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Asbestos Cement PipeStudy
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Outline
• EBMUD’s Asbestos Pipe Inventory and Leak History
• Asbestos Pipe Corrosion Studies to date
• Identification of an AC Pipeline Replacement Plan
model
sample
replace
AC Pipe Replacement Plan
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EBMUD:
East Bay Municipal Utility District
•4,200 miles of pipe
•1.3 million people
•90% of water supply
from Sierra foothills
•Alameda and Contra
Costa Counties
•331 square miles of
service area
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Distribution Pipeline Inventory
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Leak Summary
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• 1,150 miles
• Avg. 47 years old
AC Pipe Inventory
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• Avg. 126 leaks/year (18% of total EBMUD leaks)
• Avg. 11 leaks/100 miles/year
• Highest frequency leaks = > 70 years old; 4” dia.
Average
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7.8
5.6
7.16.5
6.0
9.4
14.3
18.518.8
15.3
9.9
6.2
0
2
4
6
8
10
12
14
16
18
20
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Month
Avera
ge A
C P
ipe L
eaks p
er
Mo
nth
0.0
0.5
1.0
1.5
2.0
2.5
Inch
es o
f R
ain
Average Leaks
Average Rain Data
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2009-2011 Collection & Testing
• 2009-2010: Collected 21 samples• 2011: Collected 16 additional samples • Size – various pipe lengths • All on Failed Pipes
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2009 – 2011 Samples
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Current Sample Collection (2012-2013)• Partnership with WRF• Different Water Quality Zones• 6” & 8” Diameters, Pre & Post 1970’s • Sizes: 3-in diameter coupons and 3-ft
long sections• 70 samples collected (to date),
primarily from “live” pipes w/o leak history
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Lab Testing and Acoustical Surveys
JDH Corrosion: Laboratory Services
Contracted to test up to 100 Samples
Battery of tests conducted includes stain, crush, tensile, flexural, density, pH, Scanning Electron Microscope (SEM), petrographic
Echologics: Pipeline Integrity Testing
Acoustical Pipeline Condition Surveys
Evaluated approx. 2 miles of pipe at 22 sites
Stain tests conducted to correlate with Echologics survey results.
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2012-2013 – Samples w/
Echologics Surveys
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Danville – AC Pipe Replacement
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Danville – AC Pipe Replacement
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Danville – AC Pipe Replacement
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AC Pipe Corrosion Measurements
Inner Diameter (ID) ThicknessOuter Diameter (OD) Thickness
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Stain Test and Elemental Composition
ID OD
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Crush Strength Test
Crush strength tests conducted on the pipe samples
indicated the all of the samples met the requirement of
as-manufactured (new) pipe for Class 150 pipe
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Flexural Testing
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Tensile Test
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EAST of HILLS versus West of Hills
AC Pipe
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Echologics Acoustic Surveys
Noise Source
Measure the sound velocity
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Stain Test
results
compared to
Ecologics
Surveys.
4 out of 6 pipe
samples (non-
break) have
good
correlation
vs.
4 out of 9 for
coupons
Street Name Location
Coupon or
3' Sample Diameter
Year
Installed
Echologics
% Loss
Stain
% Loss
Good
Correlation
Ech v Stain
Narcissus Court Castro Valley Coupon 6 1978 40% 0% No
Todd Court Castro Valley Sample 6 1976 58% 48% Yes
Lakeridge Road/La
Costa Avenue
Castro Valley Sample 6 1985 38%48% Yes
Nordell Avenue Castro Valley Coupon 6 1953 60% 29%
No
Wisteria Street Castro Valley Coupon 8 1963 21% 21% Yes
Greenway Drive Richmond Coupon 8 1977 11% 27%
No
Park Central Court Richmond Coupon 6 1978 15% 18%
Yes
Raton Court Richmond Coupon 6 1959 57% 38% No
Dublin Drive Richmond Sample
(Break)
6 1961 37% 84%
No
Encinal Drive Walnut Creek Coupon 6 1960 38% 48% Yes
Montin Court Walnut Creek Coupon 6 1975 29% 33% Yes
Leroy Lane Walnut Creek Coupon 8 1965 57% 19% No
El Suyo Drive San Ramon Sample 8 1976 22% 23% Yes
Tangerine Road San Ramon Sample 8 1964 28% 26% Yes
Wyndale Drive Castro Valley Sample 6 1955 35% 74% No
Carlwyn Drive Castro Valley Sample 8 1955 26% 58%
No
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AC Pipe Replacement
Plan
AC Pipe Replacement Prioritization
AC Pipe Sample Collection
Prediction Model
Pipe Replacement Plan
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Prediction Model
Model Input Data:
1. AC Pipe Database – Installation Age Attribute
2. Agency-Specific Corrosion Rates for AC Pipe
3. Pipeline Class Safety Factor Tolerances
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AC Pipe Study Timeline & Next Steps
• Ongoing thru 2013– Collect and Test AC Samples– Investigate Replacement/Rehab Methods– Investigate Water Quality Optimization
• 2014 – Complete WRF/EBMUD AC Pipe Study– Pilot replacement/rehab method
2008 2009 2010 2011 2012 2013 2014
Significant
Leak EventsPhase I
Initial Study
Phase I
Follow-Up Study
Current WRF Funded Study
Focused AC Replacements
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Asbestos Cement Pipe Corrosion Study
Rolando Bueno, P.E.
Pipeline Infrastructure Division
EBMUD
510 287-7038