Specs

Bridgestone Retail Operations, LLC
PROJECT MANUAL
Version: January 2012
B. Mechanically Tamped: The Contractor shall place final granular backfill in maximum 8-inch
layers (loose measure) and mechanically compact it to a density between 90% and 95% of
the maximum density ASTM D-698 with a moisture content near optimum.
C. Water Tamped: Not permissible in this project.
3.16 SAND EMBEDMENT:
A. When sand embedment is required on the drawings, the material used for sand shall be
"builders sand", sandy loam, or other sand material that shall contain no more than 25% clay
and shall be free of rock, lumps or clods.
B. The Engineer shall be the judge as to the suitability of a material for use as sand embedment.
C. Sand embedment shall be used only when the excavated material is not suitable for use as
sand embedment.
D. If the trench bottom is in a soil that conforms to the requirements for sand embedment the
6 inches below the pipe need not be undercut.
3.17 CRUSHED STONE EMBEDMENT:
A. When crushed stone embedment is required on the drawings, the material used for
embedment shall be angular crushed stone, in the general size range of 3/4" to 1/16" which
has good stability. Crushed stone shall be graded in accordance with Size #67 or #68 of
AASHTO M 43, ASTM D 448.
3.18 CONCRETE EMBEDMENT:
A. Concrete Embedment: When concrete embedment is required on the drawings, the concrete
shall conform to Section 03300. Concrete embedment shall be allowed to cure for at least 24
hours before placing initial backfill and at least 48 hours before placing final backfill unless
approved otherwise by the Engineer.
3.19 EXCESS AND UNSUITABLE MATERIAL:
A. Excess and Unsuitable Material: All excess and/or unsuitable excavated material shall be
loaded and hauled offsite by the Contractor and disposed of in a legal manner.
END OF SECTION
PIPE TRENCH EXCAVATION AND BACKFILL 02226 - Page 4 of 4