Previous leaks suspected in Parachute hydrocarbon probe

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As Carl McWilliams points out in a recent email, the COGCC reported the benzene concentration as 18,000 ppb and this is 18 ppm. Concerned about worker safety, he goes on to ask the question, “I may sound paranoid or just skeptical; but ask yourself this question: Why did the COGCC report the benzene levels in the billions (ppb) instead of the millions (ppm)? “ He lists the link http://www.cdc.gov/niosh/idlh/71432.html and adds a listing of abbreviations used:
NOTE: IDLH = “Immediate danger to life and health”. PEL = “Permissible Exposure Limits”, TWA = “Time Weighted Average” and STEL = “Short Term Exposure Limit”. He also adds the NIOSH note:
Revised IDLH: 500 ppm
Basis for revised IDLH: The revised IDLH for benzene is 500 ppm based on acute inhalation
[Note: NIOSH recommends as part of its carcinogen policy that the “most protective” respirators be worn for benzene at concentrations above 0.1 ppm.
toxicity data in humans [Gerarde 1960].

But this story indicates that Williams is throwing in the towel as to locating a source saying it may be past spillage or whatever. I would offer them a suggestion:
If the valve on the liquids line is not leaking now, maybe it was in the cold weather. The valve, by the picture I viewed is mounted on an above ground riser. If this line proceeds straight from this offset, the cold temperatures can contract the line and put stress on the valve flanges. This could cause a weather induced drip that “cures” itself when temperatures become warmer. The offset works as an expansion joint and temperature ranges cause flex movement. Just saying—-



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