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(b) Earthmoving; Stripping operations may precede gravel extraction by a couple of months but total <br /> disturbed area will not exceed Phase 1 total acreage until bond has been placed for Phase 2 acreage. <br /> Outside contractors will be used for crushing, screening,and stockpiling operations to result in a year's <br /> volume of estimated sand and gravel sales. It is estimated that crushing and screening operations will <br /> take place two to three months per year. The remainder of the year,sand and gravel products will be <br /> loaded off of stockpiles utilizing front end loader directly into customer trucks. In between times of <br /> active crusher operations,overburden will be pushed from the south end of that working phase <br /> northward to result in final grades no greater than 4:1, (H:V)on mined out Osborn land and no greater <br /> than 3:1(H:V)on Wild Burro Investment LLC property. <br /> (c)Water Diversions and impoundments: <br /> No water diversions or impoundments are planned for within the amended acreage area. Drainage will <br /> be maintained to allow for meteoric derived surface flow westward and south to the existing sediment <br /> pond located at the southern end of the original permit area. The existing sediment control structure is <br /> approximately 90 feet in diameter and 14 feet deep,capable of holding(72 hour)up to 1 acre foot of <br /> stormwater prior to potential discharge by way of a weir located at the southwestern reach of the <br /> sediment pond berm to the Eight Mile Creek drainage. However,to date, no storm events have resulted <br /> in sediment pond discharge. Prior to completion of Phase 1 mining,a second sediment control pond of <br /> similar dimensions will be excavated immediately north of the existing structure,doubling holding <br /> capacity for the increased potential storm run-off potential of the additionally disturbed land area. Prior <br /> to completion of Phase 3 mining, a third sediment pond structure of similar dimension and operational <br /> aspect as the first two may be added immediately north of the second pond if necessary to limit storm <br /> discharge rates to equal or less than historic discharge rates. The three sediment control structures will <br /> allow for temporary collection of sediment laden surface run-off with holding time of 72 hours. <br /> (d)Size of Areas to be Worked At One Time <br /> Maximum area to be worked at one time will be as follows starting at amendment approval and <br /> progressing over time dependent on sand and gravel demand: <br /> Phase 1---3 acres including 6.5 acres of Osborn property and 6 acres located in north end of Wild Burro <br /> Investment LLC property adjacent to and immediately south of Osborn mining tract. It is estimated that <br /> Phase 1 area will provide about 400,000 tons of sand and gravel product,enough to support sales for 5- <br /> 6 years. Time frame estimation: 2020-2025. <br />