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FEB-02-99 10 :32 AM ESCO_ASSOCIATES 303 499 4276 P. 06 <br /> that are applied on rough surfaces almost inevitably have patches of fabric <br /> around surface high points that are off the ground. During high wind <br /> conditions, the lift on the material can be substantial and the fabric can be <br /> blown off. Because it conforms so much more closely to irregular surfaces <br /> than fabric products, bonded fiber matrix can protect and nurture the <br /> germination and establishment of seeded vegetation better on many types of <br /> extreme sites. It is however, expensive, ranging in my experience from $5,000 <br /> to $7,000 or more per acre. It also is best applied where the subject area can <br /> be approached from two angles, at least one of which is approximately 45 to <br /> 90 degrees. At very low angles, and especially when applied from above, as on <br /> a very steep slope below a road, it is very difficult to get the bonded fiber <br /> matrix slurry to cover evenly. Rather, it tends to "roll' downslope and leave <br /> spaces uncovered. For situations like Coal Basin where the slopes are very <br /> steep and the approach is mostly from above only, it is very difficult to apply <br /> bonded finer matrix or any other slurry such as normal hydromulch from an <br /> advantageous angle. According to my reading of the 1998 bid specifications, <br /> bonded fiber matrix was not included, which may reflect experience of the <br /> above description gathered during 1997 work. Although steep slopes with <br /> access from above pose some substantial restrictions on the effectiveness of <br /> bonded fiber matrix, the potential advantages of the material on rough and <br /> Inaccessible slopes made its trial in 1997 a reasonable undertaking, in my <br /> opinion. <br /> GLA Comment No. 5 <br /> Response: it would appear that trees were included in the estimate sheet for <br /> reclamation costs associated with the permit. <br /> 6 <br />