Treatment

Question 1

Hypochlorination container greater than 55 gallons have containment?

Answer 1

290.42(f)(1)(E)(ii)(V)

No containment facilities are required for hypochlorite solution containers that have a capacity of 55 gallons or less.

Question 2

All other liquid chemicals have containment?

Answer 2

290.42(f)(1)(E)(ii)(I)

Containment facilities for a single container or for multiple interconnected containers must be large enough to hold the maximum amount of chemical that can be stored with a minimum freeboard of six vertical inches or to hold 110% of the total volume of the container(s), whichever is less.

Question 3

Are facilities provided to determine the amount of disinfectant remaining (e.g. scales or gauges)?

Answer 3

290.42(e)(3)(D)

Facilities shall be provided for determining the amount of disinfectant used daily and the amount of disinfectant remaining for use.

Question 4

If hypochlorination is used, is the container sealed/covered to prevent entrance of contaminants? Is the
container protected from adverse weather conditions?

Answer 4

290.42(e)(5)

Hypochlorination solution containers and pumps must be housed in a secure enclosure to protect them from adverse weather conditions and vandalism. The solution container top must be completely covered to prevent the entrance of dust, insects, and other contaminants.

Question 5

If chlorine gas is used, are an SCBA and an ammonia bottle available outside the chlorine room?

Answer 5

290.42(e)(4)(A)

When chlorine gas is used, a full-face self-contained breathing apparatus or supplied air respirator that meets Occupational Safety and Health Administration (OSHA) standards for construction and operation, and a small bottle of fresh ammonia solution (or approved equal) for testing for chlorine leakage shall be readily accessible outside the chlorinator room and immediately available to the operator in the event of an emergency.

Question 6

If chlorine gas, are cylinders stored separately from equipment?

Answer 6

290.42(e)(4)(B)

Housing for gas chlorination equipment and cylinders of chlorine shall be in separate buildings or separate rooms with impervious walls or partitions separating all mechanical and electrical equipment from the chlorine facilities. Housing shall be located above ground level as a measure of safety. Equipment and cylinders may be installed on the outside of the buildings when protected from adverse weather conditions and vandalism.

Question 7

If chlorine gas, is the building ventilated with high- and floor-level vents which are screened? If > one cylinder at
a time is used, is forced air ventilation provided (where air is drawn in from the top)?

Answer 7

290.42(e)(4)(C)

Adequate ventilation, which includes both high level and floor level screened vents, shall be provided for all enclosures in which gas chlorine is being stored or fed. Enclosures containing more than one operating 150-pound cylinder of chlorine shall also provide forced air ventilation which includes: screened and louvered floor level and high level vents; a fan which is located at and draws air in through the top vent and discharges to the outside atmosphere through the floor level vent; and a fan switch located outside the enclosure. Alternately, systems may install negative pressure ventilation as long as the facilities also have gas containment and treatment as prescribed by the current International Fire Code (IFC).

Question 8

Is liquid ammonia sulfate used?

Answer 8

290.42(f)(2)(H)

Chlorine feed units, ammonia feed units, and storage facilities shall be separated by solid, sealed walls.

Question 9

If using chloramines, chlorine and ammonia injected in the correct order?

Answer 9

290.42(e)(7)(A)

The order of chlorine and ammonia injection must be accomplished in a manner which allows inactivation of viruses and oxidation of cyanide.

Question 10

No prior treatment: chlorine injected ahead of ammonia?

Answer 10

290.42(e)(7)(A)(i)

When chlorine is injected upstream of any other disinfectant, the ammonia injection point must be downstream of the chlorine injection point.

Question 11

Adding to chlorinated water: is chlorine injected ahead of ammonia?Should but not shall

Answer 11

290.42(e)(7)(A)(iii)

When chlorine and ammonia are added to distribution water that has a free chlorine residual, chlorine should be added first.

Question 12

Adding to chloraminated water: Is ammonia injected ahead of chlorine?Should but not shall

Answer 12

290.42(e)(7)(A)(ii)

When chlorine and ammonia are added to distribution water that has a chloramine residual, ammonia should be added first.

Question 13

If using chloramines, mixing provided to disperse chemicals?

Answer 13

290.42(e)(7)(B)

Mixing shall be provided to disperse chemicals.

Question 14

If using chloramines, sample tap provided upstream of any chemical injection point?

Answer 14

290.42(e)(7)(C)(i)

Sample taps must be provided as follows:
(i) upstream of the chlorine or ammonia chemical injection point, whichever is furthest upstream

Question 15

If using chloramines, sample tap between chemical injection points (if submitted for review after 12/31/15)

Answer 15

Sample taps must be provided as follows:
(ii) between the addition of the chloramine chemicals at chloramination facilities submitted for plan review after December 31, 2015. For these facilities, an installation without this sample tap may be approved if an acceptable technical reason is described in the plan review documents. Technical reasons, such as disinfection byproduct control, must be supported by bench scale sampling results. Other technical reasons, such as membrane integrity, must be supported by documentation

Question 16

If using chloramines, sample tap provided downstream of both chlorine and ammonia injection points?

Answer 16

Sample taps must be provided as follows:
(iii) at a point after mixing to be able to measure fully-formed monochloramine levels.