PDX 2026-501 (158) C9.07.pdf
PDF 957 KB Posted
- Solicitation number
- 147231
- Issued by
- Multnomah County, Oregon
About this file
This is a technical specification document for the Portland International Airport North Runway Rehabilitation project in Oregon, specifically detailing storm drainage and manhole construction requirements. The document provides comprehensive specifications for Type B precast storm sewer manholes, including design standards, materials, installation procedures, and safety requirements. All precast sections must conform to ASTM C-478, with reinforcement meeting ASTM A615 Grade rebar or ASTM A497 welded wire specifications. Manholes are designed to accommodate 100,000-pound wheel loads with 250 PSI tire pressure and require shop drawings and structural calculations stamped by a licensed Oregon structural engineer. Backfill around structures within new or existing pavements or within 10 feet of pavement must utilize Controlled Low Strength Material (CLSM), while other areas follow standard specifications. The project requires installation of PORT-furnished confined space signage on all new and existing unsigned confined space structures within the project area, with designated identification numbers applied using permanent markers and powder-actuated fastening tools.
The specifications include detailed attachment procedures for confined space signs using Hilti powder-actuated guns with varying fastener options and charge settings depending on substrate material (concrete, hard cast iron, or brittle concrete). Manhole frames and covers must be ductile iron with bolted covers and aircraft-rated grates to meet the airport's operational requirements. Manhole access steps and lid openings must conform to OSHA standards (sections 1910.23(D) and 1910.24(B)), with steps spaced at 12-inch centers conforming to City of Portland Standard Plan P-168. The document was prepared by HNTB Corporation and dated October 2026, with design oversight from registered professional engineer Hans N. Conradt (License PE 60434, expiring December 31, 2027). No pricing, contract duration, or award information is contained within this technical specification document.
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Text version
1. ALL PRECAST SECTIONS SHALL CONFORM TO REQUIREMENTS OF ASTM C-478.
2. REINFORCEMENT SHALL BE REBAR MEETING ASTM A615 GRADE OR WELDED WIRE MEETING ASTM A497.
3. INSTALL PORT FURNISHED CONFINED SPACE SIGNS IN ALL STRUCTURES, SEE DETAIL
4. BACKFILL AROUND STRUCTURES WITHIN NEW OR EXISTING PAVEMENTS OR WITHIN 10' OF ANY PAVEMENT SHALL BE CONTROLLED LOW STRENGTH MATERIAL (CLSM). BACKFILL AROUND ALL OTHER STRUCTURES
SHALL BE PER THE SPECIFICATIONS.
GENERAL NOTES:
13" CC
INSIDE OF
MANHOLE
WALL
3" M
IN
- 1
/2 " M
IN
13 - 1/2"
14 - 1/4"
NOTE:
1. MANHOLE STEPS SHALL CONFORM TO CITY
OF PORTLAND STANDARD PLAN P-168.
NOTES:
1. CONFINED SPACE SIGNAGE IS TO BE ATTACHED TO PORT IDENTIFIED NEW CONFINED SPACE STRUCTURES AND EXISTING
UNSIGNED CONFINED SPACE STRUCTURES WITHIN THE PROJECT AREA.
2. WRITE THE DESIGNATED CONFINED SPACE IDENTIFICATION NUMBER ON THE PORT PROVIDED SIGN (SPACE ID) USING A PERMANENT MARKER IN A CLEAR, LEGIBLE MANNER, PORT WILL PROVIDE NUMBER FOR EACH SPACE.
3. PERMANENTLY ATTACH THE SIGN TO THE CONFINED SPACE IN THE MANNER SPECIFIED IN THE TABLE (BASED ON MATERIAL)
ATTACHING CONFINED SPACE SIGNS
TOOL: HILTI POWDER ACTUATED GUN, MODEL DX 36 M
MATRIX BEING ATTACHED
TO
FASTENER CHARGE CHARGE SETTING NOTES
CONCRETE X-DAK 16P8 WITH
R-23 WASHER
YELLOW (50352/4) DIALED TO THE
ABSOLUTE
MINIMUM
THIS WORKS WELL BECAUSE OF THE SHARP,
SHORT FASTENER. IF THIS DOES NOT WORK, TRY
THE NEXT CONCRETE SUGGESTION BELOW.
CONCRETE X-DNI 27P8S15 YELLOW (50352/4) DIALED FROM
ABSOLUTE
MINIMUM TO .5
THIS FASTENER COMES WITH A SMALL WASHER
ALREADY ATTACHED. IF THIS BLOWS THROUGH
THE SIGN YOU SHOULD USE A R-23 WASHER.
OLD CONCRETE - HARD
CAST IRON
NO SUGGESTION THESE ARE VERY TOUGH TO ATTACH TO. WITH
THE HARD CAST IRON TRY 2-4 TIMES AND IF IT
DOES NOT ATTACH, GO FOR THE CONCRETE
BELOW THE RING. FOR THE OLD BRITTLE
CONCRETE TRY ALL THREE FASTENERS, ONLY
OCCASIONALLY THEY ARE UNSUCCESSFUL.
C9.07
VA
R
IA
BL
E
VA
R
IA
BL
E
VARIES
M
IN
MANHOLE
RINGS
3" M
IN
THE MANHOLE MAY
POURED MONOLITHIC TO
8" ABOVE THE BARREL
OF THE MAIN SEWER
PRECAST TOP SLAB
PRECAST RISER
6" MIN/16" MAX
30"
ANCHOR FRAME TO MANHOLE
STRUCTURE WITH 4 - 3/4" x 12"
LONG EXPANSION ANCHORS
" M
AX
MANHOLE FRAME AND
COVER, SEE NOTE 2
RUBBER GASKET
TYPICAL ALL JOINTS
BREAK OUT 2" CLEAR (MIN.)
STEPS @ 12" O.C.
SEE DETAIL 2
C9.07
6" 6"
12" MIN
CRUSHED AGG. BASE COURSE
(P-209) - COMPACT TO 95% AS
DETERMINED BY ASTM D1557
VA
R
IE
S
NOTES:
1. TYPE B MANHOLES SHALL BE PRECAST AND DESIGNED FOR LOADING
OF 100,000 LBS. (100 KIPS) AND 250 PSI. THE CONTRACTOR SHALL
SUBMIT SHOP DRAWINGS AND STRUCTURAL CALCULATIONS STAMPED
BY A LICENSED STRUCTURAL ENGINEER IN THE STATE OF OREGON FOR
APPROVAL.
2. MANHOLE FRAME AND COVER SHALL BE DUCTILE IRON & DESIGNED TO
MEET 100,000 LB, WHEEL LOADS WITH 250 PSI TIRE PRESSURE. COVER
SHALL BE BOLTED TO FRAME. MANHOLE CATCH BASIN GRATE SHALL BE
AIRCRAFT RATED.
3. BACKFILL AROUND STRUCTURES WITHIN NEW OR EXISTING
PAVEMENTS OR WITHIN 10' OF ANY PAVEMENT SHALL BE CONTROLLED
LOW STRENGTH MATERIAL (CLSM). BACKFILL AROUND ALL OTHER
STRUCTURES SHALL BE PER THE SPECIFICATIONS.
4. MANHOLE ACCESS STEPS AND LID OPENING SHALL CONFORM TO
APPLICABLE STANDARDS FOR DIMENSIONS AND CLEARANCES,
PARTICULARLY OSHA SECTIONS 1910.23(D) AND 1910.24(B). SEE DETAIL
C9.07
10/6/2026
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DESIGN NUMBER PROJECT NUMBER
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1:49:40 PM NCHOWDHURY c:\users\nchowdhury\dc\accdocs\hntb corporation\88598 - pdx north runway rehab\project files\shared cad\sheets - civil\storm drainage details.dwg
DISC. SHT. NO.
DRAWING SCALE IS REDUCED 50% WHEN SHEET SIZE IS 11" x 17"
DESIGN BY
DRAWN BY
CHECKED BY
DATE
SHEET NO.
SUBMITTED BY
DRAWING NO.
TYPE:
1/
4" 1/
2" 1"
1/
4" 1/
2" 1"
DATE BY REVISION APPDATE BY REVISION APP ##
IF ELECTRONIC SIGNATURE IS BROKEN OR MISSING - THIS IS NOT A LEGAL DRAWING
PORTLAND INTERNATIONAL AIRPORT
NORTH RUNWAY REHABILITATION
STORM DRAINAGE AND UNDERDRAIN DETAILS 1
GENE TUPPER
C. EISELER
N. CHOWDHURY
H. CONRADT
OCTOBER 2026
158 CD
PDX 2026-501 C9.072024D011 102981
SCALE:
STORM SEWER MANHOLE TYPE "B"
AIRCRAFT RATED
N.T.S.1
SCALE:
MANHOLE STEP
N.T.S.2 SCALE:
CONFINED SPACE SIGN
N.T.S.3
RE
G ISTERED PROFESS IONALENG I NEER
MARCH 9 , 1999
60434PE
OREGON
12/31/27EXPIRES:
HA NS N . CONRA DT
| 2026-10-06T17:38:00-0700 | |
| Hans N Conradt |
File details come from the government source that posted it. Updated .