HomeMy WebLinkAbout09.a.1)b) Receive the 2016 Collection System Sanitary Sewer Overflow Annual Report 9.a . 1 b)
ANNUAL REPORT OF SANITARY
SEWER OVERFLOWS
Paul A. Seitz
• - Division Manager
Collection System Operations Division
March 2, 2017
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40 ver I ows
2 . 63 per 100 Mi ,les
No Capacity Overflows
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COMPARATIVE DATA FOR 201 6
FROM STATE DATABASE
$,REGION2 ' -
Number of 3,710 1,067 40
Overflows
Total Volume 21,038,207 5,590,368 29,200
(Gallons)
Overflows per
4.93 7.2 2.63
100 Miles
Average Volume 5,678 5,264 736
per SSO (Gallons)
* Information from CIWQS as of 2/10/17
*� Does not include Sanitary District #2 Marin due to their misreporting
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OVERFLOWS COMPARISON
1999-2016
NUMBER OF OVERFLOWS
1801
162
160 - 143 '14
35
140 -� 123
120 107
100 _ $1 86
80 - 73 63
6043 49 48 49 43
37 40
4020
0
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2409 2010 2011 2032 2013 2014 2015 2016
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OVERFLOW QUANTITIES
Size of SSO (Gallo4 s) Number in 204�7_',
Greater Than or
4
Equal to 1,000 4
Between 100 and 999 16 12
Between 10 and 99 18 16
Less Than 10 5 8
Total Overflow Volume 89,172 gallons* 29,204 gallons**
* The S50 that occurred on July 13, 2015 was 71% (63,131 gallons) of the
total volume
� ** The S50 that occurred on January 11, 2016 was 65% (18,,975 gallons) of
the total volume
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s
2016 O
BY CITY AND CAUSE
Walnut Creels 10
Pleasant Hill 3
C3rinda 4
Martinez 2 1
Lafayette 7 - MID
Danville 2 2
i
Concord �
Alamo 1 1
0 4 8 12 16 20
Number of Overflows
El Roots o Grease 13 Rags/Rock/Paper/Debris o Other Plug
2016 OVERFLOW CAUSES
Other Plug,
Rags/Rock/Paper 10%
/Debris, 120
Grease, 5%
Roots, 73%
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2016 OV RF OWS
BY- PIPE S1�E , TYPE , AND CITY
15
12
9
3
6
8
3
3
Alamo Concord Danville Lafayette Martinez Orinda Pleasant Hill Walnut
Creek
1:18" ASS 081" CLS 06" ACP m 81' ACP m 811 DIP N 611 HDP
08"` PVC 0 6" VCP 111111111111118" VCS 0 1 0" VCP 1:1 21 CLC
CAT GOR1 OV RFLOW
(ANY VOLUME QF WASTEWATER THAT REACHES THE WATERS OF SHE STATE)
Updated th,rough December 2016 �
Year: 2012 2013 2014 2015 2016 8 -
Total OJFs by year: 8 1 1 5 6-
YTD
YTD comparison: $ 1 1 5 6 7 -
JAN0 0 0 D 1 6
FEB 0 fl 0 1 0
MAR 1 U 0 1 Q i
APR 1 4 D 0 0 a
MAY 0 U 0 1 2 �
JUN 0 0 0 0 1 3
AUL 0 D Q 1 0
47
AUG 1 0 0 p 0 z -
SEP 0 0 0 0 0
1
OCT 3 Q Q Q 0 �
NOV 1 1 0 1 1WIN
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DEC 1 0 1 0 1 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
--11-2p12 -l--2013 2014 -40-2025 =3±0=2016
Completed 662 miles of scheduled cleaning footage and 161 miles of routine cleaning
footage.
Cleaned 823, miles of sewers .
CCTI!"d 194 miles of sewers.
Completed 120 spot repairs and 117 structure adjustme.nts.
Accomplish,ed over 20,900 cleaning schedules and work orders that we re completed on
schedule 99% of the time.,
Received and cleared over 23,700 USA requests on time.
Completed 907 services on vehicles and equipment. DOT regulated services were
completed on schedule 100% of the time. Uptime for vehicles was greater than 90%.
Conducted survey of 100%a of all customers' emergency calls,.
216 Customer Surveys were sent to ratepayers. 82 surveys were
submitted for a return rate of 38%.,
Average Customer Service rating was 3.92 out of 4.0.
Received a rating of 4.0 for 3 months of the year.
Average response time was 37.4 minutes.
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