LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Appendix H – General NotesSection H.4 General Standard Notes for Construction Plansd. Seed shall be planted with a drill on all slopes of 3:1 or flatter. The drill musthave the capability of handling the kind and rate of seed being planted. Seedmay be broadcast by mechanical spreader, or by hydraulic equipment onareas that are small, too steep, or not accessible for drill seed-operations.Seeding rates shall be doubled when using broadcast or hydraulic seeding.Hydro mulching is allowed on slopes steeper than 4:1.e. Seed planted with a drill shall be covered with soil to a depth of 1/4 to 3/4inch. Seed planted by the broadcast method shall be incorporated into thesurface soil, to a maximum depth of 3/4 inch, by raking, harrowing, or otherproven methods.f. Mulch shall consist of either cereal grain straw or grass hay, at least 50% byweight, being 10 inches or longer. Application rate to be 2000 lbs/acre toachieve a stubbled surface. Anchoring with a mulch crimper is acceptable, orwith the use of a disc plow, set vertical to the ground with sufficient weight toachieve a crimping depth of at least 4 inches into the soil. All mulched areasshall be tackified after crimping. Tackifier, whether placed on soil or mulch,shall conform to the Colorado Highway Specifications, Section 213.02.Apply tackifier with a spray nozzle, dispensing a mist that will uniformly coverthe surface.g. All seeded areas shall be mulched, crimped, and tackified within 24 hoursafter seeding; otherwise, areas shall be reseeded, at the Developer’sexpense, prior to the mulching, crimping, and tackifying.h. All slopes steeper than 4:1 shall be tackified after the completion of seedingand fertilizing. Steep slopes or areas with unstable soil may also require soilretention blankets. Soil retention blankets shall be placed smoothly, butloosely, on the soil surface, without stretching. The upslope end shall beburied in a trench 6 inches wide by 6 inches deep beyond the crest of theslope, to avoid undercutting. There shall be a 6-inch overlap wherever oneroll of blanket ends and another begins, with the uphill blanket placed on topof the downhill blanket. There shall be a 4-inch overlap wherever 2 widths ofblanket are applied side by side. Insert staples in a pattern according to themanufacturer’s recommendation, at approximately 2 staples per square yard.“T” shaped pins shall not be used.i. To aid in germination, some form of irrigation may be required and it is theresponsibility of the Developer to perform any and all necessary operations tothat end.13. The following is the specific seed mix to be used at this site (insert mix):C. Street Improvements Notes1. All street construction is subject to the General Notes on the cover sheet of theseplans as well as the Street Improvements Notes listed here.2. The Larimer County Engineering Department should be notified of utility work,subgrade proof rolls, base course proof rolls, and paving operations. In addition,one or both of the Developer/Owner’s Inspecting Engineer and theDeveloper/Owner’s Materials Testing Engineer should be present. The LarimerCounty Engineering Department should be given at least twenty-four hoursadvance notice. If a Larimer County Engineering Department representative canLarimer County Rural Area Road Standards Page H-6October 22, 2007
Appendix H – General NotesSection H.4 General Standard Notes for Construction Plansnot be present for these activities, these activities may still be conducted, as longas the Developer/owner’s Inspecting Engineer and/or the Developer/Owner’sMaterials Engineer are present.3. Proof rolls should be performed on subgrade prior to placement of road base,and on road base prior to placement of asphalt. All failed areas or material whichexhibits excessive pumping or deformation shall be reworked, replaced orotherwise modified to form a smooth, non-yielding surfaces. Followingprecipitation, all areas should be re-proofrolled as needed based upon theevaluation of the Larimer County Engineering Department. Chemically treatedsubgrade will require proofrolling to demonstrate the adequacy of the chemicalstabilization. Non paved roads will only require one proofroll on subgrade prior toplacement of road base to demonstrate stability, however it is stronglyrecommended that additional proofrolls be performed by the contractor. Proofrollinspection and compaction test results must be approved by theDeveloper/Owner’s Materials Testing Engineer.4. For a mechanical "proof roll", the entire subgrade and/or base material must berolled with a heavily loaded vehicle having a total GVW of not less than 50,000lbs. and a single axle weight of at least 18,000 lbs. with pneumatic tires inflatedto not less that 90 p.s.i.g. “Proof roll” vehicles shall not travel at speeds greaterthan 3 m.p.h. during the proofroll.5. The pavement section design, signed and stamped by a Colorado licensedEngineer, should be included in the construction plan set. Prior to paving, theasphalt mix design must be approved and certified by the Larimer CountyEngineering Department.6. Where proposed paving adjoins existing asphalt, the existing asphalt shall besaw cut from the existing edge to create a clean construction joint. TheDeveloper shall be required to remove existing pavement to a distance where aclean construction joint can be made. Wheel cuts shall not be allowed.7. The top 12 inches of street subgrades shall be scarified and re-compacted priorto subbase installation. No base material shall be laid until the subgrade hasbeen inspected and approved by the Developers material testing engineer.8. Valve boxes and manholes are to be brought up to grade at the time of pavementplacement or overlay. Valve box adjusting rings are not allowed, unlessotherwise directed by the utility company.9. When an existing asphalt street must be cut, the street must be restored to acondition equal to or better than its original condition. The existing streetcondition shall be documented by the Larimer County Engineering Departmentbefore any cuts are made. Patching shall be done in accordance with the LarimerCounty Street Repair Requirements specified in the Larimer County Rural RoadStandards. The finished patch shall blend in smoothly into the existing surface.All large patches shall be paved with an asphalt lay-down machine. In streetswhere more than one cut is made, an overlay of the entire street width, includingthe patched area, may be required. The determination of need for a completeoverlay shall be made by the Larimer County Engineering Department at the timethe cuts are made.10. All traffic control devices shall be in conformance with these plans or asotherwise specified in M.U.T.C.D. (including Colorado supplement) and as perthe Right-of-Way Construction Permit traffic control plan.Larimer County Rural Area Road Standards Page H-7October 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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Chapter 4 - Road Design and Technic
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4.9.1.7 Design VehiclesChapter 4 -
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CHAPTER 5 - GEOTECHNICAL STANDARDS
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Chapter 5 - Geotechnical Standards
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Chapter 6 - STORMWATER MANAGEMENTSe
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Chapter 7 - Bridges and Major Drain
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Chapter 8 - Environmental and Agric
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Chapter 8 - Environmental and Agric
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9.1.3 DefinitionsChapter 9 - Roadwa
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CHAPTER 10 - ACCESS REQUIREMENTS AN
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Chapter 10 - Access Requirements an
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CHAPTER 11 - ACCESS AND UTILITY PER
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Chapter 12 - Right of Way Permittin
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Appendix A - Definitions and Abbrev
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Appendix A - Definitions and Abbrev
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APPENDIX B - REFERENCES AND RESOURC
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Page 154 and 155: Appendix H - General NotesSection H
Page 162 and 163: APPENDIX I - VARIANCE REQUEST SUBMI
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LARIMER COUNTY RURAL AREA ROAD STANDARDS

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