HomeMy WebLinkAbout08.a.2) Report on status of sinkhole repairs in Central San’s service area and lessons learned from the Miner Road sinkhole in Orinda, as requested by the Board at the April 20, 2017 Board meeting. (.h► �•�++fir
8.a.2)
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6 17 WIN R STO M DAMAG
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MAY 4 2017
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EdgarJ. LPE
J CProjects Division Manager
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Paul Seitz, PE
Collection System 'Division Manager
Shari Deutsch
Risk Management Administrator
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2016= 1 7 WINTER STORM DAMAG MA
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District'Boundary
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Walnut Creek
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CHRONOLOGICAL EVENTS SUMMARY
• Rheem Blvd. / Moraga Rd . Sinkhole in Moraga
• March 13, 2016 due to failure of city storm pipe, District
sewer is in good condition
• N . San Carlos in Walnut Creek
• January 11 , 2017 due to trench failure
•
Miner -Road Sinkhole in Orinda
a January 11 , 2017 due to failure of City 84-inch CMP
Storm pipe
• St. Mary's College Sinkhole in Moraga
• April 10, 2017 due to failure of District's 27-inch sewer
pipe
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RH m BLVD. MORAGA SINKHOLE
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s Nearby sewer not damaged, Moraga will need to replace portion of sewer to facilitate Storm
Drain repair.
• Board approved utility agreement on January 26, 2017 for approximately $38,000.
Moraga has not yet completed repair. The Town is waiting for Caltrans approval, who
administers federal emergency funds on behalf of the Federal Highway Administration to solicit
bids from prospective contractors to repair the Sinkhole. Caltrans is aware that the Town needs
to receive approvals by early May 2017 to maintain the project schedule and complete repairs
during this summer.
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JANUARY 11 2017 STORM CAUSES
SINK HOLE — MINER RD . ORINDA
WEATHER
STORM CAUSES SINKHOLE, CSO responded immediately and
SEWAGE LEAK IN ORINDA installed bypass pumps/piping. Started
L f G+, V Tweet � 24-hr monitoring of site.
• Engineering staff evaluated repairs and
coordinated with the City of Orinda.
• Initial sewer repairs consisted of 30 feet
= installation of the 15" and 18" sewer.
• Central San agreed to pay for sewer
work only or install sewers with a
Central San contractor.
� .: Ongoing persistent heavy rain events
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prevented immediate repairs.
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MIN R RD. ORINDA (F RUARY 2017 S ORM)
Heavyrain, intense winds cause mayhem in
Bay Area
By Sarah Ravani.Peter Fimrite and gran 5erno#lsky Updated 8:15 prn.Tuesday,February 7,2017
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14.1pa Myer expected
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Then on February7thata r��imateI approximately
6:30 am
three homes were flooded along Miner
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Creek is F
Headwalls Partially•
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Sewer still bypassed
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Gas still bypassed
Wester temporarily shut dawn
MINER RD. QRINDA REPAIR O
AS IMPACTED BMILESTONE E
Initial Response: in January 2017 (before other storms)
• Option A:
Replace 30-ft each of the 15" dia. and 18" dia. Sewer after city replaced storm drain pipe
CSO Bypass pumping around sink hole and creek to avoid SSO
After second storm in February:
• CSO continues bypass pumping around sink hole and creek to avoid SSO using Rain for Rent contractor
• Option B: District designed a permanent creek crossing using pier supported steel casings and new sewers
• Option C: Rerouting sewers (abandoned due to high cost, topography, and ROW/permits, etc.)
Design issues arose with the City of Orinda and impacted surrounding properties: Several alternatives evaluated:
City re-designed for larger CMP Storm Drain or oval piping
City then re-designed to concrete box culvert
City then re-designed to concrete box culvert with overflow piping and storm manholes to accommodate neighbors
City then considered installing temporary bridge to re-open Miner Rd. and postpone repairs for up to three years
City dealt with many permitting and right-of-way issues
City coordinated and worked with CalTrans regarding funding requirements
Current plan in progress being constructed
• Option D:
Install two new sewers on top of City's new final culvert design independently from City's contract due to
CalTrans/FEMA requirements
Using same contractor as City (Bay Cities P&G) due to emergency nature of project
CSO continues bypass pumping around sink hole and creek to avoid SSO using Rain for Rent contractor
----------
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CENTRAL SAN OPTION B REPAIR PLAN
'row,
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A SEWER PIPE CROSSING ELEVATION ..._........_,........
+7c,441, !/ �l%—ow
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Designed permanent fisc and received quotes. Total estimated costs up to $650,000
0 Environmental Review and Permitting considerations i.e.; CEQA and US Army Corps
of Engineers) are required
0 Potential conflicts with City emergency contractor and schedule
0 Upgrades and betterment not covered by FEMA and calOEs
MINER RD. - CITY FINAL DESIGN
OPTION D
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EAST WALL ELEVATION
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City contractor mobilized on April 19, 2017 and started construction on April 24, 2017
See attached City of Orinda March 14, 2017 presentation by Larry Theis
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OPTION D IS CURRENTLY BEING
IMPLEMENTED
•
Lea st Net Cost to Central San
• . Most cost recovery from both FEMA and
CalOES
• Least Risk to District from SSO avoidance
• Permanent Fix
• Best Solution in coordination with City of
rinda
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COST ANALYSIS FOR OPTIONS
Information to be submitted at Board meeting
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ST. MARY' S COLL GE MORAGA SINK HOL
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responded immediately and s
sinkhole on April
• Contractor mobil 'ized arepair n April
Staff submitted request foPublic Assistance
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LESSONS LEARNED F WINTER STORM
SINKHOLE EVENTS
Less coordination Faster execution
1 Single agency required
More coordination Slower execution; less control
2 Multi-agency required of progress
Importance of early Opportunity to maximize
Multi-agency with coordination, and financial assistance and better
federal and or state tolerance for evolving coordination and use of public
3 grant conditions funds
FEDERAL AND STATE DISASTER $$
Programs Available to ,Ce ntral San :
• FEMA — Public Ass- istance (pays 75%)
• CaIOES — Calif. Disaster Assistance (pays
18E75%)
• Local Share is 6.25%
• Events eligible to recovery:
• Miner Rd .
9 N . San Carlos
St. Mary's (TBDOlt-,
?)
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TH PU IC AS ISTANC PA PROC SS
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ip 40 40
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f urds to Reci.p er t
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, Suhre clpiant complot s
r' Reulolerrt C Ur-VJ Ur Ug work and requests
Applicant 13heli n s Closeout,Gf its project(s)
Applicants submit Revvient certifies
Rewests ror Public r�r,pl icant #dentlfies completion(within
Preliminary a ���� ��. 1 ithi n 0 �.i nd roports all iso does or wojoct Assessnie.nt diis of Gecr'
l� ati uri'l daniage a1.1onr�and FFNI A
(within 60 oda)s of closes projed1'! ]
FEMA apprEives Kickott Meettrigj
Appllcanr` RPAs FEMA closes
e uigt 4wittVirl 30 Develop prr� l cop? the ApplbDant
days n-f n ni.s. FEMA conrlimts. or orp; and C;Osts
K#cko l eFu1ti rCMA clo.sops tive
Pros Identlal lthi y FEMA and Rwr iPiant Disastot,PA ProWari-r
Declatation of RPA approval: cOni*!H r:* Award
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ELIGIBILITY CRITERIA
Applicant must be eligible .
PA is only for Public Entities
Facility or structure must be eligible .
• Applicant must own or have legal
responsibility to maintain it
Work must be eligible .
Applicant must have legal responsibility to do
the work
• Costs must be eligible . � V�
grams
Must be necessary and reasonable, noPPolicyblic � "
improvements allowed, reduced by all
applicable credits (insurance) etc.
FEMA CATEGORIES OF WORK
Aim
Permanent Work
Address an Restoration of.,
immediate threat: C Roads/'bridges
A Debris removal D Water control facilities
OB Emergency E Buildings/equipment
protective
measures F Utilities
G Parks, recreational,
and other facilities
Bypass
Pumping Sewer Repair
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EMERGENCY PROTECTIVE MEASURES
Criteria:
Must eliminate or lessen immediate threats to
lives, public health or safety
Includes temporary relocation of essential
services
Limited to 6 months' duration (extension may
be granted upon applicant's request)
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EMERGENCY PROTECTIVE MEASURES
Eligible Costs :
Overtime
Force account equipment usage
• Contracted work T&CsaDDIy�
Ineligible Cost:
• Regular time
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PERMANENT REPAIRS
• Only reimburses to pre-event conditions
• Cost of improvements/betterments excluded
• Regular staff time is included
•
D irect Administrative Costs are includ
ed
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REIMBURSEMENT STATUS
• Request for Public Assistance filed 3/17/17
•
FEMA/CalOES kickoff meeting held 4/19/17
• Next Steps:
FEMA Site Inspectors review and report to local
FEMA rep (this week?)
Local FEMA rep develops project worksheets, for
FEMA approval
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Central Contra Costa Sanitary District
May 4, 2017
TO: HONORABLE BOARD MEMBERS
VIA: ROGER S. BAILEY, GENERAL MANAGERI-___
FROM: JEAN-MARC PETIT, DIRECTOR OF ENGINEERING & TECHNICAL
SERVICES �,�,p
SUBJECT: CITY OF ORINDA PRESENTATION ON MINER ROAD SINKHOLE
Attached is a copy of the presentation given to the Orinda City Council by Larry Theis,
Director of Public Works at the City of Orinda, on March 14, 2017 on the Miner Road
Sinkhole and Emergency Culvert Repair.
Attached Supporting Document:
1. March 14, 2017 Presentation to Orinda City Council
ORINDA
Miner Road . Sinkhole and
Emergency Culvert . Repair.
Community Meeting — March 14, 2017 at 6:00 p.m .
Sleepy Hollow Elementary School
Larry Theis,, Director of Public Works
City of Orinda
Culvert Inspection — February 2014
���=y 84 diameter Corrugated
K Metal Pipe
Inspected as part of the
Storm Drain Plan
Determined some loss of
�v;. galvanization (rust) in the
moderate -to significant
corrosion range and some
Looking downstream at Headwall deformity
Report recommended prioritization ' Rated as Moderate
for rehabilitation in 5 years (Yellow) Priority Category
for City
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aal r'E �:�'E.;It BOX UI df ["�eter�high
RIK INAC E IN LET �Eley ' `'°
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Footings for Wall
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(typ) ��_; � __'� r L00KINt� DOWNSTREAM AT NEW HEADWALL ON
uF.Jr:. -: R FLE MATERIt"L FAIST SIDE OF MINER RD.
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EAST WALL ELEVATION
Timeline Going Forward
Obtain new environmental permitting
Finalize plan for temporary dam and creek diversion
Install creek diversion - dry out sinkhole site
Rough Grading for foundations. of culvert and headwalls -
Set Forms- and Rebar for box culvert and h
Pour concrete and allow curing time
Backfill over culvert and behind headwalls
Re-establish utility pipelines; install high flow pipes
New asphalt pavement for traffic
Remove temporary dam, restore creek flow, re-open to traffic
Follow up with re-,planting creek bank and decorative wall treatment
24/7 Construction Schedule — noise and light impacts
Weather permitting & barring gconditions
Completion between June 1 to, July 1 2017
MAO