This animation illustrates how a standard Polychem chain and flight scraper system is assembled and installed.
Agency to hold public listening sessions
The U.S. Environmental Protection Agency (EPA) will hold two public listening sessions on potential changes to the water quality standards regulation before proposing a national rule.The current regulation, which has been in place since 1983, governs how states and authorized tribes adopt standards needed under the Clean Water Act (CWA) to protect the quality of their rivers, streams, lakes and estuaries. Potential revisions include strengthening protection for water bodies with water quality that already exceeds or meets the interim goals of the CWA; ensuring that standards reflect a continued commitment to these goals wherever attainable; improving transparency of regulatory decisions; and strengthening federal oversight.Water quality standards are the foundation of the water quality-based approach to pollution control, including total maximum daily loads and National Pollutant Discharge Elimination System permits. Standards are also a fundamental component of watershed management.The public listening sessions will be held via audio teleconferences on Aug. 24 and 26, from 1 to 2:30 p.m. EST. At the sessions, the EPA will provide a review of the current regulation and a summary of the revisions it is considering. Clarifying questions and brief oral comments (three minutes or less) from the public will be accepted at the sessions, as time permits.The EPA will consider the comments received as it develops the proposed rulemaking. The agency will hold separate listening sessions for state, tribal and local governments and expects to publish the proposed revisions to the water quality standards regulation in Summer 2011.For more information, visit www.epa.gov/waterscience/standards/rules/wqs/.