HomeMy WebLinkAboutMINUTES - 05021995 - 1.44 }
TO: BOARD OF SUPERVISORS C�6/
ont
Costa
FROM: HARVEY E. BRAGDON County
DIRECTOR OF COMMUNITY DEVELOPMENT � �`�
DATE: May 2, 1995
SUBJECT: Ratification of the Zoning Administrator' s Decision Regarding Shell Oil
Company' s Compliance with Conditions of Approval (LUP 2009-92)
SPECIFIC REQUEST (S) OR RECOMMENDATIONS) & BACKGROUND AND JUSTIFICATION
RECOMMENDATIONS
Ratify the Zoning Administrator' s decision that Shell Oil Company
has complied with Condition of Approval #22 for the C5 Tank.
FISCAL IMPACT
None.
BACKGROUND/REASONS FOR RECOMMENDATIONS
When the Board of Supervisors approved the Land Use Permit for
Shell Oil Company' s Clean Fuels Project (County LUP #2009-92) , the
Board specified that the Zoning Administrator' s decision regarding
several conditions of approval be placed on the consent calendar
for ratification. As directed by the Board at the October 4, 1994
meeting, the Zoning Administrator' s decisions discussed herein have
been placed on the Zoning Administrator' s agenda for May 1, 1995.
Any comments received at the meeting will be forwarded to the
Board.
7
CONTINUED ON ATTACHMENT: %% YES SIGNAT
RECOMMENDATION OF COUNTY ADMINISTRATOR RECOMMENDATION OF BO COMMITTEE
APPROVE OTHER
SIGNATURE (S) :
ACTION OF BOARD ON May 2 , 1995 APPROVED AS RECOMMENDED x OTHER
VOTE OF SUPERVISORS
I HEREBY CERTIFY THAT THIS IS A
x UNANIMOUS (ABSENT TRUE AND CORRECT COPY OF AN
AYES : NOES : ACTION TAKEN AND ENTERED ON THE
ABSENT: ABSTAIN: MINUTES OF THE BOARD OF
SUPERVISORS ON THE DATE SHOWN.
Contact Person: Catherine Kutsuris - 646-2036
Orig: Community Development Department ATTESTED May 2 , 1995
cc: Health Services Department: RMPP PHIL BATCHELOR, CLERK OF
_Shell Oil (via CDD) THE BOARD OF SUPERVISORS
AND UNTY MINISTRATOR
BY - DEPUTY
Ratification of decision on Shell Oil Company
April 25, 1995
Page Two
Condition of Approval #22 : Hazard and Operability Study
This condition requires Shell Oil to prepare a Hazard and
Operability Study and accident consequence analysis for all
elements of the Clean Fuels Project with the exception of the
office building, the control rooms and the maintenance/warehouse
buildings .
Shell Oil Company completed the required study for the C5 Tank.
This information was evaluated by the Risk Management and
Prevention Program Team of the Health Services Department. Their
review included a detailed examination of the hazard analyses and
off-site consequences as well as scrutiny of all the programs or
aspects of the Company (e.g. , operating procedures, preventive
maintenance programs and operator training) which are designed to
prevent or mitigate accidents or process anomalies . The review
included document assessments, management and operations personnel
interviews and process "walk through" to verify documentation.
The Health Services Department made several recommendations to
reduce the probability or severity of accidents (refer to the
attached HSD memorandum) . These recommendations were accepted by
the Zoning Administrator and will be required of Shell, Oil . The
Health Services Department will conduct follow-up field inspections
to ensure that all recommendations have been followed.
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4/17/95
Contra Costa County
• Health Services Department
ENVIRONMENTAL HEALTH DIVISION
'4 COUI1'�
OCCUPATIONAL HEALTH/HAZARDOUS MATERIALS
TO: Catherine Kutsuris, County Zoning Administrator,
DATE: April 17, 1995
FROM: Lewis G. Pascalli, '
Deputy Director
Health Services Departm Hazardous Materials Division
SUBJECT: CONSENT ITEM FOR SHELL REFINERY CLEAN FUELS PROJECT,
CONDITION #22 , C5 STORAGE TANKS
Executive Summary:
The Contra Costa County Health Services Department (CCCHSD)
Hazardous Materials Risk Management and Prevention Program Team has
completed the Clean Fuels review for the Shell Martinez
Manufacturing Complex' s C5 Storage Tanks, scheduled startup date of
May 9 . Shell submitted a summary of the C5 Storage Tanks HazOp to
your office on March 16, 1995 with a copy to CCCHSD.
Process Description:
The C5 Storage Tanks are located in the northeastern portion of the
Shell Martinez Manufacturing Complex. The purpose of the C5
Storage Tanks is to store pentane and other C5s, which will be used
in the final gasoline blending.
The C5 Storage Tanks consist of three eighty foot diameter spheres
and pumps to transfer the C5s to gasoline blending or to tankcar
loading. The C5s will take the place of higher volatile compounds,
such as butane, in the new gasoline blend.
CCCHSD Findings:
My staff has performed a detailed line-by-line review of the Hazard
and Operability (HazOp) study performed for the C5 Storage Tanks .
Design of safety systems as well as operational and maintenance
issues have been addressed. Additionally, my staff has inspected
the unit to verify that the construction so far conforms to the
design specified.
As a result of the review performed by the Risk Management and
Prevention Program Engineers, the following changes are required to
reduce the probability or severity of accidents to less than
significant :
Shell C5 Tanks, Page #1
1 . The C5 Storage Tanks are designed for a pressure of 20
pounds force per square inch gauge (psig) . These spheres are
designed to relieve to the flare header under normal operating
conditions at 18 psig. Under upset circumstances the spheres
could release C5s to the atmosphere, since the final
protection for the spheres relieve to the atmosphere at a
pressure of 20 and 21 prig. The flare header is designed to
operate at 3 to 4 psig at normal conditions, but when there is
a major upset the flare header pressure could run as high as
21 psig. During these upset conditions the C5 storage tanks
would be unable to relieve to the flare header and could
potentially relieve to the atmosphere . Shell has added check
valves to mitigate the possibility of the flare header gases
backflowing to the C5 storage tanks . Shell also has fire
water deluge valves on the spheres to keep the spheres cool in
case of a fire and is able to flood the spheres with water to
help prevent a release of C5s .
CCCHSD believes that ideally the spheres should have been
designed at a high enough pressure to always be able to
relieve to the flare header. Alternately the flare header
should have been designed to accommodate potential pressure
surges from the C5 storage tanks . Either of these design
considerations would have ensured that the spheres could
always relieve to this header.
Shell has designed the spheres with redundant pressure
indication and controls to keep the pressure below 15 prig.
Shell, also, has designed ways to cool the sphere if there is
a fire to prevent the pressure from rising high enough where
there could be a release to the atmosphere.
CCCHSD is recommending the following items to decrease the
risk of over pressuring the C5 tanks and a release to the
atmosphere :
l .a. The check valves to prevent backflow from the flare
header should be inspected at a minimum during every
turnaround.
l .b. Shell is to provide to CCCHSD, by June 30, 1995, the
protections in place for preventing butane and other Cos from
other process units from entering the C5 storage tanks .
1 . c . Shell is to test the pressure instrumentation on the
storage tanks (PI-2506, PI-2521 and PI-2533) frequently enough
to ensure a minimum of 95o availability of these pressure
instruments and associated alarms .
l .d. Natural gas is the backup blanket gas for the storage
tanks . If there is a loss of instrument air to the control
valves for the natural gas to the storage tanks, both control
Shell C5 Tanks, Page #2
valves will fail open. The pressure of the natural gas header
is higher then the relief pressure of the pressure safety
valves, that go to the atmosphere on the storage tanks . If
both of the control valves would fail open, the relief valves
could relieve and there would be a gas release to the
atmosphere . Shell is to investigate and report the findings
to CCCHSD for modifying the failsafe position of one of the
natural gas control valves to fail close, upon loss of
instrument air.
Implementing the above items, along with the safeguards that
Shell has designed into the C5 storage tanks will reduce the
risk of an offsite exposure. With these changes CCCHSD will
be able to accept the project for the storage tanks .
2 . CCCHSD recommends that the next Modified Hazard Review for
the C5 storage tanks be documented as thoroughly as a HazOp.
Shell C5 Tanks, Page #3