Triton Lining Systems LLC.

The City of Sac City, Sac City Iowa, Water Distribution Pipe In-Situ

RehabilitationJuly 2012

Project Details

1,129’ x 6” cast iron water main

1,563’ x 4” cast iron water main

Installed – 1940’s, 1970’s, 1990’s

Properties affected – 41 homes, 105 residents

Subdivision - Oak Hill Drive

Problem – Severe discolored water complaints

The Problem / Cause

The conveyed water interacted with the cast iron, causing severe tuberculation build up, internal corrosion, loss of hydraulic efficiency, loss of carrying capacity, degradation of water quality & pipe integrity

Attempted Remedies

The system was ‘looped’ – the problem got worse

Super chlorination of the entire water system (break

point chlorination) for 30 days - helped short term but the problem returned

Hydrant flushing increased – occasionally made the

problem worse

Direction of water flow changed – no effect

Supplied customers in the effected area with water filters

- helped but didn’t fix the problem

The Search for a Solution

Contacted Iowa Rural Water Association Contacted American Water Works Association

Talked with vendors

All resources had no new ideas other than replacing the

mains

Started searching the internet for ideas

Potential Solutions

1. Temporary fix: Furnish the homes with a high end filtration system - Cost approx. $1,000.00/home ($41,000 total). Filters will last 10-15 years with cleaning annually but does not fix the problem

2. Semi-permanent: Pig or swab the lines - this would not fix the problem just delay it’s return. Associated issues - plugged service lines, plugged water heaters, residue in the pipes. Cost - $12,925.00

3. Long term/semi-permanent fix: Rehabilitate the pipe in place - a longer lasting solution (50 year design life), medium cost but permanent elimination of problem

4. Permanent Solution: Replace the main – high cost

Narrowing the Options

Main Replacement

Pro’s- Permanent Fix- City Crews familiar

with process

Con’s- 2 year duration- Cost- Cost- Cost

Main Rehabilitation

Pro’s- Less Cost- Speed of installation- No Engineering fees- Less social disruption

Con’s- Unfamiliar to City crews- 1st in the State of Iowa to

use this technology

The Chosen Solution

City personnel searched for an appropriate technology that would deal with the problems, while offering a long term, cost effective solution

They found and employed Triton Lining Systems

to rehabilitate the piping system and eliminate all the problems associated with it

Planning

The City & Triton met to discuss the project

The project area was walked, all excavation locationsidentified & marked, temporary water system

mapped out, proposed working sequence planned,

responsibilitiesdetermined & the final price agreed

Working Partners a Novel Approach

The City & Triton formed an excellent working relationship where City personnel were utilized to undertake the functions of the project they were equipped for and accustomed to doing, while Triton performed the actual cleaning & lining of the pipes

This scenario enabled the project to be complete

in approx. 16 weeks with minimal social disruption and at a saving of over $1,575,000 compared to traditional remove and replace

Work Area & Bypass Plan

The Rehabilitation 9 Step Process

1. Pipe Location / Access – City Personnel2. Bypass – City Personnel3. Excavation – City Personnel4. Isolation – City Personnel5. Cleaning – Triton6. Inspection (Pre lining) – Triton7. Lining – Triton8. Inspection (Post lining) – Triton9. Re Connection / Disinfection – City Personnel

Pipe Location / Access

Excavation locations were pre determined by Triton, utility locates were organized and performed by the City

Road cut permits were obtained prior to construction

Bypass

An above ground bypass system was installed to feed water to all properties affected by the construction

This meant customers were only affected for a very short time during the set up and removal of the bypass system

Excavation

Wherever possible, excavations / access openings were made at existing fittings (valves, tees, fire hydrants, bends etc.)

This enabled the opportunity to upgrade the entire system

Isolation

Isolation valves that only affected the pipes within the project area were identified

Valves were checked for operation and complete shut down prior to construction

The Pipe Prior to Cleaning

Pipe Cleaning

Pipe scrapers were pulled through the line several times to loosen any tuberculation and buildup, this was done with the additional use of water

Plunging / Swabbing

After scraping, plungers were pulled through the line several times to remove the loose debris and any remaining liquids

Foam swabs were then washed through with water

to remove any remaining debris

Finally, foam swabs were blown through the pipe with compressed air to remove fine particles and dry the pipe

Swabbing

The Pipe After Cleaning & Drying

CCTV Inspection

The cleaned pipe was then cctv inspected for verification and effectiveness of the cleaning

Inspection (Pre Lining)

The purpose of the pre lining inspection is verify the effectiveness of the cleaning and identify any potential problems such as:

Un clean pipe Un known valves Bends Standing or running water (leaking services) Over poured lead joints (lead fish) Repair sections / open joints / clamps Low service connections Obstructions

The Lining Process

Control Systems

Computerized metering and monitoring ensure quality and repeatability of applied linings

A hard copy print out records all pertinent information and allows for verification of lining parameters

The Pipe After Lining

The rehabilitated pipe will never suffer from any of the problems it had prior to the process

The lining has an AWWARf design life of over 50 years

Lined Pipe (Showing service connection)

The Triton In-Situ spray lining process doesn’t block service connections

The cured lining was inspected via CCTV to ensure lining quality

Post Lining Inspection

Re Connection

The City then reconnected all pipe work and checked the couplings under pressure

Disinfection

Following the pressure testing of the new pipe and fittings the City disinfected / chlorinated the pipes in accordance with local and AWWA standards

Once the bacteriological samples had passed they reconnected the properties back to the main, removed the bypass, back filled the excavations and reinstated the surface

Results

Upon completion of the project fire flows were restored, the pipe has long term corrosion protection, chlorine residual is maintained, discoloured water complaints ceased, the problems will never return and customers are happy

Additional benefit - saving $1,575,000.00

City Personnel

Utility locatesBypass installationExcavationPipe removalPipe reconnectionBackfillSurface reinstatementBypass removal

Project Responsibilities Summary

Triton

Pipe cleaningPost cleaning cctv inspectionPipe spray liningPost lining cctv inspection

(City personnel gave assistance

to Triton with the above)

Triton Lining Systems LLC.

PO Box 1476 Carefree, AZ. 85377Tel: 407 928 9339

The City of Sac City

302 East Main Street, PO Box 37Sac City, Iowa 50583

Tel: 712 662 7593