HomeMy WebLinkAbout07.a. General Manager Report on Wet Weather Operations (Handout)TkrA 7 a.
Nandoa +)
Wet Weather Operations
Report
Dante Marchetti
Dave Robbins
December 6, 2012
Central Contra Costa Sanitary District
of Service Area
n
Rainfall
P
4.5pt'
4� �°{� p
7 83'
7 81"
4.5W e
7Martlnez5.67*
4.66'
reek
7 37'
24z Concord
6.72'
on
4 71'
z
5.67'
,tort l x\488"
Clayton
777'
On Lst4y4m
24
:1
San Ra- 4.71 �
J1(
680
End of November Storm
• 3 rainfall events between November 28 and
December 2
• Mountain View Drive, Lafayette
• High creek flows washed out road, sewer, & water
main
• 2,800 gallons Category 1 SSO
• Temporary bypass sewer installed
• Tarabrook Drive, Orinda
• Storm drain created a sinkhole; sewer damaged
• No SSO; temporary bypass installed
Collection System Operations
• No capacity related SSOs
• No Pumping Stations Overflows
• On -Call Crew responded to 22
Service Calls
Mt. View Drive, Lafayette
Mt. View Drive, Lafayette
3
, P-77
Mt. View Drive, Lafayette
r�
,mar -�►1 Jc'�` .. T -
't l --^ :�
is
4 ••M � tic - �' l._,. � '7{ �,- :7""{...�_�._ \-
- d-. %"�iG .i,
--A I t I.
l y
Sinkhole - Tarabrook Drive, Orinda
Treatment Plant Operations
• Rainfall
➢ 4.5+ Inches Of Rainfall (November 30 through December 2)
• Flows
Peak Event Instantaneous Flow = 185 MGD
➢ 24 -Hour (Sunday) Peak Flow = 110+ MGD
➢ Total Flow By- Passed to Basins = 71 MGD
➢ Reprocessed All Basin Inventory
Other Issues
• Heavy Grit Load Plugged Grit Pumps /Piping
• Minor Mechanical /Electrical Problems
Treatment Plant Operations
• Final Effluent Overflow From Outfall Manhole
➢Leak Reported by Tesoro Employee
➢Steel Bolts Stolen
➢Leak Occurred Over a Five -Hour Period
(Through To Two Bolt Holes)
➢Approximately 12,000 Gallons
➢Overflow Contained On -Site
➢Reported to RWQCB
0
Final Effluent Overflow From Ouffall Manhole
QUESTIONS?