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• ge 3 June 18, 1985 Sand Pit C. Farrell J Item b - It appears that there is a misunderstanding regarding the relocation of the ditch next to the Columbine Industial land. The ditch will not be relocated in that area. IC will remain in its current location. However, it will be concrete lined in that area. Item 3: Please provide the agreement between Castle Concrete Comapny and the Colorado Division of Highways concerning the proposed "boring" 24 feet beneath Academy Boulevard. RESPONSE: The approval from the Colorado Division of Highways to .~ bore under Academy Boulevard is still in the process of negotiation and issuance. We will agree to having the approval of this amendment contingent upon the issuance of this approval to bore under Academy. Item 4: You stated the access road relocation further south of its present location will be accomplished by backfilling the north bank below the roadway. It seems backfilling the south slope of the roadway would facilitate the road relocation further south. Please clarify. RESPONSE: It appears to us but using different terminology. By meant the north slope of the sand pit south slope of the existing roadway. page 2 of Exhibit D in their entirity is meant. that we are saying the same thing, 'north bank below the roadway" is which is the same thing as the If you read paragraphs 2 and 3 on we think you will understand what Item 5: What is the proposed final depth of excavation? The original plan and Technical Revision #2 totaled an excavation depth of 95' of sand + 15' of gravel (110 feet). RESPONSE: Some attempts were made to excavate the gravel layer under the sand, but at this point it does not appear to be actually feasible due to a fluctuating water table in this area. Therefore, the current depth is the final depth. Looked at another way, The existing topographic line on the cross-sections shows both the existing and the final depths at various locations. 11 Actually, no specific depth figure can be given as it really Jdepends upon where one measures it. In some places, the excavation is only about 65 feet deep while in others it is closer to 90 or 95 feet. To us, the actual depth of excavation is of little importance as the depth of possible mining is controlled by the water table. If excavation goes too deep the pit bottom becomes "mushy" and equipment tends to get stuck. Therefore, we always try to stay several feet above the water table.