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SW6191002_CG102_12/17/2019
1 1 2 3 M G F E I C IQ n GRADING & STORM DRAINAGE NOTES: 1. TOTAL DISTURBED AREA = 2.59 AC. 2. REFER TO CG501 AND CG512 FOR STORM DRAINAGE STRUCTURES DETAILS. 3. 10-YR PEAK FLOW RATES WERE CALCULATED USING THE RATIONAL METHOD. 4. CONTRACTOR SHALL GRADE THE SITE AS SHOWN AND REPORT ANY ISSUES TO THE SITE ENGINEER. 5. CONTRACTOR SHALL GRADE ALL AREAS TO TRANSITION APPROPRIATELY AND TIE IN TO THE EXISTING GRADE. 6. ALL EXCAVATION SHALL BE PERFORMED SO THAT THE SITE AND THE AREA IMMEDIATELY SURROUNDING THE SITE WHICH AFFECT OPERATIONS SHALL BE CONTINUALLY AND EFFECTIVELY DRAINED DURING ALL PHASES OF CONSTRUCTION. 7. ALL STORM DRAINAGE PIPES SHALL HAVE THEIR JOINTS WRAPPED WITH FILTER FABRIC. FILTER FABRIC SHALL EXTEND 1 FOOT PAST THE JOINT. FILTER FABRIC SHALL HAVE AN OVERLAP OF 18 INCHES. 8. ALL EXISTING MANHOLES WITHIN THE LIMITS OF CONSTRUCTION SHALL BE RAISED OR LOWERED TO MATCH THE NEW FINISHED GRADES. 9. TRENCH BOXES SHALL BE USED TO INSTALL STORM DRAINAGE LINES AROUND EXISTING TREES TO REMAIN. NO FILL FROM THE EXCAVATIONS SHALL BE STOCKPILED WITHIN THE DRIP LINE OF THE TREES TO REMAIN. 10. EXISTING STORM DRAINAGE PIPE TO BE KEPT SEPARATE FROM NEW STORM DRAINAGE NETWORK. 11. THE SITE SHALL BE GRADED TO PROVIDE POSITIVE DRAINAGE AWAY FROM ALL NEW BUILDINGS AND SITE STRUCTURES. 12. ROOF/FOUNDATION DRAIN COLLECTORS SHALL BE SIZED AS SHOWN ON CG PLANS. ALL ROOF/FOUNDATION DRAINS AND COLLECTORS SHALL HAVE A MINIMUM 1.00% SLOPE. ROOF DRAINS SHALL HAVE A MINIMUM 1.0 FT OF COVER AND FOUNDATION DRAINS SHALL HAVE A MINIMUM OF 2.42 FT OF COVER. 13. CLEANOUTS SHALL BE PROVIDED ON ALL ROOF DRAINS WHERE THE PIPE MAKES A TURN OF 45 DEGREES OR SHARPER. *SEE HYDROLOGY REPORT FOR DETAILED CALCULATIONS. **SCS METHOD USED FOR TOTAL AREA TO BE DIRECTED TO AND DRAINED FROM BIORETENTION CELL AND DETENTION POND. SEE HYDROLOGY REPORT FOR MORE DETAILS. DRAINAGE INFORMATION* DRAIN # STRUCTURE DRAINAGE 10-YR PEAK NAME AREA (AC.) FLOW (CFS) 10 Al -D1 0.69 4.64 O2 A3-DI 0.04 0.27 O3 A4-DI 0.21 1.58 O4 * * C1-OCS 1.30 0.72 O5 * * D1-OCS 1.49 0.08 O6 FLUME 0.13 1.02 DRAINAGE AREA BASIN # DRAINAGE AREA (AC.) BUILT -UPON AREA (AC.) PERVIOUS AREA (AC.) CURVE NUMBER (CN) 1❑ 1.33 0.67 0.66 77 2❑ 0.21 0.00 0.21 60 3❑ (BYPASS) 0.29 0.01 0.28 62 ® (BYPASS) 0.59 0.41 0.18 88 5❑ (BYPASS) 0.09 0.01 0.08 70 © (BYPASS) 0.06 0.06 0.00 98 LEGEND CB CATCH BASIN COO SANITARY CLEAN -OUT DI DROP INLET FFE FINISHED FLOOR ELEVATION ✓e JUNCTION BOX NEW CONTOUR 280 -------281 ------ EXISTING CONTOUR 282 X SPOT ELEVATION PVMT. MATCH LINE EXISTING DRAINAGE PIPING EXISTING DROP INLET NEW DRAINAGE PIPING ® NEW DROP INLET LIMITS OF CONSTRUCTION - - - - - - - - - CATCHMENT AREAS NEW CONCRETE a UNCLASSIFIEDHFOR OFFICIAL USE ONLY 7 8 9 10 5 6 MATCHLINE MATCHLINE SEE THIS SHEET ,.1" s SEE THIS SHEET Cl BUILDING 3352 Z / O � U ® WM s I -s < z / l ti6 1 5 0 �I �'': II / U W /0- .3 01 \ / 23p c CLEANOUTS (4) TO BE PLACED EVERY \ \ \ \ _ EX -DI / 22g 10' ALONG LENGTH OF UNDERDRAIN (MISSING LID) STORMWATER 22600 TOP: 233.16 D1 INV- 229.76 \ \ / \ \\ t STORM C -OCS MANAGEMENT M \\ \\ \� �/ \ �` POND �06 JF _ - 232- EX -DI 2j (FULL OF WATER) CONNECTING PIPES UNDETERMINED(D2 HW RIPRAP INFORMATION RIPRAP ID APRON WIDTH @ PIPE OUTLET (FT) APRON WIDTH AT OUTLET END (FT) MAX. STONE DIAMETER (FT) APRON THICKNESS (FT) 4.5 6.0 0.75 1.125 © 4.5 6.0 0.75 1.125 © 6.0 5.6 0.75 1.125 �D 6.0 8.0 0.75 1.125 220 1 25' x 16' DETENTION POND 216 EMERGENCY OVERFLOW, STUDY PT. #1 SEE DETAIL CG501 e ^ STUDY PT. 3,� ✓ �� � //� � 230 - -100' WETLANDS BUFFER BUILDING 3042 �� sG d I II I \ \ / --__ \ \ \� \ \ \ �Q -220 �►� \ \ \ \� \ \ \ \ 1 1 I I I I \ III �®H STORM DRAINAGE PLAN SCALE: 1" = 30' �- _ _� III P UG� IJ♦1GP - _ WETLANDS BDY HEADWALL TOP: 216.70' INV.' 213.28' 100- _-00 100 N LOWE ENGINEERS, LLC. 100 REG. # P-1582 30 0 30 60 90 GRAPHIC SCALE: 1 INCH = 30 FEET M US Army Corps of Engineers L i 0 z Q O w cn UU ui O CD Z w o H 2< U U rn W U w N F U w O I___ (n N �oO�UU J = z F- _ U z o Q 20 <00 z00 0 0 m } m m Q J00 0 m cl Lu � Z U' Z Y tz b -_ (n QQ W 2i of Y W 2 Qm� 2i: w C5 N Z 0 =0 cnU =cnH v0Q 0 o� o� U�o Z w N � z (n U) Q wiz w Z 7i U U C� > of C) �Q � w > W WU) Ld W �j = 2 Y �owO wQzOU)0z¢0 U) fr- O Oz U zO F- _jO �2 a J �V z O J z Q D_ UQ't W '� L0 U' Z rn z Z pO-0- Q 0' N } 0 o`` m LL � 0 oU LL SHEET ID CG102 UNCLASSIFIEDHFOR OFFICIAL USE ONLY READY TO ADVERTISE