NATIONAL RESPONSE TEAM

Of The National Oil and Hazardous Substances Pollution Contingency Plan

G-OPF 2100 2nd St. S.W., Washington, DC 20593-0001

INCIDENT SUMMARY 023-98

Sitrep One and Final

20 August, 1998

These reports describe significant environmental incidents reported to and tracked by the National Response Center. They reflect both new incidents and follow-up information describing actions taken for previously reported events. The NRC publishes Incident Summary Reports periodically upon receipt of documentary information from the Federal On-Scene Coordinator.

NRC Case #: 023-98
INSUM #: Sitrep One
Occurence Date: 20 August
Location: Philadelphia, PA
Source: Chemical Mixing Process
Material: Dicyclopentadiene
Severity: Major
Quantity Discharged: 10,000 Pounds
Quantity in Water: None
Body of Water Affected: None
Federal On-Scene Coordinator: MSO Philadelphia

SITUATION: On Thursday, August 20, 1998, process engineers at the Philadelphia Ashland Chemical Plant lost control of a chemical mixing process. Batch temperatures and reaction rate accelerated beyond mixing vessel capacity. The result was a release of gaseous reactants and byproducts. The Ashland Plant was evacuated and portions of I-95 were closed at the Walt Whitman Bridge. The chemicals involved are respiratory and skin irritants, which may also cause kidney damage and affect the central nervous system. The National Response Center received numerous calls from concerned citizens, who observed the cloud of gas leaving the plant. CASE PENDS.