Open letter to: PREMIER HORGAN, cc. HONOURABLE Eby, HONOURABLE Ralston, HONOURABLE James
Gramineae Seed Farm
Arthur & Laurel Hadland
6750 253 Road, Baldonnel, B.C. V0C 1C2
Phone: (250) 789-3566
Re: SITE C IS SINKING INTO OLD MUD
Objective information regarding the geological instability of Site C has been available to decision makers for a long time.
Firstly, the 1963 Professional Engineers’ Analysis of the 1957 collapse of the Peace River Bridge identified the Shaftesbury Shales and high rainfall as the prime reason for that failure.
Secondly, an excerpt from Klohn Crippen & SNC Lavelin Peace River - Site C Hydro Project Reservoir Shoreline Impacts Methodology and Criteria Report No. P05032A02-10-001; September 2009, Page 9:
"The uncertainties in predicting both the extent and rate of the reservoir
shoreline impacts lead to the proposal to adopt an observational approach
for periodically reviewing and updating the reservoir impact lines after the
reservoir has been filled."
This statement should have been a show stopper!
This was followed by a LIDAR report showing 4010 active slide areas in the proposed reservoir.
Thirdly, a 1991 Report for the former Minister of Energy and Mines Jack Weisgerber:
(Quaternary Geology and Landforms of Eastern Peace River Region, British Columbia, by N.R. Catto 1991). This report was made without reference to the proposed flooding of the Lower Peace River Valley; rather it was commissioned to examine aggregate exploitation within the lower Peace River region. This report is brought to the attention of the reader regarding reservoir safety concerns. These concerns are highlighted in this 1991 report by the following excerpted observations:
"Mass movements, including rotational and translation glacial slides and a variety of sediment gravity flows, commonly occur along all the major streams.”…..Page 2
“The high concentrations of montmorillonite and bentonite in the strata, however, together with their poorly consolidated nature, greatly increases susceptibility of these rocks to slope failure following fluvial (or arthropogenic) undercutting or overloading.”…..Page 2
"The clays are generally plastic, susceptible to sediment gravity flow if disturbed, and contain a high proportion of material derived from the local Cretaceous bedrock.”…..Page 5
“Mass movements in the region can be induced by the fluvial undercutting, natural overloading of the slopes (e.g. by debris flow from above), loss of internal cohesion due to sudden saturation (as was common during June, 1990), or by human activity. Evidence of past colluviation in the region is extensive (Bobrowsky et al. 1991), and extreme caution is required in any effort to exploit or utilize river valley slopes.”….Page 10
“Thus, all of the major terrain slopes present in the eastern Peace River Region are subject to slope failure. Extreme caution should therefore be observed in any effort to exploit or utilize river valley slopes.”…..Page 15