Before construction of the pavement, the subgrade shall be in
a properly finished condition conforming to the proper line and grade
and free of any soft spots or other deficiencies. Not more than 24
hours prior to commencing of operations on any subgrade, the subgrade
shall be tested by running a roller of a weight at least equal to
that to be used in the paving operation over the entire subgrade area.
When permitted by the engineer, testing may be performed by other
equipment such as loaded trucks. When in the opinion of the engineer
or his representative, the deformation of the subgrade under such
test is excessive, the subdivider will be required to stabilize the
subgrade in a manner satisfactory to the engineer. The subgrade shall
not be prepared during freezing weather or when frozen or when it
is unstable.
The method of construction shall conform to the same specification indicated for materials in §
310-53-1 above. The base course shall be laid on a properly prepared subgrade and shall consist of two equal courses. Upon completion of base course construction, the contractor shall cut samples from the pavement with a jackhammer, coring machine, or other means suitable to the engineer. The sample shall be intact for the full thickness of the base course and shall be of a size suitable to the engineer. At least one sample shall be cut for every 1,000 square yards of base course. Where deficiencies in the required minimum thickness are noted, at least two additional cores will be required to determine the extent of such deficiency. The average thickness of the base course as determined by any five or more samples, representing contiguous areas of pavement, shall be not less than five inches or six inches and the minimum thickness permitted at any location will be 4 1/2 inches or 5 1/2 inches. In the event that the average thickness is less than five inches or six inches or the minimum thickness 4 1/2 inches or 5 1/2 inches, the deficiency shall be made up by increasing the thickness of the surface course.
[Added 11-6-2001 by Ord.
No. 21-2001]
In case of any development street which is to be dedicated to
the Township, the development shall employ the services of a testing
laboratory to obtain cores of the street pavement, to test said cores
for thickness, composition and density for each pavement material
present and to provide a certified report of the results to the Township
Engineer. The testing laboratory employed and the number and location
of the cores shall be approved by the Township Engineer.