HomeMy WebLinkAbout09.a. (Handout) Receive 2012 Collection System Sanitary Sewer Overflow Annual ReportItem q.a.
Annual Report of
Sanitary Sewer Overflows
Paul A. Seitz
Collection System Operations Department
March 21, 2013
Central Contra Costa Sanitary District
2012 Sanitary Sewer Overflows
r49 overflows — 3rd lowest in CCCSD
history
r 3.3 overflows per 100 miles
y No pumping station or wet - weather
capacity overflows
F. a.
(114ndom.f)
1
Comparative Data for 2012
from State Database
➢ Statewide (CIWQS as of 0310612013)
■ 4,891 overflows and total volume of 14,072,790 gallons
■ Average of 5.3 overflows per 100 miles
■ Average volume of 2,900 gallons per SSO for the year
➢ Region 2 — Bay Area (CIWQS as of 03106113)
■ 1,388 overflows and total volume of 10,668,165 gallons
■ Average of 8.2 overflows per 100 miles
■ Average volume of 7,700 gallons per SSO for the year
Overflow Quantities
Size of SSO (gallons)
Number
in 2012
Number
in 2011
Greater than or equal to 1,000
2
1
Between 100 and 999
19
9
Between 10 and 99
17
17
Less than 10
11
10
Total overflow volume
9,449 gallons
10,264 gallons
S
FA
Overflows Comparison
1999-2012
NUMBER OF OVERFLOWS
180 162
160 143 141
140 135
100 a 123
120 '�07
100 1 86
80-- 4 �� - _
60 _ —� 43
40 49
�� tr r
20
0
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
2012 Overflow By City
and Cause
Walnut Creek ti t
San Ramon
Pleasant Hill !Fl
Orinda 11 2
Martinez 3 z
Lafayette
Danville 5
Alamo ,1'
0 4 8 12 1s 20
Number of Overflows
O Roots o Grease o Rags/Rock/Paper/Tile o Other Plug (�
J
3
2012
Overflows by Pipe
Size,
Type, and City
18
15
12
,
s
6
,z
,o
3
0
Alamo
DanHlle Lafayette Martinez Orinda Pleasant Hill
San Ramon Walnut
Creek
■ 4" VCP
a 6" ACP o 6" VCP ■ 6" VCPL ■ 8" ABS
■ a" ACP
■a"
CIP ■8 "VCP O8" DIP o8 "HDPE ■a" PVC
C10" PVC
i
2012 Overflow Percentage
by City
❑ Walnut ❑ Alamo, 2% 0 Danville,
Creek, 24% 10%
o Lafayette,
■ San Ramon, 74&1 12%
2,
❑Pleasant
Hill, 6%
❑ Martinez,
10%
■ Orinda, 33% XL
2
Comparison
of Cumulative
Overflows
Updated through
December 2012
Y•ar 2009 2010 2011 2012
T ta: , F, by year 1
YM comparison 1
631
631
431 37
431 371
49
49
JAN
7
5 7
6
FEB
5
6 7
3
MAR
8
3 0
3
APR
10
5 1
3
MAY
JUN
8
5
2 1
4 3
2
2
JUL
AUG
2
4
1 4
2 3
3
5
SEP
OCT
5
0
2 3
3 2
0
6
NOV
DEC
2
7
5 3
5 3
4
12
I
2012 Overview
'w 37 days without a single overflow during 2012.
y "Quality Cleaning" philosophy and follow up with
CCTV quality assurance.
r Increased scheduled cleaning frequencies
where significant material was removed.
y Cleaned 4,301,049 feet of sewers.
a
5
2012 Overview
'w 37 days without a single overflow during 2012.
y "Quality Cleaning" philosophy and follow up with
CCTV quality assurance.
r Increased scheduled cleaning frequencies
where significant material was removed.
y Cleaned 4,301,049 feet of sewers.
a
5
2012 Overview
➢ Current TV contract is focused on sewers in Walnut
Creek area.
➢ Engineering continued projects to rehabilitate sewers
— more focus on lines with overflows and sewer lines
on frequent cleaning cycles.
➢ Responded to two potentially disastrous sewer
overflows over a 24 -hour period during heavy rains.
• On Mt. View Drive in Lafayette, installed within two hours a
temporary sewer bypass when road was washed away.
• On Tarabrook Drive in Orinda, installed a temporary sewer
bypass when a storm drain created a sinkhole and our
sewer was damaged.
Questions?
9