Prepared for U.S. Environmental Protection Agency Region 9 IAG DW1492190501-2
Mineralogy and Morphology of Amphiboles Observed in Soils and Rocks in El Dorado Hills, California
By G.P. Meeker, H.A. Lowers, G.A. Swayze, B.S. Van Gosen, S.J. Sutley, and I.K. Brownfield
Open-File Report
PDF (6 MB)
Right-Click to 'Save As' or 'Download'
From the Executive Summary
At the request of the U.S. Environmental Protection Agency (USEPA), the U.S. Geological Survey (USGS) has conducted an independent study of amphiboles in rocks and soils in the El Dorado Hills, California, area. The purpose of this study is to investigate specific issues regarding the presence of “naturally occurring asbestos” raised by an USEPA activity-based sampling study and subsequent criticisms of that study outlined in a review prepared by The R.J. Lee Group (RJLG).
An aerial photo map of the El Dorado Hills study area showing USGS sampling locations (Figure A1) and a spreadsheet with sampling site descriptions (Table A1).
A spreadsheet that includes tables of EPMA data, SEM data, and size data for particles analyzed in sample ED06-07A.
Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Acrobat Reader or similar software is required to view it. Download the latest version of Acrobat Reader, free of charge or go to access.adobe.com for free tools that allow visually impaired users to read PDF files.
