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RECORD NUMBER: 31 OF 66

OLS Field Name OLS Field Data
Main Title Mineralogical study of boreholes B98-13 and B98-12 Frontier Hard Chrome Site, Vancouver, Washington
Author Frank, D.
CORP Author Environmental Protection Agency, Seattle, WA. Region X.
Publisher U.S. Environmental Protection Agency, Office of Environmental Assessment,
Year Published 1999
Report Number EPA 910-R-99-015
Stock Number PB99-172744
OCLC Number 42403824
Subjects Groundwater--Sampling
Additional Subjects Mineralogy ; Boreholes ; Chromium ; Chlorite ; Clay mineral ; Electron microprobe ; Geochemistry ; Metal mobility ; X ray diffraction
Internet Access
Description Access URL
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P100ORJH.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
ESAD  EPA 910-R-99-015 2 copies Region 10 Library/Seattle,WA 06/13/2016
NTIS  PB99-172744 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation 1 v. (various pagings) : ill. ; 28 cm.
Abstract
One factor in assessing metal mobility at the Frontier Hard Chrome industrial site is the degree of chromium reduction and secondary mineralization in a silt unit and underlying sand and gravel aquifer that extends from the site toward the Columbia River. Samples were analyzed by ICP-AES for metals concentration, scanning electron microscopy/electron microprobe for mineralogical texture and microanalysis, powder x-ray diffraction for mineral identification, and optical microscopy for textural observations. Microprobe analysis showed that chromium occurred in metallic particles originating in an uppermost Fill Unit, and in iron oxides, iron-titanium oxides and fine-grained iron aluminun silicates in the both the Silt and Aquifer Units. X-ray diffraction analysis showed that the fine-grained fraction of the Silt and Aquifer Units contained an abundant suite of detrital clay minerals including primarily illite, chlorite, and smectite, and lesser kaolinite. The presence of chlorite and smectite is consistent with the microprobe observation of iron-bearing aluminum silicates in the fine grained fraction of the samples. Chromium concentration in the fine-grained material was elevated to a level consistent with chromium in the bulk material and about 10-20 times nearby background concentrations, suggesting that an important contributor to the bulk chromium content resides in the clay minerals.
Notes
"EPA 910-R-99-015." "August, 1999." Bibliographic references included.