In the case where lots created within a subdivision are large
enough to accommodate either further subdivision or a high density
of development and thus may result in higher traffic levels, the Borough
may require that additional right-of-way be provided to permit the
future development of a higher-order street.
All materials entering into the construction of streets and
the methods of construction and drainage shall be in accordance with
the applicable requirements of the Pennsylvania Department of Transportation
Specifications, Form 408, or the latest revision thereof. Road cross
sections shall be as detailed as the example which is shown in the
appendix.
A. Subgrade.
(1) The area within the limits of the proposed road surface shall be
shaped to conform to the line, grade and cross section of the proposed
road.
(2) Remove or stabilize all unsuitable subgrade materials.
(3) Wet or swampy areas shall be permanently drained and stabilized.
(4) Fills shall be made with suitable materials and thoroughly compacted
for full width in uniform layers not more than eight inches thick.
(5) The subgrade shall be thoroughly compacted by rolling with a minimum
ten-ton roller and/or a sheepsfoot roller over six inches.
(6) Backfill of trenches within the cartway and curb areas shall be thoroughly
compacted prior to application of the base course.
B. Base course.
(1) The base course shall consist of eight inches of PA No. 4A crushed
stone placed on a two-inch initial layer of screenings and rolled
uniformly and thoroughly with a ten-ton roller. Rolling shall continue
until the material does not creep or wave ahead of the roller wheels.
(2) After compaction of the base stone, dry screenings shall be applied
in sufficient quantity to fill all of the voids in the rolled stone
base. A vibratory roller of Pennsylvania Department of Transportation
approved design must be used in this step of construction, and rolling
shall continue until all voids are filled. Small areas around inlets
and manholes that cannot be reached by the vibratory roller shall
be compacted with a mechanical tamper or whacker.
(3) When the stone surface is tight and will accept no more screenings,
all loose screening shall be broomed from the surface to expose the
top 1/2 inch of the aggregate over at least 75% of the road.
(4) No base materials shall be placed on a wet or frozen subgrade.
(5) As an alternate, an aggregate-lime-pozzolan base course may be used
when approved by the Borough. This possopac base course must be applied
with an approved paver to a thickness to be determined by the Borough
Engineer.
(6) Application of the possopac base course shall be followed immediately
by application of the binder course.
C. Bituminous surface.
(1) Bituminous material shall be ID-2 or FB-1 hot mix, with two inches
of binder course and one inch of surface course after compaction.
(2) The completed road surface shall have a uniform slope of 1/4 inch
per foot from edge to center line, except that on superelevated curves,
this slope shall not be less than 1/4 inch per foot and shall extend
from the inside edge to the outside edge of the paving.
(3) As an alternate, the road may be constructed of six inches of compacted
aggregate bituminous base course and 1 1/2 inches of wearing
course. The type and installation of road material shall be equal
or superior to that required in the Pennsylvania Department of Transportation
Specifications, Form 408.
D. Grading and shoulders.
(1) Roadways shall be graded for not less than eight feet beyond the
edge of the proposed paving on each side. This grading width shall
be increased as necessary where sidewalks and/or planting strips are
to be provided. Shoulders shall be graded with a slope of one inch
per foot. Beyond the limits of this grading, banks shall be sloped
to prevent erosion, but this slope shall not exceed two horizontal
to one vertical with tops of slope in cuts rounded.
(2) The Borough Council may modify the two-to-one ratio relative to site
conditions where a cut to attain the maximum grade for a road exceeds
eight feet.
Parking spaces shall be provided in accordance with Chapter
213, Zoning. Parking spaces shall be constructed of a durable all-weather material. Where such access is to other than a residential service street, adequate turnaround space shall be provided on the lot so that egress to the street is in a forward direction. Parking areas shall be provided for commercial and industrial uses as required by the Council. Reference should be made to Chapter
213, Zoning.