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<br />Comment 17. Please indicate what permits, licenses, or approvals may be needed prior to <br />installation of the overhead conveyor crossing Brighton Road. <br />• The conveyor will require approval from, and a surety bond for, Commerce City. <br />Approval from the city will be in the form of a letter agreement similar to a traditional <br />building permit. The process necessary to obtain the approval has been initiated. <br />Comment 18. In the absence of a commitment to maintain a minimum setback distance of 64 <br />feet from all permanent man-made structures within 200 feet of the proposed affected land, <br />please address how compliance with Rule 6.4.19 will be achieved for all such structures. <br />• See Response to Comment 3. <br />Comment 19. It appears that several irrigation laterals may be removed during mining. Provide <br />a notarized statement from the owner of these structures that they are not opposed to their <br />removal during mining and that there are no easements, contracts, or cooperative agreements <br />regarding this irrigation system that will be adversely affected by the removal of any such <br />irrigation structures within the affected land. <br />• The irrigation laterals affected are all within the property boundary and are owned by the <br />applicant. <br />Response to Comments Received from Mr. Tom Schreiner, April 7, 2000 <br />Comment 19. There appears to be a potential for existing or future contamination of soils and/or <br />ground water within the proposed affected area. Provide an alluvial aquifer characterization <br />including ground water elevation, direction and gradient of flow, transmissivity, and hydraulic <br />conductivity. <br />• Average depth to water = 22 feet. <br />• Average depth to bedrock (first aquitard) = 31 feet. <br />• Alluvial aquifer saturated zone = 9 feet. <br />• Ground water flow =north-northwest with a linear velocity of 6.7 ft/day. <br />• Hydraulic conductivity (permeability) = 334 ft/day. <br />• Transmissivity = 3,000 ftZ/day. <br />• Hydraulic gradient = 0.006 ft/ft. <br />• Estimated dewatering rate = 630 gallons per minute. <br />• Estimated maximum distance for cone of depression influence = 750 feet from edge of <br />pit. <br />• Most alluvial wells within 600 feet of the proposed Tanabe site are no longer used for <br />domestic purposes. As discussed in the Phase I Assessment Addendum Report included <br />in Attachment I, most domestic well use near the site has been replaced by alternative <br />water sources. However, on January 19, 2000, two registered wells were identified <br />within 600 feet of the site by the district water commissioner (Bob Stahl). A map <br />illustrating the two wells is provided in Attachment J. The well yields listed with the <br />SEO are illustrated on the map. No water quality data were available. <br />Page 6 <br />