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these specifications. ,� P° <br /> ON S <br /> or Nis ✓�' �� <br /> Task 3 f t/r`i9L P 01S'` It. f S <br /> Rock Check Dam Construction: jr"l n e$VX0 <br /> Rock Check Dams are required in three areas; along the access road, on the portal bench and <br /> the outslope of the fill. See drawing for locations. Rock check dams shall be installed as <br /> follows: <br /> • Access Road-Small erosion features extend down the slope approximately 200 feet. <br /> tK fxSor Install a rock check dam every 20 feet as directed by the Project Manager. Rock check <br /> darns shall consist of 18"to 24"of rock using on site material Rock check dam ty w��s✓ ,,.•� <br /> h Oe- vs. dimensions will be 3' long by 3'wide by 2'deep and be keyeA to a depth of 2 <br /> T-W o p acement will be such that voids will be eliminated to the best extent possible with rock <br /> contacting rock and smaller rock used to fill any voids. <br /> Portal Bench-One large erosion feature extends down the graded portal slope F•ti �� '� v�- <br /> approximately 50 feet k:i-length. Rock check dams will be installed every 10 feet as <br /> directed by the project manager. Rock check dam rip rap, available on-site will consist of - <br /> an evenly distri6-uted combination of 60% minimum 4' diameter rock rip rap, 20%2 to 3' oF- /7-G <br /> feeHiameter rip-rap and 20% 12"to 18" rock. The 4' diameter rock will be keyed into the °T'`& <br /> bottom of the constructed 31-1:1 V channel through excavation placement not to extend <br /> �110 "high. The check dam will be co tructed in a V-,shapem4h-�the-m1d" a of V'-4ror4* <br /> s„aF.r<< the V situated 4' in slope length, up slope in elevationrap will extend a minimum 4' �� _�rdital <br /> C ? ) up the side slopes. Side slopes a channel will be at a maximum 2H:1V <br /> slope. Positive drainage will be maintained from the bench cut to into the drainage <br /> channel. <br /> Fill Outslope-Small erosion features extend down the sloe approximately 100 feet. <br /> Install a rock check dam every 20 feet as directed by the Project Manager. Rock check <br /> dams shall consist of 18"to 24"using on site material. Rock check dams will be 3' long . <br /> by 3'wide by 2'deep and be keyed i+a depth of 2'. Placement will be such that voids <br /> will be eliminated to the best extent possible with rock contacting rock and smaller rock <br /> used to fill any voids. <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 off and stockpiled. Stockpiled vegetation and soils will be evenly <br /> redistributed over the deposited material JF&m drainage course construction upon completion of <br /> earthmoving procedures. Ieldsr- d <br /> Measurement and Payment <br /> There will be no measurement for payment of Task 3, Rock Check Dams. Payment for this <br /> Task will be reflected in a lump sum bid under Item 3 on the Bid Schedule. This lump sum bid <br /> will cover all costs for excavating, hauling, placing and placing the rip-rap material as described <br /> in these specifications. 0 /L- / - �.tq /&y P,�'j9r•, fs -< <. r- <br /> (aJ /}-eC ess /t 5 <br /> yv ` <br /> Ct <br /> '(41-1 ir- s S- D 4#-ps e l A <br /> (- I'0o55 dT' 14�'" vI <br />