2020-03-06_REVISION - M1978283 - Laserfiche WebLink

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MINING PLAN (CONT) EXHIBIT D September 2019 along the western highwall left when the parking area was built . If material is mined in this area it is likely the highwall will be removed by mining. Then the redisturbed portion will be reclaimed leaving the parking area and sloping the exterior slopes to 3h to lv. The Existing Conditions Map - Map Exhibit C shows how the current permit area will look after this amendment . The areas being added are shown in yellow. The green outline is the new permit area, the red line is the existing permit area and the orange outlined hatched area is the 111 permit area . MINING PLAN The following information was reproduced from the 2002 application packet and updated with information as appropriate for the new area being added. This will retain the continuity of the permit as only minor areas changes are being made . (a) Mining commenced in this operation over 79 years ago . It was described by a DMG inspector as a "sand harvesting opera- tion" which removes sand from the arroyo floor which is later replaced by the runoff in the stream bed. This is an ephemeral stream with extremely limited runoff . The life of the operation appears to be something long term with the life difficult to project since it is self regenerating. (b) The plant growth medium is limited to 12-18" . This minimum amount will be salvaged and stockpiled on the north and south affected area or above the creek channel . This may be used to backslope the walls of the arroyo in final reclamation. How- ever, this will be somewhat of a futile exercise since the stream flow will wash it out and leave the vertical arroyo banks like those both upstream and downstream from the pit site . For the upland areas that are mined, there is approxi- mately 6 inches of growth medium that can be salvaged. (c) There is no overburden or waste rock to be removed from the deposit . Therefore, there will be no stockpiles of overburden or waste rock shown on Exhibit C-1 - Mining Plan Map. (d) In the channel, the sand will be mined to a depth 0-151 . The sand is of much greater depth, but this mining plan is designed not to expose any underground water, which limits the 8 (REVISED 3/6/2020)