SECTION 02715
DISINFECTION OF DOMESTIC WATER SYSTEMS
PART 1 GENERAL
1.01
WORK INCLUDED
A.
1.02
Provide personnel, equipment and supplies to disinfect and test all potable water
systems, including water lines, water storage reservoirs, water wells and new
plumbing systems, including flushing at completion of treatment.
RELATED WORK
A.
Section 02713: Water Systems
B.
Section 13411: Welded Steel Storage Reservoir
1.03
REFERENCES
A.
1.04
AWWA Standards.
1.
B300: Standard for Hypochlorites
2.
B301: Standard for Liquid Chlorine
3.
C651-99: Disinfecting Water Mains.
4.
C652-92: Disinfection of Water-Storage Facilities.
QUALITY ASSURANCE
A.
Regulatory Agency Requirements: Comply with applicable state requirements.
B.
The Contractor shall take special care to keep the interior of the pipe clean during
storing, handling, and laying operations in order to reduce the need for flushing to
an absolute minimum. In addition, all open ends shall be tightly covered whenever
unattended to prevent small animals and dirt from entering the pipeline after it is in
place.
1.05
SUBMITTALS
A.
Disinfection Program; submit the following to be used during the program:
1.
Cleaning Equipment.
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2.
3.
4.
B.
1.06
Type and form of disinfectant
Rinsate disposal.
Testing laboratory.
Test Reports; submit two copies as follows:
1.
Disinfection report; include:
a.
Date issued, project name and location.
b.
Treatment Contractor's name, address and phone number.
c.
Type and form of disinfectant used.
d.
Time and date of disinfectant injection start.
e.
Time and date of disinfectant injection completion.
f.
Test locations.
g.
Initial and 24-hour disinfectant residuals in ppm for each outlet
tested.
h.
Time and date of flushing start.
i.
Time and date of flushing completion.
j.
Disinfectant residual after flushing in ppm for each outlet tested.
2.
Bacteriological report; include:
a.
Date issued.
b.
Project name and location.
c.
Laboratory's name, certification number, address and phone
number.
d.
Time and date of water sample collection.
e.
Name of person collection samples.
f.
Test location.
g.
Time and date of laboratory test start.
h.
Coliform bacteria test results for each outlet tested.
i.
Certification that water conforms or fails to conform to bacterial
standards or fails to conform to bacterial standards of the Federal
Safe Drinking Water Act.
j.
Bacteriologist's signature.
PROJECT DELIVERY, STORAGE AND HANDLING
A.
Project against damage and contamination.
B.
Maintain caution labels on hazardous materials.
C.
Maintain storage room dry and with temperatures of uniform as possible between
60 degrees F (15.6 C) and 80 F (26.7 C).
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PART 2 PRODUCTS
2.01
MATERIALS
A.
Disinfectant:
1.
Free chlorine
2.
Liquid, powder or tablet.
B.
Water:
1. Required for filling, flushing and testing the line will be furnished by the Owner
at no cost to the Contractor, within reason, at such points along the pipeline as
water is available from the existing distribution or supply systems.
2. Wasting of water will not be condoned and such actions may require the Owner
to make appropriate charges for such water.
3. The Contractor shall make provisions to provide the water, by tank truck or
other means, to the points necessary to produce specified test pressure.
PART 3 EXECUTION
3.01
INSPECTION
A.
Prior to starting work, verify that domestic water system is completed and
cleaned.
B.
Do not start work until conditions are satisfactory.
C.
Insure existing system isolated from that portion to be disinfected.
3.02
SYSTEM TREATMENT
A.
B.
Water Distribution and Transmission System: Residual Chlorine Concentration in
accordance with Section 4.4 "Methods of Chlorination", AWWA C651-99.
1.
General: Three methods of chlorination tablet, continuous feed and slug.
Tablet method gives an average chlorine dose of approximately 25 mg/L;
the continuous-feed method gives a 24-hr chlorine residual of not less than
10 mg/L; and the slug method gives a 3-hr exposure of not less than 50
mg/L free chlorine. Residual chlorine is not to exceed 250 mg/L. Refer
AWWA C651-99 for further details.
2.
Water Storage Reservoir: Per AWWA C652-92.
C.
Water Wells: Per AWWA C654-87.
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D.
3.03
New Building Plumbing Systems: Per local or State Plumbing Code.
BACTERIOLOGICAL TEST
A.
Take samples where and when required by referenced standards or codes.
B.
Analyze water samples in accordance with "Standard Methods for the
Examination of Water and Wastewater", latest edition, published by American
Water Works Association.
C.
Analyze water samples as otherwise required or allowed by referenced standards
or codes.
END OF SECTION
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