2011-06-20_REVISION - C1981019 (30)

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LITTLE COLLOM POND - PLAN VILW N Scale 1" = 50' W E S AWJ 6650 6640 6630 6620 6610 6600 A6700 6680 6660 6640 6620 6600 0 +00 1 +00 2 +00 3 +00 4 +00 5 +00 6 +00 6700 Al 6680 6660 6640 6620 6600 7+00 ri i! 1 +00 2 +00 3 +00 RIPRAP PROTECTION AND INSTALL & PLACE 18" PAnSHALL FLUME AS SPECIFIED BY FIELD ENGINEER 4 +00 5 +00 6 +00 HOR III= 100' INERT 111=50' 15.c 7+00 8 +00 9 +00 10 +00 6650 B' %Y•MG 6630 6620 6610 '6iy, 11 +00 EMBANKMENT CREST — EL. 6649.0 EMERGENCYSPILLWAY EL 6642.0 - WALKWAY 42" HANDRAILS AS SPECIFIED PRINCIPAL SPILLWAY WITH NCRS ANTI- VORTEX TRASH RACK �EL. 6641.0 AND 30" RISER BARREL. PERFORATIONS PER ELEVATION AS SPECIFIED 3 SEE TABLE BELOW i8" WATERMAN C 20 SLIDING GATE VALVE, EL. INVERT 6626,10 V NORMAL POOL EL. 6630.0 >_ ANTISEEP COLLARS 6 FT (MIN) 76 FIVE REQUIRED ON 20 FT CENTERS 18" 0 GAL STEEL CMP, 14 GAUGE MINIMUM, 8 FTWIDE (MM) KEYWAY e FT (MIN) M DEPTH WITH TH. 7V SIDES 2TZ XSL HELICALLYCORRU(GATEq POLYMER COATED EXTENDING ACROSS ENTIRE ABUTMENT AT 2.o/ SLOPE FABRIC WRAPPED FILTER, TRANSPORTAND PLACE: 120 CUBIC YARDS OF CLEAN, OPEN - GRADED GRAVEL (MINUS 2INCH) APPROX. 1.0 TO 1.2 FEET THICK, 60 FEET IN LENGTH & EXTENDING ACROSS THE ENTIRE FOOTPRINT OF THE LOWER ONE-THIRD OF DOWNSTREAM TOE BELOW ELEV 7468. FILTER FABRIC SHALL BE MIRAH 14ON NON -WOVEN OR EQUIVALENT, AND SHALL COMPLETELY SURROUND THE GRAVEL IN ALL DIMENSIONS ALL FABRIC EDGES SHALL BE PROVIDED WITH 3 FEET OF OVERLAP WITH ADJACENT EDGE. EMBANKMENT DETAILS Scale 1" — 20' Site Preparation: Prior to placing fill, le area should be stripped of organic topsoil or other deleterious materials. Acceptable Fill Materials: Suitable fill materials can be obtained from pond excavations or from nearby sorrow sources. Suitable materials include native clay soils, clayey sand soils, and bedrock materials which are broken down to these soil types (SC, CC, CL and CH). Bedrock materials should be processed to produce a soil like material with maximum particle size of 6 inches, The materials used as embankment fill should have at least 25 percent lines (material finer than No. 200 sieve). The field engineer may approve the use of other materials following appropriate laboratory testing. Unacceptable Fill Materials: Materials not considered suitable for use as embankment fill include cleaner sand and gravel. Also unacceptable are highly carbonaceous materials obtained from bedrock excavations or well- cemented sandstones which do not break down to soil like material, Highly organic soils or materials containing construction debris are also not acceptable. Frozen soil is not acceptable. Fill Placement and Compaction: Embankment fill should be placed in thin horizontal lifts (8 to 12 inches loose thickness). The fill should be moisture conditioned to within 2 percent of optimum moisture content and compacted to at least 95 percent of standard proctor maximum dry density (AS TM D 698). The Placing and spreading of fill materials should be started at the lowest point of the embankment. Fill placement and compaction should be observed and tested by qualified geotechnical engineering firm. Monitoring and Inspections. Monitoring and inspections should be performed by qualified individuals as outlined in Colorado DRMS regulations. Construction Notes: 1. The field engineer shall adjust the dimensions and elevations in the field to ensure that the toltal capacity is less than 20 acre -feet and the embankment height is less that 20.0 feet per MSHA procedures. 2. Hatched area of the spillway and outlet section shall be riprapped with 18 inch median size material. 3. Hatched area of the outlet of the Lower Clean Water diversion shall be nprapped with 200 cubic yards of 24 inch median size material. AREA - CAPACITY TABLE (Revised following as -built survey) ELEVATION AREA AVERAGEAREA CAPACITY INCREMENTAL CUMULATIVE (Feet) (Acres) (Acres) (Acre -Feet) (Acre -Feet) 6621 0.13 6639 0 0 Colovwyo Coal Company APPROVED BY- 0.142 Ow • 5731 State Highway 13 6625 0.16 0.570 0.570 0.403 No. REVISION 6630 0.65 BY 2.013 2.582 Contour annotations, c lean water diversion ditch, 0.927 PR03 6635 1.21 3124111 4.633 7.215 PR03 Delete siphon specs, edit construction note, add riprap 1.605 TOP KRR 6640 2.00 8.026 15.241 2.305 6642 2.61 4.611 19.852 TOTAL CAPACITY 19.85 ACRE -FEET (DESIGN) 6625.0 PERFORATIONS Elevation of Perforations (ft) Diameter of Perforations (in) Number of Perforations per Elevation 6630 1 4 6631 1 4 6638 2 4 6639 2 4 ENGINEERS CERTIFICATION 1, THOMAS C. PETERSON, being a Licensed Professional Engineer in the State of Colorado, do hereby certify that this map has been reviewed by me and that it accurately represents the proposed impoundment. eeee�PO�0 L I N n C•p£p• 32257 �0 •. S�2n�tt '•••.....•� : r�!�i.SiCNAL POND BOTTOM EL 8823,0 P�1y C 4d \i w w� rb� LITTLE COLLOM POND DESIGN DRAWING SCALE: _As Noted M� O DATE: 312312010 DRWG. BY,. TCP `1 Colovwyo Coal Company APPROVED BY- DRWG NG Ow • 5731 State Highway 13 0 Meeker, Colorado 81641 Exh. 7, Item 26 p Figure 1 No. REVISION DATE BY CHK Contour annotations, c lean water diversion ditch, PR03 note style edk. PE can edits. 3124111 TCP KRR PR03 Delete siphon specs, edit construction note, add riprap 5120111 TOP KRR protection on LCW ditch