EPA announced availability of a document titled, "Regional Monitoring Networks (RMNs) to Detect Changing Baselines in Freshwater Wadeable Streams," which was prepared by the National Center for Environmental Assessment and describes the development of the current RMNs for riffle-dominated, freshwater wadeable streams.

EPA announced availability of a document titled, "Regional Monitoring Networks (RMNs) to Detect Changing Baselines in Freshwater Wadeable Streams," which was prepared by the National Center for Environmental Assessment and describes the development of the current RMNs for riffle-dominated, freshwater wadeable streams.

EPA announced availability of a document titled, "Regional Monitoring Networks (RMNs) to Detect Changing Baselines in Freshwater Wadeable Streams," which was prepared by the National Center for Environmental Assessment and describes the development of the current RMNs for riffle-dominated, freshwater wadeable streams.

EPA proposed to add a subsurface intrusion component to the hazard ranking system, the principal mechanism that EPA uses to evaluate sites for placement on the national priorities list, to allow human exposure to hazardous substances, pollutants, or contaminants that enter regularly occupied structures through subsurface intrusion to be considered in assessing a site's relative risk.

EPA proposed to add a subsurface intrusion component to the hazard ranking system, the principal mechanism that EPA uses to evaluate sites for placement on the national priorities list, to allow human exposure to hazardous substances, pollutants, or contaminants that enter regularly occupied structures through subsurface intrusion to be considered in assessing a site's relative risk.

EPA proposed to add a subsurface intrusion component to the hazard ranking system, the principal mechanism that EPA uses to evaluate sites for placement on the national priorities list, to allow human exposure to hazardous substances, pollutants, or contaminants that enter regularly occupied structures through subsurface intrusion to be considered in assessing a site's relative risk.

SIP Proposal: Virginia (revisions to PSD air quality preconstruction permitting program to be consistent with federal regulations).

SIP Proposal: Virginia (revisions to PSD air quality preconstruction permitting program to be consistent with federal regulations).

SIP Proposal: Virginia (revisions to PSD air quality preconstruction permitting program to be consistent with federal regulations).

SIP Proposal: Rhode Island (infrastructure requirements for the 1997 fine particle matter (PM), 2006 fine PM, 2008 lead, 2008 ozone, 2010 nitrogen dioxide, and 2010 sulfur dioxide NAAQS, as well as other approvals, disapprovals, and corrections).