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• <br />unusually wet and very favorable, extensive top growth and limited reproduction can occur. <br />But, it requires very unusual conditions for this to occur. Therefore, except up close, not much <br />~ evidence of success should be visible from a distance until at least the second growing season. <br />~• - Some shifting (mainly reduction) in the native invaders can be expected within the first <br />five years. Very non-competitive native species may be crowded out, but after five years <br />species diversity should not be reduced by more than 10% to 20%. The rate of change is <br />largely dependent upon growth conditions during each growing season. In yeazs of dryness the <br />native species should increase, but in wet years they may show some decrease. <br />After five years, total cover should exceed 40%, but should not be over about 75% on <br />east facing slopes or 85% on north facing slopes. After 10 years cover on both slopes should <br />increase to about 85% to 90% with shrubs contributing about 50% of that amount. <br />Lower Zone Rehabilitation <br />Rehabilitation of the Lower Zone will require some earthwork. The amount has been <br />kept to a minimum to reduce cost and to help prevent the Division of Minerals and Geology <br />from deciding this is really an amendment. Most of the earthwork involves grading, <br />backfilling a few erosion areas and minor highwalls, combined with ripping or scarification to <br />allow for better growth in the revegetation. The discussion will follow the labeled areas on <br />Map R-3. <br />Area 1: This is a small area where a small highwall exists. This could be backfilled <br />and the highwall either eliminated or reduced in height. The work in this area is not essential, <br />but would give this portion of the quarry a more finished appearance. There does not appear to <br />be much material available for backfilling near the highwall. It is not recommended that <br />material be taken from other areas to do this backfilling or material be brought in from outside <br />the site. [ do not think it is important or significant enough to warrant that kind of action. <br />Basically, do what can be done to reduce the highwall height. <br />Area 2.• This is a small area where water has flowed over the roadway and eroded the <br />slope. A small pipe sticks out of the hillside. Water drainage above the eroded area should be <br />diverted so it does not flow over this location. Backfilling can be done using fine material <br />available in the quarry or it can be filled with large rock to provide a kind of drainage course. <br />If fine material is used, the Base Seed Mixture should be applied. If large rock is used then no <br />seeding is necessary. <br />Deer Creek Quarry Rehabilitation June 1994 Page 9 <br />