HomeMy WebLinkAbout09.a. Receive 2012 Collection System Sanitary Sewer Overflow Annual ReportCentral Contra Costa Sanitary District
BOARD OF DIRECTORS
POSITION PAPER
Board Meeting Date: March 21, 2013
Subject: 2012 COLLECTION SYSTEM SANITARY SEWER OVERFLOW ANNUAL
REPORT
Submitted By: Initiating Dept. /Div.:
Paul A. Seitz, Collection System Collection System Operations
Operations Division Manager Department / Field Operations
REVIEWED AND RECOMMENDED FOR BOARD ACTION: e,4
C. Swanson
Provisional General Manager
ISSUE: The Central Contra Costa Sanitary District's (District) Sanitary Sewer Overflow
(SSO) Annual Report (attached) has been prepared for the District Board of Directors'
information.
RECOMMENDATION:
Receive the 2012 Collection System SSO Annual Report.
FINANCIAL IMPACTS: None related to this action.
ALTERNATIVES /CONSIDERATIONS: Not applicable.
BACKGROUND: The 2012 Collection System SSO Annual Report summarizes the
overflows that occurred in the District's sanitary sewer system during the period of
January 1, 2012, through December 31, 2012. This is the eighth SSO Annual Report;
however, it is no longer required to be submitted pursuant to the Regional Water
Quality Control Board's revised requirements. The report summarizes SSOs by the
number and size, the volume, the causes, the locations, and the trends. The collection
system experienced 49 overflows last year.
RECOMMENDED BOARD ACTION: Receive the 2012 Sewer System Overflow
Annual Report.
Attachments:
- Annual Report of Sanitary Sewer Overflows for Calendar Year 2012
- October 3, 2012 letter from San Francisco Bay RWQCB
CSO /C: \Users \danderson \Desktop \(Rev3) SSO Annual Rpt -2012 (2).doc
ANNUAL REPORT OF SANITARY SEWER OVERFLOWS FOR
CALENDAR YEAR 2012
The 2012 Collection System SSO Annual report summarizes the overflows that
occurred in the District's sanitary sewer system during the period of January 1, 2012,
through December 31, 2012. The requirements to submit annual reports for Sanitary
Sewer Overflows (SSOs) and Sewer System Management Plan (SSMP) Audits were
discontinued by the San Francisco Bay Regional Water Quality Control Board as per
the attached letter dated October 3, 2012.
Number and Size of SSOs
The total number of SSOs for the reporting period was 49. All of the SSOs were
associated with gravity sewers. No overflows were experienced as a result of
surcharging in wet weather conditions. The volumes of the SSOs are summarized as
shown on Table 1.
Table 1. Number of SSOs
Size of SSO (gallons)
Number
Percent of Total by Number
Greater than or equal to 1,000
2
4%
Between 100 and 999
19
39%
Between 10 and 99
17
35%
Less than 10
11
22%
Public portion of lateral
N/A
—
Total
49
100%
The volume of spills contained and returned to the sewer system, as well as the volume
reaching the waters of the State, is shown in Table 2.
Table 2. Volume of SSOs
Volume (gallons)
Percent of Total by
Volume
Total volume reaching waters
4,036
43%
of the State
Total volume not recovered but
not reaching waters of the
5,413
57%
State
Total
9,449
100%
Volume (gallons)
Total volume contained and
returned to sewer system for
1,880
treatment
This report does not include SSOs that occurred from private sewer service laterals
within the District jurisdiction that were caused by conditions in privately owned laterals
or on private property. The property owners are responsible for the condition and
operation of those sewer service laterals.
Cause of SSOs
The predominant cause of SSOs during the period of this report was roots. The
distribution of SSOs by cause is shown on Table 3.
Table 3. Causes of SSOs
Cause of SSO
Number
Percent of Total
Blockage:
Roots
37
76%
Grease
2
4%
Debris (rags, rock, paper)
6
12%
Debris from laterals
—
—
Vandalism
—
—
Construction debris
—
—
Contractor error
3
6%
Multiple causes
—
—
Subtotal for blockages
48
98%
Infrastructure failure
1
2%
Inflow and infiltration
—
—
Flow capacity deficiency
—
—
Cause unknown
—
—
Total
49
100%
Location of SSOs
The District's Engineering department is currently working on multi - phased rehabilitation
projects in the District's service area. The Collection System Operations department is
continuing its "quality cleaning" program as well.
There were no repeat overflows in 2012.
SSO Trends
The following graph shows a comparison of data for the current reporting period, 2012,
with previous reporting periods from years 2009 through 2011.
rigure i. i otai bbUs 2009 - 2012
Updated through December 2012
Year:
2009
2010
2011
2012
Total SSOs by year: 1
631
431
371
49
0 oral
JAN
7
5
7
6
FEB
5
6
7
3
MAR
8
3
0
3
APR
10
5
1
3
MAY
8
2
1
2
JUN
5
4
3
2
JUL
2
1
4
3
iii
AUG
4
2
3
5
SEP
5
2
3
0
OCT
0
3
2
6
NOV
2
5
3
4
ii i !� �M
DEC
7
5
3
12
iii
EaNUNa O. BROWN JR,
aoveRNOR
QAUIOaarA N1AITtl{W 1>fOOR10Ul2
Water Boards 41C.1-Al /CA
iNVIRONMIRTAt /ROTFarbN
San Francisco Bay Regional Water Quality Control Board
October 3, 2012
To: Attached Mailing List
Subject: Discontinuation of Requirements for Annual Reports of Sanitary Sewer
Overflows (SSOs), and Annual Sewer System Management Plan (SSMP)
Audits
This letter notifies you, as an agency or entity that owns or operates a sanitary sewer system
in the San Francisco Bay Region enrolled in State Water Board Order No. 2006- 0003 -DWQ
(Sanitary Sewer Order), of the discontinuation of requirements for annual SSO reports, and
annual SSMP audit reports.
This discontinuation of requirements is effective immediately. This means there will be no
need to submit the annual SSO report and SSMP audit report due in 2013. Furthermore, this
discontinuation of requirements effectively rescinds, except for enforcement purposes, the
Regional Water Board's Water Code section 13267 orders issued on November 15, 2004,
and July 7, 2005.
Please be aware that you are still required to comply with Provision D.13(x) of the Sanitary
Sewer Order. Provision D.13(x) requires enrollees, regardless of the population served, to
conduct an SSMP internal audit, at a minimum every two years, and prepare an audit report
to be kept on file. The Sanitary Sewer Order requires that the audit shall focus on evaluating
the effectiveness of the SSMP and the enrollee's compliance with the SSMP requirements
identified in Provision D.13, including identification of any deficiencies in the SSMP and
steps to correct them. Because of the Regional Water Board's previous more frequent
requirement for annual SSMP audit reports and somewhat different submittal schedule
compared to the Sanitary Sewer Order, the following reconciles the minimum schedule for
the next SSMP audit report to ensure compliance with the Sanitary Sewer Order. Future
audits reports would be due two years after the dates listed below.
If your collection system serves a population greater than 2,500, you must complete
your next SSMP internal audit and SSMP Audit Report by May 2, 2014, The SSMP
internal audit shall cover calendar years 2012 and 2013.
For collection system serving a population of less than 2,500, the SSMP Audit
Report covering calendar years 2012 and 2013 must be completed by August 2,
2014.
Please note that if you own and /or operate more than one collection system, you must
maintain a separate SSMP audit report on file for each collection system enrolled under the
Sanitary Sewer Order.
JOHN MULLER, CNAIR 1 BRUCE H. WOLFE, EXECUTIVE OFFICER
1515 Clay St., Suite 1400, Oakland, CA 94012 1 www. waterboarda ce.gov /aantraoclacobay
4i RCavcuo P-
Discontinuation of Annual Reporting Requirements - 2 - October 3, 2012
Please note that the State Water Board is scheduled to consider amendments to the
monitoring and reporting program of the Sanitary Sewer Order in early 2013. If adopted as
currently drafted, enrollees will be required to include specific information in the SSMP
internal audits to satisfy compliance with Provision D. 13(x) of the Sanitary Sewer Order.
This information would include current and projected SSO reduction performance goals,
changes employed to meet target goals, and planned corrective actions to address the top
SSO causes. A copy of the proposed amended Monitoring and Reporting Program is
available at http: / /www.waterboards.ca.gov /water issues /programs /sso /index.shtml.
If you have any questions regarding our SSO Reduction Program requirements or the
contents of this letter, please contact Claudia Villacorta, Section Leader,
at cvillacorta (rb waterboards.ca.�ov or (510) 622 -2485.
Sincerely,
Lila Tang
Chief, Wastewater Division
Attachment: Mailing List
Copy to (by email only):
Ken Greenberg, USEPA Region 9, Greenberg. ken @epa.gov
Russell Norman, State Water Board, Russell .norman @waterboards.ca.gov
Victor Lopez, State Water Board, Lopez.victor @waterboards.ca.gov
Jim Fischer, State Water Board, Fischer.Jim @waterboards.ca.gov