N.J. Admin. Code § 7:14A-23.14 - Measuring, recording, and sampling requirements at treatment plants

(a) At treatment plants, a means for continuous measuring, indicating and recording of the sewage flows shall be installed.

(b) Meters shall be installed in such a manner and location so as to provide a true indication of actual flow.

(c) All wastewater treatment plant designs shall include provisions in terms of number and location for sampling and monitoring as required by its NJPDES permits, Sludge Quality Assurance Reports, Bioassay, and Local Pretreatment Discharge Limits.

1. At a minimum, all wastewater treatment facilities shall be designed and constructed to provide for the collection of representative samples as follows:

i. Influent quality before introduction of recycled waste which may be incorporated within the wastewater facility's processes (for example, wastewater quality prior to introduction of supernatant from sludge thickening or digestion and prior to the introduction of scrubber water from sludge incineration etc.);

ii. Effluent quality after the last treatment plant unit at the point of discharge;

iii. Sludge at a location meeting the requirements established under the Sludge Quality Assurance Regulations, N.J.A.C. 7:14C. In addition, the provisions for sludge sampling shall meet the following minimum requirements:

(1) Sludge sampling points shall be established at a location which assures homogeneity and best represents the physical and chemical quality of all sludge which is removed from the treatment works for ultimate management;

(2) Sludge sampling points shall provide for sample collection at the frequency required under the Sludge Quality Assurance Regulations; and

(3) Sampling equipment shall be constructed of materials which will not contaminate or react with the sludge (for example, galvanized or zinc coated items may not be used); and

iv. Wastewater quality after every treatment unit.

2. In specific cases, the Department may require the installation of additional sampling points and equipment to assure adequate collection of technical data relevant to protection of the environment or public health.

(d) Monitoring chambers shall meet the following minimum requirements:

1. The monitoring chamber shall be constructed of a permanent and durable material with an opening large enough for access by both sampling personnel and equipment.

i. The sampling chamber shall have a minimum seven foot ceiling clearance;

ii. Electrical outlets shall be provided so that 24 hour sampling equipment can be accommodated; and

iii. The access door or manhole shall have a minimum opening of 24 inches and shall be lockable;

2. An accurate flow measuring device with a totalizer and recording equipment with a documented regular calibration program shall be provided;

3. High water alarms shall be included in all sumps;

4. Pickup probes for all monitoring and sample collection devices shall be provided;

5. All influent streams into the public sewer which are required to be monitored by the applicable permit shall be free of external sources of water (for example, supernatant return, stormwater runoff, unless such runoff is being monitored, tidal water, etc.);

6. A back flow prevention device shall be installed if pumping or flowing to a force main;

7. If the sampling chamber is not in a secured area, it shall be surrounded by a chain link fence;

8. The sampling chamber shall be accessible by motor vehicle; and

9. Adequate lighting and ventilation shall be provided and the area shall be free of any safety hazard.

Notes

N.J. Admin. Code § 7:14A-23.14

Amended by R.1999 d.164, effective 5/17/1999.
See: 31 New Jersey Register 200(a), 31 New Jersey Register 1320(a).
In (c)1iii, changed N.J.A.C. reference.