N.J. Admin. Code § 7:14A-23.32 - Storage of residuals or septage; and septage handling

(a) All new, upgraded, or expanded domestic treatment works shall be designed to provide adequate residuals storage capacity based on anticipated downtimes (that is weather, maintenance closures, etc.) of the ultimate residual management alternative. This design shall insure the continual, uninterrupted operation of all residual production/processing activities when the ultimate residual management alternative cannot be utilized.

(b) The design of sludge or septage storage facilities shall:

1. Prevent overtopping from normal or abnormal operations, overfilling, wind and wave action, precipitation, run-on and run-off, malfunctions of equipment, and human error;

2. Specify materials that have the appropriate physical and chemical properties, wall thickness, and structural integrity to prevent massive failure due to climatic conditions, pressure gradients, and daily operational stresses;

3. Provide for the periodic removal of stored residuals, cleaning, and inspection;

4. Prevent the migration of residuals to ground water and/or surface waters;

5. Provide for adequate collection and treatment of supernatant or leachates where applicable;

6. Permit residuals sampling and collection pursuant to 7:14A-23.14; and

7. Include overflow prevention devices and/or high level alarms and automatic shut off valves on influent lines.

(c) Slurry tanks shall be designed to provide for mechanical mixing equipment capable of homogenizing stored residuals for removal and sampling.

(d) Surface impoundments shall be designed in accordance with the following conditions:

1. A depth indicator (gauge) which indicates residuals quantities in storage shall be provided.

2. A fence shall be provided around the surface impoundment to prevent unauthorized access or entry.

3. Surface impoundment liners shall conform to the following design requirements:

i. The permeability of the liner materials shall be no greater than 1 x 10[LESS THAN]-7[GREATER THAN] ,, cm/sec for the material being contained. Permeability shall be determined by utilizing the liquid portion of the intended contents to be stored.

ii. The liner shall be adequately supported by a foundation or base so as to resist any pressure gradients that may cause settlement, compression, or uplift.

iii. Liners shall be of materials that are capable of resisting failures caused by: pressure gradients, including static head and hydrogeologic forces, physical contact with the contents, climatic conditions, and stresses associated with installation and daily operations.

4. The design shall provide for a minimum freeboard level of two feet.

5. Mechanical mixing equipment capable of homogenizing stored residuals for removal and sampling shall be provided.

6. When flow is to, from, or between impoundments, all interconnections shall be piped or lined with an impervious material and other appropriate safeguards to prevent both the degradation/erosion of impoundment banks or dikes, and discharges to groundwater.

7. Surface impoundments shall be utilized to store only stabilized residuals that have met the stabilization requirements for pathogen reduction and vector attraction reduction specified in N.J.A.C. 7:14A-20.

8. Surface impoundments require an application be submitted for a NJPDES permit for potential groundwater discharges pursuant to 7:14A-10.7.

(e) Bunker silos, pads, and storage sheds shall be in conformance with the following:

1. The storage surfaces of bunker silos, pads, and storage sheds shall be designed with a minimum slope of two percent to permit the drainage of leachate away from storage piles for collection and treatment.

2. The management and treatment method for the drainage from bunker silos, pads or storage sheds shall be indicated.

3. Storage surfaces shall be constructed of reinforced concrete, asphalt, or other suitable material capable of preventing discharges to groundwater.

(f) Septage handling/receiving facilities shall be designed to provide the following:

1. An unloading ramp for the haul trucks with a hard surface sloped to a drain to facilitate the cleaning of any spillage and washing the haul truck, connector hoses, and fittings. The ramp drainage shall be a tributary to treatment facilities and shall exclude excessive stormwater;

2. A flexible hose fitted with an easy connect coupling to provide a direct connection from the haul truck to the receiving facility;

3. Washdown water with adequate pressure, a hose, and a spray nozzle for cleaning the receiving station and the haul trucks. If a potable water source is utilized, it shall be protected with a suitable backflow prevention device;

4. An adequate off-line septage receiving tank which allows for the collection of representative samples from any truckload of waste accepted for discharge at the wastewater treatment plant. The receiving tank shall be designed to provide complete draining and cleaning by means of a sloped bottom equipped with a drain sump. The design shall also provide for adequate mixing, testing, uniform septage strength, and chemical addition for treatment or odor control purposes;

5. Screening, grit, and grease removal as appropriate to protect downstream treatment units;

6. Valving and piping designed with sufficient operational flexibility so as to control the flow rate and point of discharge of septage to the wastewater treatment plant;

7. Laboratory facilities for determining septage strength and/or toxicity to the wastewater treatment processes; and

8. Any pumps provided for the handling of septage shall be of the non-clogging design and shall be capable of passing three inch diameter solids.

Notes

N.J. Admin. Code § 7:14A-23.32

Amended by R.1997 d.107, effective 5/5/1997.
See: 28 New Jersey Register 380(a), 28 New Jersey Register 2779(a), 28 New Jersey Register 3494(a), 28 New Jersey Register 3858(a), 28 New Jersey Register 4697(a), 28 New Jersey Register 5028(a), 29 New Jersey Register 1704(a).
In (d)7, inserted "reduction" following "vector attraction" and substituted N.J.A.C. reference for CFR, Statewide Sludge Management Plan, and U.S.C.A. references.