HomeMy WebLinkAboutAddenda - BID - 5895 POWER TRAIL FENCE 22318Administrative Services
Purchasing Division
CITY OF FORT COLLINS
ADDENDUM No. 1
SPECIFICATIONS AND CONTRACT DOCUMENTS
Description of Bid:. 5895 Power Trail Fence — Horsetooth Road to Harmony Road
OPENING DATE: January 24, 2005—3:00pm. (Our Clock)
To all prospective bidders under the specification and contract documents described above, the
following changes are hereby made.
GENERAL CLARIFICATION
1. Fence grounding rods spacing has changed to attached specification below.
2. Bid Item #2 — Field Fabric Fence Bracing Section has increased in quantity from 7 to 9.
ATTACHMENTS
Pages 2G1, 2G2: Technical Requirements Transmission Construction
SPECIFICATIONS
SECTION 02830 — FENCES AND GATES, PART 2: MATERIALS
REPLACE: 2.04 Fences near Electric Lines with Section 2G — GROUNDING
(See pages attached)
BID SCHEDULE
ADD: To the bid schedule— Item #2, Field Fabric Fence Bracing Section,
9EA@$ $
RECEIPT OF THIS ADDENDUM MUST BE ACKNOWLEDGED BY A WRITTEN STATEMENT
ENCLOSED WITH THE BID/QUOTE STATING THAT THIS ADDENDUM HAS BEEN RECEIVED.
215 North Mason Street • 2nd Floor • P.O. Box 580 • Fort Collins, CO 80522-0580 9 (970) 221-6775 • FAX (970) 221-6707
Section 2G - GROUNDING
2G.1 DESCRIPTION. This Section covers specific requirements for the furnishing of all
labor, equipment, and materials necessary for the installation of all permanent grounding of all
steel structures, fences, gates, and buildings as indicated on the drawings and as specified
below.
2G.2 CODES AND STANDARDS. American National Standards Institute (ANSI):
(1) C2 - National Electrical Safety Code.
2G.3 CONTRACTOR -FURNISHED MATERIALS. Contractor shall furnish all required
Cadweld, equipment, and materials as specified herein and as indicated on the drawings.
2GA ANTENNAS. Antennas shall be relocated or modified as directed by the Owner. Costs
and expenses incurred by the Contractor in pursuit of such relocations and/or modifications shall
be paid in accordance with Article GC.19.
2G.5 FENCES. All fences within the right-of-way, and parallel fences within 200 feet of the
transmission line centerline, shall be grounded as specified and indicated on the drawings.
Fences parallel to the centerline shall be grounded at the following intervals:
Distance from Centerline
0
ft
25
ft
50
ft
75
ft
100
ft
125
ft
150
ft
175
ft
200
ft
Grounding Interval
762
ft
779
ft
823
ft
878
ft
937
ft
997
ft
1,056
ft
1,115
ft
1,172
ft
Fences crossing the centerline shall be grounded at each edge of the right -of way. If the angle
of crossing is such that the distance between grounds exceeds 400 feet, additional grounds
shall be installed so that the distance between grounds within the dghtr4way does not exceed
400 feet.
Electric fences that cross the centerline at an angle of less than 45 degrees shall be grounded at
one point on centerline by means of a 60-hertz fence filter. Electric fences that cross the
centerline at an angle greater than 45 degrees shall not be grounded. Parallel electric fences
shall be grounded at intervals directed by the Owner.
The ground wire shall be interwoven with the fence wires except on electric fences.
TECHNICAL REQUIREMENTS
2G-1 TRANSMISSION CONSTRUCTION
2G.6 GATES. All gates within the right-of-way, and those in parallel fences within 200 feet of
the transmission line centerline, shall be grounded as indicated on the drawings and per ANSI
C2.
2G.7 BUILDINGS. All metal buildings, roofs, gutters, windmills, or other stationary objects, if
any, within the right-of-way shall be grounded as indicated or, in special instances, in
accordance with the Owner's directive.
2G.8 WORK OUTSIDE OF TRANSMISSION LINE RIGHT-OF-WAY The Contractor shall
not install any grounds on fences, gates, buildings, windmill and other objects outside of the
transmission line right-of-way without specific written instructions from the Owner.
2G.9 INSPECTION. The Contactor shall not backfill any trenches or excavations for
grounding units before the Owner has verified that all Work has been completed and
acceptable.
2G.10 RESISTANCE TESTS. Contractor, in the presence of the Owner, shall measure the
resistance of all structure grounds by the 3-point fall of potential method with a minimum of three
measurements being taken at different distances from the current probe.
Maximum resistance shall be no greater than 15 ohms when all grounds have been installed
and connected by temporary jumpers so that the grounds may be tested as a system.
Additional ground rod extension units shall be installed when necessary at each foundation as
indicated on the Contract Drawings until either a structure ground resistance not greater than 15
ohms is achieved or a total of four ground rod extension units have been installed.
The ground resistance test shall be completed prior to connecting grounds to the structure.
2G.11 MEASUREMENT AND PAYMENT. Payment will be made at the Unit Prices in the
Basis of Contract Award after Owner has received the test reports in accordance with 2G.10 and
that sufficient ground rods have been installed and the Work is completed. Cost for all testing
shall be included in the unit price.
TECHNICAL REQUIREMENTS
2G-2 TRANSMISSION CONSTRUCTION
REVISED BID SCHEDULE
Bid items are described in Section 01800
ITEM # DESCRIPTION
1. Field Fabric Fence
W/48" Field Fabric
2. Field Fabric Fence
Bracing Section
TOTAL OF BASE BID
(written)
FIRM NAM
SIGNATUF
ADDRESS
PHONE/FAX #
EST. QTY.
UNIT
UNIT PRICE
ITEM TOTAL
5190
LF
$
$
9
EA
$
$
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