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TCdrainer
Location: ur moms house Gender: Male Total Likes: 0 likes
| | | Re: Western Entrance Helix - Gas < Reply # 13 on 8/6/2014 4:24 AM > | Reply with Quote
| | | To the OP: What you're describing is normal, assuming we're thinking of the same thing. There's a hole in the wall, which connects to a sanitary-interceptor about 100 meters or so from the outfall. The "gas" which you describe is Methane and possibly Hydrogen Sulfate + a plethora of other by-products that are created when shit decomposes in a confined space, although it smells great, to me. Though I doubt the quantities present at said location are even close to being dangerous or high enough to cause symptoms of acute CH4 intoxication (assuming you aren't standing next to the hole and huffing the stuff). Once you get past that point, it's barely noticeable, especially this time of year when the air-flow blows out of river-level tunnel entrances. However, as someone else mentioned, although sewer-gas and "gas" should be easily distinguishable, if you really are unsure, and are actually experiencing symptoms of Oxygen deprivation, GTFO. It's worth mentioning that I have noticed a tunnel-placebo effect in which NEWB's or otherwise naive people will "feel sick" in areas that I know for a fact are safe.
[last edit 8/6/2014 4:43 AM by TCdrainer - edited 2 times]
| "Reality is an illusion created by a lack of alcohol." |
| Benedicted
Location: MSP Gender: Male Total Likes: 28 likes
| | | Re: Western Entrance Helix - Gas < Reply # 14 on 8/6/2014 3:33 PM > | Reply with Quote
| | | Posted by TCdrainer To the OP: What you're describing is normal, assuming we're thinking of the same thing. There's a hole in the wall, which connects to a sanitary-interceptor about 100 meters or so from the outfall. The "gas" which you describe is Methane and possibly Hydrogen Sulfate + a plethora of other by-products that are created when shit decomposes in a confined space, although it smells great, to me. Though I doubt the quantities present at said location are even close to being dangerous or high enough to cause symptoms of acute CH4 intoxication (assuming you aren't standing next to the hole and huffing the stuff). Once you get past that point, it's barely noticeable, especially this time of year when the air-flow blows out of river-level tunnel entrances. However, as someone else mentioned, although sewer-gas and "gas" should be easily distinguishable, if you really are unsure, and are actually experiencing symptoms of Oxygen deprivation, GTFO. It's worth mentioning that I have noticed a tunnel-placebo effect in which NEWB's or otherwise naive people will "feel sick" in areas that I know for a fact are safe.
| Thanks for the info. It was pretty strong, I've been there 5 or 6 times now and have never smelt anything like it. I definitely felt light-headed, and started seeing black dots. I walked in the entrance about 15 feet to check it out before I left. Are there any other sanitary-interceptors I should know about on that side or near the eastern entrance? Thanks for your insight, I appreciate it.
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| TCdrainer
Location: ur moms house Gender: Male Total Likes: 0 likes
| | | Re: Western Entrance Helix - Gas < Reply # 17 on 8/9/2014 10:14 PM > | Reply with Quote
| | | It was definitely not my intention to infer that smelling gas/feeling not right is not serious, I was simply stating a possible explanation, which is what the OP was asking. I never said smelling gas is normal, what I meant is, if we were in fact talking about the same odor (and judging by his description, I thought we were), that it is not unusual for that particular location. I apologize if my post read as ambiguous, I really suck at communicating via online, non-verbal communication. I feel like I'm a much more effective communicator face-to-face. Anyways, the point I was unsuccessfully attempting to make, is that the sewer-smell which is most prominent near the outfall is normal for that particular drain . It's been like that as long as I've been exploring that tunnel. However, based on your last post, what you're describing sounds like something totally different. If you are light-headed a mere 15 feet into a 9' storm drain, which has great air-flow and air-quality under normal circumstances, something is probably seriously wrong. I really have no clues as to what the origin of the gas which you described would be. There are a few small conduits at the top of the 3rd (final) helix, but I'm pretty sure they were water-mains, not gas-lines, although anything is possible. There are about a billion ways gases could potentially seep/leak into that system, somewhere within the several miles of concrete pipe, not to mention, the source could quite likely be outside the drain completely. As to the existence of other interceptor connections from within, that is the only one I can think of (doesn't mean there aren't others). There are several locations where sanitary connections used to discharge directly into the drain, and ultimately the river. Most of those were walled off when separated sewer from storm (they used to be one system). There could be overflows however, or connections which still exist (wouldn't be the first time). Anytime you feel sick, it's time to GTFO. Again, I no longer think we are describing the same smell/gas. Whatever you are talking about is definitely NOT good. If I happen to be in that area today/tomorrow I'll check out the outfall. Now I'm curious about this. Edit: Missed this the first time I read your post. By the "eastern entrance" were you referring to the other (East) Kittsondale tunnel? If so, they are two separate, sister-drains which drain different parts of St. Paul. And no, that one is one of the most "organic", textbook smelling drains I've ever explored. However, conditions underground are extremely volatile/subject to perpetually changing conditions. For example, many a time I've discovered poor air-quality in tunnels which have always been okay in the past. Each time you explore something, be ready for the unexpected. That's the best advice I can give on this. Remember too, many highly toxic gases have no odor at all, or are undetectable after a couple minutes of exposure.
[last edit 8/10/2014 12:17 PM by TCdrainer - edited 2 times]
| "Reality is an illusion created by a lack of alcohol." |
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