North Central Petroleum Spill

In December 1994, a tanker truck operated by North Central Petroleum (NCP) overturned on Highway 17 approximately 17 miles east Bridgeport, Washington.  The Site and surrounding areas are primarily used for grazing of livestock and contain no aboveground structures or other man-made features.

Approximately 6,250 gallons of leaded and 900 gallons of unleaded gasoline were spilled. Spilled gasoline entered the soils and groundwater on the north and south sides of the highway.  A quantity of gasoline was pumped from a pit which the contractor had dug in the ground.

Approximately 7700 cubic yards of soil were excavated and stockpiled near the Site.  Of eight samples taken from the stockpile in August 1996, all but one was non-detectable for total petroleum hydrocarbons-gasoline (TPH-G) range; one sample had a TPH-G concentration above the Model Toxics Control Act (MTCA) Method A soil cleanup level.

In March 1995, four groundwater monitoring wells were installed, and samples were collected and analyzed for TPH-G and BTEX (benzene, toluene, ethylbenzene, xylene).  No analysis was done for lead in soil or groundwater.

Annual groundwater sampling is being conducted.  The values for all parameters showed steady declines each year.

This site is in our Voluntary Cleanup Program, which provides technical help to owners of contaminated sites.

Voluntary Cleanup Program customers pay fees to cover our costs for technical help and reviewing cleanup reports. Sites in this program must meet the same cleanup standards as sites Ecology manages under legal orders.