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Development and Research: Hexavalent Chromium Field Speciation Method CLICK PHOTOS FOR AN ENLARGED VERSION
Hexavalent chromium field speciation supplies	Hexavalent chromium field separation	USGS scientists collecting water from Sheep Creek, which drains the San Gabriel Mountains toward the Sheep Creek Fan
Close-up of the mafic Pelona Schist, the formation that is a potential source of chromium contamination in the aquifer underlying the Sheep Creek Fan, California	USGS mobile laboratory truck on site at Edwards Air Force Base, California	Inside view the USGS's mobile laboratory truck showing instrumentation for the on site determination of chromium VI with an ion chromatograph (EPA Method 218.6)
USGS scientist working in the mobile laboratory truck at Edwards Air Force Base, California	USGS scientists collecting and processing ground-water samples at Edwards Air Force Base, California	USGS scientist measuring on-site parameters of ground water samples at Edwards Air Force Base, California
USGS scientist collecting a well sample at 29 Palms Marine Base, California

U.S. Department of the Interior | U.S. Geological Survey
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Development and Research: Hexavalent Chromium Field Speciation Method