted , and the DMMP agencies determined that the dredged material was suitable for unconfined open - water disposal ( DMMP 1991 ). 1998 . Twelve individualgrabsamples were collected in March 1998 and composited into three DMMUs to represent 76 , 000 cubic yards ( CY ) from the entrance channel , marina , and marina area P1 . There were no COC detections or non - detect concentrations that exceeded the DMMP screening levels . All material was found suitable for open - water disposal ( DMMP 1998a ). 2006 . A total of elevengrabsamples were collected from the entrance channel , marina , and marina area P1 in August 2006 ; the grab samples were composited into three composites to represent the entrance channel , marina , and marina area P1 . Based on the two previous sequential testing rounds conducted in 1991 and 1998 , the marina and marina area P1 were re - ranked from moderate to low - moderate for testing purposes . No COCs were detected above the DMMP screening levels . Five non - detected chemicals ( hexachlorobenzene , dimethylphenol , benzoic acid , N - nitrosodiphenylamine , and alpha - chlordane ) had detection limits that exceeded DMMP screening levels in one or all three DMMUs ; bioassay testing was thus required for all three DMMUs . The results from the bioassay testing indicated that all of the material was suitable for unconfined open - water disposal ( DMMP 2007 ). 2014 . Eightcoreswere collected from the entrance channel , marina , and marina area P1 in September 2014 and composited into four DMMUs ( 2 surface and 2 subsurface DMMUs ). No COCs were detected above DMMP screening levels ; three COCs ( total chlordane , dieldrin , and heptachlor ) were not detected with elevated reporting limits above their respective DMMP screening levels in all four DMMUs . All DMMUs samples were subsequently analyzed for the standard DMMP pesticide COCs using a high resolution method with lower reporting limits ; using this method , all pesticides were non - detect with detection limits below the DMMP screening levels . Total dioxin Toxic Equivalencies ( TEQs ) were below the 15 pptr TEQ and 5 pptr 2 , 3 , 7 , 8 - TCDD threshold concentrations for dispersive disposal in Willapa Bay . Total TEQs ( U = 1 / 2 reporting limit [ RL ]) ranged from 1 . 2 to 2 . 7 pptr . All material was found suitable for unconfined open - water disposal ( DMMP 2015 ). 2020 . Ninecoreswere collected in August 2020 . Material from the cores were composited into three DMMUs to represent the entrance channel , marina , and marina area P1 . All material was found suitable for unconfined open - water / flow - lane disposal ( DMMP 2021 ). Bay Center1998 . Tier 1 no - test for 15 , 000 CY from Bay Center Entrance Channel , based on a 1993 grain size characterization that showed 99 . 7 % sand from two samples ( DMMP 1998b ). 2001 . Vibracoresamples characterized 38 , 000 CY of proposed dredged material . Cores were composited into three DMMUs : two surface and one subsurface DMMUs . Analyses included all routine DMMP COCs ( including tributyltin [ TBT ], but no dioxin ) and included special analyses for pesticides carbaryl and glyphosate . All chemicals were either detected or not detected below DMMP screening levels ( SLs ), and TBT was quantitated at levels well below the screening limit in the porewater of the three DMMUs characterized . All sediments were found suitable for open - water disposal ( DMMP 2001 ). 2011 . Port of Willapa proposed 18 , 000 CY of dredging in shoals leading to the Bay Center Marina . Five individualgrabsamples were composited into one DMMU . Laboratory analysis was conducted for the standard DMMP COCs plus glyphosate and dioxins . There were no SL exceedances ; dioxin TEQ ( U = 1 / 2 RL ) was 1 . 36 pptr . All material was found suitable for open - water disposal ( DMMP 2011 ). 2015 . Eightcoreswere composited into two surface DMMUs . Porewater TBT was not detected at 0 . 005 mg / L . Diethyl phthalate initially exceeded the SL in DMMU 2 , but further replicated extractions and reanalysis did not replicate this finding . Because diethyl phthalate is a common laboratory contaminant , the DMMP concluded that the original finding was anomalous . Dioxin TEQs ( U = 1 / 2 RL ) were 1 . 33 and 0 . 62 pptr , well below the 15 pptr TEQ threshold for Willapa Bay . All material was found suitable for open - water disposal ( DMMP 2015 ). 2020 . To characterize approximately 72 , 000 CY , sixcoreswere collected in the Inner Channel and composited into two DMMUs for laboratory analysis of the DMMP COC list . In the Palix River access lane , threegrabswere composited for one DMMU analyzing total solids , total organic carbon , and grain size under the Tier 1 no - test exclusionary status . and all material was found suitable for open - water / flow - lane disposal ( DMMP 2021 ). Nahcotta2004 . In September 2003 , coreswere collected from a total of 17 locations and composited into four composite DMMUs to represent 145 , 000 CY of proposed dredging . Only standard DMMP COCs were analyzed for , and there were no detected or undetected results above screening levels . All material was found suitable for unconfined open - water disposal ( DMMP 2004 ). 2015 . In September 2014 , fortycoreswere collected and subsequently composited to represent eleven DMMUs , of which one was a subsurface DMMU . No COCs were detected above DMMP screening levels . Two COCs ( total chlordane and heptachlor ) were undetected with elevated reporting limits above their respective DMMP screening levels in two DMMUs . All DMMU samples were subsequently analyzed for the standard DMMP pesticide COCs using a high - resolution method with lower reporting limits ; using this method , no pesticides were detected or not detected above the DMMP screening levels . TBT ( porewater ) was undetected at 0 . 005 mg / L . Total dioxin TEQs were below the 15 pptr TEQ and 5 pptr 2 , 3 , 7 , 8 - TCDD threshold concentrations for dispersive disposal in Willapa Bay . Total TEQs ( U = 1 / 2 RL ) ranged from 1 . 2 to 3 . 7 pptr . All material was found to be suitable for unconfined open - water disposal ( DMMP 2015 ). 2020 . Sixteencoreswere collected in the entrance channel and boat basin to characterize three surface and two subsurface DMMUs . Sampling was conducted in August 2020 . The standard DMMP COC list was analyzed and no COCs were detected above DMMP screening levels . All material was found suitable for open - water / flow - lane disposal ( DMMP 2021 ) OBJECTIVESThe objectives for this contract are as follows : to prepare a sampling and analysis plan ( SAP ) that shall be suitable for submission to the DMMP agencies for approval ; to sample and characterize the sediments in the proposed dredging area as described in the SAP ; andto prepare a report to document characterization results that can then be used by DMMP to make a suitability determination . This PWS includes preparation of the SAP ; sampling and testing of dredged material ; data collection and analysis ; and report preparationSCOPEPerform a sediment characterization in Willapa Bay . The services provided under this contract are detailed in Part 5 – Specific Tasks . PLEASE SEE ATTACHED PWS , EVALUATION CRITERIA , & BID SCHEDULE for specific information and criteria for this acquisition .

Washington

2026-05-14