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TO: BOARD OF SUPERVISORS '+
r Costa
FROM: J. MICHAEL WALFORD, PUBLIC WORKS DIRECTOR . County
DATE: June 19, 1984
SUBJECT: Problems Resulting from Backup of Sewer. Lines
Board Referral : April 3, 1984
Specific Requests or Recommendations & Background & Justification
RECOMMENDATION
Acknowledge Receipt of Report
BACKGROUND
On April 3, 1984, "the Board requested the Public Works Director to report on what preventive
measures are utilized by the sanitation districts governed by the Board of Supervisors
to prevent sewage backup into homes. This request was precipitated by a letter received
from Mr. Ray C. Horne to the Board requesting the appointment of a task force to investigate
this problem in every sewer district within the jurisdiction of the Board.
The Environmental Control Division of the Public Works Department provides sewer service
to the County Sanitation Districts under the jurisdiction of the Board of Supervisors.
These sanitation districts are:
Sanitation District No. 5 - Port Costa,
Sanitation District No. 15 - Bethel Island,
Sanitation District No. 19 - Discovery Bay, and
Sanitation District No. 7A - Zone 1 - West Pittsburg (Joint Powers to which the County
is a member).
One of the major tasks of operating and maintaining the sewage collection and treatment
system is to perform routine line cleaning maintenance on the collection system to prevent
sewer backups. In addition to this routine maintenance, the District standards (same
as the Central Contra Costa Sanitary District) require a backwater overflow device be
installed where the surface elevation of the nearest upstream sewer structure on the main
sewer is less than 12 inches lower than the lowest floor elevation of the building connected.
Essentially, this is a cleanout with a device designed to direct "backup" sewage to run
outside of the house, rather than inside. Where we suspect that there is a plumbing facility
inside the house tba_t is lower than the elevation of the cleanout, we encourage the resident
to install a check valve in their sewer line, in addition to the overflow device.
In reviewing plans for new projects, we attempt to have all new sanitary sewer collection
systems designed in such a way to divert the overflow onto the road surface and into storm
drains before backing up into the house laterals.
The Public Works Department does not feel the appointment of a task force to conduct further
investigation on this issue is necessary.
Continued on attachment: yes Signature:
Recommendation of County Administrator Recommendation of Board Committee
Approve Other:
Signature(s):
Action of Board on: June 19 , 1984 Approved as Recommended x Otherx
AUTHORIZED letter to be sent to Central Contra Costa Sanitary District
inquiring as to procedures implemented to prevent problems of this
nature.
Vote of Supervisors I HEREBY CERTIFY THAT THIS IS A TRUE
AND CORRECT COPY OF AN ACTION TAKEN
X Unanimous (Absent IV ) AND ENTERED ON THE MINUTES OF THE
Ayes: Noes: BOARD OF SUPERVISORS ON DATE SHOWN.
Absent: Abstain:
dbo.bo.horne.ref.3apr.t6 Attested
Orig. Div. : Public Works (EC) .R. OLSSON, COUNTY CLERK AND
cc: Public Works Director EX OFFICIO CLERK OF THE BOARD
Grand Jury
Mr. Ray C. Horne
27 Rheem Boulevard ,,,��y DEPUTY
Orinda, CA 94563 By ,
County Administrator ff
000148