§ 93.1. Definitions.
The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise:
BMPBest management practices
(i) Schedules of activities, prohibitions of practices, maintenance procedures and other management practices to prevent or reduce pollution to surface waters of this Commonwealth.
(ii) The term includes:
(A) Treatment requirements.
(B) Operating procedures.
(C) Practices to control plant site runoff, spillage, or leaks, sludge or waste disposal, or drainage from raw material storage.
CarcinogenA substance that causes an increased incidence in benign or malignant neoplasms, or a substantial decrease in the latency period between exposure and the onset of neoplasms in man or other species as evidenced by toxicological or epidemiololgical studies, or both.
Class A wild trout waterA surface water classified by the Fish and Boat Commission, based on species-specific biomass standards, which supports a population of naturally produced trout of sufficient size and abundance to support a long-term and rewarding sport fishery.
Clean Streams LawThe Clean Streams Law (35 P.S. § § 691.1691.1001).
Clean Water ActThe Federal Water Pollution Control Act (33 U.S.C.A. § § 12511376).
Conventional treatmentFor the purpose of surface water protection of the Potable Water Supply (PWS) use, coagulation, followed by filtration for the removal of solids, and disinfection for the control of pathogens to produce water for drinking and other human consumption.
Coordinated water quality protective measures
(i) Legally binding sound land use water quality protective measures coupled with an interest in real estate which expressly provide long-term water quality protection of a watershed corridor.
(ii) Sound land use water quality protective measures include: surface or groundwater source protection zones, enhanced stormwater management measures, wetland protection zones or other measures which provide extraordinary water quality protection.
(iii) Real estate interests include:
(A) Fee interests.
(B) Conservation easements.
(C) Government owned riparian parks or natural areas.
(D) Other interests in land which enhance water quality in a watershed corridor area.
Daily averageThe arithmetic average of the samples collected during a continuous 24-hour period.
Designated usesThose uses specified in § § 93.4(a) and 93.9a93.9z for each water body or segment whether or not they are being attained.
EpilimnionWarm upper layer of nearly uniform temperature in a stratified body of water, such as a lake or impoundment.
Exceptional Value WatersSurface waters of high quality which satisfy § 93.4b(b) (relating to antidegradation).
Existing usesThose uses actually attained in the water body on or after November 28, 1975, whether or not they are included in the water quality standards.
Four-day averageThe arithmetic average of the samples collected during a consecutive 4-day period.
High Quality WatersSurface waters having quality which exceeds levels necessary to support propagation of fish, shellfish, and wildlife and recreation in and on the water by satisfying § 93.4b(a).
HypolimnionThe cooler, denser, lower layer in a naturally stratified lake, pond or impoundment.
Margin of safetyThe combination of uncertainty and modifying factors applied to the results of toxicity tests to compensate for incomplete characterization of the effect on the population to be protected.
Monthly averageThe arithmetic average on the samples collected during a calendar month.
Natural qualityThe water quality conditions that exist or that would reasonably be expected to exist in the absence of human related activity.
Nonpoint sourceA pollution source which is not a point source discharge.
Nonthreshold effectAn adverse impact, including carcinogenic effects, for which no exposure greater than zero assures protection to the exposed individual.
One-hour averageThe arithmetic average of the samples collected during a continuous 1-hour period.
Osmotic pressureThe pressure which, when applied to a solution, will just prevent the passage of solventusually waterfrom an area of low solute concentration through a semipermeable membrane to an area of high solute concentration.
Outstanding National, State, regional or local resource waterA surface water for which a National or State government agency has adopted water quality protective measures in a resource management plan, or regional or local governments have adopted coordinated water quality protective measures along a watershed corridor.
Point source dischargeA pollutant source regulated under the National Pollutant Discharge Elimination System (NPDES) as defined in § 92a.2 (relating to definitions).
Priority pollutantsThe chemicals identified by the EPA for priority in water pollution control, under section 307(a)(1) of the Clean Water Act (33 U.S.C.A. § 1317(a)(1)).
Risk assessmentThe characterization of the potential adverse effects of exposure to environmental hazards. The term includes hazard identification, dose-response assessment, exposure assessment and risk characterization.
Risk managementThe process of evaluation and selection between alternative regulatory options. Risk management decisions may include consideration of risk assessment, analytical, socio-economic and political factors.
State game propagation and protection areaAn area established by the Game Commission for the propagation and protection of game or wildlife wherein game or wildlife may not be hunted, pursued, disturbed, molested, killed or taken at any time except as authorized by the Game Commission.
Surface water of exceptional ecological significanceA surface water which is important, unique or sensitive ecologically, but whose water quality as measured by traditional parameters (for example, chemical, physical or biological) may not be particularly high, or whose character cannot be adequately described by these parameters. These waters include:
(i) Thermal springs.
(ii) Wetlands which are exceptional value wetlands under § 105.17(1) (relating to wetlands).
Surface water of exceptional recreational significanceA surface water which provides a water-based, water quality-dependent recreational opportunity (such as fishing for species with limited distribution) because there are only a limited number of naturally occurring areas and waterbodies across the State where the activity is available or feasible.
Surface watersPerennial and intermittent streams, rivers, lakes, reservoirs, ponds, wetlands, springs, natural seeps and estuaries, excluding water at facilities approved for wastewater treatment such as wastewater treatment impoundments, cooling water ponds and constructed wetlands used as part of a wastewater treatment process.
Threshold effectAn adverse impact that occurs in the exposed individual only after a physiological reserve is depleted. For these effects there exists a dose below which no adverse response will occur.
Thirty-day averageThe arithmetic average of the samples collected during a consecutive 30-day period.
Toxic substanceA chemical or compound in sufficient quantity or concentration which is, or may become, harmful to human, animal or plant life. The term includes, but is not limited to, priority pollutants and those substances, which are identified in Tables 5 and 6. Additional toxic substances are also described in Chapter 16 Appendix A, Table 1A (relating to site-specific water quality criteria for toxic substances).
WERWater Effect RatioA factor that expresses the difference between the measures of the toxicity of a substance in laboratory water and the toxicity in site water. The WER provides a mechanism to account for that portion of a metal that is toxic under certain physical, chemical or biological conditions.
Water quality criteriaNumeric concentrations, levels or surface water conditions that need to be maintained or attained to protect existing and designated uses.
WetlandsAreas that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions, including swamps, marshes, bogs and similar areas.
Wilderness trout streamA surface water designated by the Fish and Boat Commission to protect and promote native trout fisheries and maintain and enhance wilderness aesthetics and ecological requirements necessary for the natural reproduction of trout.
The provisions of this § 93.1 amended under sections 5(b)(1) and 402 of The Clean Streams Law (35 P. S. § § 691.5(b)(1) and 691.402); and section 1920-A of The Administrative Code of 1929 (71 P. S. § 510-20).
The provisions of this § 93.1 amended May 30, 1980, effective May 31, 1980, 10 Pa.B. 2157; amended March 10, 1989, effective March 11, 1989, 19 Pa.B. 968; amended February 11, 1994, effective February 12, 1994, 24 Pa.B. 832; amended December 26, 1997, effective December 27, 1997, 27 Pa.B. 6799; amended July 16, 1999, effective July 17, 1999, 29 Pa.B. 3720; amended November 17, 2000, effective November 18, 2000, 30 Pa.B. 6059; amended February 11, 2005, effective February 12, 2005, 35 Pa.B. 1197; amended May 15, 2009, effective May 16, 2009, 39 Pa.B. 2523; amended July 19, 2013, effective July 20, 2013, 43 Pa.B. 4080. Immediately preceding text appears at serial pages (352671) to (352672), (343937) to (343938) and (354307).
This section cited in 25 Pa. Code § 250.309 (relating to MSCs for surface water); 25 Pa. Code § 250.406 (relating to relationship to surface water quality requirements); 25 Pa. Code § 290.102 (relating to use as structural fill); 25 Pa. Code § 290.103 (relating to use as a soil substitute or soil additive); 25 Pa. Code § 290.105 (relating to beneficial use at abandoned mine lands); and 25 Pa. Code § 290.404 (relating to areas where coal ash storage is prohibited).
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