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Hello.
It is highly likely that after several of the fires, the earth movement of that huge rockslide at Highway 140 back in 2006, a lack of trees or shrubs to stabilize the soil on the hillside, a fissure opened up and released some toxic gases. It need be no larger than a 1-foot-wide x 1-foot-long crack to release gases from an underground fissure. It can go undetected for years as this hiking trail is not heavily traveled, or if winds are blowing and constantly dispersing gases.
But, we locals, are thinking that, with all the family and the dog dead at once - they would have had to have been exposed and died very quickly. And, just because there are few mines in the area does not mean there are no other underground fissures or channels present.
And that’s what we have so far, until further investigation is revealed.
SBM. That is very interesting!! Thanks for sharing.