HomeMy WebLinkAbout06.a.3) Receive 2014 Collection System Sanitary Sewer Overflow Annual ReportAnnual Report of
Sanitary Sewer Overflows
Ann K. Sasaki
Collection System Operations Department
February 19, 2015
Central Contra Costa Sanitary District
• 2014 Sanitary Sewer Overflows
Fill, I+V VYCrIIVW,
FKJ.L/ Pur 1VV 11111CJ
LNo umpi ng station or
city overflows
S
6. a.3)
2/13/2015 11:08:46 AM
• Comparative Data for 2014 from State Database
# of Overflows 4,679 1,296 49
Total Volume 11,345,975 6,401,196 13.501
(gallons)
Average per 100 5.3 7.7 3.27
miles
Average Volume 2,424 4,900 275
per SSO (gallons)
`Info from CIWQS as of 1/31/2015
• Overflows Comparison 1999 - 2014
NUMBER OF OVERFLOWS
180 162
160 143 135
140 - 123
00 - .,.
120 107
100' —= 81 86
80 at 73� .rte
`63
60 `43 49 - 49
0
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
I.�col
2
• Overflow Quantities
Greater than or equal 3
to 1,000
Between 100 and 999 16
Between 10 and 99 28
Less than 10 2
Total Overflow Volume 13,501 gallons
Reduction in total volume of over 70%
2/13/2015 11:08:46 AM
P
18
22
6
48,816 gallons
• 2014 Overflow By City and Cause
Walnut Creek
San Ramon
Pleasant Hill
onnda
Moraga
Martinez
Lafayette
Danville
Alamo
0 4 8 12 16 20
Number of Overlbws
■Roots OGreus ■RegeRi- kfPeper/Debrle ODther Plug
V
3
2/13/2015 11:08:46 AM
kv2014 Overflow Causes
0%
A61, F Roots
Grease
Rags /Rock /Paper /Debris
Other Plug
86X
D
• 2014 Overflows by Pipe Size, Type, and City
15
12
9 ,
6 —
7
3 1 2
t 1 1
O t t
Alamo Danville Lafayette Martinez Moraga Onnda Pleasant Hill San Ramon VVI Cro k
08' ABS 06' ACP 08' ACP 416' CIP 1116' DIP 08' DIP 06' HDP
■8' HDP ■8' PVC 06' VCP ■a' VCP 11110' VCP 06' VCPL
D
0
2/13/2015 11:08:46 AM
• Category 1 Overflows
(Any volume of wastewater that reaches the waters of the state)
Updated through December 2014
Year. 2010 2011 2012 2013 2014 14
Total Oi Fs by
year. 1 12 j 1 1
iz
YTD comparison: i 4 81 1 1
JAN 21 0 0 d 10
FEB
MAR 21 d 1
APR 1 01 11 Odi a
MAY 1
JUN 1 0 d I e
JUL
AUG 1 1
SEP C 1 4
OCT 1
NO 1 1 1
OE 1 1 2
o'
)AN FEB MAR APR MAY JUN JUL AUG SEP OCr NOV DEC
-6- 2010 - ♦2011 -A-2012 -01- 2013 -W -2014
D
•CSO HIGHLIGHTS
WW'd 218 miles of sewers
CD=
5
Conducted survey of 100 % of all customers' emergency calls
213 Customer Surveys were sent to ratepayers. 76 surveys were
submitted for a return rate of 36%
Average Customer Service rating was 3.86 out of 4.0
Received a rating of 4.0 for 6 months of the year
Average response time was 37.5 minutes