HomeMy WebLinkAbout07.a. (Handout) Treatment Plant Flood Control Protection Project7a.
(#Ond&zd
Item No. 7.a.
Treatment Plant Flood
Control Protection Project
April 4, 2013
Dana Lawson, PE
Senior Engineer
Central Contra Costa Sanitary District
Overview
• Purpose
• Interim Project — 2007
• Final Project — 2013 -2016
• Prop 1 E Grant Funding
• Flood Control District's Role
• CCCSD's Role
• Next Steps
Purpose
• Protect treatment
plant assets
• Continue treatment of
wastewater during a
storm event to protect
the public and
environment
24 hours
to disaster
Potential Damage $146M
A serious rain event could cause
up to $146M in damages!
Influent pumps located below grade
Final Effluent pumps located below the P &B
Building
2
Interim Project - 2007
• Desilted lower section
of Walnut Creek mainly
along CCCSD property
j (40,000 cy of soil)
• Raised western levee of
Walnut and Grayson
Creeks
Final Project — 2013 to 2016
• Raise western levee of
Walnut and Grayson
Creeks for a 500 -yr storm
event
• FCD analysis showed that
levees only have 30 -yr level
of protection
• Code requires minimum of
200 -yr plus 3' of freeboard
• -$2.2M
DRAFT
3
Final
Project -
HGL &
Location
r
eY.[R�z RZ+.if'i y•.•!w•M J]'�O
Central
Sanitation District Levees
on
Lower Walnut Creek
it
Prop 1 E Grant Funding
• Flood Control received Prop 1 E funding in
the 1St phase of distribution for 50% of the
total cost of a flood control project at Wild
Cat Canyon.
• Flood Control and CCCSD will split the
remaining at 25% each.
• Requires formal adoption of IRWMP
(Integrated Regional Water Management
Plan).
4
Flood Control District's Role
• Lead agency
• Grant application and administration
• Produce design documents
• Bid project
• Construction inspection and management
• 25% share of total project cost (- $550k)
CCCSD's Role
• Provide information as needed to Flood
Control District
• Review design and bid documents
• Construction coordination along fenceline
• 25% share of total project cost (- $550k)
J
Next Steps
• Staff recommends adoption of Resolution
today to comply with grant funding
requirements.
• Wait for announcement of Prop 1 E awards
in August.
• Review design by Flood Control 2013 -14.
• Bid 2015.
• Construction 2015 -2016.
on