Key Research Resources
Independent Aggregate Mining Research & Technical Reports
STEP would like to recognize and thank Norvell Township for making these research materials available to the public.
We also extend our appreciation to the professionals and authors responsible for the McKenna Impact Report, American Aggregates – Grobbel Report, and Pangea Hydrogeological Report. These documents provide residents with additional technical information and analysis concerning aggregate mining and its potential impacts.
The original reports are provided below so residents can review the research and supporting analysis directly.
McKenna Impact Report
Impact report dated August 31, 2026. This document is part of the collection of aggregate-mining research made available through Norvell Township.
View McKenna Impact ReportAmerican Aggregates – Grobbel Report
Report dated September 4, 2026 concerning American Aggregates and prepared as part of the technical materials associated with the Norvell Township matter.
View Grobbel ReportPangea Hydrogeological Report
Hydrogeological report dated May 9, 2026. This report provides technical information relating to groundwater and hydrogeological considerations associated with the project.
View Pangea Hydrogeological ReportCrystalline Silica Health Effects – OSHA
Explore detailed information from OSHA on how exposure to crystalline silica can impact health, including links to long-term illness and prevention strategies.
Read OSHA Health Effects PageSilica Exposure Fact Sheet
Learn more about the health risks associated with silica dust exposure as outlined by the Mine Safety and Health Administration.
View MSHA Silica Fact Sheet (PDF)Respiratory Health & Gravel Mining – PMC
Peer-reviewed analysis of the health effects of airborne particulates and dust from gravel mining operations.
Read the Full PMC ArticleTraffic Noise and Dementia Risk – Harvard Health
Research from Harvard showing exposure to traffic and environmental noise is linked to higher dementia risk, relevant for communities near gravel mining haul routes.
Read Harvard Health ArticleBHHC Letter
Official correspondence regarding the gravel mining issue from the BHHC organization.
Read the BHHC Letter (PDF)