248 CMR 10.13 - Piping and Treatment of Special Wastes
(1)
General.
(a) In no
case shall special wastes discharge into the plumbing system without being
thoroughly neutralized or treated by passing through a properly constructed and
acceptable diluting or neutralizing device.
(b) Only special wastes shall be discharged
into neutralization systems. Exception: Hand washing
sinks and floor drains within a laboratory as designed by a Massachusetts
professional engineer.
(c) The
required neutralizing device shall be automatically provided with sufficient
intake of neutralizing medium to make its contents non-injurious before being
discharged into the drainage system. The neutralizing device shall have an
accessible cover for maintenance.
(d) Special waste piping and treatment
systems shall be designed by a Massachusetts professional engineer with
reference to
314 CMR
12.00: Operation and Maintenance and
Pretreatment Standards for Wastewater Treatment Works and Indirect
Dischargers,
310 CMR
30.00: Hazardous Waste,
314 CMR
7.00: Sewer System Extension and Connection
Permit Program,
257 CMR
2.00: Certification of Operators of Wastewater
Treatment Facilities and
105 CMR
480.00: Minimum Requirements for the
Management of Medical or Biological Waste (State Sanitary Code Chapter
VIII) which contain others requirements applicable to wastewater
discharges. No provision of
248
CMR 10.13 is intended to modify or affect the
regulation of applicable wastes pursuant to the above regulations.
1. Plans stamped by a Massachusetts
professional engineer with a list of special waste material to be discharged
into the system shall be submitted to the local inspector prior to a plumbing
permit being issued.
2. The design
shall include a pH monitoring system with an audio/visual alarm. The
installation, including pipe sizing, dimension, and other aspects shall meet
the requirements for proper functioning, safety, and
248 CMR
10.00. See 10:13: Example
3.
3. Once the
installation is complete but prior to final inspection, the installer must
provide the plumbing inspector with written certification by the designing
Massachusetts professional engineer stating the installation complies with the
stamped drawings and specifications. The Inspector shall not be responsible for
approving or inspecting design specifications, but must ensure the installation
adheres to the provisions of
248 CMR
10.00.
4.
All special waste piping shall be labeled in the following manner:
a. At a minimum of every ten feet;
b. At all changes of direction;
c. On each side of a penetration through a
partition, wall, ceiling, or roof;
d. The labels shall be yellow with black
lettering that:
i. indicate "Special Waste";
and
ii. the letters shall be sized
equal to a minimum, the pipe diameter. However, for piping with a diameter
exceeding two inches, said lettering does not need to be larger than two
inches.
(e) Treatment and/or disposal of special
waste shall be conducted in conformance with
310 CMR
30.00: Hazardous Waste (DEP) or other
authorities if applicable.
(2)
Materials.
(a)
Primary.
Materials used for primary ping systems shall include, but not limited to:
1. High silicon (14.5% cast iron);
2. Polypropylene;
3. Polyethylene;
4. Glass;
5. Chemical stoneware;
6. Stainless Steel Type #316-18-8;
7. Chemical resistant monolith epoxy
resins.
(b)
Secondary Containment. Materials for secondary piping
systems shall include but not be limited to;
1. Poly-Vinyl Chloride (PVC);
2. All materials allowed for primary
piping.
(3)
Design and Installation Special Waste Systems.
(a) Special waste systems shall be designed
to adjust the pH of waste to a level of between six and nine.
(b) Discharge from special waste treatment
systems may connect to either the building sanitary drain or building sanitary
sewer but in no case less than ten feet from the neutralization
system.
(c) Venting systems for
special wastes shall be piped independent of the building sanitary venting
system.
(d) Pumps discharging
special waste shall be designed specifically for a special waste
system.
(e) Fume Hoods and enclosed
equipment shall be individually trapped and vented.
(f)
Battery Waste and Vent
Piping. See 10.13: Example 1
1. The main horizontal branch drain shall be
one pipe size larger than that required by the fixture units connected to it.
Cup sinks shall be figured as one fixture unit.
2. The vent shall be connected to the drain
between the last two fixture traps.
3. A relief vent shall be connected to the
branch upstream of the first fixture on all, but the highest branch connected
to the stack.
4. Additional relief
vents are required on battery systems of waste and vent piping when the total
number of traps served on any one main drain or branch main drain exceeds six,
and each additional relief vent may serve from one to five additional
traps.
5. The minimum size relief
vent shall be two inches.
6. Any
branch from a main battery waste which has a separate trap vent may be
considered a relief vent.
7. Every
branch waste having a developed length exceeding ten feet shall be individually
vented.
8. The vent for a main
battery waste shall be at least ½ the diameter of the horizontal branch
drain.
9. Floor drains may be
connected to the horizontal main battery drain with traps below the floor
provided:
a. the minimum size of the branch
shall be not less than three-inch.
b. a separate trap vent is not required
unless the developed length from the floor drain trap weir to the horizontal
main battery drain exceeds 15 feet.
c. Floor drain traps shall be included in
determining relief vent requirements.
10. Whenever the main horizontal branch of
battery waste piping is below the floor on which the fixtures occur, either a
drum trap or a P trap may be used. A cleanout shall be installed in the
vertical waste above the floor.
(4)
Installation of Point-of-use
Limestone Chip Tanks.
(a)
Product-accepted limestone chip tanks may be used when a full special waste
system is not necessary. These tanks function on a flow-through basis and
generally involve a vertical cylindrical tank filled with calcium carbonate
(more commonly known as limestone). See 10.13: Example
2.
(b) Tank installations
shall comply with
248
CMR 10.13(1)(d)1., 2., and
3.
(c) Point-of-Use tanks with a
capacity of 15 gallons or larger must be chamber vented.
(d) All tank installations shall include a pH
monitoring system with an audio/visual alarm.
(e) A laminated sign shall be stenciled on or
in the immediate area of each chip tank in letters one inch high. This sign
shall state the following:
IMPORTANT
"This tank must be inspected on a regular basis and the neutralizing media replenished when necessary.
Failure to do so may result in serious damage to the building drainage system."
10.13: Example 2 - Chip Tank
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(5)
Industrial
Wastewater. Industrial wastewater treatment systems shall be
designed by a Massachusetts professional engineer and plans and specifications
shall be submitted to the Massachusetts Department of Environmental Protection
(DEP) or other authorities as required.
10.13: Example 3 - Example of pH Neutralization System
Click to view image
Notes
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