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�pv ncPr&r lceviyc yv 1114-Y yu `" 1'gv6,14La r- kr.�ti&e. spec s <br /> li QrI/KO tjf <br /> GRAdrt,.t- C 3:/� A , V 5/ oe- s'/o/r�S C 1"°/' r"'drg A-=9° !r <br /> 12trTLt /bvTTrM a.r pTt. o� silo S/�/�es> <br /> To— /2r/ AZ+f .r4 r7•_3 01 b-µ•CO <br /> Task 4 7;-A� R-y nor-/ lfa-c PI"v—1 <br /> Drainage Repair and Construction: <br /> A large gully has formed on the lower end of the steep riprap channel where the drainage <br /> transitions between rock and an earth lined channel. Approximately 250 feet of rip rap channel <br /> will need to be constructed or repaired as indicated on Drawing 1. <br /> A.a lt.M,a e'-- A,& s r e e of a. M4w--- 8 :t/ h-tw-0"' Ax i A.P <br /> , eight(8)foot wide, eight(8)foot high drainage channel will be constructed <br /> from the end of the existing rip rap channel to the bottom portion of the slope as located in the <br /> field. The bottom of the drainage channel will be lined with a minimum 30"depth of riprap. <br /> Using on site materials, the riprap available on site will consist of a combination of 20% minimum <br /> 4'diameter rock, 40% minimum 2'to 3'diameter rock and 40% 12"to 18" rock. The 4' diameter <br /> rock will be keyed into the bottom of the constructed 3H:1V channel through excavation <br /> placement to not extend above ground more than 30" high and placed Every 20' in slope length. <br /> The 12"to 18" rock will be placed and compacted into the bottom of the excavated channel. The <br /> 2'to 3' diameter rock will then be placed over the smaller rock to fulfill the 30" minimum riprap <br /> depth requirement. Placement will be such that voids will be eliminated to the best extent <br /> possible with rock contacting rock. Side slopes to the constructed channel will be at a maximum <br /> 31-1:1 V slope. Side slope riprap will extend up the sides of the constructed channel to a minimum <br /> 4' height. <br /> Material excavated as a result of drainage course construction may be excavated and hauled to <br /> or graded against the excavated bench cuts as noted on the drawing. (Prior to depositing or <br /> grading excavated material against the excavated bench cuts, existing vegetation and soils to a <br /> 24"depth will be graded o d st �ed. tockpiled vegetation and soils will be evenly <br /> redistributed over the osited ateriadrainage course construction upon completion of <br /> earthmoving procedures. <br /> If any trash is encountered during excavation for channel construction, trash will be hauled off to <br /> the nearest County approved landfill site. <br /> Measurement and Payment <br /> There will be no measurement for payment of Task 4, Drainage Repair and Construction. <br /> Payment for this Task will be reflected in a lump sum bid under Item 4 on the Bid Schedule. <br /> This lump sum bid will cover all costs for excavating, hauling, placing and placing the riprap <br /> material as described in these specifications. t $1 A.e e -A,s 15 ro << -,R 14 1*' <br /> L4C~ <br /> n, F, n �,s r4 <br /> Tasks r-ooT <br /> ( •d r� <br /> Portal Repair and Rock Apron <br /> hA-iKrr" r le <br /> The mine octal area backfill extends up against thtr sandstone outcrop. Water upgradi f <br /> the portal is flowing into an existing channel and creating an opening between the and <br /> fill material.The opening will be fop excavated to determine the extent and depth of the hole. <br /> T-he-peftRa"e-filled;compact 18"to 24"of rocN <br /> the hole may be filled with on site materia r a Polyurethane Foam Plug (PUF) in accordance <br /> with Specification 9 of the General Bid Specifications, Colorado Inactive Mine Reclamation <br /> Program, 2006. The PUF must be covered with minimum 3 feet cover using onsite fill material. <br /> Use of PUF is not guaranteed. <br /> -9- <br />