Attachment E HAHD Drainage Tunnel Horizontal Well As Builts.pdf

PDF 3 MB Posted

Attached to
Howard A. Hanson Dam Relief Tunnel Drain Maintenance
Solicitation number
W912DW24Q0028
Issued by

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This document appears to be a set of attachments related to the Howard A. Hanson Dam (HAHD) Relief Tunnel Drain Cleaning federal contract opportunity, Solicitation Number W912DW24Q0028. The solicitation is for the Department of the Army Corps of Engineers Engineering District Seattle to acquire services for drainage tunnel drain camera inspections, cleaning, decommissioning, and repairs at the HAHD site.

The attachments include as-built drawings and inspection photos for the horizontal drainage wells. The solicitation requires vendors to attend a scheduled site visit on September 10, 2024 to inspect the site and satisfy themselves regarding conditions that may affect contract performance. Vendors must submit certain information prior to the site visit. The solicitation includes several attachments with additional details on decontamination, drain cleaning logs, figures, and as-built drawings for the vertical and horizontal drainage systems.

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Other files

File Type Posted
Amendment W912DW24Q0028 0001.pdf PDF
Amendment 0001 Atch 1 Site Visit Attendance Sheet.pdf PDF
Attachment C Figures for HAHD Drain Maintenance.pdf PDF
W912DW24Q0028 HAHD Relief Tunnel Drain Cleaning.pdf PDF
Attachment D HAHD Drainage Tunnel Vertical Drain As Builts.pdf PDF

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Sand/silt on screen

Leaking end cap

Off-set screen

Grout port showing formation

Grout at joint

Screen off-set, formation visible in gap

Screen off-set, formation visible in gap

Grout port drainage.

Drain partially water filled with possible biofouling.

Clean screen at 20 feet.

Corroded screw, minor rust and crack on corroded end cap.

Corroded screws protrude through all joints.

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2024 THD4 TEST.pdf
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2024 Horizontal Drain Inspection 2.pdf
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File details come from the government source that posted it. Updated .