New Jersey Administrative Code › Title 7 - ENVIRONMENTAL PROTECTION › Chapter 14A - NEW JERSEY POLLUTANT DISCHARGE ELIMINATION SYSTEM › Subchapter 24 - ADDITIONAL REQUIREMENTS FOR CERTAIN STORMWATER DISCHARGES › Section 7:14A-24.8 - Sample collection procedures for individual stormwater DSW permit applications

Current through Register Vol. 56, No. 14, July 15, 2024
(a) When
				"quantitative data" for a pollutant are required under
				7:14A-24.7(a)1 
				viii (or under
				7:14A-25.10(a) 
				and
				40
				C.F.R. 122.26(d)(2)(iii) )
				in an individual NJPDES permit application for a stormwater DSW, the applicant
				shall collect samples in accordance with
				7:14A-4.4(b) 
				(also see 7:14A-24.7(a)1  x)
				and the following paragraphs (procedures or requirements in (a)1 through 4
				below are subject to change under (a)5 below):
1. All samples shall be collected from the
				discharge resulting from a storm event that is greater than 0.1 inch and at
				least 72 hours from the previously measurable (greater than 0.1 inch) storm
				event. Where feasible, the variance in the duration of the event and the total
				rainfall of the event should not exceed 50 percent from the average or median
				rainfall event in that area.
2. For
				all pollutants requiring analysis under N.J.A.C. 7:14A-24.7, quantitative data
				must be reported for a grab sample taken during the first 30 minutes (or as
				soon thereafter as practicable) of the stormwater discharge.
3. For all pollutants requiring analysis
				under 7:14A-24.7 (or under N.J.A.C.
				7:14A-25.10, where applicable), quantitative data must be reported for a
				flow-weighted composite sample (except as provided in (a)3i and ii below). This
				sample must be taken for either the entire stormwater discharge or for the
				first three hours of the stormwater discharge. (Notwithstanding
				7:14A-4.4(b)2  ii,
				a 24-hour composite sample of the stormwater discharge is not required.) Only
				one analysis of the composite of aliquots is required.
i. A minimum of one grab sample may instead
				be taken for stormwater discharges from holding ponds or other impoundments
				with a retention period greater than 24 hours.
ii. Flow-weighted composite samples shall not
				be taken for pH, temperature, cyanide, total phenols, chlorine produced
				oxidants, oil and grease, petroleum hydrocarbons, all volatile organics, and
				fecal coliform, fecal streptococcus, and other bacterial indicators.
iii. The flow-weighted composite sample shall
				be:
(1) Taken with a continuous
				sampler;
(2) A combination of a
				minimum of three sample aliquots taken in each hour of discharge for the entire
				discharge; with each aliquot being separated by a minimum period of fifteen
				minutes; or
(3) A combination of a
				minimum of three sample aliquots taken in each of the first three hours of the
				discharge, with each aliquot being separated by a minimum period of 15
				minutes.
4.
				Notwithstanding
				7:14A-4.4(b)5  ii,
				stormwater permit applicants are not required to report the daily maximum or
				daily average for any pollutant. Notwithstanding
				7:14A-4.4(b)3  vi,
				stormwater permit applicants are not required to report as total mass:
i. Any sampling data from grab samples;
				or
ii. Any sampling data for flow,
				or for any pollutants that cannot be appropriately expressed in terms of mass
				(including, but not limited to, pH, acute and chronic whole effluent toxicity,
				temperature, and fecal coliform, fecal streptococcus, and other bacterial
				indicators).
5. The
				Department may allow or establish (in the Pollutant Analysis Summary in NJPDES
				Form RF or elsewhere) appropriate site-specific sampling procedures or
				requirements, including:
i. Sampling
				locations, the season in which the sampling takes place, the minimum duration
				between the previous storm event and the storm event sampled, the minimum or
				maximum level of precipitation required for an appropriate storm event, and the
				form of precipitation sampled (snowmelt or rainfall); and
ii. The type of sampling (for example, grab
				sample or flow-weighted composite sample), whether and how to measure (or
				estimate) and report flow, protocols for collecting samples that may differ
				from protocols for collecting samples under 40 C.F.R. 136 or N.J.A.C. 7:18,
				time duration between the collection of sample aliquots in flow-weighted or
				other composite samples, mode of reporting sampling results (for example,
				concentration or loading) or other sampling or storm event information, and
				additional time for submitting data on a case-by-case basis.