SW4230101_Plansheet - C5.5 Site Detail_20230526

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INSALLED MAINTENANCE NOTES: CONSTRUCTION SEQUENCE
INSPECT SKIMMER SEDIMENT BASINS AT LEAST WEEKLY AND 1. CLEAR, GRUB, AND STRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION AND ROOT MAT. REMOVE ALL SURFACE SOIL CONTAINING 78z
5' MIN. WIDTH AFTER EACH SIGNIFICANT (ONE-HALF INCH OR GREATER) HIGH AMOUNTS OF ORGANIC MATTER AND STOCKPILE OR DISPOSE OF IT PROPERLY. HAUL ALL OBJECTIONABLE MATERIAL TO THE '�• G� 3
EMBANKMENT RAINFALL EVENT AND REPAIR IMMEDIATELY. REMOVE SEDIMENT DESIGNATED DISPOSAL AREA. PLACE TEMPORARY SEDIMENT CONTROL MEASURES BELOW BASIN AS NEEDED. �y9 �., �J�
TOP OF DAM AND RESTORE THE BASIN TO ITS ORIGINAL DIMENSIONS WHENv11:' �•``��,
/� SEDIMENT ACCUMULATES TO ONE-HALF THE HEIGHT OF THE 2. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY VEGETATION, ORGANIC MATTER, AND OTHER
DIVERSION TARP PROTECTION L PITCH AND BURY TARP FIRST BAFFLE. PULL THE SKIMMER TO ONE SIDE SO THAT THE OBJECTIONABLE MATERIAL. PLACE THE FILL IN LIFTS NOT TO EXCEED 9 INCHES, AND MACHINE COMPACT IT. OVER FILL THE EMBANKMENT 6
DITCH EDGE (MIN. 12") SEDIMENT UNDERNEATH IT CAN BE EXCAVATED. EXCAVATE THE INCHES TO ALLOW FOR SETTLEMENT.
10' MIN FAIRCLOTH SKIMMED OR SEDIMENT FROM THE ENTIRE BASIN, NOT JUST AROUND THE
WEIR LENGT ( SKIMMER OR THE FIRST CELL. MAKE SURE VEGETATION 3. SHAPE THE BASIN TO THE SPECIFIED DIMENSIONS. PREVENT THE SKIMMING DEVICE FROM SETTLING INTO THE MUD BY EXCAVATING A
APPROVED EQUAL) GROWING IN THE BOTTOM OF THE BASIN DOES NOT HOLD DOWN SHALLOW PIT UNDER THE SKIMMER OR PROVIDING A LOW SUPPORT UNDER THE SKIMMER OF STONE OR TIMBER. E
SECTION THRU SPILLWAY THE SKIMMER. 4. PLACE THE BARREL (TYPICALLY 4-INCH SCHEDULE 40 PVC PIPE)ON A FIRM, SMOOTH FOUNDATION OF IMPERVIOUS SOIL. DO NOT USE ^o c
PERVIOUS MATERIAL SUCH AS SAND, GRAVEL, OR CRUSHED STONE AS BACKFILL AROUND THE PIPE. PLACE THE FILL MATERIAL AROUND THE `r° E
SCREEN REPAIR THE BAFFLES IF THEY ARE DAMAGED. RE-ANCHOR THE PIPE SPILLWAY IN 4-INCH LAYERS AND COMPACT IT UNDER AND AROUND THE PIPE TO AT LEAST THE SAME DENSITY AS THE ADJACENT U .E
D SKIMMER WATER NG ACCESSIBLE BAFFLES IF WATER IS FLOWING UNDERNEATH OR AROUND THEM. EMBANKMENT. CARE MUST BE TAKEN NOT TO RAISE THE PIPE FROM THE FIRM CONTACT WITH ITS FOUNDATION WHEN COMPACTING UNDER = z
DEVICE IF THE SKIMMER IS CLOGGED WITH TRASH AND THERE IS WATER THE PIPE HAUNCHES. PLACE A MINIMUM DEPTH OF 2 FEET OF COMPACTED BACKFILL OVER THE PIPE SPILLWAY BEFORE CROSSING IT WITH ~ 2 3
THROUGH DOOR [--
VENT IN THE BASIN, USUALLY JERKING ON THE ROPE WILL MAKE THE CONSTRUCTION EQUIPMENT. IN NO CASE SHOULD THE PIPE CONDUIT BE INSTALLED BY CUTTING A TRENCH THROUGH THE DAM AFTER THE aui
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SKIMMER BOB UP AND DOWN AND DISLODGE THE DEBRIS AND EMBANKMENT IS COMPLETE. o U N
RESTORE FLOW. IF THIS DOES NOT WORK, PULL THE SKIMMER a
OVER TO THE SIDE OF THE BASIN AND REMOVE THE DEBRIS. 5. ASSEMBLE THE SKIMMER FOLLOWING THE MANUFACTURERS INSTRUCTIONS, OR AS DESIGNED. w O o `"' O
PLAN VIEW BAFFLES ALSO CHECK THE ORIFICE INSIDE THE SKIMMER TO SEE IF IT IS '� a
CLOGGED; IF SO REMOVE THE DEBRIS. 6. LAY THE ASSEMBLED SKIMMER ON THE BOTTOM OF THE BASIN WITH THE FLEXIBLE JOINT AT THE INLET OF THE BARREL PIPE. ATTACH THE z u rn
FLEXIBLE JOINT TO THE BARREL PIPE AND POSITION THE SKIMMER OVER THE EXCAVATED PIT OR SUPPORT. BE SURE TO ATTACH A ROPE TO _j In x u
IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE THE SKIMMER AND ANCHOR IT TO THE SIDE OF THE BASIN. THIS WILL BE USED TO PULL THE SKIMMER TO THE SIDE FOR MAINTENANCE. < 6 < w
TOP OF BERM O p
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CAN BE REMOVED AND THE OBSTRUCTION CLEARED WITH A
BAFFLES EMERGENCY PLUMBER'S SNAKE OR BY FLUSHING WITH WATERLLAY . BE SURE AND 7. EARTHEN SPILLWAYS--INSTALL THE SPILLWAY IN UNDISTURBED SOIL TO THE GREATEST EXTENT POSSIBLE. THE ACHIEVEMENT OF PLANNED m z
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ELEIVATION FLOAT REPLACE THE ORIFICE BEFORE REPOSITIONING THE SKIMMER. ELEVATIONS, GRADE, DESIGN WIDTH, AND ENTRANCE AND EXIT CHANNEL SLOPES ARE CRITICAL TO THE SUCCESSFUL OPERATION OF THE L
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SKIMMER SPILLWAY. THE SPILLWAY SHOULD BE LINED WITH LAMINATED PLASTIC OR IMPERMEABLE GEOTEXTILE FABRIC. THE FABRIC MUST BE WIDEGo j
AND LONG ENOUGH TO COVER THE BOTTOM AND SIDES AND EXTEND ONTO THE TOP OF THE DAM FOR ANCHORING IN A TRENCH. THE EDGES w
CHECK THE FABRIC LINED SPILLWAY FOR DAMAGE AND MAKE/,% MAY BE SECURED WITH 8-INCH STAPLES OR PINS. THE FABRIC MUST BE LONG ENOUGH TO EXTEND DOWN THE SLOPE AND EXIT ONTO STABLE �
ANY REQUIRED REPAIRS WITH FABRIC THAT SPANS THE FULL GROUND. THE WIDTH OF THE FABRIC MUST BE ONE PIECE, NOT JOINED OR SPLICED; OTHERWISE WATER CAN GET UNDER THE FABRIC. IF THE w
WIDTH OF THE SPILLWAY. CHECK THE EMBANKMENT, LENGTH OF THE FABRIC IS INSUFFICIENT FOR THE ENTIRE LENGTH OF THE SPILLWAY, MULTIPLE SECTIONS, SPANNING THE COMPLETE WIDTH, ~
TREATMENT BARREL PIPE LONGER THAN SHOWN. SPILLWAYS, AND OUTLET FOR EROSION DAMAGE, AND INSPECT MAY BE USED. THE UPPER SECTION(S)SHOULD OVERLAP THE LOWER SECTION(S)SO THAT WATER CANNOT FLOW UNDER THE FABRIC.
ZONE THE EMBANKMENT FOR PIPING AND SETTLEMENT. MAKE ALL
SECURE THE UPPER EDGE AND SIDES OF THE FABRIC IN A TRENCH WITH STAPLES OR PINS. (ADAPTED FROM "A MANUAL FOR DESIGNING, ui
NECESSARY REPAIRS IMMEDIATELY. REMOVE ALL TRASH AND INSTALLING AND MAINTAINING SKIMMER SEDIMENT BASINS." FEBRUARY, 1999. J. W. FAIRCLOTH &SON.).
OTHER DEBRIS FROM THE SKIMMER AND POOL AREAS. O
INLET SHALL BE FLEXIBLE JOINT 8. INLETS--DISCHARGE WATER INTO THE BASIN IN A MANNER TO PREVENT EROSION. USE TEMPORARY SLOPE DRAINS OR DIVERSIONS WITH =
PROTECTED (AS NEEDED) SEDIMENT ROCK PAD AT (RADIATOR HOSE) FREEZING WEATHER CAN RESULT IN ICE FORMING IN THE BASIN. OUTLET PROTECTION TO DIVERT SEDIMENT- LADEN WATER TO THE UPPER END OF THE POOL AREA TO IMPROVE BASIN TRAP EFFICIENCY
SKIMMER BASE SOME SPECIAL PRECAUTIONS SHOULD BE TAKEN IN THE WINTER (REFERENCES: RUNOFF CONTROL MEASURES AND OUTLET PROTECTION). 0
FROM EROSION WITH STORAGE (FILL TO TOP OF ROCK PAD AT HDPE OUTLET
RIPRAP, TARP, MATTING ZONE SEDIMENT SKIMMER BASE PIPE TO PREVENT THE SKIMMER FROM PLUGGING WITH ICE.
OR EQUIVALENT. STORAGE) OUTLET END: CONNECTION 9. EROSION CONTROL--CONSTRUCT THE STRUCTURE SO THAT THE DISTURBED AREA IS MINIMIZED. DIVERT SURFACE WATER AWAY FROM BARE p
TO OUTLET PIPE OR RISER AREAS. COMPLETE THE EMBANKMENT BEFORE THE AREA IS CLEARED. STABILIZE THE EMERGENCY SPILLWAY EMBANKMENT AND ALL OTHER w
PROPOSED STORM DISTURBED AREAS ABOVE THE CREST OF THE PRINCIPAL SPILLWAY IMMEDIATELY AFTER CONSTRUCTION (REFERENCES: SURFACE = Q
CROSS SECTION STRUCTURE STABILIZATION). u p
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10. INSTALL POROUS BAFFLES AS SPECIFIED IN PRACTICE 6.65 z
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U) DATE
11. AFTER ALL THE SEDIMENT-PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED, REMOVE THE STRUCTURE AND ALL THE UNSTABLE > 05/23/2023
SEDIMENT. SMOOTH THE AREA TO BLEND WITH THE ADJOINING AREAS AND STABILIZE PROPERLY(REFERENCES: SURFACE STABILIZATION).
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DRAWN BY
BASIN DRAIN DISTB. PEAK BASIN SURFACE REQUIRED BASIN REQUIRED BASIN SPILLWAY WIDTH SKIMMER SKIMMER ORIFICE TOP OF BERM EMERGENCY SPILLWAY BOTTOM OF SIDE DEWATERING LMB
NUMBER AREA(ACRES) AREA(ACRES) FLOW(CFS) AREA(SF) SURFACE AREA(SF) VOLUME (CF) VOLUME (CF) (FT) SIZE (IN.) DIAMETER (IN.) ELEV. ELEV. BASIN ELEV. SLOPES TIME (DAYS)
• DESIGNED BY
A 4.31 4.31 18.31 6,500 5,950 14,854 7,758 7 4 1.25 635 634 631.5 3:1 3.72
• GWF
BASIN SIDES AND WEIR SHALL HAVE MAXIMUM SLOPES OF 2:1 OR FLATTER. DIMENSIONS SHOWN ARE AT WEIR ELEVATION OF
BASIN VOLUMES PROVIDED ARE BASED ON AVAILABLE VOLUME AT THE PRINCIPAL SPILLWAY • CHECKED BY
• GWF
• • SCALE
O1 SEDIMENT BASIN WITH STANDARD SKIMMER (NCDENR 6.61) N.T.S. AS SHOWN
TEMPORARY SEEDING SPECIFICATIONS
•
COMPLETE GRADING BEFORE PREPARING SEEDBEDS, AND INSTALL ALL NECESSARY EROSION CONTROL PRACTICES SUCH AS, DIKES, WATERWAYS, AND BASINS. MINIMIZE STEEP SLOPES
BECAUSE THEY MAKE SEEDBED PREPARATION DIFFICULT AND INCREASE THE EROSION HAZARD. IF SOILS BECOME COMPACTED DURING GRADING, LOOSEN THEM TO A DEPTH OF 6-8
INCHES USING A RIPPER, HARROW, OR CHISEL PLOW. IL
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TEMPORARY SEED SCHEDULE (Jan 1 - May 1 ) TEMPORARY SEED SCHEDULE (Oct 1 - Dec 30) SEEDBED PREPARATIONS
GOOD SEEDBED PREPARATION IS ESSENTIAL TO SUCCESSFUL PLANT ESTABLISHMENT. A GOOD SEEDBED IS WELL-PULVERIZED, LOOSE, AND UNIFORM. WHERE HYDROSEEDING METHODS
GRASS SPECIES BLEND PLANTING RATE MIN. % PURE MAX. % WEED GRASS SPECIES BLEND PLANTING RATE MIN. % PURE MAX. % WEED ARE USED,THE SURFACE MAY BE LEFT WITH A MORE IRREGULAR SURFACE OF LARGE CLODS AND STONES. O
SEED SEED SEED SEED LIMING -APPLY LIME ACCORDING TO SOIL TEST RECOMMENDATIONS. IF THE PH (ACIDITY) OF THE SOIL IS NOT KNOWN, AN APPLICATION OF GROUND AGRICULTURAL LIMESTONE AT
ANNUAL RYE GRASS 50-LBS PER 85% 1% ANNUAL RYE GRASS 50-LBS PER 85% 1% THE RATE OF 1 TO 1 1/2 TONS/ACRE ON COARSE-TEXTURED SOILS AND 2-3 TONS/ACRE ON FINE-TEXTURED SOILS IS USUALLY SUFFICIENT. APPLY LIMESTONE UNIFORMLY AND O u
1-ACRE 1-ACRE INCORPORATE INTO THE TOP 4-6 INCHES OF SOIL. SOILS WITH A PH OF 6 OR HIGHER NEED NOT BE LIMED. = 3
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SOIL AMENDMENTS: SOIL AMENDMENTS: • FERTILIZER- BASE APPLICATION RATES ON SOIL TESTS. WHEN THESE ARE NOT POSSIBLE, APPLY A 10-10-10 GRADE FERTILIZER AT 700-1,00 LB/ACRE. BOTH FERTILIZER AND LIME Lr) v
( )
FOLLOW RECOMMENDATIONS OF SOIL TESTS OR APPLY 2,OOLB/ACRE GROUND FOLLOW RECOMMENDATIONS OF SOIL TESTS OR APPLY 2,OOLB/ACRE GROUND SHOULD BE INCORPORATED INTO THE TOP 4-6 INCHES OF SOIL. IF A HYDRAULIC SEEDER IS USED, DO NOT MIX SEED AND FERTILIZER MORE THAN 30 MINUTES BEFORE APPLICATION.
AGRICULTURAL LIMESTONE AND 750 LB/ACRE 10-10-10 FERTILIZER. AGRICULTURAL LIMESTONE AND 1,000 LB/ACRE 10-10-10 FERTILIZER. • SURFACE ROUGHENING - IF RECENT TILLAGE OPERATIONS HAVE RESULTED IN A LOOSE SURFACE, ADDITIONAL ROUGHENING MAY NOT BE REQUIRED, EXCEPT TO BREAK UP LARGE
CLODS. IF RAINFALL CAUSES THE SURFACE TO BECOME SEALED OR CRUSTED, LOOSEN IT JUST PRIOR TO SEEDING BY DISKING, RAKING, HARROWING, OR OTHER SUITABLE METHODS. U
MULCH: MULCH: L
APPLY 4,000 LB/ACRE STRAW. ANCHOR STRAW BY TACKING WITH ASPHALT, APPLY 4,000 LB/ACRE STRAW. ANCHOR STRAW BY TACKING WITH ASPHALT, GROOVE OR FURROW SLOPES STEEPER THAN 3:1 ON THE CONTOUR BEFORE SEEDING (REFER TO THE NCDEQ EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL, O N
NETTING, OR A MULCH ANCHORING TOOL. DISK WITH BLADES SET NEARLY NETTING, OR A MULCH ANCHORING TOOL. DISK WITH BLADES SET NEARLY PRACTICE 6.03, SURFACE ROUGHENING). z
STRAIGHT CAN BE USED AS A MULCH ANCHORING TOOL. STRAIGHT CAN BE USED AS A MULCH ANCHORING TOOL. N
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MAINTENANCE: MAINTENANCE: PLANT SELECTION z
REFERTILIZE IF GROWTH IS NOT FULLY ADEQUATE. RESEED, REFERTILIZE AND REPAIR AND REFERTILIZE DAMAGES AREAS IMMEDIATELY. TOPDRESS WITH 50 . SELECT AN APPROPRIATE SPECIES OR SPECIES MIXTURE FROM TABLE 6.10A FOR SEEDING IN LATE WINTER AND EARLY SPRING,TABLE 6.10B FOR SUMMER, AND TABLE 6.10C FOR FALL. LLJ (D
MULCH IMMEDIATELY FOLLOWING EROSION OR OTHER DAMAGE. LB/ACRE OF NITROGEN IN MARCH. IF IT IS NECESSARY TO EXTEND TEMPORARY z z Q a
COVER BEYOND JUNE 15, OVERSEED WITH 50 LB/ACRE KOBE (PIEDMONT AND • IN THE MOUNTAINS, DECEMBER AND JANUARY SEEDING HAVE POOR CHANCES OF SUCCESS. WHEN IT IS NECESSARY TO PLANT AT THESE TIMES, USE RECOMMENDATIONS FOR FALL U J W .`-
COASTAL PLAIN) OR KOREAN (MOUNTAINS) LESPEDEZA IN LATE FEBRUARY OR AND A SECURELY TACKED MULCH. J LLJ � p o
EARLY MARCH. pp LV
E TEMPORARY SEED SCHEDULE (May 1 - Sept 30) z N ~
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TGRASS SPECIES BLEND PLANTING RATE MIN. % PURE MAX. % WEED • EVENLY APPLY SEED USING A CYCLONE SEEDER (BROADCAST), DRILL, CULTIPACKER SEEDER, OR HYDROSEEDER. USE SEEDING RATES GIVEN IN TABLES 6.10A-6.10C. BROADCAST J U o W
SEED SEED SEEDING AND HYDROSEEDING ARE APPROPRIATE FOR STEEL SLOPES WHERE EQUIPMENT CANNOT BE DRIVEN. HAND BROADCASTING IS NOT RECOMMENDED BECAUSE OF THE p� z °' z
GERMAN MILLET 30-LBS PER DIFFICULTY IN ACHIEVING A UNIFORM DISTRIBUTION. Q In ) o
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0 1-ACRE s5/o 1 /o PERMANENT SEED SCHEDULE (MAY 1-AUGUST 15) • SMALL GRAINS SHOULD BE PLANTED NO MORE THAN 1 INCH DEEP, AND GRASSES AND LEGUMES NO MORE THAN 1/2 INCH. BROADCAST SEED MUST BE COVERED BY RAKING OR U ;
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N SOIL AMENDMENTS: GRASS SPECIES BLEND PLANTING RATE o o CHAIN DRAGGING, AND THEN LIGHTLY FIRMED WITH A ROLLER OR CULTIPACKER. HYDROSEEDED MIXTURES SHOULD INCLUDE A WOOD FIBER (CELLULOSE) MULCH. 2
FOLLOW RECOMMENDATIONS OF SOIL TESTS OR APPLY 2,OOLB/ACRE GROUND MIN. /o PURE MAX. /o WEED JCo
AGRICULTURAL LIMESTONE AND 750 LB/ACRE 10-10-10 FERTILIZER. SEED SEED MULCHING O O 7) o
0 HULLED SUNSTAR OR RIVIERA 200-LBS PER z
-o MULCH: 98% 1% THE USE OF AN APPROPRIATE MULCH WILL HELP ENSURE ESTABLISHMENT UNDER NORMAL CONDITIONS, AND IS ESSENTIAL TO SEEDING SUCCESS UNDER HARSH SITE CONDITIONS (REFER = 3
o APPLY 4,000 LB/ACRE STRAW. ANCHOR STRAW BY TACKING WITH ASPHALT, BERMUDA 1-ACRE o
TO THE NCDEQ EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL, PRACTICE 6.14, MULCHING). HARSH SITE CONDITIONS INCLUDE: 0
a NETTING, OR A MULCH ANCHORING TOOL. DISK WITH BLADES SET NEARLY S
NOTE
STRAIGHT CAN BE USED AS A MULCH ANCHORING TOOL. S PERMANENT SEEDING FOR THIS PROJECT SHALL OCCUR BETWEEN MAY SEEDING IN FALL FOR WINTER COVER (WOOD FIBER MULCHES ARE NOT CONSIDERED ADEQUATE FOR THIS USE), o a)
0 1-AUGUST 15. ADJUSTED AS NECESSARY FOR ADEQUATE GROUND • SLOPES STEEPER THAN 3:1, 2:1 o
MAINTENANCE:
o REFERTILIZE IF GROWTH IS NOT FULLY ADEQUATE. RESEED, REFERTILIZE AND TEMPERATURES. GROUND TEMPERATURES SHALL BE IN THE RANGE OF 60-80 • EXCESSIVELY HOT OR DRY WEATHER, Lu °3
MULCH IMMEDIATELY FOLLOWING EROSION OR OTHER DAMAGE. DEGREES FOR GERMINATION. � S
Co 2. REFER TO SPECIFICATION SECTION 329200 • ADVERSE SOILS (SHALLOW, ROCKY, OR HIGH IN CLAY OR SAND), AND .'- Y
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"' • AREAS RECEIVING CONCENTRATED FLOW. x
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IF THE AREA TO BE MULCHED IS SUBJECT TO CONCENTRATED WATERFLOW, AND IN CHANNELS, ANCHOR MULCH WITH NETTING (REFER TO THE NCDEQ EROSION AND SEDIMENT :5 L
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v CONTROL PLANNING AND DESIGN MANUAL, PRACTICE 6.14, MULCHING). o
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o TEMPORARY SEEDING MAINTENANCE -086
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=1 RESEED AND MULCH AREAS WHERE SEEDING EMERGENCE IS POOR, OR WHERE EROSION OCCURS, AS SOON AS POSSIBLE. DO NOT MOW. PROTECT FROM TRAFFIC AS MUCH AS POSSIBLE. SOB NO. N
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