LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Chapter 12 – Right of Way Permitting and Construction Standards for Facilities Located in Public Right of WaySection 12.3 Construction DetailsWhen blasting in trenches, the Contractor shall cover the area to be shot with earthbackfill or approved blasting mats. Prior to blasting, the Contractor shall station flaggersand provide signals of danger in suitable places to warn people and stop vehicles. TheContractor shall be responsible for all damage to property and injury to persons resultingfrom blasting or accidental explosions that may occur in connection with the use ofexplosives.12.3.4 Equipment1. The use of trench digging equipment will be permitted in places where itsoperation will not cause damage to existing structures or features, in which casehand methods shall be employed.2. No tracked vehicles shall be permitted on roads unless approved by theEngineer. When tracked vehicles are allowed, existing facilities will be restoredto original condition at the Contractor’s expense.3. Construction equipment and material delivery routing will be made a condition ofthe Permit.12.3.5 DewateringWhere ground water is encountered in the excavation, it shall be removed to avoidinterfering with the work. It is the Contractor’s responsibility to comply with all Federal,State and local permitting requirements prior to beginning any dewatering operations.12.3.6 Removals12.3.6.1 Roads, Paveda. Bituminous pavement shall be saw cut to clean, straight lines and should beperpendicular or parallel to the flow of traffic. (See Section12.4.2.2.a)b. In existing pavement, all excavations within 36" of the edge of the asphaltshall require removal and replacement from the edge of asphalt to theexcavation edge.c. Concrete pavement, cross pans, driveways, roads and alleys shall beremoved to neatly sawed edges cut to full depth.12.3.6.2 Roads, Gravela. When trenches are excavated in roads or alleys which have only a gravelsurface, the Contractor shall replace such surfacing on a satisfactorycompacted backfill with gravel conforming to CDOT Class 5 or Class 6aggregate base course. Gravel replacement shall be one (1) inch greater indepth to that which originally existed, but not less than four (4) inches. Thesurface shall conform to the original road grade. Where the completedsurface settles, additional gravel base shall be placed and compacted by theContractor immediately after being notified by the County, to restore theroadbed surface to finished grade.b. Some roads may have been treated with a special surface treatment tocontrol dust and/or bind the aggregates together. In these cases, theContractor is responsible for restoring the gravel surface to its existingstabilized condition. Such surface treatments shall be of the same chemicalLarimer County Rural Area Road Standards Page 12-7October 22, 2007
Chapter 12 – Right of Way Permitting and Construction Standards for Facilities Located in Public Right of WaySection 12.3 Construction Detailscomposition as what existed prior to the excavation work. The Engineer shallnote on the permit the surface treatment that will be required.12.3.6.3 Concrete Curb, Gutter and SidewalkConcrete shall be removed to neatly sawed edges to full depth for sidewalks andcurb and gutter and shall be saw-cut in straight lines either parallel to the curb orperpendicular to the alignment of the sidewalk or curb. Removal shall be done to thenearest joint or as directed by the Engineer. Replaced sections may require doweledconnections as directed by the Engineer.12.3.7 Backfill12.3.7.1 Flowable-FillFLOWABLE-FILL WILL BE REQUIRED AS UTILITY TRENCH BACKFILL FOR ALLTRENCHES UNLESS OTHERWISE APPROVED BY THE ENGINEER.Refer to Section 5 for compaction requirements. This requirement applies to allpavement and gravel locations. Flowable-fill vibration may be required.The recommended mix for flowable-fill is shown in Table 12-1 below. Concretebackfill will not be allowed within the public right-of-way. Other alternatives to flow fillmay be used if approved by the Engineer. Refer to CDOT specification 206.CementWaterTable 12-1Recommened Mix for Flowable FillINGREDIENTSCoarse Aggregate (Size No. 57) 1700Sand (ASTM C-33) 1845POUNDS/CUBIC YARD42 (0.47 sack)235 (39 gallons or as needed)The maximum desired 28-day strength is 60 psi. The above combination of material,or an equivalent, may be used to obtain the desired “flowable-fill”.Flowable-fill is prohibited as a temporary or permanent road surface. Trenches shallinitially be backfilled to the level of the original surface. After the flowable-fill hascured, the top surface of the flowable-fill shall be removed and the temporary orpermanent surface shall be placed.Bridging and cutback requirements as described in these standards may still berequired if the road failures indicate a clear need.Repair of failed trenches will be the responsibility of the party requiring the trench.12.3.7.2 Conventional Backfill (Other than Flowable Fill)When "non flowable-fill" backfill material has been pre-approved by the Engineer,backfill in existing or proposed roads, curbs, gutters, sidewalks and alleys is dividedinto three (3) categories: initial, intermediate and final lifts as defined below:Larimer County Rural Area Road Standards Page 12-8October 22, 2007
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LARIMER COUNTYRURAL AREA ROAD STAND
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Table of Contents3.3.11 Typical Str
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Table of ContentsCHAPTER 8 - ENVIRO
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Table of Contents12.3.7.2 Conventio
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Table of ContentsG.7.12 Other Permi
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Chapter 1 - General InformationSect
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Chapter 2 - Submittal ProceduresSec
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Chapter 2 - Submittal ProceduresSec
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Chapter 3 - Submittal Requirements
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Page 27 and 28: Chapter 4 - Road Design and Technic
Page 35 and 36: 4.9.1.7 Design VehiclesChapter 4 -
Page 39 and 40: CHAPTER 5 - GEOTECHNICAL STANDARDS
Page 41 and 42: Chapter 5 - Geotechnical Standards
Page 49 and 50: Chapter 6 - STORMWATER MANAGEMENTSe
Page 51 and 52: Chapter 7 - Bridges and Major Drain
Page 53 and 54: Chapter 8 - Environmental and Agric
Page 55 and 56: Chapter 8 - Environmental and Agric
Page 57 and 58: 9.1.3 DefinitionsChapter 9 - Roadwa
Page 59 and 60: CHAPTER 10 - ACCESS REQUIREMENTS AN
Page 61 and 62: Chapter 10 - Access Requirements an
Page 71 and 72: CHAPTER 11 - ACCESS AND UTILITY PER
Page 73 and 74: Chapter 12 - Right of Way Permittin
Page 77: Chapter 12 - Right of Way Permittin
Page 93 and 94: Appendix A - Definitions and Abbrev
Page 95 and 96: Appendix A - Definitions and Abbrev
Page 97 and 98: APPENDIX B - REFERENCES AND RESOURC
Page 110 and 111: APPENDIX D - CONSTRUCTION STANDARDS
Page 112 and 113: Appendix D - Construction Standards
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Appendix D - Construction Standards
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APPENDIX E - CONSTRUCTION TESTING F
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Appendix F - Guidelines for Traffic
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APPENDIX G - DESIGN AND CONSTRUCTIO
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Appendix G - Design and Constructio
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Appendix H - General NotesSection H
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APPENDIX I - VARIANCE REQUEST SUBMI
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LARIMER COUNTY RURAL AREA ROAD STANDARDS

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