HomeMy WebLinkAboutSUB200900064 Bond Release 2020-02-25G EO-TERRAI N ORGANIZATION, INC.
YOUR GOALS FOUNDED ❑N OUR INF'ORMATION'9
February 25, 2020
Virginia Asphalt Services, Inc.
Attn: Nick Heilman
493 Burchs Creek Road
Crozet, Virginia 22932
RE. Stone Base Testing
Berkshire Landing Asphalt Observation
Albemarle County, Virginia
GTO Project No.: 19G-206-082-
Dear Mr. Heilman:
As requested, an engineering representative of Geo-Terrain Organization, Inc. (GTO) has visited the
above referenced project site on February 12th, 2020 to check stone base compaction on the end driving
lane between the townhouses at the end of North Berkshire Road. Testing was performed in general
accordance with Virginia Department of Transportation requirements.
Our staff has exercised the degree of care normally associated with a project of this type. On February
12th, 2020, GTO personnel observed the stone base already placed. The stone subbase area was
proofrolled using the available fully loaded, tandem axle on -road dump trucks delivering stone to the site
and observed by GTO personnel. In addition, thickness was checked at the proposed compaction test
locations and was found to be in excess of eight inches at every location. The area appeared to be
stable and sufficiently prepared to test for in -place density.
GTO personnel checked the stone base placement. The Virginia 21A stone was tested for maximum dry
density using the one -point proctor method (VTM-12), resulting in a weight of 141.1 pounds per cubic
foot at an optimum moisture of 7.9 percent, requiring an in -place density of at least 134.0 pounds per
cubic foot. In addition, field density testing using nuclear methods (ASTM D2922) were performed to
check backfill placement. Test results indicate stone base as of February 12th, 2020 appears to
conform to project specifications with regards to in -place density. Please see the field test results listed
below for additional information.
End of Patch near Dead End, density 135.1 pcf, moisture 6.5%
30' from Dead End point, density 137.1 pcf, moisture 6.3%
i 60' from Dead End point, density 134.4 pcf, moisture 7.0%
➢ 90' from Dead End point, density 135.9 pcf, moisture 6.6%
1 00-A INTERSTATE BUSINESS PARK FREDERICKSBURG, VA 2Z405 • OFFICE: 540-368-5724 0 FAX. 540-368-5725
Virginia Asphalt Services, Inc.
Re: Stone Base Testing
Berkshire Landing Asphalt Observation
February 25, 2020
Page 2
Thank you for the opportunity to assist you in this capacity. If you have any questions regarding this
letter, please do not hesitate to contact our office.
RespOni'cal
ted
Geo-ion, I
te.
Geoteer
C:/GTO Document Folder/GTO Geotechnical 2019/19G-206-082/Berkshire Stone Compaction Letter 2-25-20.doc
GEO-TERRAIN ORGANIZATION INC.
"YOUR GOALS FOUNDED ON OUR INFORMATION"
February 27, 2020
Virginia Asphalt Services, Inc.
Attn: Nick Heilman
493 Burchs Creek Road
Crozet, Virginia 22932
RE: Asphalt Testing
Berkshire Landing Asphalt Observation
Albemarle County, Virginia
GTO Project No.: 19G-206-082
Dear Mr. Heilman:
As requested, an engineering representative of Geo-Terrain Organization, Inc. (GTO) has visited the
above referenced project site on February 17th, 2020 to check asphalt compaction on the surface
topping course on the end driving lane between the townhouses at the end of North Berkshire Road.
Testingwas performed in general accordance with Virginia Department of Transportation requirements.
Our staff has exercised the degree of care normally associated with a project of this type. The fresh hot
mix asphalt was checked for temperature and was measured to be 275 degrees Fahrenheit. A short
roller pattern established at the outset of the project indicated six passes of the smooth drum roller is
satisfactoryfor compaction of the SM-9.5A topping course. A short control strip was performed usingthe
recommended five passes of the roller to establish the maximum in -place asphalt density of 139.7
pounds per cubic foot (pcf), requiring a minimum passing test to be 132.7 pcf. Tests were performed
every 50 lineal feet of roadway in the entrance. Based upon observed results, it appears the asphalt
was placed and compacted in general accordance with VDOT requirements. Please see the field test
results listed below for additional information.
➢ End of Patch near Dead End, density 134.6 pcf
➢ 30' from Dead End point, density 134.3 pcf
➢ 60' from Dead End point, density 133.4 pcf
90' from Dead End point, density 132.9 pcf
Thank you for the opportunity to assist you in this capacity. If you have any questions regarding this
letter, please do not hesitate to contact our office.
Geo=
Peter l . F2thara, P.E.
Geotechnical Engineer
C./GTO Document Folder/GTO Geotechnical 2019/19G-206-082/Berkshire Asphalt Compaction Letter 2-27-20,doc
1 00-A INTERSTATE BUSINESS PARK FREDERICKSBURG, VA 22405 * OFFICE: 540-368-5724 0 FAX: 540-366-5725