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l <br /> <br />• Ra++-~1m and replacenent of the wearirg course at regular <br />inter~rals <br />Prompt repair of "pot holes" and "washboard" portions of the <br />pavement <br />...The design pavement section is based upon a 3 year life; " <br />Based on field reconnaissance activities in 1981, the road appeared to <br />have been constructed uslrg Robert W. Thompson recortm~erdations, however, <br />we do not have "as-built" construction quality control notes to docim~ent <br />"as-built" road specifications. CMLRD has the "as-built" alignment, <br />geological engineering maps and drainage control documentation. (See <br />Access Road-Drainage Features with Respect to Plan and Function section) <br />Access Read <br />- Drainage Features with Respec.-t to P]an and Punctirn <br />In 1980, CMLRD requested Sun Coal Company to develop an access road <br />drainage control plan. The drainage control plan (July, 1981) was <br />developed to control surface water runoff fran the disturbed area occupied <br />by the haul road, ensuring the peak flaw from the 10 year-24 hour storm to <br />be conveyed from the road corridor without causing adverse off-site <br />impacts. The plan was developed under the direction of a certified <br />• professional engineer (ERTHC-David Krebs) and implemented as approved by <br />the CMLRD. The water control plan specified the construction of sediment <br />traps, road ditches and the installation of culverts. In addition, a <br />sedimentation pond to treat the runoff from the 10 year storm was <br />constructed. <br />After the water control structures were installed, (1981) Sun Coal Company <br />implemented a ditch, culvert and sediment trap maintenance program. The <br />program cor~isted of routinely monitoring all structures ard, if neces- <br />sary, cleaning and/or repairing structures. Prior to developing an <br />erosion control plan, a field reconnaissance was conducted to determine if <br />the study area had soils prone to erosion. The results of the study <br />determined many of the soils within area to be susceptible to erosion, as <br />evidenced by the soil piping in Stone House and Coal View Gulches. In <br />light of this reconnaissance evalutio~n, road drainage design considered <br />and incorporated measures to: <br />- minimize off~ite erosion and sedimentation; <br />- minimize the collection aryl concentration of water in areas prone <br />to erosion; <br />- minimize tl)e collection, concentration and discharge of surface <br />water from one drainage area into another; <br />- locate culverts where stream channels crossed the access read; <br />. - locate sediment structures to reduce runoff flow velocities. <br />- 212 - (Rev. 5/86) <br />