HomeMy WebLinkAboutSPRING CREEK FARMS NORTH SECOND FILING (TRAILS @ TIMBERLINE) - PDP - PDP120004 - SUBMITTAL DOCUMENTS - ROUND 2 - RECOMMENDATION/REPORTEarth Engineering Consultants, Inc.
EEC Project No. 1122605
May 29, 2012
Page 2
would replace the light duty pavement section as outlined in our January 30, 2012 report. The
recommended pavement section would not be for use on any city streets.
We appreciate the opportunity to work with you on this project., If you have any questions
concerning the above information, or if we can be of further service to you in any other way,
please do not hesitate to contact us.
Very truly yours,
Earth Engineering Consultants, Inc.
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Lester L. Litton, P.E.
Principal Engineer
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cc: Shaw Builders, LLC — J.D. Hillman - idhillman a,shawconstruction.net
May 29, 2012
McWhinney
2725 Rocky Mountain Avenue, Suite 200
Loveland, Colorado 80538
Attn: Mr. Chris LaPlante (chrisl(a,mcwhinnev.com)
Re: Alternative Pavement Section
Spring Creek Farms - Multi -Family Development
Fort Collins, Colorado
EEC Project No. 1122005
Mr. LaPlante:
Our geotechnical exploration report for the referenced project was provided to your attention on
January 30, 2012. Within that report, we provided recommendations for minimum pavement
sections for composite pavements (hot bituminous pavement over aggregate base) supported on a
fly ash treated subgrade or a non -reinforced Portland cement concrete pavement. At the request
of Shaw Builders, LLC, we have been asked to evaluate an alternative pavement section to
include a composite section constructed with a Geosynthetic replacing the stabilized subgrade.
Those recommendations are provided with this report.
The near surface subgrades at this site show moderate swell potential at current moisture and
density conditions. Overexcavation and backfill procedures to depths of two (2) feet were
recommended for the pavement areas to reduce potential for post -construction movement. Those
recommendations would not be changed with the use of a Geosynthetic.
To develop a reinforced/stabilized subgrade, we have evaluated an alternative pavement section
including Mirafi® RS580i. The analysis was completed using the TenCateTM Geosynthetic
comparison program.
On the basis of the outlined evaluation, we suggest the alternative pavement section include 3
inches of hot bituminous pavement overlying 6 inches of aggregate base course with a layer of
Mirafi® RS580i on a 2-foot thick moisture treated/compacted subgrade. That pavement section
4396 GREENFIELD DRIVE
WINDSOR,COLORADO 80550
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