ATTACHMENT A_Annotated As-Built.pdf
PDF 9 MB Posted
- Attached to
- Cherry Creek Dam (CO) Rehab Gate Stems
- Solicitation number
- W9128F26QA016
About this file
This document is an Annotated As-Built attachment for a federal contract concerning rehabilitation work on rehab gate stems No. 2 and No. 5 at Cherry Creek Dam in Colorado. The contracting agency is the U.S. Army Corps of Engineers, with Contract No. XXX and Solicitation No. W9128F26QA016 issued on February 12, 2026.
The project encompasses comprehensive refurbishment of two hydraulic gate systems located in the intake structure at elevation 5520.0. Work includes replacing bonnet base flanges, studs, nuts, gaskets, and face seals on multiple gate bonnets; replacing oil packing, water packing, and packing glands with new materials; refurbishing cylinder rods (gate stems) through cleaning, mineral buildup removal, pitting elimination, polishing, measuring, and re-chroming; lightly honing cylinder inner walls; replacing cylinder gaskets; cleaning and inspecting piston rings with documented reporting; replacing lower gate stem nut access covers and gaskets; and machining grooves in existing water packing seats for new seal wipers. Gate Stem No. 2 constitutes the base bid, while Gate Stem No. 5 is designated as a bid option. The work area includes access via a contractor access bridge rated at 8 tons GVW, with an operating deck equipped with a 7.5-ton hoist. Detailed drawings, material specifications, parts lists, and photographic documentation of existing conditions are provided throughout the attachment to guide contractor execution and verification of work completion.
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W9128F26QA016
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GA100
PROJECT LOCATION
(CHERRY CREEK DAM,
AURORA, CO )
PROJECT LOCATION
(SEE SHEET GA101 FOR
ENLARGED PLAN AND SECTIONS)
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GA101
PROJECT LOCATION
(INTAKE STRUCTURE)
OPERATING DECK (7.5 TON HOIST)
WORK AREA-GATE CHAMBER (APPROX. EL.5520.0)
CONTRACTOR ACCESS BRIDGE
(8 TON G.V.W. RATED)
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M-100
OPERATING DECK HOUSING OVERHEAD
CRANE AND 7.5 TON HOIST
STAIRWELL ACCESS TO GATE
CHAMBER (EL. 5520.0)
GATE CHAMBER
(EL. 5520.0)
VERTICAL ROLL-UP DOOR
ACCESS TO OPERATING DECK
ACCESS TO RAKING DECK
THRU MARINE DOOR
(MAY BE USED FOR VENTILATION )
#1 #2 #3 #4 #5
GATE STEM # 2
(BASE BID)
GATE STEM # 5
(BID OPTION)
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M-101
#5 #4 #3 #2 #1
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NOTE:
THE HYDRAULIC PIPING SHOWN ON THIS MAY NOT ACCURATELY REPRESENT THE
ACTUAL CONDITIONS. CONTRACTOR MUST FIELD VERIFY ALL EXISTING
CONDITIONS PRIOR TO COMMENCING WORK ON SITE.
GATE STEM #5 (BID OPTION)
GATE STEM #2 (BASE BID)
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M-102
19 2015 16 17 1811 12 13 148 9 10 14 5 6 73
REPLACE EXISTING BONNET BASE FLANGE
STUDS AND NUTS (42 EA) ON EACH BONNET.
REPLACE BONNET GASKETS OR FACE SEALS.
SEE MATERIAL INFORMATION ON SHEET M-106.
REPLACE LOWER GATE STEM NUT ACCESS
COVER GASKET AND FLAT HEAD CAP
SCREWS (28 EA) ON EACH GATE
REPLACE OIL PACKING, WATER PACKING, AND
PACKING GLANDS. SEE DETAILS ON SHEET M-104.
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M-103
REPLACE CYLINDER GASKETS (TYP. 2 PER GATE)
REPLACE CYLINDER GASKETS (TYP. 2 PER GATE)
REPLACE THE WATER PACKING AND PACKING GLAND.
MACHINE A GROOVE IN THE EXISTING WATER PACKING
SEAT AND INSTALL A NEW CYLINDER ROD SCRAPER
(SEAL-GUARD WIPER). REFER TO THE WATER PACKING
SEAT DETAIL ON SHEET M-104. REPLACE ALL BRASS
STUDS AND NUTS.
REPLACE THE OIL PACKING AND PACKING
GLAND. REFER TO THE OIL PACKING AND
PACKING GLAND DETAILS ON SHEET M-104.
REPLACE ALL BRASS STUDS AND NUTS.
SEE SHEET M-105 FOR WORK
REQUIRED FOR GATE
HANGER ASSEMBLY
REFURBISH THE CYLINDER RODS (GATE STEMS) BY
CLEANING, REMOVING HEAVY MINERAL BUILDUP AND
PITTING, POLISHING, MEASURING, AND RE-CHROMING
LIGHTLY HONE THE
INNER WALL OF THE
CYLINDER
LIGHTLY HONE THE
INNER WALL OF THE
CYLINDER
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M-104
REPLACE 6-1/2"
WATER PACKING
REPLACE CYLINDER GASKETS
(2 EA. PER GATE)
MACHINE A GROOVE IN THE EXISTING
WATER PACKING SEAT AND INSTALL A NEW
CYLINDER ROD SCRAPER
REPLACE 6-1/2"
OIL PACKING
REPLACE GLANDS FOR 6-1/2"
OIL PACKING AND 6-1/2"
WATER PACKING
CLEAN AND INSPECT THE PISTON
RINGS AND PREPARE A REPORT IN
ACCORDANCE WITH PWS SECTION
1.2 SCOPE OF WORK.
LIGHTLY HONE
CYLINDER INNER WALL.
CLEAN AND INSPECT THE PISTON
RINGS, AND PREPARE A REPORT IN
ACCORDANCE WITH PWS SECTION
1.2, SCOPE OF WORK.
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M-105
REPLACE 4" OIL PACKING AND GLAND
REPLACE 2-1/2" OIL PACKING AND GLAND
REPLACE 4" OIL PACKING AND GLAND
REPLACE PACKING
GLAND STUDS AND NUTS
REFURBISH THE GATE
HANGER CYLINDER RODS
BY CLEANING, REMOVING
HEAVY MINERAL BUILDUP
AND PITTING, POLISHING,
MEASURING, AND
RE-CHROMING.
GATE HANGER
PARTS
SUBJECT TO
REPLACEMENT
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M-106
GATE STEM OIL PACKING,
AND WATER PACKING
GATE STEM NUT ACCESS COVER SCREWS
BONNET STUDS AND NUTS
GOVERNMENT FURNISHED
WRENCH FOR CONTRACTOR USE
WATER PACKING SEAT TO BE
GROOVED FOR NEW SEAL
WIPER (SCRAPER)
GATE STEM PACKING GLANDS
CYLINDER GASKETS
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US Army Corps of Engineers
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M-107
PHOTO 1. INTAKE STRUCTURE VIEWED FROM
ACCESS BRIDGE (EL.5645.0)
PHOTO 2. OPERATING DECK VERTICAL ROLL-UP DOOR
AND INTEGRAL SWING DOOR (EL.5645.0)
PHOTO 3. 7.5 TON HOIST ON OPERATING DECK
VIEWED FROM BELOW (EL.5645.0)
PHOTO 4. TOP OF AUTOMATIC GATE HANGER
ASSEMBLY VIEWED FROM STAIRWELL
PHOTO 5. OVERVIEW OF GATE CHAMBER LEVEL (EL. 5520.0) PHOTO 6. GOVERNMENT FURNISHED TOOLS ON SITE
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M-108
PHOTO 1. GATE HOIST CYLINDER BONNET BASE PHOTO 2. WATER PACKING GLAND (BOTTOM) & OIL
PACKING GLAND (TOP)
PHOTO 3. AUXILIARY RIGGING BEAM AND WIRE ROPE
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