LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Appendix D – Construction StandardsSection D.2 Revisions to CDOT Standards Specifications for Road and Bridge ConstructionThe sterilization agent (herbicide) shall be a pre-emergent herbicide, soluble, dispersible ormixable in water and non-toxic to humans when applied per the manufacture’srecommendations. The agent shall be active for one year after application.D.2.7 Revision of Section 304 – Aggregate Base CourseREVISION OF SECTION 304AGGREGATE BASE COURSESubsection 304.02 shall include the following:Materials for the base course shall be Aggregate Base Course (Class 5) as shown in subsection703.03.The Aggregate Base Course (Class 5) must meet the gradation requirements and have aresistance value of at least 72 when tested by the Hveem Stabilometer method. The Engineermay require the Contractor to submit test results from a certified materials lab to verify thematerial’s conformance to the requirements of this section. Costs of any such tests shall beborne by the contractor.D.2.8 Revision of Section 304 – Treated Aggregate Base CourseREVISION OF SECTION 304TREATED AGGREGATE BASE COURSESubsection 304.02 shall include the following:Treated Aggregate Base Course (Class 5) (MGCL) shall meet the requirements of Section 304.Table 703-2 for Class 5 material shall be revised to allow 12 to 15 percent passing the #200sieve.Subsection 304.06 shall include the following:Variation from the treated aggregate base course plan elevation specified shall not be morethan 0.04 foot.Subsection 304.06(a) shall be added:Treated Aggregate Base Course (Class 5)(MGCL) shall be placed, mixed, shaped andcompacted as described below:Place and compact the full width and depth of Aggregate Base Course (Class 5) in accordancewith Section 304. MGCL shall then be thoroughly mixed into the upper 4 inches of the roadsurface by scarifying and blading the upper four inches of aggregate base course material intoapproximately equal windrows on each side of the road. Wet, with water, both windrowed andremaining surface materials to approximately four- percent moisture, or as directed. Applymagnesium chloride in two equal sprayed applications of 0.25 gallon per square year each.After each application, used a motor grader (and additional water as necessary to preventLarimer County Rural Area Road Standards Page D-9October 22, 2007
Appendix D – Construction StandardsSection D.2 Revisions to CDOT Standards Specifications for Road and Bridge Constructionsegregation of the materials) to thoroughly process one half of the windrowed material to auniform mixture. Place the processed mixture to grade and compact with a pneumatic tire roller,as specified in this section. Repeat this procedure for the material in the second windrow.Apply a final application of 0.10 gallon per square yard of magnesium chloride to the entirefinished surface. Allow the magnesium chloride to soak in for thirty minutes or as needed toprevent surface displacement before final rolling. Compact the entire cross section with a steeldrum roller in accordance with this section of the specifications. Do not allow traffic on thetreated surface until approved.D.2.9 Revision of Section 308 – Fly Ash Treated SubgradeREVISION OF SECTION 308FLY ASH TREATED SUBGRADESection 308 is hereby added to the Standard Specifications for this project as follows:DESCRIPTION308.01 This work shall consist of treating the subgrade, existing subbase or existing base bypulverization, adding Class “C” fly ash, mixing and compacting of the mixed material to therequired density. This work applies to natural ground or embankment and shall be constructedas specified herein and in conformity with the typical sections, lines, and grades as show on theplans or as established by the Engineer.MATERIALS AND EQUIPMENT(a)Fly Ash. Fly Ash shall meet ASTM Specification 618, Section 3.2, when sampled andtested in accordance with Sections 4, 6, and 8, unless otherwise shown on the plans.Fly ash shall be of the class “C” designation containing a minimum of 25 percent CaO.Fly ash shall be stored and handled in closed weatherproof containers until immediatelybefore distribution on the road.If stored in bins are used; they shall be completely enclosed. Materials in bags shall bestored in weatherproof buildings with adequate protection from ground dampness.Fly ash shall be furnished in trucks, each truck shall have the weight of fly ash certifiedon public scales or the Contractor shall place a set of standard platform truck scales orhopper scales at a location approved by the Engineer.(b)(c)Water. The water used in the stabilized mixture shall be clean, clear, and free ofsewage, vegetable matter, oil, acid, and alkali. Water known to be potable may be usedwithout testing. All other sources shall be tested in accordance with AASHTO T-26 andapproved by the Engineer.Equipment. The machinery, tools, and equipment necessary for proper prosecution ofthe work shall be on the project site and approved by the Engineer prior to the beginningof construction operations. All machinery, tools, and equipment used shall beLarimer County Rural Area Road Standards Page D-10October 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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Page 71 and 72: CHAPTER 11 - ACCESS AND UTILITY PER
Page 73 and 74: Chapter 12 - Right of Way Permittin
Page 93 and 94: Appendix A - Definitions and Abbrev
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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
Page 130 and 131: APPENDIX E - CONSTRUCTION TESTING F
Page 132 and 133: Appendix F - Guidelines for Traffic
Page 140 and 141: APPENDIX G - DESIGN AND CONSTRUCTIO
Page 142 and 143: Appendix G - Design and Constructio
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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