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Rock Hill Quarry

This page was last updated on March 5, 2021

The Rock Hill Quarry, owned by Hanson Aggregates PA, LLC, located in East Rockhill Township, Bucks County, has been active since it was first permitted in 1976. In 2017, R.E. Pierson was awarded a contract from the Pennsylvania Turnpike Commission for turnpike construction projects and was the contract operator of the Rock Hill Quarry. In May 2020, Hanson and Pierson terminated their contract; Hanson will remain the owner/permittee, while Pierson will no longer operate at this site.

Information concerning applications, approval, and ongoing asbestos investigation associated with the quarry can be found below. Additional related documents may be found in DEP files maintained at the Pottsville District Mining or Southeast Regional Office. For more information on scheduling a file review, please visit DEP's Public Records page.

Site Facts

Municipality: East Rock Hill Township
Permitted Since: 1976
Owner: Hanson Aggregates PA, LLC
Permits Currently Issued:
1. Surface Mining Permit (requires modification)
2. NPDES Permit (renewed November 2018; under appeal here)

Current Status

As of December 21, 2020, mining and related activities remain under a cessation order.

On December 5, 2018, DEP was notified of a positive asbestos test result from a sample of rock collected at the Quarry. DEP immediately ordered the cessation of all mining, rock crushing, sizing, and other related activities. The cessation will remain in effect until rescinded, in writing, by DEP. More information regarding the asbestos investigation can be found below. The cessation refers to quarrying activities; some activities, such as sampling, monitoring, and inspections may still be observable.

At this time, the long-term future of the Rock Hill Quarry is still undetermined. DEP must work with the property owner to assess potential future options for the site, while continuing to investigate and assess the presence of Naturally Occurring Asbestos.

As DEP works with the current owner/permittee to collect additional necessary data, the department is continuing to evaluate all available information and resources, including that which has been shared by stakeholders, sister agencies, and the community. The health and safety of residents, employees, and the environment remains a top priority and DEP is committed to continued transparency as the future of the site is evaluated.

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Non-Coal Surface Mining

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Non-Coal Surface Mining – Naturally Occurring Asbestos Investigation


The Rock Hill Quarry is large noncoal surface mine. The mineral actinolite, which can sometimes contain asbestos fibers has been found at the site. The Department has therefore required testing and investigations to determine if actual asbestos fibers are present within the rock being mined and in future mining areas. The initial and subsequent investigation and sampling did not identify asbestos. However, in December 2018, a rock sample tested positive for asbestos fibers. The Department, upon notice of the positive sample analysis, ceased all mining and crushing activities at the site, and they remain ceased at this time. The Department also required additional testing, sampling and investigation be undertaken at the site; and a plan outlining that proposed work will be submitted to the Department.


On March 4 and 5, 2021, DEP received comments from Dr. Bradley Erskine of Erskine Environmental Consulting, Inc. (EEC) and the Rockhill Environmental Preservation Alliance Inc. (REPA) regarding Hanson’s 1/15/21 response to DEP’s 11/18/20 technical deficiency letter.

On February 22, 2021, East Rockhill Township submitted comments to DEP regarding Hanson’s response to DEP’s 11/18/20 technical deficiency letter.

On February 9, 2021, the Pennsylvania Aggregates and Concrete Association (PACA) provided DEP with the National Stone, Sand, and Gravel Association’s (NSSGA) Mineral Identification and Management Guide for Naturally occurring Asbestos (NOA) and a “clarification” response to the DOH letter regarding NOA at Rock Hill Quarry.

On January 18, 2021, The Rockhill Environmental Preservation Alliance, Inc. (REPA) sent an acknowledgement letter to DEP in response to its 12/22/20 letter regarding Hanson’s requirement to remove 500 tons/year of material.

On January 15, 2021, Hanson submitted a response to the technical deficiency letter DEP sent Hanson on 11/18/20, requesting additional and updated information regarding operations at the site.

On January 13, 2021, East Rockhill Township sent a letter to DEP reiterating concerns about the 500 ton/year removal requirement, DEP’s letter to Hanson on 12/22/20, and Hanson’s characterization of this issue in its 10/9/2020.

On January 5, 2021, DEP denied Hanson Aggregates Pennsylvania, LLC’s request for an extension to provide a response to DEP’s 11/18/20 Technical Deficiency Letter

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Non-Coal Surface Mining - Inspection Reports

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Non-Coal Surface Mining – NPDES

On January 26, 2018, DEP received 4th Quarter 2017 NPDES Discharge Monitoring Reports from Hanson Aggregates PA.

Air Quality

There are no active Air Quality permits issued for this site; past involvement with R.E. Pierson is now null. All historical information has been archived below.

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