<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>D. E. Hillier</dc:contributor>
  <dc:contributor>Edward Nickum</dc:contributor>
  <dc:contributor>W.G. Dorrance</dc:contributor>
  <dc:creator>Dennis C. Hall</dc:creator>
  <dc:date>1981</dc:date>
  <dc:description>The use of residential wastewater-treatment systems in Evergreen Meadows, Marshdale, and Herzman Mesa, Colo., has degraded ground-water quality to some extent in each community. Age of community; average lot size; slope of land surface; composition, permeability, and thickness of surficial material; density, size , and orientation of fractures; maintenance of wastewater-treatment systems; and presence of animals are factors possibly contributing to the degradation of ground-water quality. When compared with effluent from aeration-treatment tanks, effluent fom septic-treatment tanks is characterized by greater biochemical oxygen demand and greater concentrations of detergents. When compared with effluent from septic-treatment tanks, effluent from aeration-treatment tanks is characterized by greater concentrations of dissolved oxygen, nitrite, nitrate, sulfate, and dissolved solids. (USGS)</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/ofr8173</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey,</dc:publisher>
  <dc:title>Effects of residential wastewater treatment systems on ground-water quality in west-central Jefferson County, Colorado</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>