Purpose
This procedure is to prevent a release of hazardous material
outside of secondary containment especially during severe
weather conditions.
1. Under Normal weather conditions and there is no excess
water in the tank farm area, all dike drains and roof drains
should be in the closed position.
2. In the event of rain or high probability of rain:
2.1. The Roof drains on the following tanks must be open
and the associated dike drains must be closed:
►
106
► 108
►
805
► 806
► 807
►
808
► 809
► 810
►
811
► 816
► 817
NOTE: Tanks 812, 813, 814, 815, 902 are “cone roof” tanks
and do not have roof drains.
NOTE: Tanks 902 and 107 are “internal floating” tanks and
do not have roof drains.
2.2. The Roof Drains should be opened just prior to the
rain event whenever possible.
2.3. If the Roof drains are not opened until after the rain
event has begun and water has accumulated on the roof,
the tank roof must be inspected for product or “sheen”
prior to opening the roof drain.
3. Operation of the Outfall valve.
3.1. Prior to opening the outfall valve
► Insure that monthly and quarterly storm water sampling
procedures have been met.
► Check the containment water for “sheen.” If sheen is
present, the contamination must be removed prior to
opening the outfall valve.
► All Dike drains must be closed.
3.2. Outfall valve may then be opened to allow storm water
to leave terminal area.
3.3. The release of storm water through the outfall valve
must only occur during daylight hours to ensure the
ability to observe sheen on the water.
3.4. If it becomes necessary to release water after dark,
permission from the Terminal Manager is required.
4. Following a rain event at the terminal
4.1. Release water from the containment pond with the
outfall valve if necessary to lower the water level
sufficiently to receive storm water from secondary
dike containment.
4.2. Ensure Outfall valve is closed.
4.3. Close all Roof Drains.
4.4. Inspect each secondary dike containment area for the
presence of sheen or other contaminants.
4.5. If no sheen is noted, open Dike Drain to allow storm
water release to the primary containment pond.
4.6. Once water is removed from Dike drain area – close
dike drains.
5. Tanks 805, 806, 808 and 902 are equipped with manually
operated storm water discharge pumps rather than dike
drain valves.
5.1. The conditions for operating these pumps are the
same as for opening the dike drain valves.
5.2. Basic Operation includes:
► Check for sheen on storm water
► If sheen is not present press the “start pump” button
on the control panel
► The red light will turn on indicating pump operation.
► The pump will automatically shut down when water
has dropped below the level of the pump float switch
setting. The red light will turn off indicating the
pump is off.
► Due to the interconnection of the dike pump
discharge system (example, 806 dike pumps to 805
dike, 805 pumps to 902 dike, etc.) it may be
necessary to re-start the pump after residual water has
accumulated in the pump sump pump area.
6. If sheen is noted in one of the secondary dike containment
areas:
6.1. The dike drain must not be opened.
6.2. The sheen must be reported and removed from the
storm water prior to any opening of the dike drain. It
may also be required that the storm water be pumped
and filtered through the oil-water separator after
removing the sheen.
6.3. The tank area will be inspected to determine and
remedy the source of the hydrocarbon.
7. The roof drain and dike drain must both be closed (even if
raining) when receiving product into a tank including:
7.1. Tank transfers
7.2. Pipeline receipts
7.3. Barge receipts
NOTE -- In the event that the roof of the tank must be
drained during product receipt the operator must:
► Inspect the roof area for sheen prior to opening the roof
drain.
► Physically stand by and continuously monitor the
discharge from the roof drain into the dike area to
ensure no sheen is evident in the released storm water.
► If sheen is noted do not open the roof drain and notify
the Terminal Manager. Steps must then be taken to
connect a hose from the roof drain discharge valve to
the water draw piping so the storm water can be
discharged to the oil-water separator.