2016-07-28_PERMIT FILE - M2016010 (2)

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WORWEST 95O SOUTH CHERRY STREET, SUITE 800 DENVER,CO 80246 COR PORAT ION TEL: (303)782-0164 FAx: (303)782-2560 MEMORANDUM To: Colorado Department of Reclamation,Mining,and Safety Ref# 591-4 CC: Jerald Schnabel,Transit Mix Date: July 28,2016 From: Paul Kos Subject: Engineering evaluation of Little Turkey Creek Road Introduction Little Turkey Creek Road is an existing structure located within 200 feet of the proposed Hitch Rack Ranch Quarry permit boundary. Little Turkey Creek Road is adjacent to Little Turkey Creek in the quarry area. The road adjacent to Deadman Creek is also named Little Turkey Creek Road. The locations of the roads are shown on Figure 1 of the permit application. The road within the permit boundary is owned by the Hitch Rack Ranch landowner,but several people have easements to travel the road to their property either west or north of the proposed quarry area. This engineering evaluation covers both road segments and discusses the structure location,condition,and components before evaluating potential impacts quarry development could have on the structure and presenting how the quarry has been designed to minimize these impacts. Structure Description Both segments of Little Turkey Creek Road within 200 feet of the proposed Hitch Rack Ranch Quarry permit boundary are gravel/dirt roads that follow the adjacent creek at approximately the same gradient as the creek. The road surface contains a variety of materials including areas of bedrock and dirt; gravel is common near the culvert crossings. The road is not crowned. Both segments are single-lane roads that require high clearance to travel. Four-wheel drive is not required in dry conditions,but comments received from landowners suggest that four-wheel drive is likely required, or the road is impassable, during wet conditions, snow, or high water levels in the creek. The comments also discuss the need for extra or continued maintenance on the road. The road segments do not have a constructed ditch system. Portions of the road along Deadman Creek have the Deadman Creek drainage immediately adjacent to the roadway. A photograph showing the typical road condition is included in Figure 2. The segment along Little Turkey Creek that lies within two hundred feet of the proposed quarry contains three sets of culverts, and the segment along Deadman Creek contains one culvert. There are additional culverts along both road segments that are outside the study area. At each Little Turkey Creek location, there are two reinforced concrete pipe culverts, and each pipe is 30 inches in diameter. The Little Turkey Creek culverts were installed with insufficient slope or below the grade of the thalweg of the stream so that water ponds at the inlet and outlet even during low-flow periods. The culverts and associated fill cause the road to rise approximately two feet at each crossing location. The Deadman Creek culvert is a plastic pipe DENVER/CALGARY/VANCOUVER/SALT LAKE CITY/GRAND JUNCTION/CHARLESTON WV/NEWCASTLE WWW.NORWESTCORP.COM