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SUMMIT ENGINEERING C 0 1 ENGINEERS & LAND SURVEYORS Mail: P.O. Box 1897 Alamosa, CO 81101 P: 719-589-6147 E: summitengco@gmail.com Robins Construction Co. LLLP is applying for a mining permit through the Colorado Division of Reclamation,Mining and Safety,File No.M-2007-080. The mine is to be located in the NW 1/4 SEl/4 Section 15,Township 33 North,Range 8 West of the New Mexico Principal Meridian, Conejos County, Colorado, approximately 4 miles northwest of Antonito,Colorado. Robins Construction Co. has a lease to mine on property with the surface and mineral estates owned by Mr.Aniceto Luceno,P.O.Box 152,Antonito,Colorado. They intend to produce large size basaltic boulders for "J" hooks in an NRCS sponsored reclamation project on the Conejos River and crushed basaltic railroad ballast for the Cubres&Toltec Scenic Railroad. Mining will require blasting of the massive basaltic flows at the mine site to produce the desired products. Because blasting is involved,the Division of Reclamation, Mining and Safety requires an engineering analysis as to the effects blasting will have on the surrounding area. This report is intended to meet that requirement. The manmade structures within 200 feet of the mine site consist of barb wire fencing, irrigation pond and pump, Las Mesitas Ditch, and a farm service road. Las Mesitas Ditch is an earthen ditch and the pond is created by a low level earthen dam on the Las Mesitas Ditch. Although these structures are within 200 feet of the 9.7 acre permit site,none of them is within 200 feet of the proposed 2 1/2 acre active blaming area The dam,a portion of the pond and a portion of the ditch are approximately 250 feet from the active blasting area at their nearest point. The mining faces will retreat from this nearest point resulting in an ever increasing distance from the blasting face. The fmal face will be approximately 700 fat from the nearest structures. The pivot of a radial center pivot sprinkler irrigation system is approximately 750 to 800 feet south of the active blasting area. The fences,fart road,pond and irrigation pump and sprinkler are all owned by Mr.Aniceto Lucero. It is my understanding that the mining lease contains language that will protect Mr.Lucero should damages occur to his property. The nearest permanent residence is a vacant home approximately 0.8 miles to the southeast of the blasting area. The residence is located at 10421 County Road H, Antonito,Colorado,owned by Mr.William Haberkon. Blasting will consist of drilling 3-inch blast boles on an approximate 3-foot by 5- foot pattern with holes approximating 18 feet deep. Initially, nine to ten holes will be shot in any one operation using millisecond delays. This will produce approximately 200 tons of material. As they approach their anticipated 50,000 ton per year production goats, blasting could occur on a daily basis for approximately 250 days per year using their nine-to ten-hole shot operation or on a less firequent basis shooting more holes per shot. Each hole will contain approximately 1 stick of dynamite with approximately 20 pounds of ANFO prill. The nine-to ten-hole shot will utilize approximately l80 to 200 2 Job # 1200710MP - A Page170of78