Appendix B Switzerland Park Exclusion Fencing Specs.pdf
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- Attached to
- PKAA, Switzerland Park Project
- Solicitation number
- DQ1 PKAA 2027000077 1
- Issued by
- Colorado
About this file
This document is a technical specification appendix for exclusion fencing installation at Switzerland Park. The specification details the materials, installation methods, and quality standards required for constructing a steel post and wire fabric fence designed to exclude access to mine openings. The fence shall be installed per Standard Work Specification 17 and Standard Drawing 8 from the 2009 General Bid Specifications, with modifications outlined herein. Key requirements include 10-foot long steel posts with a minimum outer diameter of 2-3/8 inches, galvanized in accordance with AASHTO M 111, anchored at 10-16 linear feet intervals approximately 10-15 feet from mine openings. Post holes must be a minimum of 1.5 inches wider than the post diameter, with depths of 24 inches in unconsolidated or weathered bedrock, or 18 inches minimum below ground surface where solid bedrock is encountered within one foot of the surface. Posts shall be anchored using Class B foundation concrete from base to ground surface, with all hollow posts filled with concrete.
The fence fabric specifications call for 72-inch high, 12.5-gauge or larger galvanized metal wire fabric with 6-inch by 6-inch maximum spacing, securely attached to posts with 9-gauge wire ties. Corner posts must be cross-braced with 9-gauge wire secured using metal sleeves, with internal angles of 135 degrees or less. All gaps under the fence exceeding 6 inches in any direction shall be closed using pre-approved equivalent materials to achieve consistent 6-inch by 6-inch or less spacing to ground level. The specification permits field-mixed concrete or pre-packaged concrete as alternatives to Class B if pre-approved by the Project Manager. Gates, if required, shall be 6 feet by 3 feet, set between two posts with a maximum 6-inch clearance from ground surface, hinged in three locations, and fitted with two latches including one locking latch. The contractor is responsible for necessary clearing and grubbing to achieve required grade and alignment, and all materials shall be standard commercial grade unless otherwise specified.
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Text version
Appendix B
Switzerland Park Exclusion Fencing Specifications
The exclusionfencewillbeinstalledperStandardWorkSpecification17andStandard Drawing 8, General Bid Specifications, 2009. These specifications will be modifiedas follows.
The CONTRACTOR shall provide and install:
1. 10-foot long, steel posts asdetailedbelow(orequivalentifpre-approvedbythe
PROJECT MANAGER). The line posts will be anchored at least every 10-16 linear feet at locations to maintain fencing approximately 10-15 feet from the mine openings, as directed in the field by the PROJECT MANAGER.
2. Acornerpostconfigurationwillbeusedateachcornerwithaninternalangleof 135 degrees or less.
3. Post hole width diameter should be a minimum of one and a half(1.5)inches wider than the post outer diameter. Post hole depth shall be a minimum of twenty-four (24) inches for holes in unconsolidated or weathered bedrock. For areas where solidbedrockisencounteredwithinone(1)footofgroundsurface, posts shall be set aminimumof eighteen (18) inches belowground surface.
4. The posts will be anchored in the hole with Class B foundation concrete from base to ground surface.
5. 9-gauge wire will be used tocross-bracethecornerposts.Wirewillbesecured using metal sleeves.
6. 72-inch high 12.5-gauge or larger galvanizedmetalwirefabric“fieldfence”with spacing no greater than 6-inches by 6-inches. The wire fabric will be securely attachedtotheposts.Anyoverlappingwirefabricshallbesecuredwith9-gauge wire ties.
Construction Notes:
The Contractor shall perform such clearing and grubbing as may be necessary to construct the fence to the required grade and alignment.
Class B foundation concrete will be used for fence posts, braces, and anchors.
ConcretewithlightweightaggregatesconformingtoASTMC330willbepermitted.Field mixedconcreteconsistingofaminimumofonepartcementtosixpartsofaggregateby volumeorpre-packagedconcretemaybeusedinlieuofClassBifpre-approvedbythe
PROJECT MANAGER.
When the plans require that posts, braces or anchors be embeddedinconcrete,they shall be securely braced to hold the posts in proper position until such time as the concretehassetsufficientlytoholdtheposts.Materialsshallnotbeinstalledonposts, or stress placed on guys and bracing set in concrete until the concrete has set sufficiently to withstand the stress, or as directed by the PROJECT MANAGER.
Gaps under the fence measuring more than 6-inches in any direction shall be closed usinganequivalentmaterialandmethodpre-approvedbythePROJECTMANAGERto achieve spacing of 6-inches by 6-inches or less to ground level.
Thetopsofallpostsshallbesettotherequiredgradeandalignment.Wireorfencingof the size and type required shall be firmly attached to the posts and braces in the manner indicated on the attached specification. Allwireshallbestretchedtautandbe installedtotherequiredspacing.Loosefencesegmentsmaybestretchedtaughtusing the intermittent placement of 8-ft steel T-posts to take up any slack.
Steel posts shall have a minimum outer diameter of 2-3/8 inches and shall be galvanized in accordance with AASHTO M 111. Fittings, hardware and other appurtenances not specifically covered by the Contract shall be standard commercial grade, andinaccordwithcurrentstandardpractice.Pipematerialforfencepostsshall conform to the requirements shown on the plans and to the requirements of Class 1 Pipe,GradeAorGradeB,ofFederalSpecificationRR-F-191/3C.Hollowpostmaterial shall be filled with concrete.
GATES:Mangates,ifrequired,willbe6ftx3ftsetbetweentwopostsamaximumof6 inchesoffthegroundsurfaceatanylocation.Thegatewillbehingedononesidetothe support post in three (3) locations, and include two (2) latches (one locking) on the opposite post.
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