MOUNT SAINT HELENS SEDIMENT RETENTION STRUCTURE CREST RAISE

***16-SEP-25*** THE PURPOSE OF THIS AMENDMENT IS TO UPDATE THE CONSTRUCTION WAGE DETERMINATION WA20250123 DATED 09/12/2025. SEE SUMMARY OF CHANGES. ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED.

***09-SEP-25*** THE PURPOSE OF THIS AMENDMENT IS TO PROVIDE UPDATED AND CORRECT CUT/FILL REPORT SPREADSHEET CALCULATIONS TITLED "MSH SRS SECONDARY SPILLWAY RAISE - REVISED CUT FILL REPORT AMENDMENT 0004" TO REPLACE THE FORMER A9 VOLUME CALCULATIONS.

***03-SEP-25*** Solicitation Amendment 0003: THE PURPOSE OF THIS AMENDMENT IS TO EXTEND THE BID SUBMISSION DUE DATE TO 11:00 A.M PST ON 22-OCT-2025.

***28-AUG-25*** Solicitation Amendment 0002: THE PURPOSE OF THIS AMENDMENT IS TO ADD THE FOLLOWING FOR INFORMATION ONLY (FIO) HISTORICAL DOCUMENTS WITH PICTURES AND DRAWINGS.

- FOUNDATION PREP AND TREATMENT 1991 FND REPORT

- SRS RAISE FOUNDATION CONDITION_15OCT2012

The purpose of this amendment is to add the following for information only (fio) historical documents with pictures and drawings.

- Foundation Prep and Treatment 1991 fnd Report

- SRS Raise Foundation Condition_15OCT2012

***25-AUG-25*** Amendment 0001 has an updated Wage Determination. Also FIO from 1991 and 2012 respectively.

***01-AUG-25*** Added Plans: Vol II are the For Information Only (FIO) sheets showing previous work done for the SRS, including investigation, RCC and valvehouse (to decommission). The Vol II sheets only have previous work or existing conditions.

***28-JUL-25*** Plans have been uploaded. We have Modeling files for this solicitation that cannot be uploaded, please email me Andrew.J.Sprys@usace.army.mil and I can send these through DoD Safe.

***24-JUL-25*** Having difficulty trying to upload the plans/drawings but we're working on it and they will be available as soon as we are able.

Description of Requirement: The project purpose is to The U.S. Army Corps of Engineers, Portland District, has a requirement to construct an increased level of sediment retention structure providing additional storage and allowing existing river flows. The work includes mobilization/demobilization, river diversion, rock excavation, rock foundation preparation including placement of dental concrete, placement of roller-compacted concrete, outlet works sealing, and incidental related work. This effort is to include all associated works required and described within this Contract package

Project Background. The Sediment Retention Structure was constructed in the Late 80's to store the sediment coming off the avalanche area so that the sediment does not flow down to the low Cowlitz River. The main objective for the project is to keep the level of Protection on the levee systems from Castle Rock to Lexington. There has already been one crest raise in 2012 and this will be the second of three planned crest raises.

The project purpose is to construct an increased level of sediment retention structure providing additional storage and allowing existing river flows. The work includes mobilization/demobilization, river diversion, rock excavation, rock foundation preparation including placement of dental concrete, placement of roller-compacted concrete, outlet works sealing, and incidental related work. This effort is to include all associated works required and described within this Contract package.

The work will be located at the Sediment Retention Structure on the North Fork Toutle River in Cowlitz County, Washington, off of Highway 504. Contractor access to the work site will be from gravel access roads on the dam site, the gravel roadway on top of the embankment dam, the top of the concrete outlet works structure, and a paved roadway on the spillway approach pier west of the existing spillway crest.

Purpose: The project purpose is to construct an increased level of sediment retention structure providing additional storage and allowing existing river flows. The work includes mobilization/demobilization, river diversion, rock excavation, rock foundation preparation including placement of dental concrete, placement of roller-compacted concrete, outlet works sealing, and incidental related work. This effort is to include all associated works required and described within this Contract package.

The work will be located at the Sediment Retention Structure on the North Fork Toutle River in Cowlitz County, Washington, off of Highway 504. Contractor access to the work site will be from gravel access roads on the dam site, the gravel roadway on top of the embankment dam, the top of the concrete outlet works structure, and a paved roadway on the spillway approach pier west of the existing spillway crest