|Summary Date: June 2005||View detailed information from database on this site.|
|Status: Active||Database Name: Delta Western Wrangell|
|Location: 1417 Peninsula Street, Wrangell, AK||
Latitude/ Longitude: See database entry
| DEC Contaminated Sites Contact: Bill Janes, Project Manager - 907-465-5208
The Delta Western/former Chevron Bulk Plant is an operating Delta Western Terminal. Originally developed as a fuel storage facility in the late 1930's, it has operated in that capacity to the present. The site is located on Point Shekesti approximately 35-40 feet above sea level. It is located adjacent to Zimovia Strait and Wrangell Harbor.
The fuel farm's facilities have not changed significantly since its original construction. These include eight above-ground storage tanks with various kinds of gasoline, jet fuel and diesel fuel.
The site was added to the contaminated sites database in 1999 due to petroleum contamination from the fuel farm that migrated to adjacent residential properties. Both soil and shallow groundwater were impacted. Groundwater is not used for drinking water purposes in the area but has carried contaminants to nearby surface waters.
Site characterization occurred over three years. Investigations included soil testing and several rounds of groundwater monitoring at nine monitoring wells located both downgradient and lateral to the facility. Wells were placed according to likely flow pathways identified during a comprehensive sub-surface topographic investigation.
View from Peninsula Street toward the two fuel tank farms on
the hillside. Delta Western facility is to the left on the hill,
and Wrangell Oil is on the right.
Chevron's consultant determined that contamination from an adjacent tank farm, Wrangell Oil (a former Unocal facility), may have co-mingled with contamination from the Delta Western facility. The steepness of the slope and limited access to the area directly behind the Delta Western tank farm are significant obstacles to addressing this contamination. Groundwater monitoring confirmed the contaminant plume had migrated off-site and was reaching the Zimovia Strait shoreline. Approximately 200 cubic yards of soil were removed from the facility and the adjacent properties in 2003 and 2004.
Public Health and Environmental Concerns
Testing in 1999 determined that there are gasoline, diesel and heavy oil contamination in the soil and groundwater. People could be exposed to this by direct contact or breathing vapors. Petroleum chemicals have reached marine waters where they may impact marine organisms.
Independent of the cleanup project led by Chevron, Delta Western completed the installation of a spray-on secondary containment liner in 2004. Groundwater monitoring since that time has shown steadily decreasing concentrations in most wells. It does not appear now that contamination is reaching the marine environment, however further investigation is planned. In May 2005, DEC's project manager directed the placement of two more monitoring wells adjacent to Peninsula Street to determine if known residual contamination beneath the tanks may be impacting groundwater along the east side of the facility.
For more information and updates on this site, please see the database entry--link at top of page.
Site characterization workplan, 2003 (PDF 2.9M)
View northeast, with Wrangell Oil on the hillside to the left and Delta Western to the right.
The orange pipe sticking up on the left side of the photo points to a monitoring well.
The arrow indicates the groundwater flow direction from the hillside to Zimovia Strait,
approximately 150 feet to the south.