40 CFR 503.31 - Special definitions.

§ 503.31 Special definitions.
(a) Aerobic digestion is the biochemical decomposition of organic matter in sewage sludge into carbon dioxide and water by microorganisms in the presence of air.
(b) Anaerobic digestion is the biochemical decomposition of organic matter in sewage sludge into methane gas and carbon dioxide by microorganisms in the absence of air.
(c) Density of microorganisms is the number of microorganisms per unit mass of total solids (dry weight) in the sewage sludge.
(d) Land with a high potential for public exposure is land that the public uses frequently. This includes, but is not limited to, a public contact site and a reclamation site located in a populated area (e.g, a construction site located in a city).
(e) Land with a low potential for public exposure is land that the public uses infrequently. This includes, but is not limited to, agricultural land, forest, and a reclamation site located in an unpopulated area (e.g., a strip mine located in a rural area).
(f) Pathogenic organisms are disease-causing organisms. These include, but are not limited to, certain bacteria, protozoa, viruses, and viable helminth ova.
(g) pH means the logarithm of the reciprocal of the hydrogen ion concentration measured at 25 °Centigrade or measured at another temperature and then converted to an equivalent value at 25 °Centigrade.
(h) Specific oxygen uptake rate (SOUR) is the mass of oxygen consumed per unit time per unit mass of total solids (dry weight basis) in the sewage sludge.
(i) Total solids are the materials in sewage sludge that remain as residue when the sewage sludge is dried at 103 to 105 degrees Celsius.
(j) Unstabilized solids are organic materials in sewage sludge that have not been treated in either an aerobic or anaerobic treatment process.
(k) Vector attraction is the characteristic of sewage sludge that attracts rodents, flies, mosquitos, or other organisms capable of transporting infectious agents.
(l) Volatile solids is the amount of the total solids in sewage sludge lost when the sewage sludge is combusted at 550 degrees Celsius in the presence of excess air.
[58 FR 9387, Feb. 19, 1993, as amended at 64 FR 42571, Aug. 4, 1999]

Title 40 published on 2013-07-01

no entries appear in the Federal Register after this date.

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

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United States Code
U.S. Code: Title 33 - NAVIGATION AND NAVIGABLE WATERS

§ 1251 - Congressional declaration of goals and policy

§ 1252 - Comprehensive programs for water pollution control

§ 1252a - Reservoir projects, water storage; modification; storage for other than for water quality, opinion of Federal agency, committee...certain prescribed water quality benefits in relation to total project benefits

§ 1253 - Interstate cooperation and uniform laws

§ 1254 - Research, investigations, training, and information

§ 1254a - Research on effects of pollutants

§ 1255 - Grants for research and development

§ 1256 - Grants for pollution control programs

§ 1257 - Mine water pollution control demonstrations

§ 1257a - State demonstration programs for cleanup of abandoned mines for use as waste disposal sites; authorization of appropriations

§ 1258 - Pollution control in the Great Lakes

§ 1259 - Training grants and contracts

§ 1260 - Applications; allocation

§ 1261 - Scholarships

§ 1262 - Definitions and authorizations

§ 1263 - Alaska village demonstration projects

§ 1263a - Grants to Alaska to improve sanitation in rural and Native villages

§ 1264 - Omitted

§ 1265 - In-place toxic pollutants

§ 1266 - Hudson River reclamation demonstration project

§ 1267 - Chesapeake Bay

§ 1268 - Great Lakes

§ 1269 - Long Island Sound

§ 1270 - Lake Champlain Basin Program

§ 1271 - Sediment survey and monitoring

§ 1271a - Research and development program

§ 1272 - Environmental dredging

§ 1273 - Lake Pontchartrain Basin

§ 1274 - Watershed pilot projects

§ 1345 - Disposal or use of sewage sludge

Title 40 published on 2013-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 503 after this date.

  • 2013-10-29; vol. 78 # 209 - Tuesday, October 29, 2013
    1. 78 FR 64435 - Extension of Comment Period for the NPDES Electronic Reporting Rule
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Proposed rule; extension of comment period.
      Comments on the preliminary plan published on July 30, 2013 (78 FR 46006), will be accepted through December 12, 2013. Comments provided electronically will be considered timely if they are submitted by 11:59 p.m. Eastern Time on December 12, 2013.
      40 CFR Parts 122, 123, 127, 403, 501, and 503