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<br />[10333') <br /> <br />" ' <br /> <br />As was done at Meadow Mountain, EDM points were installed at the Dowds <br />No, 1 landslide, The ~OgiC behind their location and constraints related to <br />vegetation disturbance were somewhat different however, In this case we <br />were more concerned about correlation between changes of water levels in <br />monitoring wells during the next spring runoff season and movement at the <br />surface of the landslide that the EDM or inclinometers measurements might <br />indicate. The EDM points at Dowds No.1 are numbered lb to 5b and the <br />initial readings of them were made on June 20th, well past the snowmelt <br />season, and movements from then until monitoring was terminated with the <br />August 9th readings were slight. as expected, In short, and with respect to <br />the immediate perceived need for determination of potential for major <br />landsliding in 1985, the real value of the monitoring system at Dowds No, <br />will be realized only in the spring of 1986 and subsequent years, <br /> <br />If accelerated movement of the Dowds No, 1 landslide. both at depth and <br />on the surface, is coincident with high or near surface water levels in the <br />water-level-monitoring holes, as I fully expect it will be, then a dewatering <br />system should be considered, I doubt that it would prove to be feasible to <br />intercept or control percolation of snowmelt water into the upper part of the <br />landslide because of terrain conditions. but a French drain or pumped system <br />might prove to be feasible in the lower part, especially in view of the <br />current actual and potential costs of maintenance and repair of the highway <br />and bridge structure. <br /> <br />i , <br />\ <br /> <br />... <br /> <br />2 <br /> <br />EDM points must be located such that they are in line-of-sight view of <br />another permanent monument where a measuring instrument (electronic <br />theodolite) is set up. Consequently vegetation (trees) cannot be in the <br />way, <br /> <br />, <br />, <br /> <br />- 10 - <br />