New York Codes, Rules and Regulations
Title 21 - Miscellaneous
Chapter XVIII - Delaware River Basin Commission
Subchapter B - Water Quality Regulations
Part 860 - Water Quality Standards For The Delaware River Basin (article 3)
Basinwide Surface Water Quality Standards
Section 860.6 - Definitions

Universal Citation: 21 NY Comp Codes Rules and Regs ยง 860.6

Current through Register Vol. 46, No. 39, September 25, 2024

(a) Biochemical oxygen demand. Biochemical oxygen demand as determined under standard laboratory procedures for 5 days at 20° C.

(b) Carbonaceous oxygen demand. That part of the ultimate oxygen demand associated with biochemical oxidation of carbonaceous, as distinct from nitrogenous material.

(c) Effective disinfection. The destruction of pathogenic organisms in such manner and under such controls as shall be prescribed by commission regulations.

(d) Secondary treatment.

(1) The removal of practically all suspended solids at all times.

(2) The reduction of the biochemical oxygen demand by at least 85 percent; the 85 percent reduction may be modified, upon application for dilute industrial process wastewater.

(3) May include the in-plant control of industrial wastes as prescribed by the commission.

(e) River mile. The distance, in statute miles, of a location or item measured from "mile zero."

(1) Delaware Bay and River.
(i) Mile zero is located at the intersection of the centerline of the navigation channel and a line between the Cape May Light and the tip of Cape Henlopen.

(ii) Distances from mile zero are measured essentially along the centerline of the navigation channel up to the Trenton-Morrisville Toll Bridge (RM 133.4) and above that point along the State boundary line as shown on published quadrangle maps of the United States Geological Survey.

(2) Tributaries.
(i) Mile zero is located at the intersection of the centerline of the tributary and a line joining the opposite banks at its mouth.

(ii) Distances from mile zero are measured along the centerline of the tributary.

(f) Intermittent streams. A stream is intermittent when it meets either of the following conditions:

(1) a stream with less than a 0.1 cfs minimum consecutive 7-day natural flow with a 10-year recurrence interval; or

(2) a ditch, canal or natural watercourse which serves only to convey runoff during and after a storm.

(g) Background, total dissolved solids. The observed concentration of total dissolved solids during low flow conditions or, in the absence thereof, an estimate acceptable to the commission.

(h) IRIS The Integrated Risk Information System established and maintained by the U.S. Environmental Protection Agency. An electronic data base containing information on the toxicity and carcinogenicity of individual substances which can be accessed by regulatory agencies and the public.

(i) Carcinogen. A substance for which there is no level of exposure that does not pose a small, finite probability of inducing benign or malignant tumors.

(j) Systemic toxicant. A substance having a threshold exposure which must be exceeded before deleterious effects (other than cancer) are observed in organ systems.

(k) Acute effects. Effects (including but not limited to lethality) due to exposure to a toxicant over a short time period.

(l) Chronic effects. Effects (including but not limited to reduced reproduction, reduced growth and lethality) due to exposure to a toxicant over a relatively long period of time relative to the life span of the exposed organism.

(m) Cancer potency factor (CPF). The slope of the dose response curve in the low dose region expressed as the risk per milligram of a toxic substance per kilogram of body weight per day (mg/KG/day)-1.

(n) Reference dose (RfD). The daily exposure to a substance that is likely to be without an appreciable risk of deleterious effects during a lifetime expressed as milligram of the substance per kilogram of body weight per day (mg/KG/day).

(o) Maximum contaminant level (MCL). The maximum permissible level of a contaminant in water which is delivered to any user of a public water system.

(p) Stream quality objectives. Numeric values for specific pollutants and narrative descriptions of the quality of a waterbody that will assure that the designated uses of the waterbody, including the protection of aquatic life and human health, are achieved.

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