Parachute Creek spill: Day 128

The area of the underground hydrocarbon plume is outlined in yellow. This map is dated April 30, 2013

The area of the underground hydrocarbon plume is outlined in yellow. This map is dated April 30, 2013

Benzene levels at Sampling Site 6 nearly doubled between July 1 and July 8

Williams testing results

Parachute Creek Update for July 12, 2013

Creek and ground water samples continue to be recorded regularly. All creek surface water sample points have remained non-detect for benzene contamination with the exception of CS-6.

CS-6 Reading (parts per billion–“ppb”)
Monday, July 1

Friday, July 5

Monday, July 8

The cause of the elevated contamination at CS-6 is an interaction between ground water and creek surface water in that specific area. Multiple actions are being taken to eliminate this low-level contamination, including the expansion of the nearby air sparge/vapor extraction system and installation of an identical system farther upstream of this sample point. These new air sparge wells and associated vapor extraction points will be activated the week of July 22. A work plan for the construction of a third ground water treatment system currently is being reviewed by the Department, EPA and OGCC.

It is important to note that contamination found at CS-6 is isolated and does not appear to be traveling. All other sample points remain non-detect for contamination, including the Town of Parachute’s diversion point. The existing air sparge system continues to work very well.

There is an overall decrease in daily hydrocarbon recovery numbers from ground water wells, as the wells have been successful so far in removing floating hydrocarbons from ground water. This also means less liquid hydrocarbon is on the move in ground water – much of the remaining contamination having settled into pockets in the soil to become stagnant. The removal of that contaminated soil will be the subject of additional remedial actions.

Currently, approximately 130 tons/day of contaminated soil, generated during the initial response action immediately following discovery of the release, is being shipped to a treatment site in East Carbon, Utah. The goal is to have all of the stockpiled soil removed from the site by the end of July.
[end of update]

CDPHE Parachute Creek


Benzene levels increase near oil and gas spill by Parachute Creek

Benzene levels at a point in Parachute Creek near the Williams Co. gas plant spill doubled in a week to 3.9 parts per billion Monday, just short of the 5 ppb considered safe for drinking water.

The Colorado Department of Public Health and Environment said new sparging systems at the sample point and upstream are being installed to stop contaminated groundwater from reaching the creek north of Parachute. The new systems will be turned on the week of July 22 …


Most tests at Parachute Creek spill site find no carcinogenic benzene

All but one of the latest tests of Parachute Creek in western Colorado, near where an estimated 241 barrels of natural gas liquids spilled after a valve malfunctioned, detected no carcinogenic benzene, according to an update from the Colorado Department of Public Health and Environment …

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