HomeMy WebLinkAboutCLOGIA LT 13¢logia
Lot I
#014-091-30
Municipality of Anchorage
P.O, Box 196650 · 4700 Elmore Road
Anchoraqe, A aska 99519-6650 · (907) 343-7904 · Fax (907) 343-7997
http:llwww.muni.or,qlOnsite
Development Services Division
On-Site Water and Wastewater ProRram
**** VARIANCE/WAIVER REVIEW ****
Waived4: OSP121128. COSA#:__
PID#: 014-091-30
Legal Description: CIo.qia, Lot t3
Engineer: Anderson En.qineerin.q
Permit#:
Appricant: Anderson Enqineerinq
Your request for a waiver of the required 100 feet horizontal separation from the
public sewer manhole to the private well has been approved. The approved separation distance
is 42 feet. Your request for a waiver of the required 75 feet horizontal separation from the
public sewer trunk to the private well has been approved. The approved separation distance is 38
feet.
This waiver approval applies to the proposed public sewer manholes and tnmk line only.
[] The affected adjacent property owner(s) have been given a 7 day notice regarding this
waiver.
[] Notarized letter(s) of nonobjection have been received from the owner(s) of the'affected
adjacent property.
[] Adjacent properties are not affected by this waiver.
Waiver is Granted: X Waiver is not Granted:
Date: ~,~ 0//~l Approved by: ,~.(~¢¢'
., ............... ,,, ............. ,,,, ....... ~...%m.~.~,~...~-~,..::v::~:.. .... , ......... ,,,
Rec~: 05"~t'~' ¢x Amount?/~'~ ~' Date Paid:~; "
**** VARIANCE/WAIVER REVIEW ****
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766 (FAX)
June 11,2012
Municipality of Anchorage
Development Services Department
On-Site Water and Wastewater Program
4700 Elmore Road
Anchorage, AK 99519-6650
Attention:
On Site Services Engineer
Subject:
Lot 13, Clogia Subdivision
Separation Distance Waiver Well to Sewer Main/Manhole
Dear On Site Services Engineer:
A new 8" sewer main is currently being placed along Kovey Street off of East 72nd Avenue. The
main is composed of C900 DR18 PVC material. This sewer main will be placed 39' from the
well on Lot 13, Clogia Subdivision. A waiver is required to allow placement of the main less
than 75' from the well. In addition, a manhole to the southwest of the well is 43' away and a
manhole to the southeast is 99' away. Waivers are also required to these manholes as they are
less than 100' from the well.
The well on Lot 13 is 96' deep with casing the entire depth. The well is drilled through what
appears to be silty sand material with silt lenses at depth. The aquifer level is not encountered
until 90' below the ground level where the pump is placed. The static water level was found at
41' below the surface and more than 33' below the bottom elevation of the sewer main.
The material utilized in the construction of the water main has a minimum wall thickness of .503
inches and a minimum bell thickness of .562 inches. The connection between joints includes a
rubber gasket and when properly installed create a watertight joint. The sewer main will be
pressure tested to verify no leaking can occur. In addition to the gasket seal all joints within 75'
of the well will be totally encased in concrete to insure no leakage of effluent can occur. The
sewer main will operate at atmospheric pressure so leaking is virtually impossible without a
cataclysmic event.
The ground surface from the well flows away at an approximate 10% grade toward Kovey Street
and the sewer main. Any overflow of the sewer system that could occur would be contained in
the ditch to be constructed along Kovey Street or the storm drain also to be constructed. Kovey
Street will be constructed to half street standards with a ditch along the north side and curb and
gutter on the south. A storm drain will be constructed full length of the street.
The manholes along the sewer main will be coated with waterproof bituminous coating before
final assembly. Joints in the manhole will be sealed with Mac Wrap exterior pipe joint sealer
Lot 13, Clogia Subdivision
June 11; 2012
P~ge 2 of 2
after the manhole has been waterproofed. Infi-shield external uni-band seal will be placed over
the frame, grade rings and the top of the cone. The manholes will then be wrapped with three
tayers of 8-mil thick polyethylene encasement material after the mac wrap and infi-shield have
been installed.
The owner of the well on Lot 13 does not wish to connect to the AWWU water system. It would
appear based on materials used for the new sewer system that any contamination threat to the
well is very remote. We therefore request the waivers be issued allowing the new sewer main
and manholes to be constructed as stated above.
Attached are drawings showing the proximity of the existing well to the new sewer main. Also
included are the specifications for the C900 SD18 PVC pipe and the manholes slated for use.
A waiver issued by ADEC for Lot 2, Clogia for a similar circumstance is provided for your review.
Sincerely,
Michael E. Anderson, P.E.
Attachments
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766 (FAX)
June 20,2012
Municipality of Anchorage
Development Services Department
On-Site Water and Wastewater Program
4700 Elmore Road
Anchorage, AK 99519-6650
Attention:
On Site Services Engineer
Subject:
Lots 13 and 16, Clogia Subdivision
Separation Distance Waiver Well to Sewer Main/Manhole
Sewer Main Joint Encasement Sepcifications
Dear On Site Services Engineer:
All sewer main joints within 75' of the private well must be encased in concrete. The
encasement must be a minimum of 6" thick around the entire outer circumference of the pipe.
Concrete must be placed monolithically and extend a minimum of 3' in each direction of the joint
for a total length of 6'. Concrete shall have a minimum compressive strength of 3,000 PSI.
Sincerely,
Michael E. Anderson, P.E.
Attachments
Privote Well
4J' .39' %99'
C900 DR-18 PVC
SD NO'20'57"W
v w
~% MICHAEL E. ANDERSON
SCALE 1"=30' ~¢.
PROFILE AS-BUILT
SCALE 1" = 20'
43'
Stetlc Woter Level 41'
PROFILE AS-BUILT
SCALE 1" = 20'
Aarow Pump & Well Service, LLC
P.O, Box 110496
Anchorage, AK 99511
Office: (907) 346-9355 · Fax (907) 333-8976
Eagle River: (907) 622-9335
No. 941
CUSTOMER
i- ~._/ .~., . -I
Q'UAN~ITY DESCRIPTION/ PRICE AMOUN'I
LABOR HOURS RATE AMOUNT TOTAL MATERIAL ~/~,
TOTAL LABOR
RK ORDERED BYI DATE COMP' TOTAL LABOR
PAY THIS A~OUNT d~/~'
ankYou
SIGNATURE
{ereby Acknowledge the Satisfactory Completion of the Above Described Work and agree that if above work is not paid for in 90 days I agree to allow Aa
Rump & Well Servme. LLC, the right to remove unpaid for equipment and charge for labor already pedormed & labor to remove unpaid for equipment.)
TERMS: ACCOUNTS PAYABLE AT 10TH OF MONTH FOLLOWING PURCHASE.
SERVICE CHARGE AT RATE OF 1,5% PER MONTH WILL BE CHARGED ON OVERDUE ACCOUNTS,
l/
x
COVER I.A.W. STANDARD
DETAILS 50-8. 50-9, &~ 50-10
AS APPROVED BY THE ENBINEER
NOTES:
1. STEEL RE0'B FOR BARREL SHALL CONFORM TO ASTM C-47B. IMBED
STEEL IN BASE SO THAT FIRST BARREL SECTION IS CONNECTED WITH
BASE,
2. ALL MANHOLE SECTIONS SHALL CONFORM TO ASTM B-47B.
PROVIDE Z-LOK BOOTS FOR B" TO lB" PIPE PENETRATIONS. PROV]DE
A-LOK BOOTS FOR 20" THROUGH 24" PIPE PEN[TRATIONS. GROUT PER
MANUFACTURER'S RECOMMENDATIONS.
4, COAT ALL EXTERNAL CONCRETE SURFACES OF MANHOLE WITH
WATERPROOF BITUMINOUS COATING,
B, "RAM-NEK" OR EQUAL AND PRIME BARREL JOINTS, HEAT "RAM-NEK~
AND SEAL SURFACES BEFORE FINAL ASSEMBLY.
S. SEAL MANHOLE JOINTS WITH "MAC WRAP" EXTERIOR PIPE JOINT
SEALER OR APRROV[D EQUAL. AFTER MANHOLE HAS BEEN
WATERPROOFED (TYP ALL),
7. INSTALL [NFl-SHIELD EXTERNAL UNI-BAND SEAL OVER FRAME. GRACE
RINDS. AND TOP OF CONE.
8. WRAP EXTERIOR OF MANHOLE W/THREE LAYERS OF B--MIL THICK
POLYETHYLEN[ ENCASEMENT MATERIAL AFTER INSTALLING "MAC WRAP"
AND INFI-SH[ELD,
9. MANHOLE SHALL HAVE MINIMUM OF ONE (1) SIX-INCH (6") GRADE
RING.
10. BACKFILL AROUND MANHOLE W1TH NFS MATERIAL (3-FEET MINIMUM).
BACKFILL SHALL BE INCIDENTAL TO COST OF MANHOLE INSTALLATION,
11. FOUNDATION MATERIAL AS DIRECTED BY ENGINEER
MANHOLE DETAIL
NO SCALE
Physical Requirements for
AWWA C900 Pipe
Material: Pipe compound shall meet
cell class 12454 per ASTM D1784
"Standard Specification for Polwinyl
Chloride (PVC) Compounds and
Chlorinated Polyvinyl Chlodde (CPVC)
Compounds."
Standard Laying Lengths: Standard
laying lengths shall be 20 ft. (±1 ") for
all sizes.
Hydrostatic Test: Each length of
pipe, including the joint, shall be
tested to four times the pressure
class of the pipe for a minimum of 5
seconds at the pressure listed in the
table below.
PC 10O DR2S 40~ psi
PC 150 DRlS 600 psi
PC 2~ DR14 800 psi
Quick Burst Test: Randomly
selected samples tested in
accordance with ASTM D1599 shall
withstand the pressures listed below
when applied in 60 to 70 seconds.
PC 1~0 DR2.5 535 psi
PC 150 DR18 755 psi
PC 2~0 DR14 98~ psi
Pipe Stiffness (F/&y): The pipe
stiffness for PVC Municipal Water
Pipe is listed in the table below,
DR25 129 psi
DRI 8 364 psi
DR14 815 psi
Agency Listings:
Underwriter's Laboratory (UL)
Factory Mutual (FM)
ANSI/NSF 61
Short Form Specification
for AW~VA C900
Scope: '[his specification designates
general requirements for Polyvinyl
Chlodde (PVC) water distribution pipe
in sizes 4-inch through 12-inch, with
integral bell and spigot joints for the
conveyance of water and other liquids.
Pipe: Pipe shall meet the require-
ments of AVWVA C900 "Polyvinyi
Chloride (PVC) Pressure Pipe and
Fabricated Fittings, 4-Inch through
12-Inch, for Water Distribution."
Other Requirements:
· Provisions must be made for ex-
pansion and contraction at each joint
with an elastomeric seal.
· The bell shall consist of an integral
thickened wall section with an elas-
tomedo seal. The wall thickness in
the bell section shall conform to the
requirements of Section 6,2 of ASTM
D3139, "Standard Specification for
Joint for Plastic Pressure Pipes Using
Rexible Elastomedc Seals."
· When used for potable water
systems, pipe shall meet the re-
quirements of ANSVNSF 61 "Drink-
ing Water System Components
-- Health Effects,"
· The pipe shall be manufactured to
cast iron outside diameters (CLOD) in
accordance with AWVVA C900.
· The seal shall meet the requirement
of ASTM F477 "Standard for Elas-
tomedc Seals (Gaskets) for Joining
Plastic Pipe."
Physical Requirements for
AWWA C905
Material: Pipe compound shall meet
cell class 12454 per ASTM D1784
"Standard Specification for Polwinyl
Chloride (PVC) Compounds and
Chlorinated Polyvinyl Chloride (CPVC)
Compounds."
Standard Laying Lengths: Standard
laying lengths shall be 20 ft. (±1 ") for
all sizes.
Hydrcstatic Test: Each length of
pipe, including the joint, shall be
tested to two times the pressure
rating of the pipe for a minimum of 5
seconds at the pressure listed in the
table below.
Agency Listing:
ANSI/NSF 61
Short Form Specification
for AWWA C905 Pipe
Scope: This specification designates
general requirements for PoIwinyl
Chloride (PVC) water transmission
and distribution pipe in sizes 14-inch
through 24-inch, with integral bell
and spigot joints for the conveyance
of water and other liquids.
Pipe: Pipe shall meet the require-
ments of AW~VA C905 "Polwinyl
Chloride (PVC) Pressure Pipe and
Fabricated Fittings, 14-inch through
48-inch, for Water Transmission and
Distribution".
Other Requirements:
· Provisions must be made for ex-
pansion and contraction at each joint
with an elaetomeric seal.
· The bell shall consist of an integral
thickened wall section with an alas-
tomeric seal. The wall thickness in
the bell section shall conform to the
requirements of Section 6.2 of ASTM
D3139, "Standard Specification for
Joint for Plastic Pressure Pipes Using
Flexible Elastomeric Seals."
· When used for potable water
systems, pipe shall meet the re-
quirements of ANSI/NSF 61 "Drink-
ing Water System Components
-- Health Effects.~
· The pipe shall be manufactured to
cast iron outside diameters (CLOD) in
accordance with AWWA C905.
· The seal shall meet the require-
ments of ASTM F477 "Standard for
Elastomeric Seals (Gaskets) for Join-
ing Plastic Pipe."
The Sealing System
PW Eagle's ioints employ gasket
systems that have excellent track
records in the field. The joining
systems are factory-made with
rubber gaskets installed in the ring
groove at the time of manufacture.
The gaskets are designed to retain
in the dng groove. When assembly
technique is consistent with PW
Eagle instructions, the secured
gasket systems will not displace.
The gaskets are classified to ANSi/
NSF Standard 61.
Cross-Sectional Views
The following drawings show the
cross-sectional views of the pipe
before and after assembly. When
the pipes are pushed together the
rubber in the seal is compressed.
Compression gives rise to a sealing
pressure that acts on the socket and
spigot as shown in the illustration
below.
Gasket in place.
Gasket after pipe joining.
' Sealing
NOTE: Gasket drawings are
representations. Actual gaskets may
vary from drawings
Installation Advantages of
the PW Eagle Joint
The gasket is factory installed, so
there are no gaskets to install on the
job site. This avoids the possibility
of installing the wrong gasket or
improperly installing the correct
gasket. The installer should leave
the factory-installed gasket in place
and simply follow PW Eagle Joint
Assembly instructions for problem-
free joint performance.
Installation Standard
AWWA C900 and C905 pipe
should be installed in accordance
with AVWVA C605 "Underground
Installation of Polyvinyl Chloride (PVC)
Pressure Pipe and Fittings for Water."
Joint Assembly
PW Eagle's C900 and C905 pipe will
arrive on the job site with the gasket
installed at the factory, ready for
assembly.
Assemble as follows:
1. Inspect the bell and remove any
foreign matter such as mud, sand or
ice. DO NOT REMOVE THE GASKET
FROM THE PIPE.
2. Clean off the spigot end of the pipe
and apply lubricant evenly, covering
the beveled nose and sealing surface
up to the stop mark. NOTE; Use only
lubricant supplied by PW Eagle - the
use of other lubricants may cause
deterioration of pipe or gasket,
3. Place the beveled end in the
companion bell and provide straight
alignment.
4. Push the pipe straight into the bell
with a block and bar until the stop
mark on the spigot is even with the
end of the bell.
5. NOTE: DO NOT ASSEMBLE
THE JOINT BY SWINGING OR
STABBING.
6. NOTE: For larger sizes of pipe,
additional mechanical assistance
(such as a come-along or hydraulic
jack). DO NOT ASSEMBLE THE
JOINT USING A BACKHOE BUCKET.
7. Allowable axial deflection at the
joint varies with each manufacturer's
design. For PW Eagle products,
allowable deflection is two degrees.
For more information, see PC/Eagle's
technical bulletin "Gasketed Pipe
Assembly."
Gasketed AHNVA C900
& C905 Transmission
& Distribution pipe is
the clear choice for
municipal applications.
Tapping PVC - C900
PW Eagle's C900 and C905 pipe
may be tapped either dr,/or under
pressure. There are three types of
tapping equipment and methods.
1. Direct Tapping
The only pipes that may be direct-
tapped are C900 DR14 and DR18 in
sizes 6-inch through 12-inch. When
direct tapping, follow the procedures
in Uni-Bell's Uni-B-8 "Recommended
Practice for the Direct Tapping of
Polyvinyl Chloride (PVC) Pressure
Water Pipe."
2. Saddle Tapping
All sizes and DRs of C900 and C905
may be saddle-tapped, Maximum
tap size is 2 inches for saddles.
Service clamps or saddles used with
PVC pipe must:
a. be designed for use with ClOD
PVC pipe
b. provide full support around the
circumference of the pipe
c. provide bearing area of sufficient
width along the axis of the pipe
(minimum 2-inch width for taps up
to 1 inch diameter; minimum 3-inch
width for taps 1 ~/4 to 2 inch diameter)
3. Tapping Sleeve or Valve
All sizes and DRS of C900 and C905
may be tapped using a tapping
sleeve or valve. For connections
greater than 2 inohes in diameter,
this method is required. Maximum
connection is size-on-size.
V - For field outs, draw a stop mark (line "V") by subtracting 5/8" from Dell length "C".
WARNING:
Do not use PVC pipe to con-
vey air or other gases under
pressure. If failure should
occur, the result would be
catastrophic. Rapid expansion
of the compressed gas would
send shards of plastic over a
wide area and could result in
serious injuw or death.
Nominal Average Apl~'~x MIn Wall Min Bell Approx Appmx Approx
Pipe Size DR Pipe OD Pipe ID 11fickness {t) Thickness {tl) Sell OD Weight Weight
(inches) (inches) (inches} (inches) (inches) (inches) (ibs/10Oft) (ibs/pe)
8 25 9.05 8.3~ .362 ~ 12~A 870 ~34
8 18 g-05 8.~4 .503 .552 12¥~ 910 182
8 14 $.05 7~76 ~646 .74~ T2Vs 1150 ~
10 25 11.10 10.21 .444 .483 147~ 1010 202
10 18 11.10 9.87 ,617 ~sgo 147/~ 1370 27~
~4 18 15.30 13;60 ?50 ,960 19~,~ ~80 516
16 18 17A0 15.47 .967 1.095 2~,~ ~880 676
18 18 19,50 17.18 1~083 1:225 24% 4250
Customer Service Centers
Oregon $00-~7-0200 MissouH $00-341-0053
Fax 541-686-9257 Fax 573-474-1760
West Virginia 800-624-3111
Fax 304-472-0742
PWEagle RO. BOX 10049, Eugene, OR 974~0. (800)347-0200. (54~) 343-0200 · FAX(541) 686-9257- www.pwea§leino.oOffl
DEPT. OF ENVIRONMENTAL CONSERVATION
DIVISION OF ENVIRONMENTAL HEALTH
DRINKING WATER PROGRAM
555 CORDOVA STREET
ANCHORAGE, AK 99501
http://www.state.ak.us/dec/home/htm
/TONY KNOWLES, GOVERNOR
Telephone: (907)269-7696
Fax: (907) 2694655
October 3 t, 1997
RECEIVED
Mr. Kenneth G. Lang, R.L.S,
1731 George Bell Circle
Anchorage, Alaska 99515-3957
NOV 10 t997
~4ummpali~y of Anchorage
Dept. Health & Human Serv/cea
Subject:
Clairmont Subdivision: Separation Distance Waiver between Private Well on Lot
2, Clogia SuMivision and Sewer Collection Line fur Clairmont Subdivision;
ADEC Plan Review Number: 982 I-WV-212-010; Review
Dear Mr. Lang:
I have reviewed information provided by Anchorage Water & Wastewater Utility (AWWU),
Engineering Division which was submitted in response to items found in my September 24.
1997 letter_ Based on this review and have found that the submitted waiver request justifiable.
Therefore, in accordance with the provisions of State Drinking Water and Wastewater
Regulations (I8 AAC 80.030 and t8 AAC 72,015), the following separation distances are
granted:
Between the existing private source well located on Lot 2, Clogia Subdivision and
the sewer line from 100 feet to 55 feet at the closest point.
Between the existing private source well located on Lot 2, Clogia Subdivision and
the manhole (C-7 on the submitted plans) from 100 feet to 55 feet.
These waivers are valid if the following requirements are met before AWWU accepts the sewer
line for service:
The existing manhole C-7 be modified as shown on plans submitted to this office
with your July 31. 1997 submittal.
The existing sewer line within the protect/ye radius will be exposed and any joints
be secured with field lock fittings, as also shown on plans submitted to this office
with your July 31, 1997 submittal.
Mr. Kenneth G. Long, R.LS. 2 October 3t, 1997
Th/s approval does not imply the granting of additional authorizations, nor obligate any federal,
state, or local regulatory body to grant required authorizations.
Thank your for your cooperation with this Department. If you have any questions, please contact
me,
Keven K Kleweno, P.E.
Environmental Engineer
KKK/cf
cc: Wayne Bennett, AWWU
Jim Cross, P.E.; DHHS
7. Check all around pipe for rolled or "fishmouthed" gaskets after
coupling.
8. Do not pick up and drop coupled pipe to adjust grade.
9. Ensure that the pipe is not supported only at the bell nor is the pipe
barrel resting on a high spot. The bottom quarter of the pipe shall be
uniformly supported through its length in order for the pipe to resist
the design loads.
F. Laying Instructions for Other Pipe
All other pipe shall be laid in accordance with the manufacturer's published
The Contractor shall clean and flush all sanitary sewer pipe installed prior to testing
and substantial completion inspection. Sewer main and service trenches shall be
substantially backfilled and compacted.
All sanitary sewer pipe installed shall be subject to either an infiltration test or an
exfiltration test. In those areas where, in the opinion of the Engineer, the water
table is high enough to subject the pipe to a satisfactory infiltration test, it is not
anticipated that an exfiltration test shall be required. In checking leakage, there will
be no allowance made for external hydrostatic head.
Where in the opinion of the Engineer, the water table is not high enough to provide
a satisfactory infiltration test, an exfiltration test shall be required.
The type of test (either infiltration or ex'filtration) shall be determined by the
Engineer. The Contractor shall have the option of choosing only one method (air or
water) of testing for each section tested.
All wyes, tees, or ends of side sanitary sewer stubs and service connections shall
be plugged or capped and the plug or cap shall be securely fastened to withstand
the internal test pressures. Such plugs or caps shall be readily removable and their
removal shall provide a socket suitable for extending the lateral connection.
All testing shall be considered a subsidiary obligation under Furnish and Install Pipe
and is considered incidental to the Contract.
The Contractor shall take precaution to prevent sewage from entering the new
sanitary sewer pipeline until it has been inspected, tested and accepted for
operation by the Engineer. The Contractor may request inspection, testing and
acceptance of incremental segments of the Work. An incremental segment shall
be considered a mainline sanitary sewer with a completed manhole or cleanout at
each end.
B. Ex'filtration Test (Using Water)
On completion of a section of sanitary sewer between manholes or otherwise, the
Engineer shall require that the ends of all pipe be plugged, including service
Page 9 R2
Standard Construction Specifications Rev 2
2009 MASS Division 50 - Sanitary Sewers 3/12
connections, and the pipe subjected to a hydrostatic pressure. Generally all testing
is to be conducted after backfilling, prior to resurfacing and after service
connections are made.
A minimum head of six feet (6') of water above the crown at the upper end of the
test section shall be maintained for a period of four (4) hours dudng which time it
will be presumed that full absorption of the pipe body has taken place and
thereafter for a further period of one (1) hour for the actual test of leakage. During
this one-hour pedod, the measured loss shall not exceed the rate of fifty (50)
gallons per inch diameter per mile per twenty-four (24) hours.
The above listed leakage rate shall also be applied to infiltration from ground water
and infiltration or exfiltration in greater amounts will be cause for rejection of the
sanitary sewer and all repairs necessary to meet these requirements and retesting
shall be at the expense of the Contractor.
The maximum length of sanitary sewer for the above allowable leakage test shall
be one thousand feet (1,000'). If it is not apparent that leakage test results between
any two (2) manholes is satisfactory, then the Engineer may require subsequent
tests to establish the more exact location of the leakage areas. Any section of
sanitary sewer between any two (2) manholes that does not meet the above
requirements shall be rejected and the Contractor, at his expense, shall make the
necessary repairs to the sanitary sewer to meet the requirements, and shall make
subsequent tests after repairs to assure compliance with the Specifications.
Ex'filtration Test (Using Air)
The Contractor shall furnish all facilities and personnel for conducting the test under
the observation of the Engineer. The equipment and personnel shall be subject to
the approval of the Engineer. Joints only may be tested in pipe thirty-six inches
(36") in diameter, or larger at the option of the Contractor.
The Contractor may desire to make an air test prior to backfilling for his own
purpose. However, the acceptance air test shall be made after backfilling has been
completed, and compacted.
Immediately following the pipe cleaning, the pipe installation shall be tested with
Iow-pressure air. Air shall be slowly supplied to the plugged pipe installation until
the internal air pressure reaches four (4.0) pounds per square inch greater than the
greatest back pressure of any ground water in contact with the pipe. At least two
(2) minutes shall be allowed for temperature stabilization before precaeding further.
The pipeline shall be considered acceptable when tested at an average pressure of
four (4.0) pounds per square inch greater than the greatest back pressure of any
ground water in contact with the pipe, if:
The total rate of air loss from any section tested in its entirety between
manholes or between manholes and cleanout structures does not exceed
two (2.0) cubic feet per minute, or the following table may be utilized as a
guideline for a satisfactory test by air for pipe sizes shown:
Page 10 R2
Standard Construction Specifications
Division 50 - Sanitary Sewers
Rev 2
2009 MASS 3/12
Allowable Pressure
Pipe Diameter Drop in 10 Minutes
8" 2.7 PSI
10" 2.1 PSI
12" 1.8 PSI
15" 1.4 PSI
18" 1.2 PSI
24" 0.9 PSI
Pressure gauges shall be incremented in not more than 1/2 pound increments for
accurate tests,
If the pipe installation fails to meet test requirements, the Contractor shall determine
at his own expense the soume or soumes of leakage, and he shall repair (if the
extent and type of repairs proposed by the Contractor are acceptable to the
Engineer), or replace all defective materials or Workmanship. The completed pipe
installation shall meet the requirements of this test or the alternative water
exfiltration test before being considered acceptable.
Safety braces shall be required to hold plugs in place and to prevent the sudden
release of the compressed air. Due to the large fomes that could be exerted by an
escaping plug dudng the testing of the pipe, workmen shall not be allowed in the
manholes in which plugs have been placed while tests are being conducted. The
Contractor's testing equipment shall be arranged in such a manner that a pressure
relief device will prohibit the pressure in the pipeline from exceeding 10 PSI.
Infiltration Test
Infiltration testing may be allowed at the Engineer's option when the natural ground
water table is six feet (6') above the crown of the higher end of the test section.
The maximum allowable limit for infiltration shall not exceed the rate of fifty (50)
gallon per inch diameter per mile per twenty-four (24) hours.
The Contractor shall fumish all tools, equipment, and labor necessary to complete
the tests and shall verify from his own observations, or preliminary tests, that each
line conforms with this Specification before requesting the Engineer to observe and
record the actual leakage.
The Engineer may require the Contractor to repair obvious leaks even though the
total length of the test section falls within the maximum allowable leakage for the
test used.
Page 11
Standard Construction Specifications
Division 50 - Sanitary Sewers
Revised 11/08