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<br />i
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<br />662) ) /
<br />6625 1
<br />6630 j
<br />tlet of Clean Water
<br />6635 Div sion (See Exh. 7- 3)
<br />6646
<br />i 664s-
<br />1
<br />EMBANKMENT CREST
<br />15.a <:L 8648.0
<br />GENCYSPILLWAY
<br />It �I j 642.0
<br />I WALKWAYW42 °HANDRAILS AS SPECIFIED
<br />/ 1 SETTLEMENT PRINCIPAL SPILL WAY WITH NCRS AN77- VORTEXTRASH RACK
<br />MONITORING �EL. 8847.0 AND 30" RISER BARREL
<br />i.
<br />RIPRAP PROTECTION AND INSTALL & PLACE 1 PERFORATIONS PER ELEVATION AS SPECIFIED
<br />18" PARSHALL FLUME AS SPECIFIED 1 3 SEE TABLE BELOW
<br />BY FIELD ENGINEER 2 STAFF GAGE 18" WATERMAN C-20 SLIDING GATE VALVE, EL. INVERT 6626.10
<br />v NORMAL POOL
<br />EL. 6630,0
<br />TISEEP COLLARS FT (MIN) mIT_GRO0 "" '- POND BOTTOM
<br />AN
<br />\ EL 6625
<br />FIVE REQUIRED ON 20 FT CENTERS .0
<br />EL 6623.0
<br />\ 0 78" B GALV STEEL CMP, 14 GAUGE MINIMUM,
<br />2- 213 "X1)2" HELICALLY CORRUGATED, POLYMER COATED EXTENDING ACROSS ENTIREABUTMENT
<br />-. AT2.0/ SLOPE e FT WIDE (MIN) KEYWAY6 FT (MIN) IN DEPTH WITH 7H: 7V SIDES
<br />FABRIC WRAPPED FILTER, TRANSPORTAND PLACE:
<br />i 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 MIRAH 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 />EMBANKMENT DETAILS
<br />Scale 1" = 20'
<br />LITTLE COLLOM POND -PLAN VIEW
<br />Scale 1" = 50'
<br />i
<br />N
<br />W E
<br />S
<br />Site Preparation:
<br />Prior to placing rill, the area shall be stripped of organic topsoil or other deleterious materials.
<br />Acceptable Fill Materials:
<br />Suitable fill materials can be obtained from pond excavations or from nearby borrow sources. Suitable materials include natiive clay soils, clayey sand soils,
<br />and bedrock materials which am broken down to these soil types ISM, SC, GM, GC and CL). Bedrock materials shall be processed 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 ,(materlal 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 cleaner sand and gravel (CH,, ML, SP, SW, GP and GIM.
<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 debris are also not acceptable. Frozen soil and mine processing watste are not acceptable,
<br />Fill Placement and Compaction:
<br />Embankment fill shall be placed in thin horizontal lifts (8 to 12 inches loose thickness). The fill shall be moisture conditioned as required to achieve a moisture
<br />content between -2 to +3 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 monitor point 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 />(Feet)
<br />A 6700
<br />AVERAGEAREA
<br />(Acres)
<br />6700 A'
<br />INCREMENTAL
<br />CUMULATIVE
<br />4
<br />_
<br />1
<br />(Acre -Feet)
<br />(Acre -Feet)
<br />6680
<br />0.13
<br />6660
<br />0
<br />0
<br />PILLWAV
<br />0.142
<br />6660
<br />30
<br />6660
<br />0.570
<br />0.570
<br />OP OF DAM
<br />0.403
<br />6640
<br />0.65
<br />6640
<br />2.013
<br />2.582
<br />6620
<br />6620
<br />6600
<br />1.21
<br />6600
<br />4.633
<br />7.215
<br />0 +00
<br />1 +00 2 +00 3 +00 4 +00
<br />5 +00 6 +00 7+00
<br />B
<br />6640
<br />2.00
<br />R'
<br />6650
<br />2.305
<br />6650 u
<br />6640
<br />6642
<br />2.61
<br />6640
<br />_
<br />6630
<br />_
<br />tip' _
<br />6630
<br />6620
<br />�-
<br />-
<br />6620
<br />6610
<br />-
<br />6610
<br />6600
<br />I_ i_
<br />-
<br />6600
<br />0 +00
<br />- -_
<br />1 +00 2 +00 3+00
<br />4 +00 5 +00 6 +00 7+00
<br />8 +00 9+00 10+00
<br />11 +00
<br />HOR III=100'
<br />INERT 111=50'
<br />EMBANKMENT CREST
<br />15.a <:L 8648.0
<br />GENCYSPILLWAY
<br />It �I j 642.0
<br />I WALKWAYW42 °HANDRAILS AS SPECIFIED
<br />/ 1 SETTLEMENT PRINCIPAL SPILL WAY WITH NCRS AN77- VORTEXTRASH RACK
<br />MONITORING �EL. 8847.0 AND 30" RISER BARREL
<br />i.
<br />RIPRAP PROTECTION AND INSTALL & PLACE 1 PERFORATIONS PER ELEVATION AS SPECIFIED
<br />18" PARSHALL FLUME AS SPECIFIED 1 3 SEE TABLE BELOW
<br />BY FIELD ENGINEER 2 STAFF GAGE 18" WATERMAN C-20 SLIDING GATE VALVE, EL. INVERT 6626.10
<br />v NORMAL POOL
<br />EL. 6630,0
<br />TISEEP COLLARS FT (MIN) mIT_GRO0 "" '- POND BOTTOM
<br />AN
<br />\ EL 6625
<br />FIVE REQUIRED ON 20 FT CENTERS .0
<br />EL 6623.0
<br />\ 0 78" B GALV STEEL CMP, 14 GAUGE MINIMUM,
<br />2- 213 "X1)2" HELICALLY CORRUGATED, POLYMER COATED EXTENDING ACROSS ENTIREABUTMENT
<br />-. AT2.0/ SLOPE e FT WIDE (MIN) KEYWAY6 FT (MIN) IN DEPTH WITH 7H: 7V SIDES
<br />FABRIC WRAPPED FILTER, TRANSPORTAND PLACE:
<br />i 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 MIRAH 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 />EMBANKMENT DETAILS
<br />Scale 1" = 20'
<br />LITTLE COLLOM POND -PLAN VIEW
<br />Scale 1" = 50'
<br />i
<br />N
<br />W E
<br />S
<br />Site Preparation:
<br />Prior to placing rill, the area shall be stripped of organic topsoil or other deleterious materials.
<br />Acceptable Fill Materials:
<br />Suitable fill materials can be obtained from pond excavations or from nearby borrow sources. Suitable materials include natiive clay soils, clayey sand soils,
<br />and bedrock materials which am broken down to these soil types ISM, SC, GM, GC and CL). Bedrock materials shall be processed 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 ,(materlal 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 cleaner sand and gravel (CH,, ML, SP, SW, GP and GIM.
<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 debris are also not acceptable. Frozen soil and mine processing watste are not acceptable,
<br />Fill Placement and Compaction:
<br />Embankment fill shall be placed in thin horizontal lifts (8 to 12 inches loose thickness). The fill shall be moisture conditioned as required to achieve a moisture
<br />content between -2 to +3 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 monitor point 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 />(Feet)
<br />AREA
<br />(Acres)
<br />AVERAGEAREA
<br />(Acres)
<br />CAPACITY
<br />INCREMENTAL
<br />CUMULATIVE
<br />4
<br />6631
<br />1
<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 />1, 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 />�'offi llIIII
<br />``p�QPD0 L
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<br />' 32257 '
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<br />-1 R'8! -•v
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