HomeMy WebLinkAboutSUB200400188 Review Comments Road Plan and Comps. 2005-09-22 09126/2005 07:26 4349793759 VDOT PAGE 01/02
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Virginia Department of Transportation
Charlottesville
e Residency
701 VDOT Way
Charlottesville, VA 22911
Phone (434) 293-0011
FAX(434)979.3759
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09/26/2005 07:26 4349793759 VDOT PAGE 02f02
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VIRGINIA DEPARTMENT QF TRANSPORTATION
INTRA-DEPARTMENTAL MEMORANDUM
September 22,2005
MEMORANDUM TO: Mr.J.S. Utterback
ATTENTION: Mr. C.T.Baber
FROM: Roger C. River
SUBJECT: CBR Tests&Pavement Design
Fray's Ridge Crossing,sta. 10+00 to 33+50
Terra Bella Subdivision(formerly Fray's Grant Subdivision)
Albemarle County
In response to your memo dated 9-9-05,I have reviewed the six(6)CBR tests submitted for the above roadway
segment. My review indicates that the tests appear to have been performed in a satisfactory manner.
On the basis of these test results and the 850 VPD design traffic volume shown on the sheet provided with the
tests,my pavement design analysis indicates that the proposed pavement section of 1.5"SM-9.5A.,4"BM-25.0A
and 6"Aggr.Base Material,Type I,Size 21A is more than structurally adequate. In fact the base asphalt can be
reduced to 3"and the design would still exceed requirements.
Let me know if further discussion is desired.
v LxP/l/
Roger C.Riner
Assistant District Materials Engineer
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09107/2005 08:10 4349793759 VDOT PAGE 01/02
Virginia Department of Transportation sportatioa
Residency
701 VDOT Way
Phone (434)293-0011 Charlottesville, VA 22911
Date: _ - FAX(434)979-3759
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09107/2005 08:10 4349793759 VDOT PAGE 02102
VIRGINIA DEPARTMENT OF TRANSPORTATION
INTRADEPARTMENTAL MEMORANDUM
September 2,2005
MEMORANDUM TO: Mr.J.S.Utterback
ATTENTION: Mr,C.T. Baber
F I 'E„
FROM: Roger C.River T 20
SUBJECT: CBR Tests&Pavement Design G c: =^'..Y OFFICE
Blucgate Court
Fray's Grant Subdivision
Albemarle County
In response to your transmittal dated 8-24-05,I have reviewed the four(4)CI3R tests submitted for the above
roadway. My review indicates that the tests were generally conducted in a satisfactory manner. There are a
couple of minor computation en-ors on the reports that I have brought to the attention of the testing laboratory,
but that do not affect the CBR values determined by the tests.
On the basis of these test results and the anticipated traffic volume of 90 VPD,my pavement design analysis
confirms that the plan design of 2"SM-9.5A over 6"Aggregate Base Material,Type I,Size 2IA provides a more
than adequate structural capacity.
I do note that the degree of subgrade compaction shown on the copy of the plan typical section enclosed with
the test data is incorrect. Subgrade(i.e. the top 6 inches of earthwork in both cut and fill sections)is required to
be compacted to 100%. Fill below subgrade only requires the 95%value shown on the typical section.
Please advise if further discussion is desired.
Pe,.e.,„ .)la
R ged r C.Rincr
Assistant District Materials Engineer