Chemical Mixtures and Environmental Effects
Before and after photos of Fourmile Creek near Ankeny, Iowa, showing a wastewater outfall from a wastewater treatment facility (WWTF). The top photo is the creek before the WWTF
was closed, and the bottom photo is after the WWTF
was shutdown. After the shutdown
flow in the creek decreased significantly. Photo credits: Laura E. Hubbard, USGS
, Layout by David W. Morganwalp, USGS
USGS scientist collecting water samples and measuring water field properties at North Sylamore Creek, Arkansas, on January 7, 2014. The site is a reference site in a pilot study to assess chemical mixtures in U.S. streams
. More than 60 samples bottles were filled at each stream site and shipped to USGS and EPA laboratories across the Nation for biological and chemical testing. Photograph by John Tyler Mays, USGS.
Swiftcurrent Creek, Montana, was sampled on August 28, 2013, as part of a pilot study to assess chemical mixtures
and biological activity in stream waters. This site was an undeveloped watershed (reference site) in the study's sampling plan. The view in the photograph is looking upstream at the sampling location.
USGS scientist measures discharge at sampling site on the Blue River, near Kansas City, Missouri. The 184.2 square mile drainage area is 41.4 percent urban and 29 percent agricultural land use with a population density of 1,696 people per square mile. This site was part of a pilot study to assess chemical mixtures and biological activity in stream waters
. Photo taken on February 11, 2014. Photo credit: USGS.
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