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LITTLE COLLOM POND - PLAN VIEW N <br />Scale 1" = 50' W E <br />S <br />HOR >" =100' <br />INERT 1" =50' <br />EMBANKMENT CREST <br />15:d EL 6649.0 <br />EMERGENCY SPILL WAY <br />EL 6642.0 <br />SETTLEMENT W'v -KWAYW 42° HANDRAILS AS SPECIFIED <br />MONITORING PRINCIPAL SPILLWAY WITH NCRS AN77- VORTEX TRASH RACK <br />POINT II,, �EL. 664 1. 0 AND 30" RISER BARREL. <br />RIPRAP PROTEC77ON AND INSTALL & PLACE I PERFORATIONS PER ELEVATION AS SPECIFIED <br />18" PARSHALL FLUME AS SPECIFIED 3 SEE TABLE BELOW <br />BYFIELD ENGINEER 2 STAFF GAGE 18" WATERMAN C-20 SLIDING GATE VALVE, EL INVERT 6626.10 <br />7 NORMAL POOL <br />EL. 6630.0 <br />/ L 18'0 GALV STEEL CMP, 14 GAUGE MINIMUM, <br />2-213'X 112° HELICALLY CORRUGATED, POLYMER COATED <br />AT2.0 %SLOPE <br />FABRIC WRAPPED FILTER, TRANSPORT AND PLACE: <br />120 CUBIC YARDS OF CLEAN, OPEN - GRADED GRAVEL (MINUS 2 INCH) APPROX 1.0 <br />TO 1.2 FEET THICK, 60 FEET IN LENGTH & EXTENDING ACROSS THE ENTIRE FOOTPRINT <br />OF THE LOWER ONE -THIRD OF DOWNSTREAM TOE BELOW ELEV 7468. FILTER FABRIC <br />SHALL BE MIRAFI 14ON NON -WOVEN OR EQUIVALENT, AND SHALL COMPLETELY <br />SURROUND THE GRAVEL IN ALL DIMENSIONS. ALL FABRIC EDGES SHALL BE PROVIDED <br />WITH 3 FEET OF OVERLAP WITH ADJACENT EDGE. <br />Site Preparation: <br />Prior to placing fill, the area shall be stripped of organic topsoil or other deleterious materials. <br />6 Fr (MIN) EL 0625.0 — POND BOTTOM <br />20 FT CENTERS EL. 6623.0 <br />a FT WIDE (MIN) KFYWAY6 FT (MIN) IN DEPTH WITH 1H_-IV SIDES <br />EXTENDING ACROSS ENTIRE ABUTMENT <br />EMBANKMENT DETAILS <br />Scale 1" = 29 <br />Acceptable Fill Materals: <br />Suitable fill materials can be obtained from pond excavations or from nearby borrow sources. Suitable materials include native clay soils, clayey sand soils, <br />and bedrock materials which are broken down to these soil types ISM, SC, GM, GC and CL). Bedrock materials shall be proocessed to produce a soil like <br />material with maximum particle size of 6 inches. The materials used as embankment fill shall have at least 25 percent fines ('material finer than No. 200 sieve). <br />The field engineer may approve the use of other materials following appropriate laboratory testing. <br />Unacceptable Fill Materials: <br />Materials not considered suitable for use as embankment fill include high plasticity clay, silts and c leaner sand and gravel (CH, ML, SP, S VV GP and GIA9. <br />Also unacceptable are highly carbonaceous materials obtained from bedrock excavations or well - cemented sandstones which do not break down to soil like material. <br />Highly organic soils or materials containing construction debits are also not acceptable. Frozen soil and mine processing waste are not acceptable. <br />Fill Placement and Compaction: <br />Embankment fill shall be placed in thin horizontal lifts Is to 12 inches loose thickness). The fill shall be moisture conditioned as required to achieve a moisture <br />content between -3 to +2 percent of optimum moisture content and compacted to at least 95 percent of standard proctor maximum dry density (ASTM D 698). <br />The placing and spreading of fill materials shall be started at the lowest point of the embankment. Fill placement and compaction shall be observed and tested by <br />qualified geotechnical engineering firm. <br />Monitoring and Inspections: <br />Monitoring and inspections shall be performed by qualified individuals as outlined in Colorado DRMS regulations. Once monitoring point shall be set at the crest of the <br />embankment approximately over the outlet works or as otherwise directed by the inspector. The northing, easting, and elevation of the monitorpoint shall be measured <br />at completion of construction and thereafter at approximately 3 month intervals for one year. <br />Construction Notes: <br />1. The field engineer shall adjust the dimensions and elevations in the field to ensure that the total) capacity is less than 20 <br />acre -feet and the embankment height is less that 20.0 feet per MSHA procedures. <br />2. Hatched area of the spillway and outlet section shall be riprapped with 18 inch median <br />size material. <br />3. Hatched area of the outlet of the Lower Clean Water diversion shall be riprapped with 200 cubic yards of 24 inch median <br />size material. <br />AREA - CAPACITY TABLE <br />ELEVATION <br />A 6700 <br />8700 A, <br />CAPACITY <br />INCREMENTAL <br />6680 <br />6660 <br />(Acres) <br />(Acres) <br />(Acre -Feet) <br />PILLWAV <br />6621 <br />0.13 <br />6660 <br />30 6660 <br />0 <br />OP OF DAM <br />6640 <br />6640 <br />0.570 <br />6620 <br />6620 <br />0.403 <br />6600 <br />1 1 6600 <br />6630 <br />0.65 <br />0 +00 <br />1 +00 2 +00 3 +00 4 +00 5 +00 6 +00 7+00 <br />2.582 <br />B <br />0.927 <br />QI <br />6650 <br />6635 <br />1.21 <br />6650 Q <br />6640 <br />6630 <br />7.215 <br />1.605 <br />6640 <br />2.00 <br />8.026 <br />15.241 <br />6640 <br />6630 <br />/ <br />6642 <br />2.61 <br />4.611 <br />19.852 <br />TOTAL CAPACITY 19.85 ACRE -FEET (DESIGN) <br />6620 <br />6620 <br />6610 �— <br />6610 <br />6600 <br />6600 <br />0 +00 1 +00 <br />2 +00 3 +00 <br />4 +00 5 +00 6 +00 7 +00 8 +00 9 +00 10 +00 <br />11 +00 <br />HOR >" =100' <br />INERT 1" =50' <br />EMBANKMENT CREST <br />15:d EL 6649.0 <br />EMERGENCY SPILL WAY <br />EL 6642.0 <br />SETTLEMENT W'v -KWAYW 42° HANDRAILS AS SPECIFIED <br />MONITORING PRINCIPAL SPILLWAY WITH NCRS AN77- VORTEX TRASH RACK <br />POINT II,, �EL. 664 1. 0 AND 30" RISER BARREL. <br />RIPRAP PROTEC77ON AND INSTALL & PLACE I PERFORATIONS PER ELEVATION AS SPECIFIED <br />18" PARSHALL FLUME AS SPECIFIED 3 SEE TABLE BELOW <br />BYFIELD ENGINEER 2 STAFF GAGE 18" WATERMAN C-20 SLIDING GATE VALVE, EL INVERT 6626.10 <br />7 NORMAL POOL <br />EL. 6630.0 <br />/ L 18'0 GALV STEEL CMP, 14 GAUGE MINIMUM, <br />2-213'X 112° HELICALLY CORRUGATED, POLYMER COATED <br />AT2.0 %SLOPE <br />FABRIC WRAPPED FILTER, TRANSPORT AND PLACE: <br />120 CUBIC YARDS OF CLEAN, OPEN - GRADED GRAVEL (MINUS 2 INCH) APPROX 1.0 <br />TO 1.2 FEET THICK, 60 FEET IN LENGTH & EXTENDING ACROSS THE ENTIRE FOOTPRINT <br />OF THE LOWER ONE -THIRD OF DOWNSTREAM TOE BELOW ELEV 7468. FILTER FABRIC <br />SHALL BE MIRAFI 14ON NON -WOVEN OR EQUIVALENT, AND SHALL COMPLETELY <br />SURROUND THE GRAVEL IN ALL DIMENSIONS. ALL FABRIC EDGES SHALL BE PROVIDED <br />WITH 3 FEET OF OVERLAP WITH ADJACENT EDGE. <br />Site Preparation: <br />Prior to placing fill, the area shall be stripped of organic topsoil or other deleterious materials. <br />6 Fr (MIN) EL 0625.0 — POND BOTTOM <br />20 FT CENTERS EL. 6623.0 <br />a FT WIDE (MIN) KFYWAY6 FT (MIN) IN DEPTH WITH 1H_-IV SIDES <br />EXTENDING ACROSS ENTIRE ABUTMENT <br />EMBANKMENT DETAILS <br />Scale 1" = 29 <br />Acceptable Fill Materals: <br />Suitable fill materials can be obtained from pond excavations or from nearby borrow sources. Suitable materials include native clay soils, clayey sand soils, <br />and bedrock materials which are broken down to these soil types ISM, SC, GM, GC and CL). Bedrock materials shall be proocessed to produce a soil like <br />material with maximum particle size of 6 inches. The materials used as embankment fill shall have at least 25 percent fines ('material finer than No. 200 sieve). <br />The field engineer may approve the use of other materials following appropriate laboratory testing. <br />Unacceptable Fill Materials: <br />Materials not considered suitable for use as embankment fill include high plasticity clay, silts and c leaner sand and gravel (CH, ML, SP, S VV GP and GIA9. <br />Also unacceptable are highly carbonaceous materials obtained from bedrock excavations or well - cemented sandstones which do not break down to soil like material. <br />Highly organic soils or materials containing construction debits are also not acceptable. Frozen soil and mine processing waste are not acceptable. <br />Fill Placement and Compaction: <br />Embankment fill shall be placed in thin horizontal lifts Is to 12 inches loose thickness). The fill shall be moisture conditioned as required to achieve a moisture <br />content between -3 to +2 percent of optimum moisture content and compacted to at least 95 percent of standard proctor maximum dry density (ASTM D 698). <br />The placing and spreading of fill materials shall be started at the lowest point of the embankment. Fill placement and compaction shall be observed and tested by <br />qualified geotechnical engineering firm. <br />Monitoring and Inspections: <br />Monitoring and inspections shall be performed by qualified individuals as outlined in Colorado DRMS regulations. Once monitoring point shall be set at the crest of the <br />embankment approximately over the outlet works or as otherwise directed by the inspector. The northing, easting, and elevation of the monitorpoint shall be measured <br />at completion of construction and thereafter at approximately 3 month intervals for one year. <br />Construction Notes: <br />1. The field engineer shall adjust the dimensions and elevations in the field to ensure that the total) capacity is less than 20 <br />acre -feet and the embankment height is less that 20.0 feet per MSHA procedures. <br />2. Hatched area of the spillway and outlet section shall be riprapped with 18 inch median <br />size material. <br />3. Hatched area of the outlet of the Lower Clean Water diversion shall be riprapped with 200 cubic yards of 24 inch median <br />size material. <br />AREA - CAPACITY TABLE <br />ELEVATION <br />AREA <br />AVERAGEAREA <br />CAPACITY <br />INCREMENTAL <br />CUMULATIVE <br />(Feet) <br />(Acres) <br />(Acres) <br />(Acre -Feet) <br />(Acre -Feet) <br />6621 <br />0.13 <br />6639 <br />0 <br />0 <br />0.142 <br />6625 <br />0.16 <br />0.570 <br />0.570 <br />0.403 <br />6630 <br />0.65 <br />2.013 <br />2.582 <br />0.927 <br />6635 <br />1.21 <br />4.633 <br />7.215 <br />1.605 <br />6640 <br />2.00 <br />8.026 <br />15.241 <br />2.305 <br />6642 <br />2.61 <br />4.611 <br />19.852 <br />TOTAL CAPACITY 19.85 ACRE -FEET (DESIGN) <br />PERFORATIONS <br />Elevation of <br />Perforations (ft) <br />Diameter of <br />Perforations (in) <br />Number of <br />Perforations per <br />Elevation <br />6630 <br />1 <br />4 <br />6631 <br />1 <br />4 <br />6638 <br />2 <br />4 <br />6639 <br />2 <br />4 <br />ENGINEERS CERTIFICATION <br />I, THOMAS C. PETERSON, being a <br />Licensed Professional Engineer in <br />the State of Colorado, do hereby <br />certify that this map has been <br />reviewed by me and that it accurately <br />represents the proposed impoundment <br />I _ p 0 L <br />O l�qS C • PFrF9 ?�. <br />32257 <br />moo': 1914/o •r �� <br />��O . ns ` S f 0 N d I•• F-� G. O `� <br />No 32257 <br />P.E. 04i if <br />DATE <br />-, X11 <br />"N <br />o`" o�p&n9 " °d5 <br />