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MINING PLAN (CONT) EXHIBIT D <br /> September 2019 <br /> along the western highwall left when the parking area was built . <br /> If material is mined in this area it is likely the highwall will <br /> be removed by mining . Then the redisturbed portion will be <br /> reclaimed leaving the parking area and sloping the exterior <br /> slopes to 3h to lv. <br /> The Existing Conditions Map -Map Exhibit C shows how the current <br /> permit area will look after this amendment . The areas being <br /> added are shown in yellow. The green outline is the new permit <br /> area, the red line is the existing permit area and the orange <br /> outlined hatched area is the 111 permit area . <br /> MINING PLAN <br /> The following information was reproduced from the 2002 <br /> application packet and updated with information as appropriate <br /> for the new area being added. This will retain the continuity of <br /> the permit as only minor areas changes are being made . <br /> (a) Mining commenced in this operation over 79 years ago . It <br /> was described by a DMG inspector as a "sand harvesting opera- <br /> tion" which removes sand from the arroyo floor which is later <br /> replaced by the runoff in the stream bed. This is an ephemeral <br /> stream with extremely limited runoff . The life of the operation <br /> appears to be something long term with the life difficult to <br /> project since it is self regenerating. <br /> (b) The plant growth medium is limited to 12-18" . This minimum <br /> amount will be salvaged and stockpiled on the north and south <br /> affected area or above the creek channel . This may be used to <br /> backslope the walls of the arroyo in final reclamation. How- <br /> ever, this will be somewhat of a futile exercise since the <br /> stream flow will wash it out and leave the vertical arroyo <br /> banks like those both upstream and downstream from the pit <br /> site . For the upland areas that are mined, there is approxi- <br /> mately 6 inches of growth medium that can be salvaged. <br /> (c) There is no overburden or waste rock to be removed from the <br /> deposit . Therefore, there will be no stockpiles of overburden <br /> or waste rock shown on Exhibit C-1 - Mining Plan Map. <br /> (d) In the channel , the sand will be mined to a depth 0-15 ' . <br /> The sand is of much greater depth, but this mining plan is <br /> designed not to expose any underground water, which limits the <br /> 8 <br />