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i • ITEM 4 RESPQJSE: Please refer to the previous discussion regarding the nature of this drainage and the establishment of a setback. This is not a stream and can barely be graced with the term of ephemeral stream. It rarely carries any water. Therefore, having only a 6 foot channel depth should be sufficient to handle most anything but the Biblical flood. Furthermore, in most instances the horizontal setback using an 8 foot vertical setback will be from 30 toto 50 feet. The actual vertical setback height will be determined by how the benches mesh with elevations in the drainage, but it will not be less than 6 feet. ITEI1 5 RE~OPVSE: Thank you for your comments on our 3-D representations. Please keep in mind that these representations are primarily intended for the visual analysis and are not intended to be used for planning purposes. With greater precision in the digitization they might be useful for planning, but we feel there are better ways to do that kind of planning. (note: E1~ID ~ R1PQ~S6 TO JWV DDERFER' S HVDRCLOGY LETTER) SOILS ITEM 1 -_ On page 54, in the second paragraph, please define "shallow" and "deeper" when discussing soil depths in the third paragraph. RESPONSE: By shallow soil is meant soil which is about 6 inches or less to bedrock. Deeper soils are those which are in excess of about 12 to IS inches. Once again, this matter and how it influences plant growth is a continuum. ITEr1 2 -_ 0, page 55, another discrepancy exists concerning salvage soil depth. On page 55, in the last paragraph, you state "using an average of about 8 inches of topsoil and subsoil which could efficiently be salvaged, there is about 10,000 cy of soil over the whole phase." Does the operator commit to providing an 8 inch minimum depth of growth medium, or only 4 inches as previously stated in "Topsoiling under the reclamation plan." RESPQJSE: There seems to be some confusion here regarding terminology. Growth medium refers to and includes everything above the bench. Subsoil is the upper portion of the C horizon in the native soils. Topsoil refers to materials which are derived from or are similar to the A horizon in the native soils. The growth medium to be placed will range from 1 foot to as much as 8 feet near the walls. In salvaging soils, upper subsoil can be salvaged along with the topsoils because the subsoils are little different from quarry rubble. Topsoils to be placed an tap of the backfill will be derived from the combination of topsoil stripped from the native soils and the upper subsoils from the native soils. Because soils are so thin an the south facing slopes and areas where bedrock is very close to the surface of the ground, no soils can effectively be obtained. This acts as a deficit when estimating the volume of soil available for stripping and replacement and that deficit must be subtracted from the mean depth of topsoil and SNYDER NW AI`1ETm1`IIJT ADEQUACY S hK1Y 22, 1989 PAGE 14