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Haley&Aldrich, dated November 6, 2001. <br />Z. Geotechnica] Engineering Services, Proposed MMRR Quarry, Gilpin County, <br />Colorado, Lyman Henn, Inc. dated August 19, 2005. <br />3. 3rd Adequacy Review Comments - MMRR Quarry, Regulaz 112 Application <br />C1ass:Permit File No. M-2004-067, State of Colorado, Division of Mineral and <br />Geology, dated September 12, 2005. <br />4. Sheet GC-2, Civil Standard Details II, Sanitary Interceptor Along SH-119. <br />From the geotechnical engineering investigation, the subsurface conditions consisted of <br />20.5 feet to 26 feet of coazse alluvium overlying bedrock. The alluvium consists of cobble and <br />boulders up to several feet in diameter with sand and gravel. The sand and gravel ranges from <br />poorly graded to well graded. <br />From the geotechnical engineering services, the estimated particle velocities from the <br />proposed quarry development and production operations were calculated for various structures <br />in the vicinity of the proposed quarry. Particle velocities ranging from 0.0497 to 0.5371 inches <br />per second for production blasting, 0.0339 to 3.5152 inches per second for product processing <br />azea and .0124 to 1.14167 for the access road were determined. <br />VIBRATION ANALYSES <br />Vibration analyses were conducted using the data provided in review material item no.2 <br />and the site plan of the wastewater treatment facility developed from the site visit. The <br />estimated particle velocities at each of the structures induced by the three types of blasts <br />(quarry, production and access road) were detemuned using the following equation: <br />3 <br />