WERF INFR4R12 Electro Scan Lateral Testing Project Kick-Off - - PowerPoint PPT Presentation

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WERF INFR4R12 Electro Scan Lateral Testing Project Kick-Off - - PowerPoint PPT Presentation

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WERF INFR4R12 Electro Scan Lateral Testing Project Kick-Off Conference Call Friday, June 29, 2012 Presentation Topics Project Team Project Overview and Research Objectives Schedule Efforts to Date Next Steps Project Team

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SLIDE 1

WERF INFR4R12 Electro Scan Lateral Testing

Project Kick-Off Conference Call Friday, June 29, 2012

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SLIDE 2

Presentation Topics

  • Project Team
  • Project Overview and Research

Objectives

  • Schedule
  • Efforts to Date
  • Next Steps
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SLIDE 3

Project Team

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SLIDE 4

Project Overview and Research Objectives

  • Research Objectives

– Compare Electro Scan results to actual infiltration estimates for laterals during rainfall simulation – Compare Electro Scan results to air pressure test results – Compare Electro Scan results to television inspection results

  • Project Overview

– Areas – Tasks

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SLIDE 5

Project Areas

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SLIDE 6

65th Street

  • Previously rainfall simulation

with “soaker hose” and dye water tested

  • Rehabilitate 75 laterals
  • Laterals to be lined in phased

approach (priority 1, priority 2)

  • Planned for rainfall simulation

with “soaker hose” and dye water testing between phases; flow measurements taken during tests

  • Flow metering at downstream

end of project

  • Clean outs installed external to

house at most locations

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SLIDE 7

Eagle Street

  • Previously rainfall simulation with “soaker hose” and dye water tested
  • Rehabilitate 42 laterals
  • Laterals to be lined in phased approach (all to property line, priority 1,

priority 2)

  • Planned for rainfall simulation with “soaker hose” and dye water testing

between phases; flow measurements taken during tests

  • Clean outs installed external to house at most locations

Eagle Street

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SLIDE 8

Project Tasks

  • Task 1: Coordinate with City Rehabilitation

Pilot Project

  • Task 2: Perform Electro Scan Lateral Tests
  • Task 3: Perform Low Pressure Air Lateral Tests*
  • Task 4: Data Analysis
  • Task 5: Prepare Final Deliverable
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SLIDE 9

Electro Scanning Approach

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SLIDE 10

Schedule

  • Commence pilot project design: Feb. 8, 2012
  • Hold public meeting for property owners in pilot area: Feb. 23, 2012
  • Advertise bid to install lateral clean outs: April 19, 2012
  • Bid opening: May 3, 2012
  • Issue City Contractor Notice to Proceed: May 29, 2012  Actual was June 8
  • Perform dye water/rainfall simulation tests: June 18 to June 29, 2012
  • Install clean outs and clean and inspect laterals: June 18 to July 27, 2012
  • Perform Electro Scan Tests and Air Pressure Tests: June 25 to Aug. 3, 2012
  • Develop Comparative Analysis of Lateral Testing Methods: Aug. 6 to Sept. 28,

2012

  • Quarterly Report # 1: Sept. 3, 2012
  • Develop Report: Sept. 3 to Dec. 7, 2012
  • Submit draft final report: Dec. 7, 2012
  • Response to draft report comments: Dec. 21, 2012
  • Quarterly Report #2: Jan. 1, 2013
  • Submit final report: Jan. 18, 2013
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SLIDE 11

Efforts to Date

  • Lateral Inspections
  • Metering and Weir Flow Device
  • Rainfall Simulation
  • Clean Out Installations and Lateral Cleaning
  • Electro Scan Training and Field Tests

– Low Pressure Air Test Evaluation – Water Exfiltration Testing – Revisions to Field Test SOPs

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SLIDE 12

Lateral Inspections

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SLIDE 13

Flow Metering

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SLIDE 14

Rainfall Simulation

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SLIDE 15

Dye Water Test

Stormwater Pipe Crosses over Sanitary Lateral

Private Property Public Storm water Sanitary sewer main Foundation drain Downspout connection to foundation drain Downspout to ground Yard slope to street Yard slope to house Catch basin curb Street sidewalk basement Lateral Sanitary sewer manhole

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SLIDE 16

Rainfall Simulation

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SLIDE 17

Clean Out Installation

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SLIDE 18

Contractor

  • Locate lateral
  • Install cleanout
  • Televise and clean lateral
  • Issue inspection report
  • Notifies BC/OTIE lateral is prepped for scan
  • Provide scheduled date for lining lateral

BC/OTIE

  • Review inspection report
  • Confirm lateral material
  • Plan daily work
  • Populate inspection form
  • Perform probe calibration check with

field data recording device Contractor

  • Review daily work

plan

BC/OTIE

  • Arrive at site, review CO conditions
  • Address site issues, open CO cap

and assess lateral conditions for testing

  • Confirm resident is aware of test or

not home

  • Confirm water source from City

water truck

  • Assess need to use Sea Snake

camera to evaluate lateral and plug conditions

  • Insert US plug into lateral and

inflate to 25 psi

  • Push DS plug into main
  • Inflate DS plug to 15 psi and pull

back to connection

  • Deflate plug and pull back 2 feet

toward CO

  • Inflate DS plug to 25 psi and leave

pump connected

Prep Work Phase

Testing Downstream Pipe

BC/OTIE

  • Insert probe through cleanout to lateral invert
  • Connect field computer to probe
  • Set zero on field computer
  • Push probe into lateral toward downstream

plug

  • Press RECORD on field computer
  • Start scan by pulling probe toward clean out

with reel

  • Maintain recommended scan speed for probe
  • Stop scan when probe reaches CO
  • Remove probe
  • Set GPS coordinates for US (SC for sidewalk

CO and PC for CO near house) and DS (ST) ends

  • f lateral in field computer
  • Confirm all site data is entered in field

computer form, including special notes

  • Review scan graph
  • Save scan by pressing Save Customer Info

button BC/OTIE

  • Hold air line and release

pressure in DS plug to empty water from lateral

  • Hold air line and release

pressure in US plug

  • Remove DS plug from

lateral

  • Remove US plug from

lateral

  • Contact property owner

to inform them test is complete and ask to confirm basement conditions

REVISED 6/28/12 Process for Gathering Lateral Inspection Data

BC/OTIE

  • Fill lateral with water to level

above pipe crown at CO, adding salt at same time

  • Set ground stake within 100

feet of lateral and confirm signal strength (10%)

  • Determine if exfiltration test

is feasible based on rate of water loss at CO

  • Stop water and perform

exfiltration test for 1 foot drop and record time on data sheet

  • Start water at rate that holds

desired level in CO

Testing Upstream Pipe

BC/OTIE

  • Insert SeaSnake into

upstream lateral to confirm any special conditions and remove camera

  • Estimate distance to deploy

ElectroScan plug upstream to within 5 feet of house

  • Insert DS plug into lateral and

inflate to 25 psi

  • Push US plug into lateral to

desired distance

  • Inflate US plug to 25 psi and

leave pump connected

  • Insert SeaSnake camera into

lateral up to US plug to monitor water level and air BC/OTIE

  • Insert probe through cleanout to lateral invert
  • Connect field computer to probe
  • Set zero on field computer
  • Push probe into lateral toward US plug
  • Press RECORD on field computer
  • Start scan by pulling probe toward clean out with

reel

  • Maintain recommended scan speed for probe
  • Stop scan when probe reaches CO
  • Remove probe
  • Set GPS coordinates for US (HC for location near

house) and DS (SC for Street CO) ends of lateral in field computer

  • Confirm all site data is entered in field computer

form, including special notes

  • Review scan graph
  • Save scan by pressing Save Customer Info button

BC/OTIE

  • Hold air line and

release pressure in DS plug to empty water from lateral

  • Hold air line and

release pressure in US plug

  • Remove DS plug from

lateral

  • Remove US plug from

lateral

  • Contact property
  • wner to inform them

test is complete and ask to confirm basement conditions BC/OTIE

  • Fill lateral with water to level

above pipe crown at CO, adding salt at same time

  • Set ground stake within 100

feet of lateral and confirm signal strength (10%)

  • Determine if exfiltration test is

feasible based on rate of water loss at CO

  • Stop water and perform

exfiltration test for 1 foot drop and record time on data sheet

  • Start water at rate that holds

desired level in CO

  • Remove SeaSnake camera
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SLIDE 19

Electro Scan Testing – Set-Up

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SLIDE 20

Electro Scan Testing – Scanning

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SLIDE 21

Electro Scan Testing - Scanning

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SLIDE 22

Electro Scan - Processing

Clean Out

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SLIDE 23

Observations Through First 2 Days of Testing

  • Low Pressure Air Test Replaced By

Water Exfiltration Test

  • Deep Clean Outs
  • Clean Outs with Poor Access
  • Fresh Water Ion Availability
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SLIDE 24

Contractor

  • Locate lateral
  • Install cleanout
  • Televise and clean lateral
  • Issue inspection report
  • Provide scheduled date

for lining lateral BC/OTIE Does Inspection Report indicate any of the following?

  • Roots
  • Cracks
  • Missing pipe
  • Displaced joints

Contractor

  • Recommend date and

time for lateral air pressure test to minimize impact to work schedule

DRAFT Process for Determining Ability to Air Test Lateral – Prior to Field Tests

BC/OTIE Recommend NO AIR TEST and document in record for lateral

YES NO

BC/OTIE Inform Contractor that Air Test will be attempted on

  • lateral. Request

contractor assistance with inserting test bladder in main to isolate lateral connection

Conclusion from Field Test: Replace low pressure air test with water exfiltration test

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SLIDE 25

Advantages of Water Exfiltration Test

  • ver Low Pressure Air Test
  • Electro Scan set up includes plugging lateral

test section and filling with water already

  • Exfiltration test provides better comparison to

infiltration estimates made during rainfall simulation (gpm rather than pass/fail air test)

  • Observed CCTV defects suggest these 80 year
  • ld vitrified clay laterals would NOT have

passed air test

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SLIDE 26

Next Steps

  • Continue Electro Scan and Water Exfiltration

Tests

– Schedule dependent upon rehab contractor – Prioritize on full lateral scan potential – Upload all completed scans several times daily – Review processed scan graphs and data – Develop summary chart for property test results