This page contains documents related to EPA's approval of Interstate Concrete and Asphalt dba Columbia Asphalt & Ready-Mix’s request for coverage under the general air quality permit for new or modified minor source stone quarrying, crushing and screening facilities in Indian Country (SQCS General Permit) for a portable plant at 441 E McDonald Road (Toppenish Quarry), Toppenish, Washington on the Yakama Nation Lands.
The EPA approved Columbia Asphalt & Ready-Mix’s request for coverage on May 28, 2019. The approval became effective upon issuance.
For a copy of the general permit and related documents, visit Stone Quarrying, Crushing and Screening Facilities (Final Rule).
Approval Documents
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Approval of Request for Coverage: Columbia Asphalt & Ready-Mix (portable SQCS plant) - Toppenish Quarry (PDF)(4 pp, 56 K,
May 28, 2019)
EPA's approval of coverage under the SQCS General Permit.
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Technical Support Document for Approval of Request for Coverage: Columbia Asphalt & Ready-Mix (portable SQCS plant) - Toppenish Quarry (PDF)(8 pp, 246 K,
May 28, 2019)
Technical information supporting EPA's approval of coverage.