LARIMER COUNTY RURAL AREA ROAD STANDARDS

Chapter 5 – Geotechnical Standards and Pavement DesignSection 5.7 Subgrade Investigation and Pavement Design Report5.7 SUBGRADE INVESTIGATION AND PAVEMENT DESIGN REPORTThe Subgrade Investigation and Pavement Design Report shall be prepared by or under thesupervision of and signed and stamped by a Professional Engineer registered in the State ofColorado and shall include the following information.A. Vicinity map to locate the investigated area.B. Scaled drawings showing the location of final borings.C. Final Plat with road names.D. Scaled drawings showing the estimated extent of subgrade soil types and ESAL foreach road classification.E. Pavement design alternatives for each road classificationF. Tabular listing of sample designation, sample depth, Group Number, Liquid Limit,Plasticity Index, percent passing the No. 200 sieve, AASHTO Classification, GroupIndex and soil description.G. R-value test results of each soil type used in the design.H. Swell/Consolidation Tests.I. Identification of any samples that were consolidated to create composite samples fortesting purposes.J. Test results of Borrow Source (if known).K. Pavement design computer printouts or nomographs properly drawn to show SoilSupport - ESAL - SN.L. Design calculations for all phases of soil report.M. Design coefficient used for asphalt, base course, etc..N. A discussion of potential subgrade soil problems including, but not limited to:1. Heave or settlement prone soils2. Frost susceptible soils3. Ground water4. Drainage considerations (surface and subsurface)5. Cold weather construction (if appropriate)6. Other factors or properties which could affect the design or performance of the7. pavement systemO. Recommendations to alleviate or mitigate the impact of problems discussed in ItemN, above.Larimer County Rural Area Road Standards Page 5-9October 22, 2007