Flushing Disinfection Water Distribution Lines 20.01

8/6/2019 Flushing Disinfection Water Distribution Lines 20.01

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Departmentof Public Utilities

Policy and Procedure

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Attachment 1


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City of Chesapeake Department of Public Utilities Utility System Flushing Work Order

Authorization# AC #Requesting Inspector Date of Request I 1Subdivision or Street NameDate of Flushing I IDescription of System to be Flushed:

A B C DSystem Length of Diameter of Duration of Dia. of Flow- DPU UseComponents Pipe Pipe Flushing Thru Device Only1 L.F.2 L.F.3 L.F.4 L.F.5 L.F.

Other Water UsageFeed V alve Size, Turns and Location*

Submitted by InspectorContrac tor Company and Representative

Data Needed for : Filling/Chlonnation - A +BFlushing - B + C + DSampling - C + D + # o f D. . . . . . 3824189 (8.0- orotlficatlonof - 4.00 382-3550(me Da r t e n'Location should be intersection street names or number or nearest hydrant number.Top copy to DPU - Administrative DivisionMiddle Copy to InspectorBottom copy toConbactor CG - 16,139/R96


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Attachment 2


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BACTERIOLOGICAL EXAMMATION OF WATER C i t y o f C h e s a p e a k e , D e p t o f U t i l it i es P.O. Box 15225, Chesapeake, V i r g i n i a 23328 Re tu rn Results: A c c t No. Retu rn Results: Acct. No.

Project Name: Sam ple No. Project Name: Sa mp le No. Collection Pt.: Collection Pt: Date & Ti me Coll.: Cblorin e Ru.mg/L: Collected By: Date & T im e Coll.: Chlor ine R u . mg/L: Col lect ed By:

00 00 FOR LABORATORY USE ONLY: FOR LABORATORY USEONLY: Date & Ti me Analyzed: Analyzed By: Date & Ti m e Analyzed: Analyzed By: DIRECTMEMBRANE FILTRATION METHOD DIRECT MEMBRANE FILTRATION METHOD Volume Fi l tered, m L Collection Site: Volum e Filtered , m L Collection Site: Col i form per Fi l ter Ba throom Coliform p er Filter Ba throom Kitchen Kitchen Colifo rm Colonies/lOOrnl O u b i d e T a p Coliform Colonied100ml O u t t i d e T a p Remarks: Remarks:

Read By: Date & Time: Read By: Dat e & Time:CG-16.0778


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Appendix A


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Existing Pipelineor nipple from valve

CAUTION: Any connection heremust include approveddouble check bockflow

- - preven ter.-- - Pipeline to- - be tested

M.J. Bell L PlugSleeve with

- I - y -etoiner glandM.J. plugProvide temporary

4 - blocking for each endas required.I I

3.5' for 4" t o 8" pipe5.5' for 10"-16" pipeExisting woter main

b dtapping sleeve .valve

4 ' fI : . . . -

Excavotion

cl New MainQ,cl Ir)

Q,3 Appendix A - Figure 1z

CITY OF CHESAPEAKEDEPARTMENT OF PUBLIC UTILITIESCHESAPEAKE. URONlA

Pipe l i ne P repo ra t i onREVISED BY:

P r io r t o Te s t in g & Tie-inREVISED DATE:


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r \\ \end sire (11-1/4* Recommended)NE W MAIN as oppropriote based on site conditions.

NOTE:1. DIRECT DISCHARGE TO MINIMIZE DAMAGEFROM EROSION.2. ELEVATION AT DISCHARGE TO BE HIGH

ENOUGH TO PREVENT WATER FROMRE-ENTE RING THE PIPE.

Appendix A - F igure 2CITY OF CHESAPEAKEDEPARTMENT OF PUBLIC UTILITIES

CHESAPEAKE. HRUHlA

FULL SIZE TEMPORARYREVISED BY: BLOW-OFF REVISED DATE:


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-

Approved 2- DoubleCheck Valve BockflawPreven er

S'uL2" Union- =

2- Valve -7-Distr ibut ion System Supply / 2" l ine Being ChlorinFLOW L Provide Temp. B lockin g

NOTE:1. COPY OF TEST REPORT ON BACKFLOW PREVENTER SHALL BE PROVlDED TO THE INSPECTOR IF REQUESTED.

2. ANY DEVlCE W/SIMILAR CAPABILITIESMA Y BE USED IF APPROVED BY Appendix A - Fig. 3PUBLIC UTILITIESCITY OF CHESAPEAKEDEPARTMENT OF PUBLIC UTILIT

CHESAPEAKE. WRUNlA

MANIFOLD FOR TESTREVlSED BY: 6.W. S. AND CHLORINATIONREVlSfD DATE: 1/98


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.emove cop

Finished Grade

See Standord Drowing W-05bfor Blow-off Details

NOTES:1. ALL PIPE FITTINGS TO BE BRASS OR COPPER.2. UPON COMPLETION OF EACH SAMPLING, THE FLUSHING ASSEMBLY SHALL BE REMO MD. 3. PRIOR TO EACH PLACEMENT, THE ASSEMBLY SHALL BE DISINFECTED. 4. CAP SHALL BE PLACED ON THE BLOW OFF RISER W E N FLUSHING ASSEMBLY NOT INSTALLED. Appendix 'A' - Figure 4

CITY OF CHESAPEAKEDEPARTMENT OF PUBLIC UTILITIESCHESAPEAKE. HRaNlAI Sompling Riser

REWSED BY:REVlSED DATE:

on Stondord 2" Blow-o f f


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Appendix B


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--)

2 - - go* 1 --------c1 1-- Pipe'3-- x J/4" Reducer

r-

3/4' Cote Volve--

3Hose Bibb 3/4' Tee

---

3/4' Pipe(-*:2'

Finished Crode

T hreoded to f i t

u s t o m e r-P l as t i c cop on end or s im i lo rp l u g t o p r e v e n t c o n t o m i n o t i o nto cus tom er ' s l i ne .

NOTE: 1. ANY SIMILAR TYPE OF FLUSH PIPE OF SERWCEBLOW-OFF IS ACCEPTED. Appendix B - Figure 12 . ALL FITTINGS AND P lPE TO BE BRAS S OR COPPER.

CITY OF CHESAPEAKEDEPARTMENT OF PUBLIC UTILITIECHESAPEAKE. HRaMA

I Serv i ce Blow-o f fREVISED BY: ( ~ e t e rRemoved)REVISED DATE:


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BehRqred(go

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Required Contact Time

CI, Concentration (mgll) Prepared 1014199


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Appendix C


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Horizonal Distance in inches for open ended discharge (X)I (v ) I Vertical Drop (in.) (Y) I velocity (fps) 6 12 18 24 30 36 0.5 1.1 1.5 1.8 2.1 2.4 2.61 O 2.1 3.0 3.7 4.2 4.7 5.21.5 3.2 4.5 5.5 6.3 7.1 7.82.0 4.2 6.0 7.3 8.5 9.5 10.4

Notes: 1. It makes no difference ifthe pipe is sloping up (30 degrees or less) or straigthe same dimensions apply to indicate the approximate velocity.2. The diameter of the pipe does not affect the dimensions3. Equation V(2Y/32.2)!5 = X where V = velocity of the water in FPS

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Flushing Disinfection Water Distribution Lines 20.01