Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 41
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146 Introduction
ASPHALT CONCRETE PLANTS - SUBPART I
§
60 • 90 - 60. 93
The facilities affected uhdet this subpart are those which comprise an
asphalt concrete plant, which is used to manufacture asphalt concrete by heat-
ing and drying aggregate and mixing with asphalt cements.
An
asphalt concrete
plant is comprised of any combination of the following:
dryers, systems for
screening, handling, storing, and
~eighing
hot aggregate; systems for loading,
transferring, and storing mineral filler; systems for mixing asphalt concrete;
and the loading, transfer, and storage systems associated with emission con-
trol systems.
Affected facilities which commence construction, reconstruction or modifi-
cation aftet June 11, 1973, are subJect to the requirements of this subpart.
Those requirements state that no owner or operator of an asphalt concrete
plant shall discharge or cause the discharge into the atmosphere from any
affected facility any gases which:
1.
Contain particulate matter in excess of 90 mg/dscm
(0.04 gr/dsct),
2.
Exhibit 20 percent opacity or greater.
ProcesR bescriptiori
Asphalt Cbncrete p1ants are generaliy classified as a widespread jobbing
operation.
A large majority of the piatlts operate on a seasonal basis, nor-
maliy during the warm months of the year.
Within the industry there are
portable and permanerit plants.
Most
bf
the p1ants are of the permanent type,
primarliy located itl or ,around urban
at~as
were there is a constant market for
their product.
Portable piants are gerterallYmbved to the job site of large
construction ptojects.
Plant operations at a portable source tend to be more
sporadic than permarlent
plan~s
because they depend on work at a field site.
Permanent plants tend to
produc~
most of their asphalt,concrete for Federal,
state and local
high~ay
departments.
The tRW materials \tsed in an aspha1t batch plant are the aggregate,
asphalt cement, and possibly minetal filler.
Paving ndxes are produced for
different uses with correspondingly different characteristics, which are
primarily determined by the aggregate size distribution.
The three main
distributions are coarse aggregate (retained on No.8 mesh sieve), fine ag-
gregate (passing through a No.8 mesh sieve), and mineral dust (passing through
a No. 200 mesh sieve).
The coarse aggregate can be as large as
6.4
em
(2~
in.) in
29
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