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INTEGRATED CONTINGENCY PLAN Maneuver Training Center

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amount of assistance requested. Each company maintains a relatively current inventory of spill<br />

equipment at their facility and testing logs to verify equipment operation. Inventories of spill<br />

equipment are included in Appendix G.<br />

10.5 WORST-CASE DISCHARGE SCENARIO [9 VAC 25-91-170 A.11]<br />

10.5.1 Worst-Case Discharge Assessment<br />

In accordance with ODCP requirements, this section presents the hypothetical worst-case<br />

discharge assessment. For the purposes of this Plan, it is assumed that under the worst-case<br />

discharge scenario, “adverse weather conditions” would occur during a 25-year, 24-hour rainfall<br />

event. The worst-case discharge would be the instantaneous release of the largest AST at MTC-<br />

Fort Pickett containing 4,000 gallons of heating oil. MTC-Fort Pickett has three 4,000-gallon<br />

concrete vaulted tanks located at Buildings 1613, 467 and 135.<br />

For a worst case discharge scenario, a breach in the secondary containment system or an<br />

overflow of the system (the “slosh factor” cited in VDEQ Guidelines for the Preparation of the<br />

ODCP) is assumed to occur based on past historical information related to secondary<br />

containment systems. For the purposes of this assessment, the volume of the release required by<br />

VDEQ guidelines is 22% of the worst-case discharge (4,000 gallons), which equals 880 gallons.<br />

Worst case discharge = volume of largest tank x 0.22<br />

= 4,000 x 0.22<br />

= 880 gallons<br />

10.5.2 On-Site Discharge Containment Strategy<br />

A worst-case discharge that is not secondarily contained could produce a large volume of liquid<br />

flowing towards the surface drainage conveyences. Containment of sheetflow over pervious<br />

surfaces is not easily accomplished. However, if time permits, shallow trenches or sumps may be<br />

dug in the flow path to recover as much released liquid as possible. Once the liquid reaches the<br />

surface drainage ditches, check dams or underflow dams may be constructed. Impervious materials<br />

(such as sandbags, a water proof covering, or an inflatable bladder) will be placed in front of the<br />

culvert to prevent a release from being discharged off-site. Portable recovery devices (such as<br />

explosion proof pumps or vacuum trucks) will be positioned and activated to collect liquid that has<br />

been temporarily contained. Available spill response equipment (such as sorbent booms, pillows,<br />

pads, and clay) will be deployed to recover residual product as needed.<br />

10.5.3 Off-Site Discharge Containment Strategy<br />

If required, MTC-Fort Pickett will obtain the services of a spill response contractor to assist with<br />

spill containment, recovery, and/or cleanup. The spill response contractor may install spill<br />

response equipment (which may include floating containment booms) along or around any<br />

natural resources identified in Section 14.0 to attempt to protect them from the spill.<br />

MTC – Fort Pickett<br />

Integrated Contingency Plan<br />

Blackstone, Virginia<br />

October 2009 Page 51

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