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January 6th, 2005: Danger below Tolmie Clay Slide

From David Lamson, Chilliwack River Action Committee:

I have just visited the Tolmie Clay Slide this morning and report:

HIGH SLUMP POTENTIAL AT DOWNSTREAM END OF TOLMIE CLAY SLIDE

In the last two weeks large cracks have developed along the escarpment above the downstream end of the Tolmie Clay Slide, above the unprotected area. This is the area not yet protected by groynes and much undercutting erosion has taken place leaving the banks very steep. The largest crack is approximately 30 cm. wide and 10 meters long, with a potential slump area with cracks 10 m wide, 70 m long and wedging downward for about 50 m. High potential for a major slump which would cross the river, probably temporarily blocking it's present course. When the frost comes out and if there is rain and/or any earthquake there will be a higher potential.

DANGER FOR FISHERMEN AND RIVER USERS

If such a slump occurs and anyone was below on the river or fishing from the bank, or a river raft or kayaker on the river they would be in extreme danger. Residential area of Slesse Park could be impacted, depending on the size of slump.

The cracks are above the area which is not yet protected because of limited funding last summer.

The Chilliwack River Action Committee's groynes built in the summer of 2004 along the upstream 350 meters of slide area are working well and have prevented the slide toe in this section from undercutting erosion. There appear to be no cracks in this area. Funding came from local donations, FVRD, PSF and HCTF, but, unfortunately, there was not sufficient funding to complete the job. Several other funding applications and a plea for more funding went unheeded.

Our river engineer, Peter Morgan, from Golder Associates has been informed of the situation. I have also informed Gale McMahon, Emergency Management Coordinator, FVRD.

I suggest at a minimum, the river below the slide area be immediately posted EXTREME DANGER.

Who has the funding and responsibility for this and is willing to take action?

David Lamson
Electoral Area Emergency Coordinator and President
Chilliwack River Action Committee

   
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