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EMERGENCY SPILLWAY <br />I <br />of N <br />300' 600, <br />RECEIVED <br />JAN 2 9 2020 <br />DIVISION OF RECLAMATION <br />MINING & SAFETY <br />Map C-4 Stormwater Designs <br />Ralston Quarry <br />Asphalt Paving Co. <br />DRMS Permit Number: M-1 974-086 <br />Mine Entry Location: Latitude: 39.81222 Longitude: 105.23139 N <br />State: CO County: Jefferson Nearest Town: Arvada <br />Section: 4 Township: 3S Range: 70W PM: 6th <br />Major Watershed: ---- of 500' 1000, <br />Map Scale: 100 <br />Map Georeferencing Information: Datum: NAD83 Projection: CO Central <br />Survey Source: Google & Drone Survey Date: 2010 & 2018 <br />Imagery Source: Google & Drone Imagery Date: 08/16/18 <br />Drawn by: BEL Date: 01/22/20 <br />Checked by: BEL Date: 01/24/20 <br />Approved by: GL Date: 01/24/20 <br />File Name: EAWork\Dropbox (GLA)\Asphalt Paving Company\Raiston QuarrylAutoCAD\Ralston Quarry 200120.dwg <br />Greg Lewicki And Associates <br />000e <br />NNOW" <br />3375 W Powers Circle Phone (303)-346")-5196 <br />Littleton, CO 80123 E-Mail - info@lewwicki.biz <br />6200' <br />6180' <br />6160' <br />6140' <br />6120' <br />0 <br />0 <br />0 <br />South Pond <br />MAX. WATER LEVEL <br />6170.2'ELEV. <br />LEGEND <br />BOUNDARIES <br />DRIVIS Permit Boundary <br />CROSS SECTION TOPOGRAPHY <br />Baseline <br />Mining <br />Reclaimed <br />0 <br />0 <br />0 <br />0 0 0 0 0 <br />N <br />41:1- <br />(0 <br />00 0 N (0 <br />c� <br />c� <br />c� <br />ca � � r-- �- <br />M-1974-083 <br />Stage Storage Curve <br />North Pond <br />6172 <br />6171 <br />(171.20) <br />6170 <br />6169 <br />U' <br />6168 <br />2 <br />6167 <br />- <br />.2 <br />6166 <br />6165 <br />6164 <br />6163 <br />PRINCIPAL LEVEL (6162.50) <br />SPILLWAY (6162.50) <br />6162 <br />BOTTOM OF POND (6162.0) <br />0.00 <br />0.70 0.82 <br />1.63 <br />Accumulative Storage (Acre -Ft) <br />Storage volume computations <br />M-1974-083 <br />North Pond <br />ELEV. <br />Width <br />LENGTH <br />AREA AVG. INTERVAL STORAGE <br />ACC. <br />STAGE <br />(ft) <br />(ft) <br />(ac) AREA (ft) <br />(ac-ft) <br />STORAGE <br />INTERVAL <br />(ac) <br />(ac-ft) <br />(ft) <br />6162.00 <br />6162.00 <br />6162.00 <br />0.0100 <br />6162.50 <br />N/A <br />NIA <br />0.0213 0.0156 0.50 <br />0.0078 <br />0,0078 <br />0.50 <br />6163.00 <br />6163.00 <br />6163.00 <br />0.0326 0.0213 0.50 <br />0.0135 <br />0.0213 <br />1.00 <br />6164.00 <br />6164.00 <br />6164.00 <br />0.0466 0.0396 1.00 <br />0.0396 <br />0,0609 <br />2.00 <br />6165.00 <br />6165,00 <br />6165.00 <br />0.0613 0.0540 1.00 <br />0.0540 <br />0.1148 <br />3.00 <br />6166.00 <br />6166.00 <br />6166.00 <br />0.0769 0.0691 1.00 <br />0.0691 <br />01839 <br />4.00 <br />616T00 <br />6167,00 <br />6167.00 <br />0.0931 0-0850 1.00 <br />0.0850 <br />0.2689 <br />5.00 <br />6168.00 <br />6168,00 <br />6168.00 <br />0.1102 0.1016 1.00 <br />0.1017 <br />0,3706 <br />6.00 <br />6169.00 <br />6169.00 <br />6169.00 <br />01280 0.1191 1.00 <br />0.1191 <br />0.4897 <br />7.00 <br />6170.00 <br />6170.00 <br />6170.00 <br />0.1466 0.1373 1.00 <br />0.1373 <br />0.6270 <br />8.00 <br />6170.20 <br />N/A <br />NIA <br />0.1505 0.1485 0.20 <br />0.0297 <br />0,6567 <br />8.20 <br />6171.20 <br />6171.20 <br />6171.20 <br />0.1700 0.1583 1.00 <br />0.1603 <br />0,8170 <br />9.20 <br />0047151 <br />NA <br />6200' <br />6180' <br />6160' <br />6140' <br />6120' <br />South Pond EM. SPILLWAY DE <br />2 <br />151- <br />DEPTH OF FLOW = 0.5' <br />DISCHARGE CAPACITY = 15 CFS <br />1 0-YR 24-H R EVENT: <br />0.69 ac-ft, 12.7 cfs <br />Collection Ditch Designs <br />Ditches C-1 & C-2 <br />0.6 ft. 0.50 ft. Freeboard <br />2 2 <br />2.50 ft. <br />Ditches C-1 & C-2 <br />Trapezoidal Channel <br />Equal Side Slopes <br />Channel Lining: Graded silts to cobbles <br />(excavated in existing material) <br />Capacity: 8.3 CFS on 20% grade (3.75ft/s) <br />Ditch C-4 <br />1.0 ft. <br />0.50 ft. Freeboard <br />17 <br />2 2 <br />7.5 ft. <br />Ditch C-4 <br />Trapezoidal Channel <br />Equal Side Slopes <br />Channel Lining: Riprap D. = 12-inch <br />Capacity: 60 CFS on 4.5% grade (6.7 ft/s) <br />ROCK STORMWATER FILTER BERM DETAIL <br />ROCK STORMWATER <br />FILTER BERM <br />6'TALL <br />3H:1V SIDESLOPE <br />D so = 811 <br />1.0' Ditch Flow Requirements <br />Ditch Inflow Area (acres) Discharge (CFS) <br />C-1 2.3 6.0 <br />C-2 2.5 6.7 <br />C-3 10.8 16.1 <br />C-4 6.7 28.2 (16.1+12.1) <br />Ditch C-3 <br />- 1.2 ft. <br />0.50 ft. Freeboard <br />2 2 <br />2.0 ft. <br />Ditch C-3 <br />Trapezoidal Channel <br />Equal Side Slopes <br />Channel Lining: Riprap Da, = 6-inch <br />Capacity: 23 CFS on 1.7% grade (4.3 ft/s) <br />NOTES: <br />• DITCH C-3 MUST HAVE CAPACITY O)F ITS OWN DRAINAGE AND <br />A SUBSURFACE DRAINAGE SYSTEW <br />• DITCH C-4 MUST HAVE CAPACITY O)F ITS OWN DRAINAGE <br />AREA PLUS DITCH C-3 AND SUBSURFACE DRAINAGE S)YSTEM <br />• CURVE NUMBER OF 79 USED IN ALL RUNOFF CALLS. <br />• DITCHES C-3 THROUGH C-4 ARE DESIGNED TO BE <br />NON -EROSIVE BUT TEMPORARY <br />• 10-YR EVENT USED FOR ALL DITCH DESIGNS AND POND] <br />DESIGN <br />