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HomeMy WebLinkAboutWPO201800027 Plan - VSMP 2020-05-11MARTHA JEFFERSON HOSPITAL APARTMENTS GENERAL NOTES OWNER: PRESIDIO PANTOPS, LLC 455 SECOND ST SE, 5TH FLOOR CHARLOTTESVILLE, VA 22902 DEVELOPER: RIVERBEND DEVELOPMENT 455 SECOND STREET SE, SUITE 400 CHARLOTTESVILLE, VA 22902 (434) 245-4970 ENGINEER: COLLINS ENGINEERING 200 GARRETT ST, SUITE K CHARLOTTESVILLE, VA 22902 (434) 293-3719 TAX MAP NO.: 07800-00-00-02OM6 DB 5224 PG 198 TOTAL PROJECT AREA: 26.98 ACRES TOTAL ZONING: PLANNED DEVELOPMENT MIXED COMMERCIAL WITH PROFFERS (ZMA 01-015), PRESERVED AND MANAGED STEEP SLOPES OVERLAY AREA. 100 YR FLOODPLAIN OVERLAY DISTRICT TOPO & SURVEY: SURVEY PROVIDED BY ROUDABUSH & GALE DATED JUNE, 2017. TOPOGRAPHY IS AERIAL SURVEY PERFORMED BY VIRGINIA RESOURCE MAPPING DATED JANUARY, 2006. TOPO FIELD VERIFIED BY COLLINS ENGINEERING PRIOR TO CONSTRUCTION. DATUM: NAD83, NAVD 88 PRE -CONSTRUCTION TERRAIN: UNDEVELOPED PROPERTY SLOPING DOWN TOWARD THE RIVANNA RIVER AND INTERSTATE 64. PRE -CONSTRUCTION VEGETATION: WOODED WATER SUPPLY PROTECTION AREA: N/A WATERSHED / WATER RESOURCE AREA: RIVANNA RIVER DRAINAGE BASIN UTILITIES (WATER AND SEWER): COUNTY PUBLIC WATER AND SANITARY SEWER AGRICULTURAL/ FORESTAL DISTRICT: NONE PHASING: THIS SITE SHALL BE DEVELOPED IN ONE PHASE. STREAM BUFFERS/FLOODPLAIN: THE STREAM BUFFERS SHOWN HEREIN SHALL BE MANAGED IN ACCORDANCE WITH THE ALBEMARLE COUNTY WATER PROTECTION ORDINANCE. THIS PARCEL IS WITHIN ZONE X "AREA OF MINIMAL FLOOD HAZARD", PER FEMA MAP NUMBER 51003CO289D ADOPTED FEBRUARY 4, 2005. NO IMPACTS ARE PROPOSED FOR THE 100 YEAR FLOODPLAIN. THE PROPERTY IS WITHIN A STATE DAM INUNDATION ZONE AND FEDERAL DAM INUNDATION ZONE ALONG THE RIVANNA RIVER. ALL PROPOSED DEVELOPMENT SHALL BE LOCATED OUTSIDE OF THE LIMITS OF THE INUNDATION ZONES. CRITICAL SLOPES: MANAGED STEEP SLOPES AND PRESERVED STEEP SLOPES ARE EXISTING ON SITE AS SHOWN ON THE PLAN. IMPACTS TO MANAGED SLOPES ARE CONSISTENT WITH THE ALBEMARLE COUNTY ZONING ORDINANCE. NO IMPACTS ARE PROPOSED TO THE EXISTING PRESERVED SLOPES. BURIAL SITES: NO CEMETERIES WERE FOUND DURING FIELD INVESTIGATION OF THE SITE. STORMWATER MANAGEMENT: A LEVEL II WET POND IS PROPOSED WITH THIS DEVELOPMENT. THE WET POND WILL PROVIDE STORMWATER QUALITY AND QUANTITY TREATMENT FOR THE MAJORITY OF THE PROPOSED IMPROVEMENTS. THE REMAINING WATER QUALITY REQUIREMENTS WILL BE MET THROUGH THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS. ADDITIONALLY, THE VAST MAJORITY OF THE REMAINING PROPOSED IMPROVEMENTS WILL RECEIVE STORMWATER QUANTITY TREATMENT VIA A PROPOSED DRY DETENTION CELL. VSMP PLAN AMENDMENT #1 PROPOSED CHANGES: SHEET 1 : 1. THE'STORMWATER MANAGEMENT' SECTION OF SHEET 1's GENERAL NOTES WAS UPDATED. : 2. THE SHEET INDEX WAS REVISED. : SHEET 2 3. THE APPROVED VSMP's SHEET 2 WAS REPLACED WITH SHEET 2 FROM THE SDP 201900075 CURRENTLY UNDER REVIEW. : SHEET 3 4. THE 'EROSION CONTROL NOTES & NARRATIVE' SECTION WAS UPDATED TO REFLECT THE ADDITION OF EROSION & SEDIMENT CONTROL PHASES II AND III. SHEET 4 5. APPROVED SEDIMENT TRAP #1 BECAME PROPOSED SEDIMENT BASIN #2. THIS TEMPORARY SEDIMENT TRAPPING FACILITY WAS ENLARGED TO MATCH THE FOOTPRINT OF THIS AMENDMENT's ENLARGED PERMANENT DRY DETENTION CELL. 6. A NEW SEDIMENT TRAP, NOW LABELED SEDIMENT TRAP #1 WITH THIS AMENDMENT, HAS BEEN ADDED. 7. THE LOCATIONS OF THE CONTRACTOR PARKING AREA, STAGING AREA, PORTA POTTIES, DUMPSTER AND FUELING TANK WERE SHIFTED SLIGHTLY TO REMAIN IN THE SAME LOCATION FOR A LONGER PERIOD OF TIME (i.e. TO REMAIN IN THE SAME LOCATION THROUGH THE BULK OF THE MASS GRADING OPERATIONS SHOWN ON ESC PHASE II). SHEETS 4A & 413 ; 8. SHEETS 4A & 413 WERE ADDED TO THIS AMENDMENT TO PROVIDE A PHASE II AND PHASE III EROSION & SEDIMENT CONTROL PLAN. 9. THE LIMITS OF DISTURBANCE INCREASED WITH THE ADDITION OF ESC PHASES II AND III. SHEET 5 10. THE CALCULATIONS AND DETAIL FOR SEDIMENT BASIN #2 (FORMERLY SEDIMENT TRAP #1) WERE UPDATED. SHEET 6 11. THE APPROVED DRY DETENTION CELL (PROVIDING STORMWATER QUANTITY, NOT QUALITY TREATMENT) WAS : ENLARGED AND THE PREVIOUSLY APPROVED UNDERGROUND DETENTION SYSTEM WAS REMOVED. THESE : REVISIONS DO NOT IMPACT POST -DEVELOPMENT SUBAREA A IN THE APPROVED STORMWATER MANAGEMENT : PLAN. THIS AMENDMENT PROVIDES ACCOMPANYING CALCULATIONS SHOWING CONTINUED STORMWATER : QUANTITY COMPLIANCE FOR SUBAREA B. : 12. WITH THE INCREASE IN THE LIMITS OF DISTURBANCE NOTED ABOVE, REVISED WATER QUALITY CALCULATIONS : HAVE BEEN PROVIDED. THE AMENDMENT REQUIRES A NUTRIENT CREDIT PURCHASE OF AN ADDITIONAL 0.44 Ibs/yr. : OF PHOSPHOROUS. : 13. SUBAREA C WAS REMOVED FROM THE ANALYSIS. THE APPROVED PLAN RELEASED UNCAPTURED RUNOFF FROM THE SOUTHWESTERN MOST PORTION OF THIS DEVELOPMENT (i.e. THE SOUTH WESTERN MOST PARKING LOT). THE SDP 201900075 CURRENTLY UNDER REVIEW NOW PROPOSES INLETS AT THE PERIMETER OF THE PARKING LOT/SUBAREA B AND DIRECTS THIS RUNOFF TO THE DRY DETENTION CELL. SHEET 7 14. NO REVISIONS WERE REQUIRED TO THE APPROVED LEVEL II WET POND PROVIDING STORMWATER QUANTITY AND QUALITY TREATMENT. THERE ARE NO CHANGES TO THIS APPROVED SHEET. SHEET 8 15. THE UNDERGROUND DETENTION SYSTEM's DETAILS WERE REMOVED. 16. THE APPROVED DRY DETENTION CELL PROVIDING STORMWATER QUANTITY TREATMENT FOR SUBAREA B WAS ENLARGED AND THE DETAIL AND PROFILES WERE UPDATED. THE FACILITY WAS ENLARGED TO COMPENSATE FOR THE REMOVAL OF THE UNDERGROUND DETENTION SYSTEM. SHEET 9 17. THE UNDERGROUND DETENTION SYSTEM DETAILS WERE REMOVED FROM THIS SHEET. � TMP: 07800-00-00-02oM4 OWNER: MARTHA JEFFERSON HOSPITA ZONING: PLANNED DEVELOPMENT MIX COMMERCIAL ACREA DB/PG GE 4935/5 0 VSMP PLAN (AMENDMENT #1 TO WP0201800027) RIVANNA MAGISTERIAL DISTRICT ALBEMARLE COUNTY, VIRGINIA TMP: 07800-oo-00-02oFo OWNER: JDM II SF NATIONAL LLC C/O STATE FARM MUTUA AUTOMOBILE ZONING: COMMERCIAL OFFICE / ACREAGE: 35.00 AC d / / / TMP: 07800-00-00-020Jo OWNER: JDM II SF NATIONAL LLC C/O STATE FARM MUTUAL AUTOMOBILE ZONING: COMMERCIAL OFFICE / ACREAGE: 19.88AC DB/PG: 4475/728 / ALKtA(�t: 26.9ts AL DB/PG: 5224/198 f' r' o, TMP: 07800-00-00-02oM1 OWNER: WORRELL LAND & DEVELOPMENT COMPANY LLC ' `. ZONING: PLANNED DEVELOPMENT MIXED COMMERCIAL ACREAGE: 29.63 AC DB/PG: 4o69/267, 2544/249, 2607/572, 1673/618 _ _ _ - - - - - - _ - _ TMP: 07800-00-00-020M1 OWNER: WORRELL LAND & DEVELOPMENT COMPANY LLC ZONING: PLANNED DEVELOPMENT ' o - MIXED COMMERCIAL ACREAGE: 29.63 AC DB/PG: 4o69/267, 2544/249, 260 2 16 618 - / \ To SHEET INDEX TITLE SHEET COVER 1 EXISTING CONDITIONS 2 EROSION & SEDIMENT CONTROL PLAN NARRATIVE 3 EROSION & SEDIMENT CONTROL PLAN 4 PHASE II EROSION & SEDIMENT CONTROL PLAN 4A PHASE III EROSION & SEDIMENT CONTROL PLAN 4B EROSION & SEDIMENT CONTROL DETAILS & CALCULATIONS 5 STORMWATER MANAGEMENT PLAN 6 LEVEL II WET POND DETAILS 7 DRY DETENTION CELL DETAILS 8 GENERAL STORMWATER MANAGEMENT NOTES & DETAILS 9 TOTAL SHEETS 11 SHEET LAYOUT SCALE: 1" = 100' CD 0 C�� o ELF �0GT SAP �JF y�/p 2'rO �o e0 �NTERST ATE 64 VICINITY MAP SCALE: 1" = 1000' VIRGINIA EROSION & SEDIMENT EROSION CON TROL * HANDBOOK SPECIF CA TION NUMBER CONTROL STB STRAW BAIL BARRIER 3.04 DD D V TEMPORARY DIVERSION DIKE 3.09 ST ��°o�♦ TEMPORARY SEDIMENT TRAP 3.I3 SB COD SEDIMENT BASIN 3.14 lP INLET PROTECTION 3.07 SFX x X SILT FENCE 3.05 CEO °� o 0 CONSTRUCTION ENTRANCE 3.02 CD ' CHECK DAM 3.20 FD TEMPORARY FILL DIVERSION 3.10 D V DI VERSION 3.12 PS_-8- PS PERMANENT SEEDING 3.32 TO TO TOPSOILING 3.30 ClP CULVERT INLET PROTECTION 3.08 DC DC DUST CONTROL 3.39 TSD - TEMPORARY SLOPE DRAIN 3.15 SA SAFETY FENCE 3.01 RW PI TEMPORARY RIGHT-OF-WAY 3.11 DIVERSION i0_lf7 EXISTING CULVERT DROP INLET & STRUCTURE NO. CURB CURB & GUTTER PROPOSED ASPHAL T PROPOSED CONCRETE PROPOSED PAVER (IMPERVIOUS) BENCH MARK VDOT STANDARD STOP SIGN EXISTING CONTOUR PRESERVED STEEP SLOPES MANAGED STEEP SLOPES 004,07VTH 0 i � �� I I' SCOTT R. COLLINS`', L� No. 35791 � ��SSIONAL E��Z Z z aQ m Luc'n 0 J �••� o cn z LuLu w 0 w N Q M L9 z co CW G N M z Lu CNDLu Q N z N Q N J Q > Lu J_ > U) Lu w w w U Q U Lu Q J zw -U) z J � o w cn J QLu LL p Lu O r-) N Q L Lu z w w a U) JOB NO. 172131 SCALE AS SHOWN SHEET NO. 1 NOTES:— \ 1. THIS PROJECT IS LOCATED WITHIN FLOODPLAIN LIMITS, BASED ON FEMA MAP / NUMBER 51003CO289D ADOPTED FEBRUARY 4, 2005. 1 MATCHLINE A - S E THIS SHEET 0BI ; �TH �� � � � c NC � 40.4 Q BENCHMARK - EX�STI G/ 2. SURVEY PROVIDED BY ROUDABUSH & GALE DATED JUNE, 2017. TOPOGRAPHY IS �= 440.000 N ( AERIAL SURVEY PERFORMED BY VIRGINIA RESOURCE MAPPING DATED JANUARY i �� /I EXISTI DRAINA 48 I EX.DI V'310 312, R= O �J� Q SANITARY SEWER'MANHOI�E INLETS TYPICAL co ? TOP ELEV = 446.92 2006. TOPO FIELD VERIFIED BY COLLINS ENGINEERING IN JANUARY 2018. 1 I SCOTT R. COLLINS _ 3. MANAGED AND PRESERVED STEEP SLOPES ARE LOCATED ON THE PROPERTY. u DI EXISTING MH-MJH-1-4 4. 100 WPO STREAM BUFFER IS SHOWN. THE STREAM BUFFER SHOWN HEREON / / / i D \ Q U No. 35'791 � \ SHALL BE MANAGED IN ACCORDANCE WITH THE ALBEMARLE COUNTY WATER EX"" `� EX.DI PROTECTION ORDINANCE.�� `�Jox L E� � �OJ� CONC nJ O � - M EXISTI DRAINAGE \ 5� INLET PICAL) r �� -- 09 TMP: 07800-00-00-031 HO EX.DI EXISTI `C AND GUTTER 9� � _ � OWNER: GAHC4 CHARLOTTESVILLE EX. LONG TEf� FFERSON Q � �� ' VA MOB, LLC ARKWA TOE" EMOVED \V --- --- / ZONING: PLANNED DEVELOPMENT � o/ N35 00' 00.00"E i p / / TMP: 07800-00-00-020M5 / / \ ITHIN,T r5 A A OR THE V �51 82.078' �b� �� ACREAGE: 17. 8AC IXED COMMERCIAL OWNER: PRESIDIO PANTOPS, LLC / �� ��� OSED N ROAD /�► �// /� 4 / �s9° OQ00 , `�^ ;�^ DB/PG: 4818/286 rJ I� �i o ZONING: PLANNED DEVELOPMENT / PORTYON Q/F I�RB �ND UA A L ALONG Q / 0 0 TER JEFFER ON PAR ° �� 0 d MIXED COMMERCIAL � I � � � � / � OD ,� � 0 Q � i PE INVAY TO E REMOVED ACREAGE: 4.51 AC ` / I FOR APATIIN aV1PLEX Ef�R NCES� I — / oi�j DB/PG 5224/198 \ i I \ / c� p`L _ � w S INIG IN HARDWOOD; / `ti / 0 J �/ \ \ \ / �— — / �, \ / T E TY .) / \ �\ o III I ��II co Iow/// �w-1 \ i� / o ujLu 1 i!i/ I l I�IT =S & CCESS 1 I NT FOR SWM z II X o� o 00 5�76, PG. 490 I � �/— /-� I I \ C) �� � II � \ I I IR E T�'�IN� �� A EXI ING1/A OO I l �� / off\ ��NSION TO PROPER / / EXISTING DRAINAGE ��� ��� 7 Q EXISTING ACSA 16" DIP WATERLINE INLETS (TYPICAL / �o y / � 111 / / / / PO�ION OFOU B ANDGUARDRAIL�\ _ / v) �' / /,, / �/ I / / / /EE JEFF]=RHO PARKWAY TO BE MOVED A\� g ---- - = - / / / V z o IIl All- /// / /�/ //OFI I I �, / / / E A / -__ - /w N / // / / / �� / / / I FO AFAR ME T COMPLEX ENTRANCES V / / / w a / w o / N I I EXISTING CURB AND GUTTER ALONG PETER JEFFERSON I I \ PARKWAY TO BE REMOVED / \� 4= I _ / / I E I TING TREELINE WITHIN THIS AREA FOR THE / / // \\ �_ 132 8943 U of /� // / � -� � _ �6///IQ I \ PROPOSED ENTRANCE ROAD, / �g0// � — �� ���ij /// -L9 fi ^ / I MATCHLINE A - S E THIS SHEET �EASTING GRAVEL j —=ROA- TO BE REMOVED �� / — — — -- /i / \ \ EXISTIf� / - ' �'/ /�%/�/� % / I I I I I I I I I /I /� 1 \ \ ? I i _ _ -�\� _ — 4X i ,� j \ \\ C? / INLETS( T _ - i i / � � _ l_ —4'70� 7 L PORTION OF MEDIAN AND CUR TO �E / I REMOVED FOR NEW T N LANE _ _���� i `L ��o CC� 39 52�. 4 ///i�� I EXISTIN MANA p�_1 �, N63° 05�9:00"W_ \ O I I �, \ \ S PPP.ES (Tlf / � ,— - _ ' - - _420— Zz _ — I,/ �XI ING PIN /HARDWOOD �l �� / I / O. - I Lu TR E (TYP.)---- -- L 132 �7 — — J \74�48 '— v X�i/- -- o\ -- v _- EXISTING PRESERVED o - �� �/ / I / �— Lu SLOPES TO REMAIN (TYP) �, i /�/�� //� / / ^�\gl \ \\\ \ \ \ �r O - - / XIM �E LOCATION— /I'I� 'ACCESS EASEMENT— / WORELL LAND— �� IIO TMP: 07800 0 00020M1' \ \ Q M�: o7�ao--0o-o2oM6 l ��/ / % & EVELOPMENT V I I . I a I I / / / / / / �. — I / \ ER: \ �I; / / t \ O ER V1�ORREL L(�ND $rDEVECO�P�MENTS�OMPANY / I \ PREISI I PANTOPS,,LLCV I l�.ts. 574„PG.320 I III l / \ZONING: PLANNED DES ELQPM�T IXED-COMMERCIAL - _ / D.B. 881 PG. 290 / ACREA E. 29.63 AC Z Gy PLANN VELOP NT M COMM RC I I /� � \ i �C E: 22.4X D.B. 881, PG. 297 I I �3 DB[PG: 4069/267, 254�4/24�0�7/5 73/�18 I ��� / I v l �1 Ili v�o _ FACILITIES ACCESS / / / / \� \ \DBrPG. 5 /19 _ \ \\ \\\ \\ / / / I I I I / / / / \\ \\ \ — — - AS�MENTTOR SWM / / \\ v \\ \\VA \ / I I I / �� A VA —Lu �VA\�����— / \\XIST.ING TREE N I I I o I I I / \ \ \� — -- -- - W �� -- FACILITIES C-CES _ �� \ \ � I i. `\� \ _ --- �---------- 100-YEAR \ \ \\\ \ I �\ 8� — ---- w O AM BUFFER E I I / EASEMENT F R \� — \ \\\\\ �� \\\ J I I / "' I l I \ \\ — \\ �� —-------- --- ---- --- -- w REAM I I \ DB. 5276 PG. 4 0 \ �� \\ ��/ J 1 _ — \\ _� - I I I I EXISTING GRAVEL \ \ — �� /�`� �_ _ II F OD TO BE REMOVED�� ---y Un EXISTING PIN�fH \ \�� / \/ I I I I / / \ / _ \ \ �� _ TLu REES (TYPEIF )PLA — \ OO o _390— Z rJ C) —390 610.670' S cd - _C —SC _ —_ — EXISTINGPRIVA �C— — - - s70 - __--�' ao so v o 3eo RA(NAGE EASE IE T -- - ZX o 12 / \ Db.5 33, PG. 359' -- /// /� // � � �/� / / � � � / — _ EXISTING TRAIL�� TO REMAI ( IN F) � i ch �EE6 ft. rl z Lu 0 z Lu G Q z z Q J J � � z O > J O LU z � Lu 06 G � z Q O Q J � z � O U O z zuo O x Ln Lu Lu LL LL Lu r'1 Lu 2 H Q w w a � JOB NO. 172131 SCALE ill=60' SHEET NO. 2 EROSION & SEDIMENT CONTROL MEASURES: STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. STRUCTURAL PRACTICES USED IN THIS SECTION CONSIST OF THE FOLLOWING: 3.01 SAFETY FENCE: A PROTECTIVE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CONTROL MEASURE. TO PROHIBIT THE UNDESIRABLE USE OF AN EROSION CONTROL MEASURE BY THE PUBLIC. APPLICABLE TO ANY CONTROL MEASURE OR SERIES OF MEASURES WHICH CAN BE CONSIDERED UNSAFE BY VIRTUE OF POTENTIAL ACCESS BY THE PUBLIC. 3.02 CONSTRUCTION ENTRANCE: A STABILIZED PAVED CONSTRUCTION ENTRANCE WITH A WASH RACK LOCATED AT POINTS OF VEHICULAR INGRESS AND EGRESS ON A CONSTRUCTION SITE. TO REDUCE THE AMOUNT OF MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF. CONSTRUCTION ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC ROADWAYS. 3.05 SILT FENCE.• A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SYNTHETIC FILTER FABRIC STRETCHED ACROSS AND ATTACHED TO SUPPORTING POSTS AND ENTRENCHED, TO INTERCEPT AND DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUCTION OPERATIONS IN ORDER TO PREVENT SEDIMENT FROM LEAVING THE SITE, AND TO DECREASE THE VELOCITY OF SHEET FLOWS AND LOW- TO-MODERA TE LEVEL CHANNEL FLOWS. THE SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND MAINTAINED IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK (VESCH). 307 STORM DRAIN INLET PROTECTION: A SEDIMENT FILTER OR AN EXCAVATED IMPOUNDING AREA AROUND A STORM DRAIN DROP INLET OR CURB INLET. TO PREVENT SEDIMENT FROM ENTERING STORM DRAINAGE SYSTEMS PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA. INLET PROTECTION APPLIES WHERE STORM DRAIN INLETS ARE TO BE MADE OPERATIONAL BEFORE PERMANENT STABILIZATION OF THE CORRESPONDING DISTURBED DRAINAGE AREA. 3.09 TEMPORARY DIVERSION DIKE.• A TEMPORARY RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING DISTURBED AREA. TO DIVERT STORM RUNOFF FROM UPSLOPE DRAINAGE AREAS AWAY FROM UNPROTECTED DISTURBED AREAS AND SLOPES TO A STABILIZED OUTLET. TO DIVERT SEDIMENT -LADEN RUNOFF FROM A DISTURBED AREA TO A SEDIMENT -TRAPPING FACILITY SUCH AS A SEDIMENT TRAP OR SEDIMENT BASIN. USE WHEREVER STORMWATER RUNOFF MUST BE TEMPORARILY DIVERTED TO PROTECT DISTURBED AREAS AND SLOPES OR RETAIN SEDIMENT ON SITE DURING CONSTRUCTION. THESE STRUCTURES GENERALLY HAVE A LIFE EXPECTANCY OF 18 MONTHS OR LESS, WHICH CAN BE PROLONGED WITH PROPER MAINTENANCE. 312 DI VERSION: A CHANNEL CONSTRUCTED ACROSS A SLOPE WITH A SUPPORTING EARTHEN RIDGE ON THE LOWER SIDE. TO REDUCE SLOPE LENGTH AND TO INTERCEPT AND DIVERT STORMWATER RUNOFF TO STABILIZED OUTLETS AT NON -EROSIVE VELOCITIES. APPLIES WHERE RUNOFF FROM AREAS OF HIGHER ELEVATION MAY DAMAGE PROPERTY, CAUSE EROSION, OR INTERFERE WITH THE ESTABLISHMENT OF VEGETATION ON LOWER AREAS, WHERE SURFACE AND/OR SHALLOW SUBSURFACE FLOW IS DAMAGING SLOPING UPLAND, AND WHERE THE SLOPE LENGTH NEEDS TO BE REDUCED TO MINIMIZE SOIL L OSS. 313 TEMPORARY SEDIMENT TRAP: A TEMPORARY PONDING AREA FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT WITH A STONE OUTLET. TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL DISTURBED AREAS LONG ENOUGH TO ALLOW THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. USE BELOW DISTURBED AREAS WHERE THE TOTAL CON TR/BU TING DRAINAGE AREA /S LESS THAN 3 ACRES, WHERE THE SEDIMENT TRAP WILL BE USED NO LONGER THAN 18 MONTHS, AND IT MAY BE CONSTRUCTED EITHER INDEPENDENTLY OR IN CONJUNCTION WITH A TEMPORARY DIVERSION DIKE. 314 TEMPORARY SEDIMENT BASIN: A TEMPORARY BARRIER OR DAM WITH A CONTROLLED STORMWATER RELEASE STRUCTURE FORMED BY CONSTRUCTING AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. TO DETAIL SEDIMENT -LADEN RUNOFF FROM DISTURBED AREAS IN "WET" AND `DRY" STORAGE LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. APPLIES BELOW DISTURBED AREAS WHERE THE TOTAL CONTRIBUTING DRAINAGE AREA IS EQUAL TO OR GREATER THAN THREE ACRES. THERE MUST BE SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY FOR THE CONSTRUCTION OF A TEMPORARY IMPOUNDMENT. 318 OUTLET PROTECTION: STRUCTURALL Y LINED APRONS OR OTHER ACCEPTABLE ENERGY D/SS/PA TING DEVICES PLACED A T THE OUTLETS OF PIPES OR PA VED CHANNEL SECTIONS. TO PREVENT SCOUR AT STORMWATER OUTLETS, TO PROTECT THE OUTLET STRUCTURE, AND TO MINIMIZE THE POTENTIAL FOR DOWNSTREAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF CONCENTRATED STORMWA TER FLOWS. APPLICABLE TO THE OUTLETS OF ALL PIPES AND ENGINEERED CHANNEL SECTIONS. 319 RIPRAP: A PERMANENT, EROSION -RESISTANT GROUND COVER OF LARGE, LOOSE, ANGULAR STONE WITH FILTER FABRIC OR GRANULAR UNDERLINING. TO PROTECT THE SOIL FROM THE EROSIVE FORCES OF CONCENTRATED RUNOFF, SLOW THE VELOCITY OF CONCENTRATED RUNOFF WHILE ENHANCING THE PO TEN T/AL FOR INF/L TRA T/ON, AND TO STABILIZE SLOPES WITH SEEPAGE PROBLEMS, AND/OR NON -COHESIVE SOILS. USE WHEREVER SOIL AND WATER INTERFACE AND THE SOIL CONDITIONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETATIVE COVER, ETC., ARE SUCH THAT THE SOIL MAY ERODE UNDER THE DESIGN FLOW CONDITIONS. 3.20 ROCK CHECK DAMS. -- SMALL TEMPORARY STONE DAMS CONSTRUCTED ACROSS A SWALE OR DRAINAGE DITCH. TO REDUCE THE VELOCITY OF CONCENTRATED STORMWATER FLOWS, THEREBY REDUCING EROSION OF THE SWALE OR DITCH. THIS PRACTICE ALSO TRAPS SEDIMENT GENERATED FROM ADJACENT AREAS OR THE DITCH ITSELF, MAINLY BY PONDING OF THE STORMWATER RUNOFF. THIS PRACTICE, UTILIZING A COMBINATION OF STONE SIZES, IS LIMITED TO USE IN SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS. 331 TEMPORARY SEEDING. THE ESTABLISHMENT OF A TEMPORARY VEGETATIVE COVER ON DISTURBED AREAS BY SEEDING WITH APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND RUNOFF TO DOWNSTREAM OR OFF -SITE AREAS, AND TO PROVIDE PROTECTION TO BARE SOILS EXPOSED DURING CONSTRUCTION UNTIL PERMANENT VEGETATION OR OTHER EROSION CONTROL MEASURES CAN BE ESTABLISHED. 332 PERMANENT STABILIZATION: THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY PLANTING SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS. TO PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO SITE CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT MATERIALS. TO IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF CONSTRUCTION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER. 335 MULCHING: APPLICATION OF PLANT RESIDUES OR OTHER SUITABLE MATERIALS TO THE SOIL SURFACE. TO PREVENT EROSION BY PROTECTING THE SOIL SURFACE FROM RAINDROP IMPACT AND REDUCING THE VELOCITY OF OVERLAND FLOW. TO FOSTER THE GROWTH OF VEGETATION BY INCREASING AVAILABLE MOISTURE AND PROVIDING INSULATION AGAINST EXTREME HEAT AND COLD. AREAS WHICH HAVE BEEN PERMANENTLY SEEDED SHOULD BE MULCHED IMMEDIATELY FOLLOWING SEEDING. AREAS WHICH CANNOT BE SEEDED BECAUSE OF THE SEASON SHOULD BE MULCHED USING ORGANIC MULCH. MULCH MAY BE USED TOGETHER WITH PLANTINGS OF TREES, SHRUBS, OR CERTAIN GROUND COVERS WHICH DO NOT PROVIDE ADEQUATE SOIL STABILIZATION BY THEMSELVES, CAN BE USED IN CONJUNCTION WITH TEMPORARY SEEDING. 337 TREES, SHRUBS. VINES & GROUND COVERS: STABILIZING DISTURBED AREAS BY ESTABLISHING VEGETATIVE COVER WITH TREES, SHRUBS, VINES, OR GROUND COVERS. TO AID IN STABILIZING SOIL /N AREAS WHERE VEGETATION OVER THAN TURF /S PREFERRED, TO PROVIDE FOOD AND SHELTER FOR WILDLIFE WHERE WILDLIFE HABITAT /S DESIRABLE. APPLIES /N AREAS WHERE TURF ESTABLISHMENT /S DIFFICULT, ON STEEP OR ROCKY SLOPES WHERE MOWING /S NOT FEASIBLE, WHERE ORNAMENTALS ARE DESIRABLE FOR LANDSCAPING PURPOSES, AND WHERE WOODY PLANTS ARE DESIRABLE FOR SOIL CONSERVATION, OR TO ESTABLISH WILDLIFE HABITAT. 3.38 TREE PRESERVATION AND PROTECTION: PROTECTION OF DESIRABLE TREES FROM MECHANICAL OR OTHER INJURY DURING LAND DISTURBING AND CONSTRUCTION ACTIVITY. TO ENSURE THE SURVIVAL OF DESIRABLE TREES WHERE THEY WILL BE EFFECTIVE FOR EROSION AND SEDIMENT CONTROL, WATERSHED PROTECTION, LANDSCAPE BEAUTIFICATION DUST AND POLLUTION CONTROL NOISE REDUCTION SHADE AND OTHER ENVIRONMENTAL BENEFITS WHILE THE LAND IS BEING CONVERTED FROM FOREST TO URBAN -TYPE USES. APPLIES IN TREE -INHABITED AREAS SUBJECT TO LAND DISTURBING ACTIVITIES. 339 DUST CONTROL: REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING DEMOLITION AND CONSTRUCTION ACTIVITIES. TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS, TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE. DUST CONTROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH. EROSION CONTROL * HANDBIOOK SEROPOCIFCATIONMENT NUMBERNTROL LEGEND * ROADS STB I I I I STRAW BAIL BARRIER 3.04 DD D V TEMPORARY DIVERSION DIKE 3.09 ST t(%° o'BM*§ TEMPORARY SEDIMENT TRAP 3.13 (SB) ® SEDIMENT BASIN 3.14 0INLET 0 PROTECTION 3.07 SF X X X SIL T FENCE 3.05 &c� oo 0nn CONSTRUCTION ENTRANCE 3.02 CD ' CHECK DAM 3.20 FD TEMPORARY FILL DIVERSION 3.10 D V DIVERSION 5.12 PS PERMANENT SEEDING S &_ TO --&- TOPSOILING TO ClP CULVERT INLET PROTECTION DC DC DUST CONTROL 3.32 3.30 zoo 3.08 200 240.55 J. 0 TSD TEMPORARY SLOPE DRAIN 3.15 SA SAFETY FENCE 3.01 RW TEMPORARY RIGHT -OF- WAY 3.11 pp,DIVERSION EROSION CONTROL NOTES ES-1: UNLESS OTHERWISE INDICATED, ALL VEGETA TI VE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VT 625- 02- 00 EROSION AND SEDIMENT CONTROL REGULATIONS. ES-2: THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION. ES-J.-ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS THE FIRST STEP IN CLEARING. ES-4: A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE MAINTAINED ON THE SI TE A T ALL TIMES. ES-5: PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED ON THESE PLANS (INCLUDING BUT NOT LIMITED TO, OFF -SITE BORROW OR WASTE AREAS), THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY. ES-6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY. ES-7.-ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED. ES-8.-DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED WATER FILTERING DEVICE. ES-9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY. General construction notes for Erosion and Sediment Control plans 1. The plan approving authority must be notified one week prior to the re -construction P PP g y P P conference, one week prior to the commencement of land disturbing activity, and one week prior to the final inspection. 2. All erosion and sediment control measures will be constructed and maintained according to minimum standards and specifications of the Virginia Erosion and Sediment Control Handbook and Virginia Regulations VR 625-02-00 Erosion and Sediment Control Regulations. 3. All erosion and sediment control measures are to be placed prior to or as the first step in clearing. 4. A copy of the approved erosion and sediment control plan shall be maintained on the site at all times. 5. Prior to commencing land disturbing activities in areas other than indicated on these plans (including, but not limited to, off -site borrow or waste areas), the contractor shall submit a supplementary erosion control plan to the owner for review and approval by the plan approving authority. 6. The contractor is responsible for installation of any additional erosion control measures necessary to prevent erosion and sedimentation as determined by the plan approving authority. 7. All disturbed areas are to drain to approved sediment control measures at all times during land disturbing activities and during site development until final stabilization is achieved. 8. During dewatering operations, water will be pumped into an approved filtering device. 9. The contractor shall inspect all erosion control measures periodically and after each runoff - producing rainfall event. Any necessary repairs or cleanup to maintain the effectiveness of the erosion control devices shall be made immediately. 10. All fill material to be taken from an approved, designated borrow area. 11. All waste materials shall be taken to an approved waste area. Earth fill shall be inert materials only, free of roots, stumps, wood, rubbish, and other debris. 12. Borrow or waste areas are to be reclaimed within 7 days of completion per Zoning Ordinance section 5.1.28. 13. All inert materials shall be transported in compliance with section 13-301 of the Code of Albemarle. 14. Borrow, fill or waste activity involving industrial -type power equipment shall be limited to the hours of 7:00am to 9:00pm. 15. Borrow, fill or waste activity shall be conducted in a safe manner than maintains lateral support, or order to minimize any hazard to persons, physical damage to adjacent land and improvements, and damage to any public street because o slides, sinking, or collapse. 16. The developer shall reserve the right to install, maintain, remove or convert to permanent stormwater management facilities where applicable all erosion control measures required by this plan regardless of the sale of any lot, unit, building or other portion of the property- 17. Temporary stabilization shall be temporary seeding and mulching. Seeding is to be at 75 lbs/acre, and in the months of September to February to consist a 50150 mix of Annual Ryegrass and Cereal Winter Rye, or in March and April to consist of Annual Rye, or May through August to consist of German Millet. Straw mulch is to be applied at 801bs/100sf. Alternatives are subject to approved by the County erosion control inspector. 18. Permanent stabilization shall be lime and fertilizer, permanent seeding, and mulch - Agricultural Agricultural grade limestone shall be applied at 90lbs/1000sf, incorporated into the top 4-6 inches of soil. Fertilizer shall be applied at 10001bs/acre and consist of a 10-20-10 nutrient mix. Permanent seeding shall be applied at 180lbs/acre and consist of 95% Kentucky 31 or Tall Fescue and 0-5% Perennial Ryegrass or Kentucky Bluegrass. Straw mulch is to be applied at 801bs/100sf. Alternatives are subject to approved by the County erosion control inspector. 19. Maintenance: All measures are to be inspected weekly and after each rainfall. Any damage or clogging to structural measures is to be repair immediately. Silt traps are to be cleaned when 50% of the wet storage volume is filled with sediment. All seeded areas are to be reseeded when necessary to achieve a good stand of grass. Silt fence and diversion dykes which are collecting sediment to half their height must be cleaned and repaired immediately. 20. All temporary erosion and sediment control measures are to be removed within 30 days of final site stabilization, when measures are no longer needed, subject to approval by the County erosion control inspector. 21. This plan shall be void if the owner does not obtain a permit within 1 year of the date of approval. (Water Protection Ordinance section 17-204G.) 22. Permanent vegetation shall be installed on all denuded areas within nine (9) months after the date the land disturbing activity commenced. (Water Protection Ordinance section 17- 207B) TABLE 3.31-A LIMING REQUIREMENTS FOR TEMPORARY SITES Recommended Application RH Test of Agriculiural Limestone below 4.2 3 tons per acre 4.2 to 5.2 2 tons per acre 5.2 to 6 1 ton per acre Source: 'Va. DSWC GENERAL SLOPE (3:1 OR LESS) KENTUCKY 31 FESCUE RED TOP GRASS SEASONAL NURSE CROP EXISTING CULVERT CUL VERT DROP INLET & STRUCTURE NO. CURB CURB & GUTTER PROPOSED PA VEMEN T EC-3A DITCH DEPTH OF EC- 3A DITCH EC-2 DI TCH DEPTH OF EC-2 DITCH EARTH DITCH DRl VEWA Y CUL VER T BENCH MARK CLEARING LIMITS VDOT STANDARD STOP SIGN EXISTING CONTOUR PROPOSED CONTOUR PROPOSED SPOT ELEVATION TBC DENOTES TOP/BACK OF CURB T/B DENOTES TOP OF BOX SEASONAL NURSE CROP FEBRUARY 16 THROUGH APRIL ANNUAL RYE MAY 1 THROUGH AUGUST 15 FOXTAIL MILLET AUGUST 16 THROUGH OCTOBER ANNUAL RYE NOVEMBER THROUGH FEBRUARY 15 WINTER RYE NOILS: 1. _IME A\L FERTILIZER NEEDS SHALL BE DETERMINED BY SOIL TESTS AN' APPLIED IN ACCORDANCE WITH VESCH STD. 3.32. 2. SEEDINGS TO BE MULCHED IMMEDIATELY UPON COMPLETION OF SEED APPLICATION, IN ACCORDANCE W/ VESCH STD 3.35. PERMANENT SEEDING SCHEDULE TOTAL LBS PER ACRE 128 LBS 2 LBS 20 LBS 150 LBS '�,� NO SCALE (STD. & SPEC. 3.32 OF VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK, 3RD ED.) TABLE 3.31-B ACCEPTABLE TEMPORARY SEEDING PLANT MATERIALS "QUICK REFERENCE FOR ALL REGIONS' Rate Planting Dates Specie Obs. acre Sept. 1 - Feb. 15 50/50 Mix of Annual Ryegrass (II multi-florum) & 50 - 100 Cereal (Winter) Rye (Secale cerea€e) Feb- 16 - Apr. 30 Annual Ryegrass 60 - 100 (L.olium multi-Ilorurn) May 1 - Aug 31 German Millet 50 (Setaria italica) Source: Va- DSWC DESCRIPTION OF EROSION & SEDIMENT COEN CONTROL MEASURES: ASURES: NTROL MEASURES: IT IS ANTICIPATED TO USE CONSTRUCTION ENTRANCES, DIVERSION DIKES, EXISTING SEDIMENT BASINS, AND SILT FENCES WILL BE INSTALLED TO CONTROL SURFACE DRAINAGE. TEMPORARY SEEDING WILL BE USED IMMEDIATELY FOLLOWING ALL LAND DISTURBANCE ACTIVITIES. TEMPORARY STOCKPILE AREAS WILL BE MAINTAINED FROM TOPSOIL THAT WILL BE STRIPPED FROM AREAS TO BE GRADED AND STORED FOR LATER SPREADING. STOCKPILE LOCATIONS SHALL BE ON SITE AND SHALL BE STABILIZED WITH A TEMPORARY VEGETATIVE COVER. PERMANENT SEEDING WILL BE PERFORMED FOR ALL AREAS WHICH WILL NO LONGER BE EXCAVATED AND WHERE CONSTRUCTION ACTIVITIES HAVE CEASED. PERMANENT SEEDING SHALL ALSO BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR A YEAR OR MORE. SELECTION OF SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED. TEMPORARY SEEDING WILL BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR MORE THAN SEVEN DAYS. THESE AREAS SHALL BE SEEDED WITH FAST GERMINA TING VEGETA TION IMMEDIA TEL Y FOLLOWING GRADING OF THOSE AREAS. SELECTION OF SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED. CONSTRUCTION ENTRANCE.• A STABILIZED PAVED CONSTRUCTION ENTRANCE WITH A WASH RACK LOCATED AT POINTS OF VEHICULAR INGRESS AND EGRESS ON A CONSTRUCTION SITE. TO REDUCE THE AMOUNT OF MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF. CONSTRUCTION ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC ROADWAYS. SILT FENCE. A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SYNTHETIC FILTER FABRIC STRETCHED ACROSS AND ATTACHED TO SUPPORTING POSTS AND ENTRENCHED. TO INTERCEPT AND DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUCTION OPERATIONS IN ORDER TO PREVENT SEDIMENT FROM LEAVING THE SITE. TO DECREASE THE VELOCITY OF SHEET FLOWS AND LOW -TO -MODERATE LEVEL CHANNEL FLOWS. THE SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND MAINTAINED IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK (VESCH). PERMANENT STABILIZATION: THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY PLANTING SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS. TO PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO SITE CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT MATERIALS. TO IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF CONSTRUCTION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER. TEMPORARY SEEDING: THE ESTABLISHMENT OF A TEMPORARY VEGETATIVE COVER ON DISTURBED AREAS BY SEEDING WITH APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND RUNOFF TO DOWNSTREAM OR OFF -SITE AREAS, AND TO PROVIDE PROTECTION TO BARE SOILS EXPOSED DURING CONSTRUCTION UNTIL PERMANENT VEGETATION OR OTHER EROSION CONTROL MEASURES CAN BE ESTABLISHED. DUST CONTROL: REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND CONSTRUCTION ACTIVITIES. TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS, TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE. DUST CONTROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH. TEMPORARY DIVERSION DIKE: A RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING DISTURBED AREA WHICH DIVERTS OFF -SITE RUNOFF AWAY FROM UNPROTECTED SLOPES AND TO A STABILIZED OUTLET OR TO DIVERT SEDIMENT -LADEN RUNOFF TO A SEDIMENT TRAPPING STRUCTURE. MAXIMUM EFFECTIVE LIVE IS 18 MONTHS. ROCK CHECK DAMS: SMALL, TEMPORARY STONE DAMS CONSTRUCTED ACROSS A DRAINAGE DITCH TO REDUCE THE VELOCITY OF CONCENTRATED FLOWS, REDUCING EROSION OF THE SWALE OR DITCH. LIMITED TO USE IN SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS; SHOULD NOT BE USED IN LIVE STREAMS. STORM DRAIN INLET PROTECTION: THE INSTALLATION OF VARIOUS KINDS OF SEDIMENT TRAPPING MEASURES AROUND DROP INLETS OR CURB INLET STRUCTURES PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA; LIMITED TO DRAINAGE AREAS NOT EXCEEDING ONE ACRE, AND NOT INTENDED TO CONTROL LARGE, CONCENTRATED STORMWATER FLOWS. TEMPORARY SEDIMENT TRAP: A SMALL PONDING AREA, FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT WITH A STONE OUTLET ACROSS A DRAINAGE SWALE, TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL DISTURBED AREAS FOR ENOUGH TIME TO ALLOW MOST TO THE SUSPENDED SOLIDS TO SETTLE OUT. MAXIMUM EFFECTIVE LIFE IS 18 MONTHS. TEMPORARY SEDIMENT BASIN: A TEMPORARY BARRIER OR DAM WITH CONTROLLED STORMWATER RELEASE STRUCTURES WHICH IS FORMED BY CONSTRUCTING AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. IT IS USED TO DETAIN SEDIMENT -LADEN RUNOFF FROM DRAINAGE AREAS 3 ACRES OR GREATER FOR ENOUGH TIME TO ALLOW MOST OF THE SUSPENDED SOLIDS TO SETTLE OUT. IT CAN BE CONSTRUCTED ONLY WHERE THERE IS SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY MAXIMUM EFFECTIVE LIFE IS 18 MONTHS UNLESS DESIGNED AS A PERMANENT POND BY A QUALIFIED PROFESSIONAL. OUTLET PROTECTION. THE INSTALLATION OF RIPRAP CHANNEL SECTIONS AND/OR STILLING BASINS BELOW STORM DRAIN OUTLETS TO REDUCE EROSION AND UNDER -CUTTING FROM SCOURING AT OUTLETS AND TO REDUCE FLOW VEL OCI TIES BEFORE STORMWA TER ENTERS RECEIVING CHANNELS BELOW THESE OUTLETS. CULVERT INLET PROTECTION: A SEDIMENT FILTER LOCATED AT THE INLET TO STORM SEWER CULVERTS WHICH PREVENTS SEDIMENT FROM ENTERING, ACCUMULATING IN AND BEING TRANSFERRED BY THE CULVERT. IT ALSO PROVIDES EROSION CONTROL AT CULVERTS DURING THE PHASE OF A PROJECT WHERE ELEVATIONS AND DRAINAGE PATTERNS ARE CHANGING, CAUSING ORIGINAL CONTROL MEASURES TO BE INEFFECTIVE. SAFETY FENCE: A PROTECTIVE BARRIER INSTALLED TO PROHIBIT UNDESIRABLE USE OF AN EROSION CONTROL MEASURE. PERMANENT STABILIZA TION: PERMANENT SEEDING WILL BE APPLIED TO ALL DISTURBED AREAS AS PER THE PERMANENT STABILIZATION OF THIS EROSION & SEDIMENT CONTROL NARRATIVE AFTER CONSTRUCTION IS COMPLETED, ALL DISTURBED AREAS OF THE SITE WILL BE LIMED, FERTILIZED, AND SEEDED AS PER CURRENT VDOT STANDARDS. THIS SHALL CONSIST OF THE FOLLOWING: TOP SOIL - 2 " DEP TH LIME - 2 TONS/ACRE FERTILIZER - 600 LBS/ACRE OF 15-30-15 SEED - ERNST 5311 CONSERVATION SEED MIX - ERNMX-114 (45 LBS/ACRE PENNLAWN CREEPING RED FESCUE, 37.5 LBS/ACRE ARGILS KENTUCKY BLUEGRASS, 37.5 LBS/ACRE PARK KENTUCKY BLUEGRASS, 15 LBS/ACRE ANNUAL RYEGRASS & 15 LBS/ACRE PLEASURE PERENNIAL AFTER THESE AREAS ARE STABILIZED THEY WILL BE MOWED AND MAINTAINED ON A REGULAR BASIS. MAINTENANCE IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT RAINFALL. SPECIFIC ATTENTION WILL BE GIVEN TO THE FOLLOWING ITEMS.• A. SEDIMENT BASINS AND/OR TRAPS WILL BE CLEANED AND MAINTAINED IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK. B. ALL GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP THAT WILL PREVENT PROPER DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT, THE GRAVEL WILL BE REMOVED AND CLEANED, OR IT WILL BE REPLACED. C. ALL SlL T FENCE BARRIERS WILL BE CHECKED REGULARLY FOR UNDERMINING OR DETERIORATION OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHED HALF WAY TO THE TOP OF THE BARRIER. D. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED. EROSION CONTROL NOTES & NARRATIVE CYH 0 '6� THE PURPOSE OF THIS LAND DISTURBING ACTIVITY IS TO CREATE THE MARTHA JEFFERSON HOSPITAL APARTMENTS PROJECT. r��No. PURPOSE � I THE TOTAL AREA TO BE DISTURBED WITH THIS PLAN IS 17.17 ACRES. � EXISTING SITE CONDITIONS. T R. COLLINS'� THIS SITE IS CURRENTLY A MIXTURE OF WOODS AND GRASS AND DRAINS TO EXISTING WATERWAYS LOCATED TO THE EAST, WEST, AND SOUTH. AN EXISTING GRAVEL ROAD EXISTS ON -SITE, EXISTING PRESERVED STEEP SLOPES EXIST ON -SITE. 35791 ,� ADJACENT AREAS: THIS SITE IS BORDERED TO THE NORTH BY PETER JEFFERSON PARKWAY. TO THE SOUTH EXISTS THE RIVANNA RIVER. AN EXISTING COMMERCIAL PROPERTY EXISTS TO THE WEST. A CURRENTLY VACANT MIXED -USE COMMERCIAL LOT EXISTS TO THE EAST �O�,_ ��� OFFSITE LAND DISTURBANCE. • IONAL VGA NO CONSTRUCTION ACTIVITIES ARE PROPOSED OUTSIDE OF THE LIMITS OF DISTURBANCE. ALL OFFSITE WORK SHALL BE CONFINED TO PUBLIC RIGHT-OF-WAY AND EASEMENTS. CRITICAL AREAS: CARE SHALL BE TAKEN TO PREVENT CONSTRUCTION RUNOFF FROM ENTERING THE EXIS77NG PRESERVED STEEP SLOPES, RIVANNA RIVER AND ADJACENT PROPERTIES. SOILS: A SOILS MAP IS INCORPORATED INTO THE PHASE I EROSION CONTROL PLAN WITH SOILS DATA INCLUDED WITH THIS NARRATIVE. SEQUENCE OF CONSTRUCTION: 1. N077FY ALBEMARLE COUNTY TO SCHEDULE A PRE- CONS TRUC T70N MEETING AS REQUIRED. 2. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONSTRUCTION PROCESS WITHOUT THE APPROVAL FROM THE INSPECTOR ON THE PROJECT. J. INSTALL THE PAVED CONSTRUCTION ENTRANCE WITH WASH AREA AS SHOWN ON THE PLANS. CONSTRUC77ON ENTRANCES TO BE INSTALLED WHERE CONSTRUCTION VEHICLE ROUTES INTERSECT PAVED PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY (VEHICULAR) TRACKING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING AND TRANSPORTING TO A SEDIMENT CONTROL DISPOSAL AREA. STREET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER 4. INSTALL THE INITIAL CONSTRUCTION MEASURES AS SHOWN ON 7HE PHASE I EROSION CONTROL SHEET. THIS INCLUDES (1) CONSTRUCTION ENTRANCE, (2) SEDIMENT BASINS, (2) SEDIMENT TRAPS, CONSTRUCTION ROAD STABILIZATION, SILT FENCE, AND DIVERSION DIKES MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH ANY LAND DISTURBANCE AC77WTY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. 6. ONCE THE PERIMETER EROSION CONTROL MEASURES HAVE BEEN INSTALLED AS SHOWN ON THE PHASE l EROSION CONTROL U) PHASE PLAN, CONTRACTOR SHALL INSTALL ANY REMAINING ESC PHASE I CONSTRUCTION MEASURES AS SHOWN ON THE z EROSION CONTROL SHEET, INCLUSIVE OR TEMPORARY SEEDING & DUST CONTROL AS NEEDED. O Q 7. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY POR77ON OF 7HE SITE. TEMPORARY SOIL STABILIZA77ON SHALL BE APPLIED WITHIN I SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR O � LONGER THAN 30 DAYS. PERMANENT STABILIZA77ON SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR M CO Z5 MORE 7HAN ONE YEAR. w 8. AFTER INSTALLATION OF ALL OF 774E PHASE l ESC MEASURES, 774E CONTRACTOR CAN CLEAR THE SITE. (� 0 w 9. ONCE ESC PHASE l IS COMPLETE THE CONTRACTOR CAN PROCEED TO ESC PHASE ll. THE CONTRACTOR SHALL ENSURE THE r/ z Q PERIMETER DIVERSIONS MAINTAIN POS177VE GRADES AT ALL TIMES & DISCHARGE INTO THEIR RESPEC77VE EROSION & M O SEDIMENT CONTROL TRAPPING DEVICES �n z 10. CONTRACTOR SHALL INSTALL THE ESC PHASE // CONSTRUCTION MEASURES AS SHOWN ON THE EROSION CONTROL SHEET, '-' INCLUSIVE OR TEMPORARY SEEDING & DUST CONTROL AS NEEDED. PERIMETER MEASURES INTENDED TO 7RAP SEDIMENT w SHALL BE CONSTRUCTED AS A FIRST STEP W1174 ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. 11. DURING THIS ESC PHASE ll, ROUGH GRADING OPERA77ONS CAN BEGIN. Ce 12. ONCE 774E S17F HAS BEEN ROUGH GRADED TO THE POINT WHERE SEDIMENT TRAP #2 CAN NO LONGER REMAIN, THE CONTRACTOR CAN FILL THIS TRAP. THE REMOVAL OF SEDIMENT TRAP #2 SHALL NOT OCCUR PRIOR TO 774E APPROVAL OF THE COUNTY INSPECTOR. DEWATERING OF SEDIMENT TRAP #2 SHALL BE COMPLETED IN ACCORDANCE WITH MINIMUM VESCH SPECIFICATIONS. 13. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED W774IN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. 10. THE CONTRACTOR SHALL THEN PROCEED TO ESC PHASE Ill. CONTRACTOR SHALL INSTALL THE ESC PHASE 111 CONS7RUC770N MEASURES AS SHOWN ON THE EROSION CONTROL SHEET, INCLUSIVE OR TEMPORARY SEEDING & DUST CONTROL AS NEEDED. PERIMETER MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNC7ONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. 11. THE CONTRACTOR SHALL COMPLETE THE ROUGH GRADING OF THE SITE IN ESC PHASE Ill. 12. FOLLOWING THIS THE CONTRACTOR SHALL FINE GRADE THE SITE AND INSTALL THE UTILITIES, CURB & GUTTER, SIDEWALK, BUILDING & PARKING PADS AND REMAINING INFRASTRUCTURE. 13. INLET PR07ECT70N SHALL BE INSTALLED ON ALL STORM SEWER INLETS AND YARD DRAINS IMMEDIATELY FOLLOWING THEIR INSTALLATIONS. ANY DRAINAGE SYSTEM FOUND TO BE CLOGGED OR CONTAINING SEDIMENT DURING CONSTRUCTION SHALL BE CLEANED PRIOR TO THE COMPLETION OF THE PROJECT. 14. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF 7HE SITE. TEMPORARY SOIL STABILIZA77ON SHALL BE APPLIED WITHIN CD SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR w N LONGER THAN 30 DAYS. PERMANENT STABILIZA77ON SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR Q t ) MORE THAN ONE YEAR. p ­4 15. THE PERIMETER DIVERSIONS, SEDIMENT TRAP #1, SEDIMENT BASIN #1 AND SEDIMENT BASIN #2 SHALL REMAIN FUNCTIONAL "T AS LONG AS POSSIBLE. THESE SEDIMENT 7RAPPING DEVICES SHALL NOT BE REMOVED PRIOR TO THE APPROVAL OF THE COUNTY INSPECTOR. 16. ONCE THE SITE's CONSTRUC77ON IS COMPLETE, AND THE PROJECT IS FULLY STABILIZED, SEDIMENT TRAP #1 CAN BE REMOVED, SEDIMENT BASIN #1 CAN BE CONVERTED TO A PERMANENT SWM FACILITY, SEDIMENT BASIN #2 CAN BE CONVERTED TO A PERMANENT SWM FACILITY AND THESE FACILITIES' PER/METER DIVERSIONS CAN BE REMOVED. DEWATERING OF THESE FACIL177ES SHALL BE COMPLETED IN ACCORDANCE WITH MINIMUM VESCH SPECIFICATIONS. L9 17. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONS7RUC770N PROCESS WITHOUT THE APPROVAL OF THE INSPECTOR ON THE PROJECT. 18. MAINTAIN ALL EROSION CON77?OL MEASURES AS SPECIFIED IN THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, REMOVING ONLY WHEN APPROVED BY 774E LOCAL PROGRAM ADMINISTRATOR IN ACCORDANCE WITH 774E VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. 19. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER FINAL SITE STABILIZATION OR AFTER 774E TEMPORARY MEASURES ARE NO LONGER NEEDED UNLESS 0774ERWISE AUTHORIZED BY THE LOCAL PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT AND 774E DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION. 20.ONCE 774E S17F IS STABILIZED AND THE INSPECTOR HAS GIVEN APPROVAL, THE CONTRACTOR CAN REMOVE 774E REMAINING IIIIIIIIIIIIIIIIIII EROSION CONTROL MEASURES NO ITEM SHALL BE REMOVED UNLESS THE UPSTREAM AREAS ARE STABILIZED AND THE INSPECTOR GIVES PERMISSION. 01 SOIL DESCRIPTION 72C3 - RABUN CLAY - SEVERELY ERODED, 77 TO 157 SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES. MODERATE TO RAPID RUNOFF, WITH MODERATE PERMEABILITY. 72D3 - RABUN CLAY - SEVERELY ERODED, 159 TO 259 SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES. MODERATE TO RAPID RUNOFF, WITH MODERATE PERMEABILITY. 73D - RABUN VERY STONY CLAY LOAM - SEVERELY ERODED, 157 TO 257 SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES. MODERATE TO RAPID RUNOFF, WITH MODERATE PERMEABILITY. 73E - RABUN VERY STONY CLAY LOAM - SEVERELY ERODED, 25Z TO 45Z SLOPES. THESE IIIIIIIIIIIIIIIIIII DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES. MODERATE TO RAPID RUNOFF, WITH MODERATE PERMEABILITY. W - WA TER L9 TEMPORARY SEEDING: ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR EXTENDED PERIODS OF TIME SHALL BE SEEDED WITH FAST GERMINA TING TEMPORARY VEGETA TION IMMEDIA TEL Y FOLLOWING GRADING. SELECTION OF THE SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR AND WILL BE APPLIED TO DISTURBED ARES THAT WILL NOT BE BROUGHT TO FINAL GRADE WITHIN 30 DA YS. PLANTS SHOULD BE SELECTED APPROPRIATE TO THE SEASON AND SITE CONDITIONS FROM TABLES 3.31B AND 3.31C. NOTE THAT TABLE 3.31B PRESENTS PLANTS WHICH CAN BE USED WITHOUT EXTENSIVE EVALUATION OF SITE CONDITIONS; TABLE 3.31 C PRESENTS MORE in IN-DEPTH INFORMATION ON THE PLANT MATERIALS. TO CONTROL EROSION ON BARE SOIL SURFACES, PLANTS MUST BE ABLE TO GERMINATE AND GROW. SEEDBED PREPARATION IS ESSENTIAL. AN EVALUATION SHOULD BE CONDUCTED TO DETERMINE IF LIME IS NECESSARY FOR Z TEMPORARY SEEDING. TABLE 3.31A MAY BE USED TO DETERMINE THE ACTUAL NEED ALONG WITH SUGGESTED APPLICATION RATES: FERTILIZER SHALL BE APPLIED AS 600 LBS/ACRE OF 10-20-10 (14 LBS/1, 000 SQ. FT.) OR IIIIIIIIIIIIIIIIIII EQUIVALENT NUTRIENTS. LIME AND FERTILIZER SHALL BE INCORPORATED INTO THE TOP 2 TO 4 INCHES OF THE SOIL IF POSSIBLE. IF THE AREA HAS BEEN RECENTLY LOOSENED OR DISTURBED, NO FURTHER ROUGHENING IS mi REQUIRED. WHEN THE AREA IS COMPACTED, CRUSTED, OR HARDENED, THE SOIL SHALL BE LOOSENED BY DISCING, RAKING, HARROWING, OR OTHER ACCEPTABLE MEANS. TRACKING WITH BULLDOZER CLEATS IS MOST EFFECTIVE ON SANDY SOILS. THIS PRACTICE OFTEN CAUSES mml UNDUE COMPACTION OF THE SOIL SURFACE, ESPECIALLY IN CLAYEY SOILS, AND DOES NOT AlD PLANT GROWTH AS EFFECTIVELY AS OTHER METHODS OF SURFACE ROUGHENING. SEED SHALL BE EVENLY APPLIED WITH A BROADCAST SEEDER, DRILL, CUL T/PACKER SEEDER 0 OR HYDROSEEDER. SMALL GRAINS SHALL BE PLANTED NO MORE THAN 1J INCHES DEEP. SMALL SEEDS, SUCH AS KENTUCKY BLUEGRASS, SHOULD BE PLANTED NO MORE THAN 4 INCH DEEP. OTHER GRASSES AND LEGUMES SHOULD BE PLANTED FROM 4 INCH TO � DEEP. SEEDINGS MADE IN FALL FOR WINTER COVER AND DURING HOT AND DRY SUMMER MONTHS SHALL BE MULCHED ACCORDING TO MULCHING, STD. & SPEC. 3.35, EXCEPT THAT HYDROMULCHES (FIBER MULCH) WILL NOT BE CONSIDERED ADEQUATE. STRAW MULCH SHOULD BE USED DURING THESE PERIODS. AREAS WHICH FAIL TO ESTABLISH VEGETATIVE COVER ADEQUATE TO PREVENT RILL EROSION WILL BE RE -SEEDED AS SOON AS SUCH AREAS ARE IDENTIFIED. STORM WA TER RUN-OFF CONSIDERATIONS. STORMWATER MANAGEMENT: THE STORMWATER RUNOFF FROM THIS PROJECT DRAINS TEMPORARILY TO THE PROPOSED SEDIMENT BASIN & SEDIMENT TRAP. THE SEDIMENT BASIN WILL BE CONVERTED TO A PERMANENT STORM WA TER MANAGEMENT FACILITY AND THE SEDIMENT TRAP WILL BE REMOVED AFTER THE DEVELOPMENT OF THE MARTHA JEFFERSON APARTMENTS PROJECT. Ir- 00 M N M I N O N N Q > LLB J_ w 0 GlIf = C) LLB F____ D U) LU LULU I..L U) W GlIf C) N r1 z LU G 0 z LU Q z Q 0- C11- V) I V) z LU LL Q C11- J Q II 0- V) 0 = z 0 V) LU LL LU r"1 Q = U QU W Q z 0 z 0 U z W 0 LU U) 016 z ,0 V / 0 W LU 2: LU w 0- U) JOB NO. 172131 SCALE AS NOTED SHEET NO. 3 I Project MJH Apartments - Stockpile Area Plan Sheet No. Designer AM L, PE Sheet 1 of 2 APPROVED Culvert #1 Rev. Date Date 1 4/3/18 AHW Controls STATION: HYDROLOGIC& DATA 100 yr. Flood plain elev. Design AHW depth elev. Structures elev. freq. TWelev. Culvert #1: DA=2.07 ac., Cw=0.45, Tc=9.5 min., 2-year Q=3.96 cfs, 10-year Q=5.31 cfs - = Shoulder = eleV. 414.00 = CL elev. 414.00 DISCHARGES USED RISK ASSESSM ENT ADT Skew ° Cover n Q 2 = 3.96 CFS Detours Available Length Q 10 = 5.31 CFS Overtopping Stage Q = CFS Flood Plain Management Inv. El. 412.00 So= 4.00% Inv. El. 410.00 Q = CFS Criteria and Significant Impact Orig. Gr. Elev. L= Orig. Gr. Elev. Q = CFS HEADWATER COMPUTATIONS CONT. OUTLET CULVERT TYPE & SIZE Q Q/13 HK VELOCITY End COMMENTS INLET CONT. OUTLET CONTROL Treat HW/D HW Ke do (dc+D)/2 ho H LSo HW C.M. I Smooth ELEV. Proposed 18" CM Culvert (2 yr) 3.96 3.96 0.80 1.2 0.5 0.6 0.93 0.93 0.2 2.0 -0.9 1.2 5.87 ES-1 VDOT STD EC-1 ClassA1 Outlet Protection Proposed 18" CMP Culvert (10 yr) 5.31 5.31 0.95 1.4 0.5 0.8 1.03 1.03 0.6 2.0 -0.4 1.4 6.35 e amen rap esign MATCHLINE, SEE SHEET 4B FOR ESC I . I I I I I DI drainage area (acres) (<3) 1.23 MEASURES FOR SANITARY SEWER & I I trap volumes: 1 VARIABLE" EX.DI elevation (ft) area (so volume(cf volume(cy) SIDEWALK IMPROVEMENTS EX. CREST OF STONE WEIR y,,R,A• 408.00 394.0 0 0.0 �I ��-- \ \ \ I 410.00 726.0 1,103 40.9 "�' "� \\ VA \ \ 412.00 1141.0 2,955 109.4 414.00 2253.0 6,286 232.8 DRY STORAGE ry N VARIABLE /4 WET STORAGE I FILTER CLOTH ORIGINAL GRJND (EXCAVATED) wet storage: 1 ELEV. / ,c� \ \ \ \ -SEE PLATE 3.13-1 COARSE AGGREGATE•• CLASS I RIPRAP w/ WIRE �� wet storage required (cy) (67*DA) 82.4 SUPPORT SF I I I I I l/ / l l (\�\\�\ \�\ ��\\ / / \ \\\ \ \ bottom of stone weir (ft) 411.20 w/ WIRE wet storage provided at this elevation (cy) 82.4 SF ♦ I /� \ \ ■ slope of wet storage sides 1:1 SUPPORT I I r� Is*� �■� ■�� �i�\� C\ weir length (ft) (6ADA) 7.4 \ dry storage: bottom of trap elevation (ft) 408 dry storage required (cy) (67*DA) 82.4 bottom trap dimensions: 71'xT crest of stone weir 413.00 top of dam elevation (ft) 414.00 � dry storage provided at this elevation (cy) 88.7 top width of dam (ft) 2' EXISTING TREELINE (TYP.) I I \ \ \ \ slope of dry storage sides 2:1 top trap dimensions 115')23' PROPOSED SAFETY \v 430.9x FENCE AROUND A\\ I \ I VA\\\ \\V\ A x Q l x 4B73434.5 x16.B\x SEDIMENT TRAP 4433.4 84.7 x\ \ \ SEE THIS - \ - - - - PROPERTY LINE "I ��� x . I \ SHEET .\ \ ESC PH I ST #1 v / / / ST1 PROP ,(� DETAILS / / // / DA= 1.23 ac. A \ VA \\ -1,11_ 00, " / 0 Q /0 - - - - - - / / (DESIGN DA-1 23 )5.z / SG - a - / 0 9- - � SF / tv / 048 w/ WIRE 484.Ex x90 SUPPORT 0 Q / 0 z �/i 4 w�AMENDED LIMITS OF / ♦470.9 ♦x V \\\ x DISTURBANCE = 17.17ac. 495.1 4B9. z w �- - �0 \ x - - _ LOCATION OF CONTRACTOR PARKING & 1 \ / -_- _ / STAGING AREA WITH PORTA POTTIESDUMPSTERAND FUELING , ♦ \ \ \\ / Q / / _� / / // I /I / I , TANK _ - - j �_ - / / / / /� / / / i / _ / / l I • •'.� \ 471.5 / 9.z APPROVED x - -�` _ - - - �390// - - - // �\� • � �■■�■����� WASH RACK � - - -__ - / - -- / / � � � I k t I ■ � ■ I 12'x70' MIN. x 490.8 C E x x 492.8 / 494.8 / TMP 782 /S/tate�-Fp/a.rm -A/atc� /// // --- _\ •\� _ -�i-' �- - -- - --_- -� _ - / _ �__�� �/ / /3 f l I I I A■ I Ij FLOW DIRECTION A t�lnsurel%e IARROW (TYP.) -D.Ey t �47 D.B. 5&9 p. �5, pi55at XLIMITS OF PROPOSED - - - - - / \\ TREE CLEARING (TYP.) I I ♦ I -- - I I I I I I-47 / / // y ---- ✓/ EXISTING PRESERVED / I I I I = ° v A / / - i STEEP SLOPES (TYP.) / / } ♦ I I I \ \ \ _ / I / _ _ -- - _ TMP: 07800-00-00-020J0 - _35p�- CONTRACTOR TO ENSURE POSITIVE � _- � � / / / / � � % // � � � ! %� I I DRAINAGE DIVIDE (TYP.)-� - �� \ ° � � =�6, � � OWNER. JDM 11 SF NATIONAL LLC - / s c / / DRAINAGE ALONG DIVERSION BERMS \ / / / / / / / - C/O STATE FARM MUTUAL _ / \ �► / I APPROVED ESC PH I - AUTOMOBILE / / / / y p! // 5 ♦ I� ` _ SB #1 DA= 8.55 / ♦ x I _ CRS - APPROVED BASIN DA / / / / 1 ZONING: COMMERCIAL OFFICE i _ V ( / / _/�Xl- - - - / co \ SIZED FOR 12.00 ac. � / / / / / - - ACREAGE: 19.88 AC _ DID •�•�� I \ I I \ \ - - \ \ // / / / / // / _ - - DB/PG: 4475/728 \ ♦ _ - �� x 45e 6 = / / / /// / - x459.9- -- ♦ ��•� / / I I I I A / / J �� •� / / / _� / �� \ / C / l \ 460.9 O �♦ / / // // / / A // / ♦ I �- A A I I / / ////� 1 / / / _/ / / / / ♦� v y_--- i ♦ / / / / ° ° /�-_/ I v v i _ PROPOSED SAFETY FENCE / �1 / / _ ° \ / / / // - - - AROUND SEDIMENT BASIN 464. x CIP x - - - - _ 0 APPROVED ESC PH 11o2.4 �/� ��♦ ° / l l I // // //// I I I / / / l / / / / / // / ///// \ / t / / A / SB #2 DA=1.78 ac. -- l / / (AMENDED DESIGN / / 4064 = \ _ i►_w/ WIRE l I 1 I DA-6.04 ac.) ��� / \ . / /�U x SUPPORT SF I / = APPROVED TEMPORARY CULVERT #1 _ I I x xx v > v /�/i� / / �� / ° I III \ -7 0 01 / DRAINAGE AREA=2.07 ACRES I / / / SOIL DESCRIPTION (TYP.) / CRS �I 18" CMP, 50.00' @ 4.00%, w/ (2) ES-1 I '/ / _ y �/ / 2L3 + 402.8 / / U TP ° \ �� I INV IN=412.00, INV OUT=410.00 � / TMP: 07800-00-00 020M3 4s3.Bx x CD ?=ROVED CLASS Al OUTLET / 464.4 �"j \ OWNER: MARTHA JEFFERSON HOSPITAL I I / / I I �" / / �/ % / / / / / / / / • / PROTECTION w/ GEOTEXTILE FILTER B •+- _ FABRIC UNDERLAYMENT v ZONING: PLANNED DEVELOPMENT MIXED v I / I / I ° EXISTING GRAVEL DRIVE TO - - - - I x / I (L-8', W1-4.5', W2-9.5', D-1.5' MIN. I (I I( l COMMERCIAL 463.8 l I II I V A OP BE RE-ROUTED AS SHOWN - 0.7 ° -�� I I ACRLAGE,: 26.98 AC / I I �3 / / /-/ ��� EXISTING TREELINE (TYP.) �i -_ / I / SEE SHEET 8 FOR RIPRAP \ V \ \ / // I I I / / / / / / / x \ OUTLET PROTECTION --/ i � � - - DD \ � � \ � x 463.z � �x \ \ \ SOIL L LINE (TYP.) DESIGN &DETAILS / / TS ♦ \ RR' - 399-5 EXISTING °; / / ♦ \ A \ \ \ \\\ TREELINE APPROVED ESC PH(TYP.) 69 (APPROVED DESIGN I \ CONNECT TO EXISTING / Y DA=1.26 ac. x \ \ _ = APPROVED 48" RCP STANDPIPE I GRAVEL DRIVE APPROVED DC k I / / \ \ TO SERVE AS RISER STRUCTURE I � PROPOSED 48 RCP STANDPIPE I x `� 1 A \ ° _ � _ \ _ _ I O I I ° / PS � /� STOCKPILE ARE \ \_ \\ _ - - \\\\ \\\ / // /, CONTRACTOR TO ENSURE POSITIVE \ TO SERVE AS RISER STRUCTURE I °// I 100 STREAM �I I / _ _ APPROVED_ BAFFLE / // _ DRAINAGE ALONG DIVERSION BERM BUFFER \ CONTRACTOR SHALL INSTALL THE PERMANENT DRY I ♦ / APPROVED SAFETY FENCE / I \ \ _ - ND �IJAPPROVED SAFETY FENCE DETENTION CELL EMBANKMENT, RISER FOUNDATION; I I / AROUND SEDIMENT TRAP / "\ - - _ �� I II BARREL, OUTLET PROTECTION &SPILLWAY AT THE TIME OF TS I f�W ♦ I � �� � �__� � � � AROUSEDIMENT BASIN THE TEMPORARY SEDIMENT BASIN s CONSTRUCTION. _ -LOW-FLOW ORIFICE SHALL BE PERMANENTLY BLOCKED � �- I �♦ I � DD ♦ � /+\.� � _ _ � ° � - A - '� V� VAV �-�/ / . / / I I I I I I I / / / � �\ - \ WATERTIGHT DURING ESC PHASES. CONVERSION OF BASIN ♦ ♦ DC / / / \ \ - \ \\ \\\ \ \ \ \�/�\v \ OO SHALL ONLY OCCUR AFTER ESC INSPECTOR APPROVAL. I I ♦ \ \ ♦ \ -\\� / SEE SHEET 8 FO1QDITIONAL DESIGN DETAILS. ♦ ♦ / _ _ - - - -- \ _ \_ _ - / / ` \ // / / • I I I I I I l / / / / / PROPOSED ,BAFFLE\ I I � � l TP I I �+ �♦J \ \\\ �♦ - I I \ \ \ \ FLOODPLAIN (TYP.) \ APPROVED STOCKPILE AREA _�,_�} / ■ ♦ - - - _ - 2 I I / TO BE ENCOMPASSED BY \� + I y*�� ■ ■ i■ f 0� �` _ -� \ •1� \ \_\� - - - - - _ - \ \ \ \\ - \ \ \ DRAINAGE DIVIDE (TYP.) \ \ \ SILT FENCE AT ALL TIMES - - / A ♦ V \ _ 314.6 \ \ \ \_ \O\ \\ \ \ \ X / O x \ x \ \ / V \ \ \ v CONTRACTOR TO ENSURE POSITIVE ♦ - ! �■ ■ I I \ \ O \ \ \\ DRAINAGE ALONG DIVERSION BERMS ` - - \ - - �1♦ - I I / . - _ .� � _ �-� v � �♦ - � _/./� l 352/ 1//III / � w/_ � � - �� orre a�evelopm_ SUPPORT\ 4 �2 (plat 39L 5'0 LIMITS OF PROPOSED R607=pp. 72 B1TREE CLEARING (TYP.) V // / / \ EXISTING GRAVEL ROAD OP - v TP_,� SF -----w/WIRE/, RAP S \ - - _ - - - - i F-SlJPP03T - 5D- -D' 25 / =50 00 200 307.5 (x LIMITS OF DAM INUNDATION ZONE �/ �j1 / / x APPROVED 30" 308.4 \ \ �� \� ���� �r��� VA V� �A _ \ _ APPROVED VDOT CL. I RIPRAP WITH RCP BARREL FABRIC UNDERLAYMENT. SEE � FILTER F- CONNECT TO EXISTING - - - - _LIMITS OF DAM INUNDATION ZONE (TYP.) _ = N/FE _ - �`�10 - GRAVEL DRIVE -ter APPROVED SHEET 7 FOR DETAILS. _ - _-_ % _ v _ �v v v v x - / I i�h NTH 0�� SCOTT R. COLLINS'� U No. 35791 � ZONAL v�Acl�;Z) Zz o Oa LU U) � J z Q 0 z Ww W Lu I Q M L9 0 z Z ti w C'7 0 N z w WN o z N Q z Q 11L > ZLLI J J O J_ > U z L9 F__ F_ F O z U 0 w Q w U Q I6 0 w Q 016 Ul LU � J z LU O ZLU O = O z w J 0 w () WJ Q LL LL o w o r-, N Q 0 � LULU a � JOB NO. 172131 SCALE 1 "= 50' SHEET NO. 4 (III1"IIIIIII6 IIII�IIII*IIIII� ����� \ / MATCHLINE, SEE SHEET 4B FOR ESC MEASURES FOR SANITARY SEWER & l SIDEWALK IMPROVEMENTS cONC / H oF� SCOTT R. COLLINS U No. 35791 ,� o��ss UU /� ////P / / / /�� //i // / Q — — -440— /// /� / /�/� / / // �� I w/ I E� AF AF iAlf `1P�OOT� -I Ilk EXISTING TRE�EL�INE (TYP.) kl PROPOSED SAFETY FENCE AROUND / / _ / - (SEDIMENT TRAP ■ 1 V A \ \\ \VA V o Q / / /♦ \ \ \ /.� 0 SET ISI SHEET F R \ \ \ \ L _ _ ---- S -- --- — — — — = —%/ / / / / // �ETAI S) x� I I I I \ \ _ / o �/ / ■ I I / I I �� �\ \ w / / u z w/ WIRE j I V��\\ / / / w SUPPORT ♦ �Q / / _ / V� \\Lu AMENDED LIMITS OF 17.17ac Lu DISTURBANCE - — — — — — _ PP7% — % /i 'j / // / / / / // // / //'I I I I I ■ LOCATION OF CONTRACTOR PARKING & \ / // / / / � // � I / I I I I 1 I I I I I / / x �� / STAGING AREA WITH PORTA POTTIES, \ \\ \ / x.oi / — — �— --� / A/� i� j j�/// ////�//►/ / /���I I I I ( I I I I I I I DUMPSTERA , AND FUELING TANK 9 - - --- _-�4/f'State-Farm 34-atual / — — — A t�lnsurai — / __ -- o —D.1 p _4-7 t ~ MD.B. 669 p. 55, p57 LIMITS OF PROPOSED TREE CLEARING TYP. /j 7 — �v lie EXISTING PRESERVED - / - / . I STEEP SLOPES (TYP.) / _ / \ ago 39� / I I 1 = \ - -- — -- I _359' — �/� ` //j/� CONTRACTOR TO ENSURE POSITIVE / / ° — -- — TP / / ♦ I \ / / /— // DRAINAGE ALONG DIVERSION BERMS /- - / / // ///—- - — i/ i / /j/ /� / / 0� / *�. S ♦ I \ \ AMENDED ESC PH II - — _ _ = CRS - SB 1DA=10.41ac. / // /// / / / —� - W , // / A/ _ _ —_ �34 � � � �/ / � / / �• I I co \ v _ _ \ (APPR VED DESIGN � / / / / / // / // � — — - _ _ -/pcyi ip \ \ / j 0 -- — _ w ��//i / / / / ///// / / _ / //\� _ ♦ \ \ �� _ / _ // / _ / / , / /// // // //// / Z 101, Q N ♦ / � vvv ��� ° � I I I // / / � � —O — — PROPOSED SAFETY FENCE / / / / ' ♦� / _ _ ° / / I — v / / N /// / / / / ///— -- v V AROUND SEDIMENT BASIN IP ° / — — / • Ld / / l�IRE SF ® lmiIIIIIIiim_�PORT � —_, //i � � /%/i /i/i d l l _ ////_ \ w I 3A��k � � VA \ I I � \ ° � � �APPROVED CLASS Al OUTLET 1 _ / j \/ � I � � = J � l l� / / V �' / _ �� l / l D/ / �. \ _ PROTECTION w/ GEOTEXTILE FILTERLu / Sg ° I I I — \ �� FABRIC UNDERLAYMENT i`, '♦♦ ° / / / / I ° V (L 8', W1=4.5, W2=9.5', D=1.5MIN. ��20 1 11 (I / / / l l I I I I l / / l / / \ _j Lu H� �\; R ♦ _ / / / /_/_ / e \V A ° \ A\ \ w — — _ \\\\ \\ \\ �\_ V��/ / I I I I I I I I I I �3 // / �♦� I IEXISTING TREELIN—E SEE SHEET 8 FOR RIPRAP OF Lu4OUTLET PROTECTION DD DESIGN & DETAILS TS �— / / I I / / // ♦/ / / _ (%) I EXISTING __�— v N� \ \ _ I I II I / ♦/ / Q � TREELINE ,/ / ♦� v ° A \ — — \ \\\ \\\\ \ �� — �� i // i i I ♦ l lcz (TYP.)Lu / I / / ♦ -_' \ / � I I I I � / ♦ / \/• / _ / / / / _ AMEN ED S II \ \ , RCP S I TANDPIPE — \ \ \ a / / /�i� I _ l / l I 1 _ 0 I \l I l / I / _ � ♦ ST,# DA= 9 c. APPROVED 48 \ I \ I\\ \OOI \0I\1 \ \ I \ {IPROD WIEELE, I\QRP, 1 I IIIRIWI I I II �° I I��I�1I ♦/1 P�S� � �_ . / //■ / ./ RISER ISER STRUCTURE (APP t — 43 - _�vv\\\\\\ \ //�////�\ // ///// //,///_ — � � � —�_�—\\ ��/ � II II / _ // =♦I /♦ / I /1 x ♦I I I I/II I IIII= I I/I I III I II I IIII I II III III I / ' 'I// I 1 1= yl� 0~Z v~H) O POSED 48 RCP STANDPIPCONTRACTOR TO ENSURE POSITIVE OE TO SERVE AS RISER STRUCTURE / MDED SC PH II \ /100 STREAM B #DA8 ac. APPROVEQ DRAINAGE ALONG DIVERSION w BUFFER RATR SHALL INSTALL THE PERMANENT DRY /S-APPROVED SAFETY FENCE UJ N CELL RISER FOUNDATION, NT(AMENDED DESIGNLu ET PROTETION &SPILLWAY AT AROUND SEDIMENT BASIN \RS Y SEDIMENT . FLO BE PERMANENTLYKD 1D . ERTI IN SHALL NSPECTORQPPROV L. �CPNASSCONVERSION IF B�S/f W SE DESIGN DETAIL ROPOSD BAFFLE / \ \ � � \o• \ � \ \ \ \ \ � _ \ \ � I � \ \ \ _ � � � � � \ \�♦ , Lu v \ \ \ v \4fl Q LL 1 \�\VAA \ VAv \\ \ ���v�\VA� ♦• •�' r _ v v -- - - v //I �I II III/� LL Lu 1 V vv�vov v — - -- —_ — —_ /� �� v — __ — - ___ o� _ // I I I I I I_I I t/ / o '� _ x r ■r r DD �/ - \\■ ■■■■ _, s8 Asa- "♦ \ - �♦ -- � �� //_ // // /// Z �� \ \ \ • \ V AA \ V A w/ WIRE - \MP 7\ qw �lon#SUPPORT \ v A F Worre hand ev�n � VA \ V - V\\ ° — - ■� i _ / / / V \ V \ D.B,.,, 2544 p, 2 2�5 V A vAND D.B"' 2, 0 72 57`3 a � �\\ \ V LIMITS OF PROPOSED VA\\ ' �� _ __ C — �- / / // // / / w Lu D. B� 1673 p p. �(� A TREE CLEARING (TYP.) \ \\ v �� - - - A — — — i // / // / / / // Q/ p w \ 4\ y \ v — V A \ \ v - A\ V \\ ��� v� — �-� ��� �Q = — — % v/ / /j // / / / / JOB NO. �� F �' w/WIREj\ lj 1721.31 T OP— ���LIM TS OF DAM INUNDATION ZONE ��_ ioo / 200` SCALE — — ---—_ ---�7 - 1 -50 \ \ \ APPROVED 30 — — �, — — v � APPROVED VDOT CL. I RIPRAP WITH RCP BARREL — SHEET NO. - � FILTER FABRIC UNDERLAYMENT. SEE � — — � � ' / �iN F/T LIMITS OF DAM INUNDATION ZONE (TYP) / �\ APPROVED SHEET 7 FOR DETAILS. / / / / - 4A 11 / II\II/ �I III IIk IA/I/I 1�A IIi/ /IIIiI 1� III1III \\\I xII�/ � 1/ IlII �� lIIv\ I\I1III I I -IIIj•/�\%\ I.II I. /I1I I I�lIII I II1\\llII I II3/ III I l II/ VIi I/ IIxII12 II 'I IIIIIIlIII I //III III0I/lIII/\ IIIIlIII/ III/I I I/I1 �� l II�lITIA/II//I� II IlII/I III1VIIIAI/ I IIIl1III I IjIIIIA / I /IIIIl/IIII1I II II I I ILI� \/ l/II1 /O /S•/�II/—/�I 1l I�I /l� / IA /�lI1.I III ,/ 1 IlI\. /I R Ol � I/ �\ IxlI✓II �lIIIIPI°II I/l"E��I X\:IlI\ l� I/.I IDI// :Iy :SI I I I l® IIHI • :/ED�\/\\ /S E/ X4./D� I&_\ � V.� . x 3 �I / �// /�/\ ,/ / /) / i ./ ,% _////,/ P/�// /D/ // �/D/�///•/ i /y/ /:I/ / /// //��//�I / � /// /I//// I \ \/ /,/ \%// ///- . �/ I// a / /// /I/ °/// / .I./ ///yI I Av\/ /— '//// // I /// // /�// /� /'/x• //// /, i� / \ /I -\ \I �/ / v /./-//I./j//I/'/ I vI—_// �%\//�I _ °���/ //��/ // .A ( / ///\_I/P/ M / // % _ A //�//���/ �o/////,•, �I .aII,/ /lI/ ll1/ iI ��.II � II I I I l I 1 -vII �I \ /-V P\II H/,I\ \°I II\I/�I�II\\ _ I I 1I\�, TiI `I v\ .1 V_ ,\I��� �- \� �/1 I I\�� '- �1 /I 1 .1I/-\/�/I / :,/./_/ / �I/�;. ©1/ 1// /11/•/ �I I // I �;/ / //S- :I � I/ .I.OH�/�J/I 1/IE/ �SIF/ /,-lE/,I F/ l,h /�/I/� � ;//I/ .I1/ / I// �/ / / I //IYI/ l 1 �/♦I//G�I// ��/�' �/♦ tix��/ 1; �iI� �\, / /�� I/ I��II �I � �/I♦\ / II I 0 �; I I� I I I /II IE II/ /�a;. IIIlIrI/ , ♦HP0)II � T IN I \i�\/{/\ I/'•A . •\ . a \ \ Dr�I/Iam.�/_-I •. I I�A.\s�.. � • P s�\l\ v/s•\ • � I ° ♦\- / �./-:.v- :\ \o .y♦ /• ♦ I-1 - \ v � \ � A♦/ \.. : � \o / � \•/ / / /� �' / � ��Q! / ��- ��Q.//:••I����•/ •�/ ;/\� �/ \'{ � /i♦D _ / � / /■ /� /\/ ✓_ —— � - —_ --y — — —/ zzow H OSCOTT R. COEL ,z�Qf�zL2-IpN- S '': \ U No. 35791 ,� CONC � PH III ST# 0.56 •�ONAL N 2 a101I 4�DCALXIT F DISTURBANCE -4�U IS ED TO DEFINE % THE RRM BOON RY FOR SWM' / C/ IRQUALI ULATIONS. SUPPORT,, EXISTING TREELINE T i I I : � I PROPOSED SAFETY FENCE AROUND / SEDIMENT TRAP \ \ o SEE F1L 00 ID�SI N—S� Q 7/ U-) z w/WRE SUPPORT -- Luf� OR AMENDED LIMITS OF DD DI&T-URBANCE=17.17ac. LOCATION OF CONTRACTOR PARKING & .Dl STAGING AREA WITH PORTA POTTIES, DUMPSTER, AND FUELING TANK / a`" LIMITS OF PROPOSED TREE CLEARING (TYP.) .Di 36� EXISTING PRESERVED STEEP SLOPES (TYP.) _350 CONTRACTOR TO ENSURE POSITIVEL9 DRAINAGE ALONG DIVERSION BERMS DED ESC P / �LuJ) 34 % (APPROVED DP cy) Lu WI �u / PROPOSESFETY FENCE MA INE,III IT, AROUND SEDIMENT BASIN EE T 3EEr / 4A I I iLi'lNml I m m Lu w/ WIRE 6 O SUPPORT ENDED ESC SB #2 DA=6.04 ac. r (Lz�ozzi�-u (AMENDED DESIGN DA=6.04 ac.)OLUEXISTING TREELINE TYP.) SEE SHEET 8 FOR RIPRAP OUTLET PROTECTION DESIGN &DEU Lu EXISTING XISTINI G \\ � \I\\ V\ ♦\�\\ �Av\ \\ I / \\ �� \VV �\�1I I\\ V\\A�\\� oIV \ A / A� v���\ I SVA�\HAI �A�\o\\AIL\ A�I L\\\\/\y� \IOL� \ \N\VyA / \\R A � /V\ A\A A \ AS\ AI\/\\H\ \\� �I v\\A2\B�. ►AIV+Vv\A♦AI A\ �I I I\I\ \\\ II \II \ �\ II I Iv \� I I \\ � vII�P �\ \+ \v\ \�\ I I v .I.1\ Iv\\II� \\v �\I\ \�.,v\ /( `//\/� l\y °\�� � /\\ ° \ °: Io\ � ©--- o\° i_-_ . �_ / //// // : �— �/—' Pw�P//P'WOa/ 'I/ /RR-TE_ cA�oF _\ �SA \ A\ \. \�\�\V� \.�'�— '�' \- o Ji�� Y ♦ - . 8 "R�RI"SC--E►PR_ \ S-S\TT_�-A- _RNU—\D\CP\AT\ PU—P: ER\R\ E\\O_ _T__-V-� —_E— \D�-B-� _An©F\. F— L, _�—E \ ; A \A` PP��J\\R-_ P A\ AOA \Vv`\\ E� �� D�\\\„� \S\°♦\ �� �A\—� F\� \ E�—.T� �iY F�w E\/N_�W■�CI—ERJ�E/■/x \/, / /■//-\ -/\ / �//—� /-�-�i�,/o�-- ��\—�\� ■�—�_\•�D� -—� i\° ��°—j � �J— °—°��j \ _/ J— � �——_I--I I —I—--I —�_—i8 / �3/ /9 �/�_� S// ��///°/ � //� �—/ /l/ l� / t � ♦l�_ /� � � I—� �� I— � —� �/♦ III i �•Il /=IiI = /1I 1 1/ I • /II I1 / 1/I / I II /l 1I/ 1 II /� 1 /I iI�I — OOCJQTyzQQI� cOOz�1� zTREELINE LjL Lu (TYP.) PROPOSED 48 RCP STANDPIPE CONTRACTOR TO ENSURE POSITIVETO SERVE AS RISER STRUCTURE 100 STREAM 1 _D�OR SHALL INSTARAINA E ALONG DIVERSION BERM BUFFER RACTLTHE PERMANENT DRY w CELL EMBANKMNT, RISERFOUNDATION, Lu L. IRREETPOION&SPILLWAYATTHETIM OF THETE YSEDIMENT SIN's CONSTRUCTION QW-FLOW L BE PERMANENTLY BLOCK D TERTIG IN�PHAS S. CONVERSION OF BSI O F INS ECTOR APPROV/YL• Lu S SH T$F DESIGN DETAILS. P v) PROPOSED BAFFLE Lu LL \� go' -8 20M�SU�orreM�'ar� Veveopmn� D. 2 44 p� 2� 50 pI LIMITS OF PROPOSED P. �0 TREE CLEARING (TYP.) LLu u 73JOB NO. ��1 172131SUPPORT 4jj� A 7 �� V - \ - — _ — — _ — — — — — — / / SCALE \VAS _ LIMITS OF DAM INUNDATION ZONE _ / / / — � � — a � i a � zoo \\ — � ------ RCP 1 „=50� APPROVED 30" J — APPROVED VDOT CL. I RIPRAP WITH --- - y�� BARREL -- FILTER FABRIC UNDERLAYMENT. SEE / / SHEET NO° X - i — LIMITS OF DAM INUNDATION ZONE (TYP.) APPROVED SHEET 7 FOR_DETAILS. - - -- / - — --_ - _ _ - - t,1 --50/ft/ / / 48 FMTER FABRIC ENTRENCHED 6" COMPACTED SOB. 3' MINIM M - - I III III �II� III III III�� IIIII IIIIIII is" -111 III -III y�tttY e DD TEMPORARY 18" DIVERSION BERM 1992 3-Ub I i rW2 SILT FENCE CULVERT INLET PROTECTION DISTANCE IS 6' MINIMUM IF FLOW IS TOWARD EMBANKMENT FLOW OPTIONAL STONE COMBINATION FLOW I RIPRAP T'VDOT #3, #357 OR #5 COARSE AGGREGATE TO REPLACE SILT FENCE IN " HORSESHOE " WHEN HIGH VELOCITY OF FLOW IS EXPECTED Source: Adapted from VDOT Standard Sheets and Va. DSWC SHEETS OF 4'x8 xj' EXTERIOR PLYWOOD OR EQUIVALENT I I I I I I I II 4' I I I I II I I 8' SEDIMENT BASIN BA APPROVED Sediment Basin #1 Design drainage area (acres) 12.00 basin volumes: (using 2' contour intervals) elevation (ft) contour area (sf) volume(cy) 374.00 3270.0 0 376.00 4626.0 291 378.00 6198.0 690 380.00 8011.0 1215 382.00 13798.0 2013 384.00 20485.0 3275 wet storage: wet storage required (cy) (67*DA) dewatering orifice elevation (ft) wet storage provided at this elevation (cy) available volume before cleanout (cy) (34*DA) cleanout elevation (ft) distance from cleanout to orifice (ft) (> 1') dry storage: dry storage required (cy) (67*DA) principle spillway crest (ft) dry storage provided at this elevation (cy) diameter of dewatering orifice (in) diameter of flelable tubing (in) (orifice+2") runoff: C (use 0.45 for bare earth) tc (min) 12yr 4.0 Q 2yr 125yr 6.7 Q 25yr principle spillway: available head (ft) diameter riser (in) spillway capacity, Qp (cfs) diameter trash rack (in) barrel length (ft) head on barrel through embankment (ft) Plate 3.08-1 diameter of barrel in 1992 STORE � 7D' MIN. - ACCESS 3" 510-24 AS'P►iALT TOP c asF EXISTING zss zx PAVEMENT 6 WN_ 71A ACC HLwLIL BASE -PROFILE STONE 7V M:N, C0KSTRUC110N ASPHIALT PAVED ACCESS WASHRACk ' � E7tl$TIHG } 2X 7X PRYEtrEtVT +-POSITIV[ DRAINAGE *MUST EXTEND FULL WIDTH A TO SEDIMII or iNCRESS AND EGRESS OPERATION TRAPPING DEVICE ELM 12' YIN. QjITIVE PMNAUIL 7r0 SEDIMENT TRIPPING DEVICE ALTER CLOTH -� SECTION A -A X nimunittut wale lap of 1l orals Mawt be iii0iffiel milk a a1nlWttrll I each ballcuck, s11111Itottvah-e RSIP131I a Wad] hose ►r11:11 a (halltehn of 1 .; inch" for arle.lnate ealr>stault l>'rexsyur. �1�aalr vrntet uR>I�t be c�lllrcl na•n}hnlll tits ellbusce to azI alxpraZ•ed xetlluLa aI ea to IeLun1•r r?eclunetd dill necituletll �13+i11 Ue }�1e1'ealted y olu culcmix stoun chants. ditches or watetc-ouists. PAVED WASH RACK NO SCAJ 3.01 SAFETY FENCE 10� of # mom son Aso ■■■ 0 PERSPECTIVE VIEW PERSPECTIVE VIEW PLASTIC FENCE Source: Adapted from Conwed Plastics and VDOT R idge Standards PERSPECTVE VIEW METAL FENCE Plate 3.01-1 VE Cc NO SCALE RISER CREST ELEVATION I I I POSTS MIN. SIZE 4" SQUARE OR 5" ROUND. SET AT LEAST 3' INTO THE GROUND _E DETAIL DESIGN HIGH WATER ..(25-YR. STORM ELEV.) MIN. 1.0`''�}'' DRY " STORAGE " WET " STORAGE SEDIMENT CLEANOUT POINT (' WET " STORAGE REDUCED TO 34 C.Y./ ACRE) MIN. 1' W1 SPILLWAY CREST OF EMERGENCY 2' WITHOU T�SPILLWAY RISER CREST DEWATEOL1.10E � ' 804 design high water 382.25 378.43 top of dam (ft) 384.00 804 top width of dam (ft) 10.0 408 bottom of basin (ft) 374.0 376.56 approx bottom dimensions: 38'x130' 1.9 upstream face slope: Varies downstream face slope: 3:1 804 baffles: YES 381.25 length of flow, L (ft) 125 910 effective width, We (ft) 89.544 8.0 L / We (baffles required if < 2) 1.4 10.0 collars: YES depth of water at spillway crest (ft) 7.25 0.45 slope of upstream face (Z:1) Varies 11 slope of barrel (Sb) 8.80% 21.6 length of barrel in saturated zone (Ls) 34.48 39.8 number collars required 2 dimension of permanent collars 6.9'x6.9' 1.00 emergency spillway: Yes 48 required capacity (Q25-Qp) (cfs) 0.0 40.0 bottom width (ft) 100 72 slope of elast channel (ft/ft) 33% 99.45 minimun length of exit channel (ft) 36 9.75 crest of spillway (ft) 382.75 30 3.11 1992 TEMPORARY RIGHT-OF-WAY DIVERSIONS TYPICAL GRAVEL STRUCTURE TYPICAL EARTHED STRUCTURE Source: Va. DSWC PIPE OUTLET CONDITIONS A A D° \ \ \ \ \ APPROVED SEDIMENT TRAP #2 & SEDIMENT BASIN #1 DETAIL �TH 0 _ SCALE 1 "=30' ��P_ TO S SCOTT \ R. COLLINS'� \ RIS UCT SER - D APPROVED - SAFETY FENCE / - \ --- - U No. 35'791 � AROUND SEDIMENT TRAP V \ : BEDDED A v \ \ V� o� N N PRO SER BE EMBEDDED M O O A CONCRETE -BASE. ��s101VAL t 388/ A ` V CRE E DIM NS: L= ', =8', D=1.5' \ C,\ \ \ \ \ / 378 \ \ \ \ --- -- Nj - \ A O SAFETY FENCE U SEDIMENT BASIN OVED BAFFL - / 372 zO J r 00000 � ,� --..'Y fY ICY YYY U m \ LU Ln APPROVED STONE - - - \ Da \ \ _ WEIR OUTFALL - - - - �� Z (L=8', W=7.6', D=2.5') / - AA \ \ to� oP OF DATA v , - A �"� p \ j LU t - LU c o: i -k- /. APPROVED 100' WIDE RIPRAP LINED EMERGENCY SPILLWAY CREST ELEV.=382.75' APPORVED / 3.18 PIPE OUTLET TO FLAT AREA WITH NO DEFINED CHANNEL PLAN VIEW L a II- II d SECTION A -A FILTER CLOTH KEY IN 6"-9"; RECOMMENDED FOR ENTIRE PERIMETER A A 3do (MIN.) do PIPE OUTLET TO WELL DEFINED CHANNEL PLAN VIEW L a 0 % - a SECTION A -A FILTER CLOTH KEY IN C-9"; RECOMMENDED FOR ENTIRE PERIMETER NOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, GABION BASKET, OR CONCRETE. 2. La IS THE LENGTH OF THE RIPRAP APRON AS CALCULATED USING PLATES 3.18-3 AND 3.18-4. 3. d = 1.5 TIMES THE MAXIMUM STONE DIAMETER, BUT NOT LESS THAN 6 INCHES. -- Plate 3.11-1 Source: Va. DSWC IYYZ Plate 3.18-1 3.32 TABLE 3.32-D SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA Total Lhs- Per Acre Minimum Care Lawn - Commercial or Residential 175-200 lbs. • Kentucky 31 or Turf -Type Tall Fescue 95-100% Improved Perennial Ryegrass 0.5% Kentucky Bluegrass 0.5% High -Maintenance Lawn 200-250lbs. - Kentucky 31 or Turf -Type Tall Fescue 100% General Slopc (3:1 or less) Kentucky 31 Fescue 128 lbs. • Red Tap Grass 2 lbs. Seasonal Nurse Crop 20 lbs. 150 tbs. Law -Maintenance Slope (,Steeper than 3.1 � Kentucky 31 Fescue 108 lbs. Red Top Grass 2 lbs. Seasonal Nurse Crop* 20 lbs. Cruwnvetch "` 20 1b5, 150 lbs. ' Use seasonal nurse crap in accordance with seeding dates as stated below: February 16th through April ...... . .......... . .... Annual Rye May Ist through August 15th ....... . . ........ . ... Foxtail Millet August 16th through October .....- ... . ...... . .. . . . Annual Rye November through February 15th , .... . ......... . .. . Winter Rye " Substitute Sericea lespedeza for Crownvetch east of Farmville, Va. (May through September use hulled Sericea, all other periods, use unhulled Sericea). If Flatpea is used in lieu of Crownvetch, increase rate to 30 lbs./acre. All legume seed must he properly inoculated. Weeping Lowegrnss may be added to any slope or low -maintenance mix during warmer seeding periods; add 10-20lbs.jacre in mixes, AMENDED Sediment Basin #2 Design drainage area (acres) 6.04 basin volumes: (using 2' contour intervals) elevation (ft) contour area (sf) volume(cy) 352 4631.0 0 354 5961.0 391 356 7393.0 885 358 8925.0 1488 360 10557.0 2209 wet storage: DESIGN HIGH WATER (25-YR. STORM ELEV.) MIN. 1.0' DRY STORAGE " WET STORAGE ME SEDIMENT CLEANOUT POINT ( RAGE TO 34 STO/RR REDUCED 30 RCP - \ BARREL AMENDED SEDIMENT BASIN #2 DETAIL w N I- _� MIN. 1' WI SPILLWAY CREST OF EMERGENCY 2' WITHOUT SPILLWAY RISER CREST DEWATERING DEVICE wet storage required (cy) (67*DA) 405 design high water 356.75 dewatering orifice elevation (ft) 354.05 top of dam (ft) 360.00 wet storage provided at this elevation (cy) 405 top width of dam (ft) 10.0 available volume before cleanout (cy) (34*DA) 205 bottom of basin (ft) 352.0 cleanout elevation (ft) 353.03 approx bottom dimensions: 32'x140' distance from cleanout to orifice (ft) (> 1') 1.0 upstream face slope: 2:1 downstream face slope: 3:1 dry storage: dry storage required (cy) (67*DA) 405 baffles: YES principle spillway crest (ft) 355.75 length of flow, L (ft) 49 dry storage provided at this elevation (cy) 823 effective width, We (ft) 147.102 diameter of dewatering orifice (in) 5.0 L / We (baffles required if < 2) 0.3 diameter of flelable tubing (in) (orifice+2") 7.0 collars: YES runoff: depth of water at spillway crest (ft) 3.75 C (use 0.45 for bare earth) 0.45 slope of upstream face (Z:1) 2:1 tc (min) 5 slope of barrel (Sb) 0.50% 1 2yr 5.2 Q 2yr 14.1 length of barrel in saturated zone (Ls) 22.96 1 25yr 7.5 Q 25yr 22.4 number collars required 2 dimension of permanent collars 3.1'x3.1' principle spillway: available head (ft) 1.00 emergency spillway: Yes diameter riser (in) 48 required capacity (Q25-Qp) (cfs) 0.0 spillway capacity, Qp (cfs) 40.0 bottom width (ft) 50 diameter trash rack (in) 72 slope of east channel (ft/ft) 33% barrel length (ft) 64 minimun length of e)at channel (ft) 6 head on barrel through embankment (ft) 6.75 crest of spillway (ft) 358.66 diameter of barrel (in) 24 APPROVED Sediment Trap #2 Design drainage area (acres) (<3) 1.26 trap Volumes: � 1'1 .VARIABLE.• I elevation (ft) area (sf) volume(cf) volume(cy) I I I 368.00 432.0 0 0.0 ORIGk4L CREST OF STONE WEIR `IARIABLE" GROUND 370.00 660.0 1,084 40.1 ELEV. 372.00 921.0 2,658 98.4 374.00 1538.0 5,091 188.5 DRY STORAGE - N c VARIABLE 376.00 2282.0 8,886 329.1 378.00 3135.0 14,281 528.9 WET STORAGE 4' MAX. (EXCAVATED) CLOTH ORIGINAL ,FILTER GROUND ELEV. wet storage: wet storage required (cy) (67*DA) 84.4 SEE PLATE 3.13-1 COARSE AGGREGATE•• CLASS I RIPRAP bottom of stone weir (ft) 372.00 wet storage provided at this elevation (cy) 98.4 slope of wet storage sides 1:1 weir length (ft) (6)DA) 7.6 dry storage: bottom of trap elevation (ft) 368 dry storage required (cy) (67*DA) 84.4 bottom trap dimensions: 43'x10' crest of stone weir 377.00 top of dam elevation (ft) 378.00 dry storage provided at this elevation (cy) 330.6 top width of dam (ft) 5 slope of dry storage sides 2:1 top trap dimensions 75'x42' SCALE 1 "=30' J r� J Q M L9rl z ti LU M - C z N 94 z LU,-, 0 c Q Q � W z J ZD 0) N Q N Q J Q > U 2: 016 ZLLI J � > J \J LU F LU ~ LU O 2!0 0� LU J 0 L� I W Q z � Q O LU U � J � U) Ul � z 1-1 LU LU H� Z w O 0 1. SET POSTS AND EXCAVATE A 4'X4" 2. STAPLE WIRE FENCING TO THE POSTS. w TRENCH UPSLOPE ALONG THE LINE U)OF POSTS. i 66 LU FLOW IiI� 4» I�� II � 0 r 1 LL.I 6.�9+ - N 3. ATTACH THE FILTER FABRIC TO 4. BACKFILL AND COMPACT THE QZ ATTACH FILTER FABRIC THE WIRE FENCE AND EXTEND EXCAVATED SOIL. TO STAKES OR POSTS & EXTEND IT INTO TRENCH IT INTO THE TRENCH. WOODEN STAKE OR STEEL POST LENGTH = 5' MIN. U 5Q w ` LU to EXCAVATED SOIL T 'f J� JOB NO. BACKFILLED COMPACTED AND (� l � 172131 -uu-i IIIII u = - FLOW - IIiI=1111=1111 ((r =III SCALE 4"x4" TRENCH SILT FENCE EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. AS SHOWN SF (WITHOUT WIRE SUPPORT) 05-2 SIL T FENCE S HEETT NO. NO SCALE S (WITH WIRE SUPPORTS 05-2 ,r AMENDED POST -DEVELOPMENT SWM PLAN: - __ _ - \ i ��_ - SCALE 1 "=80' V A \ A - _ - FEDE-RAL-0AM BREAK 196-WP- STRE --MN-DATION ZZO E� �_ �� �-� P S `StEEP ) 7LOPE�TYP. --------- -- 37 R D T NTIONLL - / Q�P V DE WATER ;/ A T T EA E ONLY ° - -- - - o a: Xx • I I \ X _ / \\ \\ \ /� -THE I - I I I I � /\ //\ \ � `. \ �I•_ - a / / I' BOUNDARY IMSTUSED DIOSTUDEFINE CTHE VRRM BOUNDARY FOR SWIM WATER QUALITY CALCULATIONS. SEE SHEET p• I \/ / / / / \ 1 I 4B FOR FULL DEPICTION OF ESC 1 I ! ( Iff - i, LIMITS OF DISTURBANCE. 1 \ AMENDED DAB CN=83.3 • I I s. O - Tc 0.10 h r r I ° t- c� \ \ � G3 \ i APPROVED DA A \ \\\ \\ \\ \ o 6.02 ac. I G3 C CN=84.4 - �y / Tc- 0.10 hrs. \ \\ \ \\\\ \\ FE U1VA�iVM ZRAfd \ \ VAV A� \ \ \ \ T I� s \ - � as \ \ II T -- --- Nk I I �2 � � � • ., V� � ,,- ., r., �'A N PARCEL LIMITS \ \ TYP. �' \� • �` x ��\\V A � l • ' 'AN�O E E �I E - - _ J \A E�STEE \ \ �O R V PLS, TYP. / \ QUAL� ATM \ -41 L\��,�� �, = /� -DEVELOPM /,/ APPROVED PRE ENT SWM PLAN: � SCALE 1 =80 \ l /O• 0 \ A FEDERAL -DAM BREAK �y _ / \ 1A6`-W� R_ - I NttNflATI ON ZD1� E� �A� P �S 5 pi / / - U� ,-T1 Pr - =s6c / JL E� - \ i / \i\ - -- � 37o-�i� J7-7 PPI / /A __ / III \/LO�ATION OACILI�z / _� \�✓ //� \ / \ / \ / /\ / / /0 •' I I / / /0 �i / / • goO== ARPRQVED_DP $�� / I I l i • I I I I I / / \ \ \ / // \ \ A EA�JPL I3 6F SSA / / I THE ESC LIMITS OF DISTURBANCE I /\ / . \ /C �• \ / \ \ / BOUNDARY IS USED TO DEFINE THE FFEFYTE��kO ��\\� O VRRM BOUNDARY FOR SWIM WATER \T BE E) QUALITY CALCULATIONS. SEE SHEET / / \ / / /S3/ / \ - '-- \ _-- �j I I II LIMITSROFUDISTLL DURBANCE OF ESC 10�' OF\ O�F % 0=16 I(Tc 0.10 hls.)I \\ 0 o C7 635' OE CF w =77 (Tc 10.03 h S.) 1.\I 90 Y00' OF OJ J �-1�' �Tc 0. 9 hrs. E C�� 84'(T 0. 4 hrs. \ \ FEDERAL [YAM BREA \IN1NDATIOZONi= LO ATION\,Ol` PRR EDII I I -46 /A 9 _ / I A \VA\\ \ CN=64.2 i \�\ \ \ Tc= 0.13 hrs. \Or \\ \ • �-PARCEL LIMI'i5, \\ I \\ �. A\ TYP. General Construction notes for Stormwater Management Plans =31 \ \\\\ \ \ \ \ \ 1. All dams and constructed fill to be within 95% of maximum dry \ I of �� density and 2% of optimum moisture content. All fill material to S A \ VA \VA \ II ��\ AAPIAE�EE`P be approved by a geotechnical engineer. A geotechnical engineer is PES, TYP. to be present during construction of dams. AO\ 2. Pipe and riser joints are to be watertight within stormwater management facilities. -41 _ �� 3. For temporary sediment traps or basins which are to be converted / o• \ / , \\ \ I I (( / to permanent stormwater management facilities; conversion is not to take place until the site is stabilized, and permission has been - \ �\ 33 �� -�� \ \�` \V ■ / 1 I \ obtained from the County erosion control inspector. STORMWATER MANAGEMENT NARRATIVE: OVERVIEW THIS PROJECT IS FOR THE DEVELOPMENT OF AN APARTMENT COMPLEX, AND ITS ASSOCIATED INFRASTRUCTURE. STORMWATER TREATMENT IS PROVIDED TO MITIGATE THE IMPACTS FROM THE PROPOSED IMPROVEMENTS. THE STORMWATER MANAGEMENT PLAN COMPLIES WITH PART IIB SWIM REQUIREMENTS. WATER QUALITY SUMMARY THE PROPOSED DEVELOPMENT REQUIRES A TOTAL PHOSPHOROUS REMOVAL RATE OF 13.17 13.60 Ibs/yr. THE STORMWATER QUALITY REQUIREMENTS FOR THIS DEVELOPMENT ARE MET THROUGH TWO BEST MANAGEMENT PRACTICES. THE BEST MANAGEMENT PRACTICE OF INSTALLING A LEVEL II WET POND TREATS MORE THAN HALF OF THE PROPOSED IMPROVEMENTS. THE LEVEL II WET POND PROVIDES A PHOSPHOROUS REMOVAL RATE 6.93 Ibs/yr. THE REMAINING WATER QUALITY BALANCE OF 6.2 6.68 Ibs/yr OF PHOSPHOROUS WILL BE MET VIA THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS. WATER QUANTITY SUMMARY THE PROPOSED LEVEL II WET POND (DA A) CAPTURES MORE THAN HALF OF THE PROPOSED IMPROVEMENTS & ATTENUATES ITS SUBAREA's RUNOFF. A SIGNIFICANT PORTION OF THE REMAINING PROPOSED IMPROVEMENTS RECEIVE WATER QUANTITY TREATMENT IN SUBAREA B. SUBAREA B RECEIVES ATTENUATION IN A PROPOSED DRY DETENTION CELL (DA B) FOR WATER QUANTITY TREATMENT. THE PROPOSED PLAN COMPLIES WITH MINIMUM 9 VAC 25-870-66 REQUIREMENTS. PLEASE SEE THE ATTACHED CALCULATIONS PACKET FOR EVIDENCE OF THIS PROJECT's CHANNEL AND FLOOD PROTECTION COMPLIANCE. Existing Impervious Area Summary (DA A- Water Quantity) Existing Gravel Access 2,250 sf Proposed Impervious Area Summary (APPROVED DA A, Water Quantity) Proposed Buildings 52,750 sf Proposed Pool & Community Space 11,475 sf Proposed Sidewalk 14,925 sf Proposed Parking & Access 86,475 sf 165,625 sf Proposed Impervious Area Summary (AMENDED DA B, Water Quantity) Proposed Buildings 46,175 sf Proposed Sidewalk 16,775 sf Proposed Parking & Access 82,450 sf Proposed Garages 3,650 sf WATE SHED SUMMARY APPROVED Subarea A CN Area, ac. 149,050 sf 1-year Flow, 2-year Flow, 10-year cfs cfs Flow, cfs APPROV D DA A (Pre-Dev.) 64.2 7.62 4.49 8.04 20.87 APPROV D DA A (Post-Dev.) 84.4 6.02 0.92 2.85 13.23 AMENDED Subarea B CN Area, ac. 1-year Flow, 2-year Flow, 10-year cfs cfs Flow, cfs APPROV D DAB (Pre-Dev.) 60.6 4.09 1.55 3.09 9.29 AMEND D DA B (Post-Dev.) 83.3 5.69 0.30 4.81 20.86 Total Ara Summary Pre -Development DA A & B 11.71 ac. Post -De elopment DA A & B 11.71 ac. Total Proposed Impervious Area Summary Water Qualit Proposed Buildings 98,925 sf Proposed Pool & Community Space 11,475 sf Proposed Sidewalk 38,025 sf Proposed Parking, Garages & Access 177,975 sf 326,400 sf - SCOTT R. COLLINS'Z ,,J No. 35791 1�0�Als��IONAL E�O� Zz O J OE2 U m w VZ)i 0 J z Q O c!� z W w Ce 0 Lu N Q M z � w ® M o N Z M CW N o z 04 Q N N J W Q z > Q W J J > I z v / , /� W L9� W z O w Q _ � Q Ll LU Q w J Q Q U W (n � O LU = cn ® U z O J W (n w V o w o r-n N Q 2 U L.V H Q �� w Uu a � JOB NO. 172131 SCALE AS SHOWN SHEET NO. 6 STORMWATER MANAGEMENT FACILITY GRADING Elevation (ft) Area of Forebay Cell Contours (sf) Volume (Cf) 376 505 0 378 1,534 1,946 379 2,187 3,797 380 2,933 6,348 382 - - 384 - - Elevation (ft) Area of Wetland Cell Contours (sf) Volume (Cf) 376 - - 378 - - 379 328 0 380 878 581 382 - - 384 - - PROPOSED 2' WIDE FOREBAY CONSTRUCTED OF GABION BASKETS FILLED WITH VDOT CL. Ai STONE. TOP OF FOREBAY DAM ELEV. IS 38o'. FOREBAY TO INCLUDE A io' WIDE, i' DEEP WEIR TO CONVEY FLOWS TO THE WETLAND CELL. FOREBAY WEIR CREST ELEV.=379.0'. 390 Elevation (ft) Area of Main Cell Contours (sf) Volume (Cf) 376 177 0 378 1,089 1,137 379 2,197 2,748 380 4,500 6,028 382 - - 384 - - PROPOSED 2' WIDE FOREBAY CONSTRUCTED OF GABION BASKETS FILLED WITH VDOT CL. Ai STONE. TOP OF FOREBAY DAM ELEV. IS 380'. FOREBAY TO INCLUDE A 1o' WIDE, 1' DEEP WEIR TO CONVEY FLOWS TO THE MAIN CELL. FOREBAY WEIR CREST ELEV.=379.0'. Elevation (ft) Total Facility Area Contours (sf) Volume (Cf) 376 682 0 378 2,623 3,095 379 4,712 6,712 380 8,311 13,139 382 14,412 35,584 384 20,500 70,317 EMBANKMENT NOTES: AFTER AN INVESTIGATION OF THE SITE's SOILS, SITE VISITS, AN ANALYSIS OF THE SURVEYED TOPOGRAPHY AND AN EXAMINATION OF VA DEQ APPENDIX A: EARTHEN EMBANKMENT (REQUIREMENTS vs. RECOMMENDATIONS THE APPLICANT HAS PROVIDED A COMPREHENSIVE EMBANKMENT DESIGN THAT DOES NOT NEED A GEOTECHNICAL STUDY AT THIS TIME. SUCH IS THE CASE DUE TO THE PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS ARE LISTED BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT MINIMUM. THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON THIS SHEET. BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC-3 MATTING WHERE RIPRAP IS NOT PROPOSED, AND THE REMAINING DISTURBED SLOPES SHALL BE STABILIZED WITH EC-2 MATTING. ALL ADDITIONAL BERM FILL MATERIAL SHALL CONSIST OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR ANY OTHER NON COMPACTING SOIL. COMPACTED FILL SHALL BE PROCTOR MAXIMUM DRY DENSITY ASTM D698 AND HAVE A MINIMUM OF 95% OF MAXIMUM DRY DENSITY AND 2% OF OPTIMUM MOISTURE CONTENT. ALL FILL MATERIAL AND PROPOSED CONSTRUCTION SHALL BE APPROVED BY AN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS. 390 --PROPOSED M SE= 380 0' / (PERMA NENT POOL DEPT =4') ESC RIS R FOUN ATION LOWER PORTIO OF ITS 48" CL. III RCP TANDPI E PROPOSE D10' (ESC RIM ELEV =381.25) TO REMAIN. CONTRACT R SHALL MODIFY THE TOP 385 WIDE OP OF PORTION OF THE ESC RISER TO HAVE A VDOT MH-1 UPPER CONE. CO TRACT R 385 DAM EL V.=384' INSTALLING THE MH- FRAME & COVE . SWM FACILITY EW RISER RIM WETLAND ELEV.=381.75'. CONTRA OR SHALL PLUG, WATERTIGHT, T E ESC CRIFICE & CELL INSTALL. ONE NEN 06" LC W-FLO ORIFICE (INV.=3 0.00) ITH A T ASHRAC XISTING PROP SED 10' -- WIDE TOP OF 380 GRADE P DAM E EV.=38 '. 380 s PROPOSED io' WI E,12" �f MA L DEEP AQUATIC BENCH E CELL FOREBAY VALVE CELL TO SER E AS A DEWATERING ORIF CE. VALVE TO BE IN THE 375 F POSITION DURING NOR AL OPERATIONS. VALVE 375 HANDLE: HANDL TO BE LOCATED T THE RISER'S IM ELEVATION OR JL ST BELOW IT. VA VE / ORIFICE OPENING T6 BE PRO OSED \ LOCATED AT THE BOTTOM OF THE POND, INVERT ELEV = GR6,DE 376.00 VALVE / ORIFICE OPENING COINCIDES WITH THE PRO OSED 4' EEP (FLOOR FOREBAY ELEV. 376') INV. OUT= S OULD THE FACILITY NEED TO BE DRAINED. 370 72.50' 370 ONTRA TOR SH LL INS ALL A OMPAC ED CLAY CORE w/ A \ C TOFF TRENCH. EIMBANK ENT TO BE IN ACCORDANCE w THE D SIGN SHOWN 04 THESE PLANS. STR:SWM MH 365 30" CL. III RCP MODIFIED VDOT MH-1 365 101.05 LF @ 8.4170 TP=369.62 _�77\INV INV IN: 364.00 TO 10 OUT: 360.00 TO WET PO qD, RISER FOUNDATION NOTE: TO REDI JCE THE RISK OF LOATAT 360 ON, RIS =R BASE 360 & BARR L CONNECTION SHALL BE FIRMLY EMBED CONCRETE ED 6" IN FOUN TO AN 1 ATION " THICK HAT IS REINFORCED 'x8' & BURIED \ OUTSID THE LIMITS OF THE POO ED WATER. 355 355 350 < 350 Ss o 345 345 \ 340 RIPRAP CHANNEL I ESIGN REQUIREMENTS: 340 STING GRADE. 2. CONTRACTOR SHALL INS ALL A CLASS II FILTER FABRIC UNDERLAYMENT MEETING MINI UM REQU REMENTS SET FORTH IN TABLE 3.19-D OF THE ESCH STANDARD & SPE _-IFICATIC N 3.19. F LTER FABRIC SHALL BE KEYED INTO TF E EXISTING GROUND A MIN MUM OFT' AT ITS ENDS & A ONG THE ENTIRE PERIMETER. 3. PLACEMENT OF =ILTER FABRIC SHAL BE DO E IMMED ATELY AFTER SLOP 335 PREPARATION. EDGES OF THE FILTER SHEETS SHALL OVERLAP AT LEAST 1 ". 335 FILTER. RIPRAP SHALL BE PLACED SO THAT IT PRODUCES A DENSE WELL -GRADED MASS OF STONE: WITH MINIMAL VOIDS. THE FINISHED SLOPE SF ALL BE FREE OF POCKETS OF SMALL STON E OR CLU TERS OF LARGE S ONES. D= Q,o 17.09 s 330 V,o 10.55 f S 1' 330 D,o 0.71 FT RIPRA SWAL NO SCAL 325 PROPOSED V OT STD. CL. III IPRAP 325 4.25' THICKNE S WIT CLASS I FILTER FABRIP UNDERLAYMENT THAT 15 KEYED INTO THE EXISTING GROUND A IV INIMUM OF 9" ALONG IITS ENTIRE PERIMETER 320 I I 320 315 315 312 312 J Ljj O LO 00 CIO CO N N O M Cfl Co O J w w 00 4 � Cn Ln CO Ln r I- r� co r� co r� c r� NO r> CD K) L(� h7 N W LOi 0+50 1 +00 1 +50 2+00 2+50 3+00 3+50 PROFILE SCALES: WET ET POND SECTION 1"=50' (H) 4+00 4+50 5+00 5+25 LEVEL II WET POND DETAIL: SCALE 1 "=30' / X e Z / ZZ X 10' WIDE, 1' DEEP WEI / `� IN GABION BASKETS / CONVEY FLO T / �_OVERHEAD WE CE , EIR ELECTRIC LINES CREST L =3 9' / / P SERVED STEE LOPES, TYP. 100-YEAR �� / FLOODPLAINr' i' LIMITS, TYP. PROPOSED 10' WIDE TOP OF DAM ELEV.=384'. LEVEL TOP OF DAM TO SERVE AS ACCESS FOR SWM MAINTENANCE. 2' WIDE INTERIOR DAM C NSTRUCTED OF GABION BASKETS WIT STONE TO w // CONVEY FLOWS TO MAIN ELL VIA / OVERTOPPING. TOP OF DAM LEV.=380', BOTTOM OF GABION BASK TS TO BE / ANCHORED AT ELEV. 3 5.00 \ TO REDUCE THE RISK OF F OATATION, ASE & BARREL _/ RISER I RFIRMLY 0ILL BERML EMBEDDED6'I TO AN 18" 07800-0 \o XTHIREINFORCED FOUNDATION A�E_ THAT IS 8'8'& BURIED OUTSIDE THE_WEI LI wr _\ LIMITS OF THE POOLED WATER. / o A �c�E �� _DEVELOPMENT COMPANY-LC—�� � - i - .63-\ � PROPOSED ESC 030" CL. III 3� I - RCP BARREL T6-RE 11 A N. / I PROPOSED VDOT STD- CL II- \ RIPRAP (4.25' THICKNESS) W �� �/ \ 3 00 CLASS IIFILTER FABRIC I 0 UNDERLAYMENT THAT IS KEYE INTO THE EXISTING GROUND- " v � —1— I j" MINIMUM OF 9" ALONG -ITS\ I ENTIf�E PERIMETER J CONTRACTOR SHAL IN TALL A ODIFIED MH- AT THE PROPOSED SC UTFAL CONTRACTOR k 4+0 7 I I SHALL THEN INST L EW op 0" CL. III RCP I I I BARREL TO EXTEND TH UTFALL BEYOND THE I T?I J � J l EXISTING \ I I I I LIMITS OF TH EX ST7G �"WAY. HEADWALL I I II \ i� ARCEL LIMITS, PEId 9VAC25-870-66 THE LEVEL II WEI POND \ 048" CL. S II RCP STANDPIPE E (ESC ERIM ELE . 38 I25 ) OUTF LL ANALYSIS ENDS AT THL FACILITY DUE TO \ \ \ TO REMAIN. CONTRACTOR SHALL MODIFY THE TOP l PORTION OF THE ESC RISER TO HAVE A VDOT MH-1 COMPLIANCE WITH THE',ENE GY BALANCE\ \ \ � � 1 I CALCULATIONS && HAVING A POST -DEVELOPMENT \ UPPER CONE. CONTRACTOR SHALL INSTALL A \ \ v 10-YE R FLOW LESS THAN THE CORRESPONDING \ \ \ \ TRASHRACK OVER THE CONE's 024" OPENING \ \\ I I �10-Yi AR PRE -DEVELOPMENT FLOW. \ \ \ INSTEAD OF INSTALLING THE MH-1 FRAME & COVER. SWM FACILITY NEW RISER RIM ELEV.=381.75'. 1 \ 1 I II I 1 I \ \ \ CONTRACTOR SHALL PLUG, WATERTIGHT, THE ESC 1 I \\ 11 ( I \ \ \ ORIFICE & INSTALL ONE NEW 06" LOW -FLOW ORIFICE 1 I(INV.=380.00) WITH A TRASHRACK. � \ I- \ PUBLI W I I \ \ \ \ \ I \ I 10' WIDE, 1 \'/DEEP WEIR 1 GABION BASKETS TO CONVEY I I I \ \ \ FLOWS TO M IIN CELL, W IR C EST E EV.=3' \ \ \ \\ PRESERVED STEEP OPOSED 100' WIDE DOT CL. A1, / \ \ \ \ \\\\ \ SLOPES, TYP. EMERGENCYC-1,RIPRAP LINED SP LLWAY CREST ELEVATIN= 3 2.75'. ILLWAY TO HAVE 4:1 SIDE SLOPES � \ I CONTRACTOR SH�LL USE UTRIENT RICH SOIL FOR THE \ \ \\\ \ \\ \ 722 A AQUATIC BENCH & SHA L ENSURE / H EALTHY GROWTH OF P ANTIIN S / MADURING THE FIRST YEA (TYP.) NAGED STEEP / 1 I 1 I \ 1 I I I ES, TYP. I I I I I I 11 Ii I \ I j; PROPOSED I VAR WIDTH I I I I DRAINAGE & SES,MT. I I I I I\ I I \ I INUNDATION ZON , FEDERAL DAM I I I I I I I I I I TYP. II I I £C'TION A-9: TYPICAL RAPMC -L DET�iIL S HgMQQq PW5 fill 4' min DA off trench-4'' below 9u(table ! dal of mk L=_��-------� TYPICAL HOMOGENEOUS EMBANKMENT Trans It1w 1fill Rock or grovel , -... --- rour% slots Perfaraed oallec4ar o F-Dundation drain �Snkei droin FOUNDATION DRAIN BLANKET DRAIIN druin Sqn�p WaY6 ors Rock or gravel Rbd tm dr& �Trunsikian filler I;Iter CHIMNEY DRAIN TOE DRAIN Figunp A-U. Entbailiftapas }kf_S'eepage Controls GENERAL SWM NOTES: 1. STATE APPROVED TRASH RACKS AND ORIFICES SHALL BE INSTALLED ON ALL ORIFICE OPENINGS. SEE DETAILS ON THIS SHEET, OR EQUIVALENT. 2. CONCRETE FOUNDATIONS SHALL BE INSTALLED ON ALL RISER STRUCTURES MEETING MINIMUM VESCH 3.14 SPECIFICATIONS. 3. CONTRACTOR SHALL HIRE A THIRD PARTY GEOTECHNICAL ENGINEER TO ENSURE THE EMBANKMENTS ARE STRUCTURALLY SOUND. THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON THIS PLAN. 4. THE DOWNSTREAM EMBANKMENT SIDE SLOPES OF ALL PERMANENT FACILITIES SHALL HAVE A MAXIMUM 3:1 SLOPE. WET POND DESIGN & REQUIREMENTS: Treatment Volume, TV (VRRM) 14,716 cf Minimum Treatment Volume Required for Level I I Basin 22,074 cf Treatment Volume Provided at MWSE 13,139 cf Minimum Percentage of TV Provided at MWSE 50 Percentage of TV Provided at MWSE 60 Ponding Depth Corresponding to Minimum TV Required 0.8 ft Maximum Ponding Depth allowed for Minimum TV 4 ft Maximum Percentage of Tv Provided above MWSE 50 Percentage of TV Provided above MWSE 40 Forebay Volume Required (0.25"/Imp. Ac.) 3,451 cf Forebay Volume Provided 6,348 cf Minimum Wetland Shelf Area (10% of Pond Area) 831 sf Upper Wetland Shelf Area Provided 878 sf PROPOSED 100' WIDE VDOT CL. Al, EC-1 RIPRAP LINED EMERGENCY SPILLWAY CREST ELEVATION= 382.75'. 385 SPILLWAY TO HAVE 4:1 SIDE SLOPES 385 380 380 100' PROPOSED GRAD XISTING GRADE 375 375 Li w CAI L,) N O W W O N N N N O 4 cC) cc) L00 w li 0+50 1 +00 1 +25 WET POND SPILLWAY PROFILE SCALES: 1"=5, (V) 1"=5o' (H) AQUATIC BENCH (ZONE 1) PLANTING SCHEDULE FOR SWM FACILITY SYM BOTANICAL COMMON NAME SIZE SWM FACILITY QUANTITY COVERAGE (sf) ZONE 1 PLANTINGS PC PONTEDERIA PECTINATUS POND WEED - - 600 VA VALISNERIAAMERICANA WILD CELERY - - 925 EC ELODEA CANADENSIS WATERWEED - - 1,300 I R�i�aalf"Yi�•�'fi';IJ - r r �i 1 I MAIko u, S C I CEL� I� y Z N N ' I 1 a 9z47 � I LEVEL II WET POND LANDSCAPING DETAIL: SCALE 1 "=30' 0 LA.) J 0 / 0° w w 00 I� I I SUBJECT PROPERTY; TYP. � � C A FEDERAL t MINU DAT�IQ N NE, TYP. I 10' WI E, 1)2" DE`EP I QUATIC BEN PROPERTY LINE, TYP. / M�NAGED STEEP SLOPES, TTYR. NAD83 / RETAINING WALL NOTE: NO CANOPY OR UNDERSTORY TREES SHALL BE PLANTED WITHIN TEN (10) FEET OF THE BACK OF THE TOP OF THE RETAINING WALLS. 475 Sfl I# VA z25 ST OFE I 1251sf OFV I 125 sf I I OFP LANELL ' MIN 111 S��E- IWO _100X­ O SCOTT R. COLLINS'Z J No. 35791 ZONAL E� Zz O J � O iY w m 0 vim) J z O Q in z LUw Ce O I--- N Q M Nt rl z C Cw G ® 00 0 N z M LLl Q N o z N Q N J W Q � > LU Lr) J (n _j J > J � LnLLI - ~ z a LU L 7 O 2 ~ � U � M Q w LU Q F____ J D Q Lu U > LU ,�^ W V 1 J mow/ O U z JF___O LU U) LU J Q LL 0 o w o r-, N Q LL LU H Q LU LU a JOB NO. 172131 SCALE AS SHOWN SHEET NO. 7 DRY DETENTION CELL DETAIL; SCALE 1 "=30' - / --- 9.0' PROPOSED DOT STD. AT ( CL. RIPRAPOLIINED OUTLET / \ / 3+39 ' PROTECTION. WIDTH AT FLOODPLAIN=14' o � � / ' a a WIDTH AT PIPE OUTFALL=10'. SEE THIS \ SHEET FOR ADDITIONAL NOTES & - / V % INSTALLATION REQUIREMENTS. / O N - THE DRY DETENTION CELL IS INI COMPLIANCE WITH MINIMUM 9VAC25-870-66 REGULATIONS. CHANNEL \ � BALANCE CALCULATIONS). FLOOD PROTECTION IS MET VIA ` / PROTECTION IS MET VIA SUBSECTION B.3 ENERGY ______ SUBSECTION C.2.a (CONFINES THE POST-D€V. 10-yr FLOW 100-YEAR A / WITHIN THE DETENTION CELL & RIPRAP CHANNEL)-WITI -A FLOODPLAIN LIMITS OF ANALYSIS SET VIA SUBSECTION C.3.c o (DISCHARGES TO A MAPPED FLOODPLAIN). L0 ---- / \ PROPOSED OUTFALL SYSTEM, SEE_. PROFILE ON THIS SHEET FOR DETAILS. O e� �STR 502 \ X �- CONTRACTOR SHALL INSTALL A VDOT MH-1 WITH A RIM ELEVATION OF 35�1.33' 357.50'. A TRASHRACK SHALL BE NSTALLED OVER THE MH-1's UPPER 24" OPENING f 'U INSTEAD OF A MH-1 FRAME & COVER. RISER TO - - H tLUDE A 0 � 2- 16 " LOW -FLOW ORIFICE WITH AN - � �� ERT 352.00. / TO REDUCE THE RISK OF FLOATATION, _ ��. /,�///� / RISER BASE & BARREL CONNECTION SHALL BE FIRMLY EMBEDDED 6" INTO AN 18" C` \ THICK REINFORCED CONCRETE FOUNDATION / 50' WIDE VDOT CL. Al, EC-1 RIPRAP \ THAT IS 8'x8' & BURIED OUTSIDE THE \ \ LINED EMERGENCY SPILLWAY CREST �F _LI-MITE-THE EXCAVATION - STR 504 \/ /ll /j/ 1 /\ \ ELEVATION= 358.66'. SPILLWAY TO % \ / HAVE 4:1 SIDE SLOPES VAR. WIDTH - DRAINAGE &SWM / ;� \ / - / //; // , APPROVED 10' WIDE TOP OF ESMT. COINCIDES - � / Z9F \%/ \ DAM ELEV. =360'. LEVEL TOP �� J/,� A \ OF DAM TO SERVE AS ACCESS WITH PROPERTY LINE FOR SWM MAINTENANCE. RECORDED PUBLIC \\ APPROVED RIPRAP ` \� FACILITIES & ACCESS --LINED ENERGY 00 EASEMENT FOR SWM \/ DISSIPATER. \ (DB 5276 PG 400-409) - N \ \ ROPOSED'XPANSI\QN \� CONTRACTOR SHALL REMOVE N TO THE P PUBLIC �A SEDIMENT LADEN MATERIAL FROM - THE SEDIMENSIN & SHALL FACiiTIE / �REGRADE�THE BASIN TO THE �G \ �ASEMEN�FOfACCESS FOR PROPOSE D'CONTOURS SHOWN_ON- THI7SVIPLAN AT THE TIME OF THE \ \ 'FACILITY'S CONVERSION. \ ��' 3648141 \ ' NAD89 /V \ AT THE TIME OF TEMPORARY SEDIMENT BASIN \\ #2's CONVERSION TO A PERMANENT SWM \ \ FACILITY, THE CONTRACTOR SHALL UNPLUG \ o� \ - THE LOW -FLOW ORIFICE, INSTALL THE \ �j \ \ p�rG LOW -FLOW ORIFICE's TRASHRACK, REMOVE /// LL THE TEMP. 048" ESC TRASHRACK, INSTALL THE �\ 47LE\ \ / / UPPER SECTION OF THE MH-1 (FINAL RISER / O- RIM ELEV.=357.50), INSTALL THE PERMANENT � � 024" RISER TRASHRACK &PERMANENTLY PLUG \ \ \ ° , WATERTIGHT THE ESC DEWATERING ORIFICEool 00 /O CID LL / C� StormRaxTlA FOUND SERIES TRASH RAID (OR EQUIVALENT) CONCRETE MANHOLE STANDARD 60 INCH RACK SHOWN DIMENSIONS IN INCHES PLAN / * CONTRACTOR SHALL INSTALL THE STORMRAX ROUND SERIES TRASHRACK WITH AN ANTI -VORTEX DEVICE, OR EQUIVALENT, TO ON THE RISERS FOR THE WET POND & THE DRY DETENTION CELL. ** CONTRACTOR SHALL INSTALL THE STORMRAX ROUND SERIES TRASHRACK WITH AN ANTI -VORTEX DEVICE, OR EQUIVALENT, ON THE TEMPORARY SEDIMENT BASIN's RISER PLAESrnOLU-11Ai PLAS11CQ5` f RL+snC sctiurrow s, IHC_ I + .` I 'I I .I I I I 'I L , ".a I I I� �Ir i t h a F SIDE VIEW Storm Rax"I Round Series for Ccricrete Marlhcle Part No. DIm A4 Dim B DO C Min ID MI n O0 RS-24 17Y4 14M, 28 - 24 30 ks-36 21 X 14 40; M 43 RS 4$ 27 Y, 19 54 49 57 FLr50 27 18 fib 60 74 Plastic Solutions, Inc. CUSTOMER: PO Baas 43W. WIndhcster, VA 22604 33$ McQkmm Rd, VIAnOmmer, VA Z2b03 UkM 977-9727 Owme PROJECT- Umc� 722-27-19 fox h tt� {{www. p I asif efsaG� tloai , €am ❑4.P1irER SECII9N REMOv.{BLE tOR AOCESS ISDhAETRI CONCRETE STRUCTURE DIMEN94ONS INSIDE STRUCTURE DIMENSION OUTSIDE STRUCTURE DIMENSION AVAILABLE OPTIONS CROSS 6RAC ING FOR OVERHANG HDPE ANTI -VORTEX PLATE (REQ'D) GATE: DRAWN BY: APPE EV: DEVIL'. APPROVED DRY DETENTION CELL CONSTRUCTION NOTES: FACILITY PLANTING SPECIFICATIONS: 1. THE DETENTION BASIN SHALL HAVE TURF GROUND COVER, SUCH AS GRASS, MULCH OR SOME OTHER FORM OF A VEGETATIVE GROUNDCOVER. LANDSCAPING BEYOND THIS IS OPTIONAL AND IS NOT REQUIRED. 2. THE PROPOSED SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 4:1 TO REDUCE THE RISK OF EROSION. THE PROPOSED FLOOR SLOPES SHALL BE GRADED TO PROVIDE POSITIVE DRAINAGE AT ALL TIMES TO THE RISER STRUCTURE. 3. WOODY VEGETATION SHALL NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET OF THE PRINCIPAL SPILLWAY STRUCTURE. 4. A VEGETATED BUFFER SHALL BE PROVIDED THAT EXTENDS AT LEAST 20 FEET OUTWARD FROM THE BASIN TOP OF DAM ELEVATION. PERMANENT STRUCTURES (E.G., BUILDINGS, SHEDS, etc.) SHOULD NOT BE CONSTRUCTED WITHIN THE BUFFER AREA. EXISTING TREES SHALL BE PRESERVED IN THE BUFFER AREA DURING CONSTRUCTION IF AT ALL POSSIBLE. 5. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY THE DENSITY OF THESE COMPACTED SOILS CAN BE SO GREAT THAT IT EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHOULD BE THREE TIMES DEEPER AND WIDER THAN THE DIAMETER OF THE ROOTBALL FOR BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR CONTAINER -GROWN STOCK. 6. AVOID SPECIES THAT REQUIRE FULL SHADE, OR ARE PRONE TO WIND DAMAGE. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS. CONTRACTOR REQUIREMENTS: 1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS. 2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL INFORMATION. THE CONTRACTOR SHALL ABIDE BY ITS CONTENTS; HOWEVER ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE THOSE OUTLINED IN THE SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FOR A FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA NURSERYMEN'S ASSOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS). 3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY STOCK, PUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005. 4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN. 5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY EXCAVATION). 6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE INFORMATION. 7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES. 8. PLANTS WILL BE PREPARED FOR SHIPMENT IN A MANNER THAT WILL NOT CAUSE DAMAGE TO THE BARK, BUDS, BRANCHES, STEMS, OR OVERALL SHAPE OF THE STOCK. CONTAINER GROWN PLANTS WILL BE TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE GROWN. 9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE HEALTHY, VIGOROUS, AND FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. ALL PLANT MATERIAL SHALL BE FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT. PLANTS DEEMED UNHEALTHY WILL BE REJECTED. 10. ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED SUFFICIENTLY TO HOLD ITS SOIL. CONTAINER STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED. 11. PLANTS NOT INSTALLED ON THE DAY OF ARRIVAL ON SITE SHALL BE STORED AND PROTECTED BY THE CONTAINER. OUTSIDE STORAGE AREAS WILL BE SHADED AND PROTECTED FROM THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL TIMES BY COVERING THE BALLS OR ROOTS WITH MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR MULCHING MATERIAL. 12. THE OWNER RESERVES THE RIGHT TO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BY THE INSPECTOR INITIALLY, AND THEN THE DESIGNER. 13. MINOR FIELD ADJUSTMENTS MAY BE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE APPROVED BY THE DESIGNER. 14. NO PLANTING SHALL OCCUR WHEN THE SOIL IS FROZEN. 15. PLANT MATERIAL SHALL BE PLACED IN EXISTING SOIL WITH EACH PLANTING PIT EXCAVATED TO A SIZE SUFFICIENT TO CONTAIN THE ENTIRE ROOT BALL OR ROOT MASS, WITHOUT CRAMPING ROOT STOCK. 16. THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 90% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. THE PERIOD OF CARE AND REPLACEMENT SHALL BEGIN AFTER INSPECTION AND APPROVAL OF THE COMPLETE INSTALLATION OF ALL PLANTS AND CONTINUE FOR ONE CALENDAR YEAR. 17. THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS. 18. THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIVITIES BEYOND THE CONTRACTOR's CONTROL. FACILITY CONSTRUCTION 1. THE DETENTION BASIN MAY SERVE AS A SEDIMENT BASIN AND/OR TRAP DURING PROJECT CONSTRUCTION. IF THIS IS DONE THE VOLUME SHALL BE BASED ON THE MORE STRINGENT SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENTS VS. STORMWATER TREATMENT REQUIREMENTS). INSTALLATION OF THE PERMANENT RISER SHALL BE INITIATED DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS SHALL BE SET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION POND IN MIND. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF TURBULENT WATERS WHEN THE BASIN IS BEING CONVERTED INTO AN DETENTION BASIN. FOR THIS DESIGN IN PARTICULAR, THE RISER, RISER FOUNDATION, BARREL AND LOW -FLOW ORIFICE SHALL BE INSTALLED AT THE TIME OF THE SEDIMENT TRAP's CONSTRUCTION AND SHALL REMAIN WATERTIGHT UNTIL THE TRAP IS CONVERTED TO A PERMANENT FACILITY. 2. THE DETENTION BASIN SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE POND IS COMPLETELY STABILIZED. IF THE PROPOSED POND SITE WILL BE USED AS A SEDIMENT TRAP OR BASIN DURING THE CONSTRUCTION PHASE, THEN THE FACILITY WILL BE DEWATERED, DREDGED AND RE -GRADED TO DESIGN DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE. 3. INSTALL E&S CONTROLS PRIOR TO CONSTRUCTION OF THE BASIN, INCLUDING TEMPORARY DE -WATERING DEVICES AND STORMWATER DIVERSION PRACTICES. ALL AREAS SURROUNDING THE BASIN THAT ARE GRADED OR DENUDED DURING CONSTRUCTION SHALL BE PLANTED WITH TURF GRASS, NATIVE PLANTINGS, OR OTHER APPROVED METHODS OF SOIL STABILIZATION. 4. CONTRACTOR SHALL EXCAVATE THE CORE TRENCH AND INSTALL THE SPILLWAY PIPE DURING THE ESC PHASE. 5. CONTRACTOR SHALL ALSO INSTALL THE RISER, OUTFLOW STRUCTURE AND/OR THE BARREL(s) DURING THE ESC PHASE TO ENSURE THE TOP INVERT OF THE OVERFLOW WEIR IS CONSTRUCTED LEVEL AT THE DESIGN ELEVATION. 6. THE CONTRACTOR SHALL THEN CONSTRUCT THE EMBANKMENT, AND ANY INTERNAL BERMS IF APPLICABLE, IN 8 TO 12-INCH LIFTS AND COMPACT THE LIFTS WITH APPROPRIATE EQUIPMENT. 7. UPON COMPLETION OF THE EMBANKMENT GRADING, THE CONTRACTOR SHALL EXCAVATE/GRADE UNTIL THE APPROPRIATE ELEVATION AND DESIRED CONTOURS ARE ACHIEVED FOR THE BOTTOM AND SIDE SLOPES OF THE BASIN. 8. CONTRACTOR SHALL THEN CONSTRUCT THE EMERGENCY SPILLWAY IN CUT OR STRUCTURALLY STABILIZED SOILS. 375 9. THE CONTRACTOR SHALL THEN FINISH CONSTRUCTION OF ALL OUTLET STRUCTURES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION. 10. THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS BY HYDROSEEDING OR SEEDING OVER STRAW. 11. THE CONTRACTOR SHALL THEN INSTALL THE APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS. FACILITY MAINTENANCE: MAINTENANCE OF THE DETENTION BASIN IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE FACILITIES. DURING THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRST YEAR FOLLOWING INSTALLATION, AND THE OWNER THEREAFTER: 1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE BASIN. 2. MONITOR THE GROWTH OF THE GROUNDCOVER AND ANY TREES AND SHRUBS PLANTED AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE AND NOTE THE PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE. 3. INSPECT THE CONDITION OF STORMWATER INLETS TO THE BASIN FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING. 4. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY GROWTH, OR GULLY EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY. 5. INSPECT BASIN OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, etc. 6. INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES. 7. INSPECT CONDITION OF ALL TRASH RACKS, REVERSE SLOPED PIPES OR FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION OR OTH FAILURES. 8. INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND LOCKS CAN BE OPENED AN OPERATED. 9. INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OF THE BASIN FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING. 10. OWNER OR CONTRACTOR SHALL MAKE NEEDED REPAIRS IMMEDIATELY. FACILITY INSPECTION: MULTIPLE INSPECTIONS ARE CRITICAL TO ENSURE THE BASIN(s) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION IS DICTATED BY THE CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO INSTALLATION. MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR WITH THE ENGINEER AND INSPECTOR DURING THE FOLLOWING STAGES OF THE DETENTION BASIN' CONSTRUCTION PROCESS: 1. PRE -CONSTRUCTION MEETING 2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS) 3. EXCAVATION/GRADING (e.g., INTERIM/FINAL ELEVATIONS) 4. EXTENDED DETENTION BASIN INSTALLATION (e.g., INTERIM AND FINAL ELEVATIONS) 5. INSTALLATION OF THE EMBANKMENT, THE RISER/PRIMARY SPILLWAY, AND THE OUTLET STRUCTURE(s). 6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT/DIRECTING) 7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE) DRY DETENTION CELL SPILLWAY 50' WIDE VDOT CL. A: RIPRAP LINED EMERC SPILLWAY CREST ELEV 358.66'. SPILLWAY TO F SIDE SLOPES APPROVED 10' WIDE TOP 365 OF DAM ELEV.=360'. 365 PROPOSED 360 GRAD 360 o� 50 UXISTINC EC-1 ENCY NTION= 3 j j 355 GRADE AVE 4:1 350 350 J J N 0 N W W 0 Q0 0 W r7 Lei 0+50 0+75 PROFILE SCALES: 1"=5' (V) 1"=So'(H) RIPRAP LINED OUTLET PROTECTION DESIGN REQUIREMENTS: Q 1. RIPRAP LINED OUTLET PROTECTION SHALL BE INSTALLED IN CUT WITH CLASS II FILTER FABRIC UNDERLAYMENT LOCATED IMMEDIATELY UPLAND OF THE FLOODPLAIN. 2. OUTLET PROTECTION FOR THE DRY DETENTION CELL SHALL BE 15' LONG & BE FLAT WITH A 0%D GRADE. WIDTH AT BEGINNING OF OUTLET PROTECTION=10', WIDTH AT END OF OUTLET PROTECTION=14'. 3. CONTRACTOR SHALL INSTALL A CLASS II FILTER FABRIC UNDERLAYMENT. FILTER FABRIC SHALL BE KEYED INTO THE EXISTING GROUND A MINIMUM OF 12" AT ITS ENDS & ALONG THE ENTIRE PERIMETER. 4. A 6" LAYER OF #57 STONE SHALL BE PLACED OVER THE FILTER FABRIC FOR ITS PROTECTION BEFORE THE VDOT STD. TYPE I RIPRAP IS INSTALLED. 5. PLACEMENT OF FILTER FABRIC SHALL BE DONE IMMEDIATELY AFTER OUTLET PROTECTION PREPARATION. EDGES OF THE FILTER SHEETS SHALL OVERLAP AT LEAST 9". 6. STONE PLACEMENT SHALL FOLLOW IMMEDIATELY AFTER PLACEMENT OF THE FILTER FABRIC & #57 STONE. RIPRAP SHALL BE PLACED SO THAT IT PRODUCES A DENSE WELL -GRADED MASS OF STONE WITH MINIMAL VOIDS. THE FINISHED SLOPE SHALL BE FREE OF POCKETS OF SMALL STONE OR CLUSTERS OF LARGE STONES. 7. OUTLET PROTECTION SHALL TIE INTO EXISTING GROUND IN CUT AT A MAXIMUM SLOPE OF 3:1. 8. CONTRACTOR SHALL SCHEDULE A MEETING WITH AN ENGINEERING DEPARTMENT INSPECTOR AT LEAST 24 HOURS IN ADVANCE OF THE OUTLET PROTECTION CONSTRUCTION. TICKETS FROM THE QUARRY SHALL BE AVAILABLE FOR REVIEW BEFORE STONE PLACEMENT TO ENSURE CORRECT STONE SIZES. STONE GRADATIONS SHALL MEET MINIMUM CURRENT VDOT ROAD AND BRIDGE SPECIFICATIONS. DRY DETENTION CELL SECTION 375 D DRY DETENTION ELL RISER FOUNDATION NOTE: TO REDUCE THE ISK OF FLOATATION, RISER BASE BARRE CONNECTION SHALL BE FIRMLY EMBEDDED 6" INTO AN 18" THICK R INFORC D CONCRETE FOUNDATION THAT I 8'x8' & BURIED UTSIDE THE LIM TS OFT E EXCA ATION. 370 370 ' MH-1 WITH A IM ELEVATION 0 3' 357.50' A RASHRA K SHALL.BE INSTALLED -EXISTINGOVE THE MH 1's UPPER 024" PENING GRADE INSTEAD OF MH-1 FRAME & OVER. RISER TO INCLUDE A " 2-16' LOW -FLOW 365 ORIFICE WITH AN I VERT=3 2.00' 365 ER APPROVED 10' IDE TOP OF DAM ELEV. 360'. 360 PROP SED GRADING ITH 360 MENDMENT. DRY z DETENTION C LL's VOLUME CON RACTOR SHALL HAS BEEN ENLARGED. �\ \ INSTAL A CO PACTE s CLAY CORE w/ A / CLJOFF TRENCH. EMBANKMENT 0 BE IN 7 ACCORDANCE w/ THE 355 0 Ln DESIGN SHOWN ON 355 d H In BASIN BOTTOM SHALL HAVE P SITIVE SLOPE TO 350 THE RISER IN ALI. PLACES 350 srR s 03 345 Ln 345 PROPOSED 024" HDPE BARREL (64.63' @ 6.190 , INV. I =350.0(', INV. OU =346.0 ') 340 CONTRACTOR TO I STALL 340 A " THICK STEEL PLATE AT THE BOTTOM OF THE MA HOLE S2� PROPOSED VDCT S, °� STD. EW-1 335 335 PROP SED 024" HDPE ARREL (1 4.25' @ B.75%, INV. IN=33 .00', INV. OUT= 29.00') 330 330 PROPOSED FLAT (0%) 18' LONG, 1.5' DEEP VDOT ST INED JIM . CL. AI RIPRAP O TLET PROTECTION. WIDT AT FL09DPLAIN=14', WI TH AT PIPE OUTFALL=10'. 325 SEE THIS SHEET FOR ADD TIONAL NOTES & INSTAL TION REQUIREMENTS. 325 �0 �0 O� ww O � c0 4 c0 N m Ln L6 N rj c0 r� Ln I1) W Lj- 0+50 1 +00 1 +50 2+00 2+50 3+00 3+50 O' SCOTT R. COLLINS'Z CJ No. 35791 ZONAL E� Z0 O Q 0�� U m w U) 0 J Q O F cn z W w Ce 0 H -- Q ro 0 � 1 ■ ■ � z w c 00 N 0 � z M W N o z 04 Q N J w Q LLI J Arm J � Q > ' I_LI w O~ ~ J z uj J W V 7 Q z _ O 0 . Q E- I y 0- z W Q W ~ J W Q W (n mow/ O ® U z O J W (J ) J Q LL (D 0 W 0 r1 N Q 2 LL Q Lu w w a � JOB NO. 172131 SCALE AS SHOWN SHEET NO. 8 1/2" aina platad :hook attached with 3,'�` reakener P 2-1; 41" ditl. hnlr 000 p Tsoi-n et.l'1 C: L I I Lr4' HBPE p:aLa (option-L] v r� FrrPF xirL­1i1 1 r31-tir. wiil' I 2-1/8- hole- and 1!1" plate rl Mnnu:oc4urcd by Pitmic �LJ SoLutians rnc. or equal rF O0I 000 .,t;i;•Tx.•akY�. - Shown Kith opiior_e) pLate I HPPF �Lvd.%­l pl-1 im -1.h holes and 1/4' p1me meruraeLurail try Plast3e z2-1/0" t!DWL30R5 Lno or equal N, 0 0 a ❑ 00 o ❑ single BMP F,1vvnI.i0Fi YS a.pltl�c-eel•+' i.9111 VA DE[1 STORMWATER DESIGN SPECIR CATION NO. 14 WET POND SECTION 4: TYPICAL DETAa UPPER 90ELF VdE_TL4v1D {LEVEL 2j lNETLAND CE-L t4FLOW FROM POREBAY QYEFIFL<M MAX TV OEFTH - 12' n(1F1EELAY dREPER 70 TAELE• 14.E FOR VOLUKr flEFERTD7Al9LE REpUIREMENTSI EAr�rBBFdGH 1a.2ROR ME REC+�_AREMEryT'y} 06 LUSH FLOW 4L C"ET FROTECT ICr•1 H113H FLA4V�_ LAN Cu'CAPING R}FJ6 AER�T�rJ FLOW P,4TN J5NL?POOL QEOr41ETRY (RE FE R 70 TAS LE 1 E.2 IJATICSENCH LL2REOUREMrNTARLTS) 2FOR LiWJD FOR Ll AND L2 RErX-�ENENTSi \SAFEWBENCH y,+,FEr1rrA0JATI0 BENCH PL LNMEW NOTE REFER 70 TABLE 14.2 AND C£aF3N SPEC NO. 13 OCNaTRJCTE73 YJE7L4N13 EECTION E. FO R Li A,N1} L: VCLLPME ?U40 2TORAGE DEF'M oRrrEF14 I N wErLA.ND CELL CVUF LOW PO WET PON O NORMAL FK10L C4+ANNEL PFe0TE0T10N 7V - .CM FLDW T4 UPPER a GAFETY 9ENC N ACLl4TiC BENCH NORMAL POOL - UPPM PROFILE (WITH VPPF:R SFIELF VVETLAfND? I1101 FLt}W TV WET PQW NQ F"NL � NI 11=I I I I I I II=Il l .I I TIMTF I T) = - RFE REF N07E: REFER TO 8EGTvQN $ FOR L1 ANO L 2 N)9M#%L POOL VOLUME, AND AND TV AND CHANNEL PF=o-rIDN 8rrcwwsr DEPTHS PIP 0FILE iWITHQIJT UPPER SHELF VVETLAHM Figure 1A 4. Wer Pond 043sign Sc hemarics SLOPE LOW FLOW W r-Lcm APPROVED WET POND CONSTRUCTION NOTES: FACILITY PLANTING SPECIFICATIONS: 1. THE CONTRACTOR SHALL ESTABLISH AND MAINTAIN A VEGETATIVE COVERAGE IN THE POND AND ITS BUFFER. 2. THE CONTRACTOR SHALL ALSO INSTALL THE WETLAND SHELF AND AQUATIC BENCH PLANTINGS, AS REQUIRED, AND USE NUTRIENT RICH SOIL IN THESE AREAS TO PROMOTE HEALTHY GROWTH AND ROOT DEVELOPMENT. 3. PLANT SELECTION SHALL PROMOTE DIVERSE WILDLIFE AND WATERFOWL USE WITHIN THE STORMWATER WETLAND, AQUATIC BENCH AND BUFFERS. 4. WOODY VEGETATION MAY NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET FROM THE PRINCIPAL SPILLWAY STRUCTURE. 5. A VEGETATED BUFFER SHALL BE PROVIDED THAT EXTENDS AT LEAST 25 FEET OUTWARD FROM THE MAXIMUM WATER SURFACE ELEVATION OF THE WET POND. PERMANENT STRUCTURES (E.G., BUILDINGS) SHALL NOT BE CONSTRUCTED WITHIN THE BUFFER AREA. EXISTING TREES SHALL BE PRESERVED IN THE BUFFER AREA DURING CONSTRUCTION IF POSSIBLE. 6. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY. THE DENSITY OF THESE COMPACTED SOILS CAN BE SO GREAT THAT IT EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHALL BE THREE TIMES DEEPER AND WIDER THAN THE DIAMETER OF THE ROOT BALL FOR BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR CONTAINER -GROWN STOCK. 7. AVOID SPECIES THAT REQUIRE FULL SHADE, OR ARE PRONE TO WIND DAMAGE. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS. CONTRACTOR REQUIREMENTS: 1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS. 2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL INFORMATION. THE CONTRACTOR SHALL ABIDE BY ITS CONTENTS; HOWEVER ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE THOSE OUTLINED IN THE SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FOR A FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA NURSERYMEN'S ASSOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS). 3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY STOCK, PUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005. 4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN. 5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY EXCAVATION). 6. REFER TO THE APPROVED CONSTRUCTION PLANS FOR ANY DETAILED SITE INFORMATION. 7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES. 8. PLANTS WILL BE PREPARED FOR SHIPMENT IN A MANNER THAT WILL NOT CAUSE DAMAGE TO THE BARK, BUDS, BRANCHES, STEMS, OR OVERALL SHAPE OF THE STOCK. CONTAINER GROWN PLANTS WILL BE TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE BEEN GROWN. 9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE HEALTHY, VIGOROUS, AND FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. ALL PLANT MATERIAL SHALL BE FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT. PLANTS DEEMED UNHEALTHY WILL BE REJECTED. 10.ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED SUFFICIENTLY TO HOLD ITS SOIL. CONTAINER STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED. 11.PLANTS NOT INSTALLED ON THE DAY OF ARRIVAL ON SITE SHALL BE STORED AND PROTECTED BY THE CONTAINER. OUTSIDE STORAGE AREAS WILL BE SHADED AND PROTECTED FROM THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL TIMES BY COVERING THE BALLS OR ROOTS WITH MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR MULCHING MATERIAL. 12.THE OWNER RESERVES THE RIGHT TO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BY THE DESIGNER. 13.MINOR FIELD ADJUSTMENTS MAY BE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE APPROVED BY THE DESIGNER. 14.NO PLANTING SHALL OCCUR WHEN THE SOIL IS FROZEN. 15.PLANT MATERIAL SHALL BE PLACED IN EXISTING SOIL WITH EACH PLANTING PIT EXCAVATED TO A SIZE SUFFICIENT TO CONTAIN THE ENTIRE ROOT BALL OR ROOT MASS, WITHOUT CRAMPING ROOT STOCK. 16.THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 90% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. THE PERIOD OF CARE AND REPLACEMENT SHALL BEGIN AFTER INSPECTION AND APPROVAL OF THE COMPLETE INSTALLATION OF ALL PLANTS AND CONTINUE FOR ONE CALENDAR YEAR. 17.THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS. 18.THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIVITIES BEYOND THE CONTRACTOR'S CONTROL. FACILITY CONSTRUCTION: 1. THE CONTRACTOR SHALL USE THE WET POND AS AN E&S CONTROL STRUCTURE, IF SHOWN IN THIS MANNER ON THE APPROVED ESC PLANS. IF APPLICABLE, THE WET POND SHALL SERVE AS A SEDIMENT BASIN DURING PROJECT CONSTRUCTION. IF THIS IS DONE, THE VOLUME SHALL BE BASED ON THE MORE STRINGENT SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENT VS. WATER QUALITY TREATMENT REQUIREMENT). INSTALLATION OF THE PERMANENT RISER SHALL BE INITIATED DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS SHALL BE SET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION WET POND IN MIND. THE BOTTOM ELEVATION OF THE WET POND SHALL BE LOWER THAN THE BOTTOM ELEVATION OF THE TEMPORARY SEDIMENT BASIN/TRAP WHEN POSSIBLE. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF TURBID WATERS WHEN THE BASIN/TRAP IS BEING CONVERTED INTO A WET POND. 2. WET PONDS SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE POND IS COMPLETELY STABILIZED. IF THE PROPOSED POND SITE WILL BE USED AS A SEDIMENT TRAP OR BASIN DURING THE CONSTRUCTION PHASE, THE CONTRACTOR SHALL DE -WATER, DREDGE AND RE -GRADE THE SEDIMENT CONTROL FACILITY TO DESIGN DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE. 3. THE CONTRACTOR SHALL ASSEMBLE CONSTRUCTION MATERIALS ON -SITE, MAKING SURE THEY MEET DESIGN SPECIFICATIONS AND ARE PREPARED AT STAGING AREAS WHEN POSSIBLE. 4. THE CONTRACTOR SHALL CLEAR AND STRIP THE PROJECT AREA IF REQUIRED TO THE DESIRED SUB -GRADE. 5. THE CONTRACTOR SHALL INSTALL E&S CONTROLS PRIOR TO CONSTRUCTION, INCLUDING TEMPORARY DE -WATERING DEVICES AND STORMWATER DIVERSION PRACTICES. ALL AREAS SURROUNDING THE POND THAT ARE GRADED OR DENUDED DURING CONSTRUCTION MUST BE PLANTED WITH TURF GRASS, NATIVE PLANTINGS, OR OTHER APPROVED METHODS OF SOIL STABILIZATION. 6. THE CONTRACTOR SHALL ALSO EXCAVATE THE CORE TRENCH AND INSTALL THE SPILLWAY PIPE. 7. THE RISER AND APPLICABLE OUTFLOW STRUCTURES SHALL BE INSTALLED, AND THE CONTRACTOR SHALL ENSURE THE TOP INVERT OF THE OVERFLOW WEIR(S) ARE CONSTRUCTED LEVEL AT THE DESIGN ELEVATION(S). 8. THE CONTRACTOR SHALL CONSTRUCT THE EMBANKMENT AND ANY INTERNAL BERMS IN 8- TO 12-INCH LIFTS, COMPACTION SHALL BE COMPLETED IN LIFTS WITH APPROPRIATE EQUIPMENT. THE CONTRACTOR SHALL ALSO ADHERE TO THE CLAY LINER SPECIFICATIONS OUTLINED IN TABLE 14.4 BELOW: rage 14.4. Clay LNrer Specrfearlarts Property Test Mathod Unit S cif cation Permeability ASTM D-2434 Crrllsec 1 x iQ Plasticity Index of Clair ASTM D42N424 % Not less than 15 Liquid Limit of Clay ASTM D-2216 % Not less than 34 Clay Particles Passing ASTM D-422 % Not less than 34 Clay Compaction ASTM [�-2218 % 95% of standlar4d proctor dens ity WUrCe: VIr{]InlaZjTnrmWaierManagement1lanoDooK1is~#NJ 9. EXCAVATION AND GRADING TO THE APPROPRIATE ELEVATIONS AND DESIRED CONTOURS SHALL BE ACHIEVED FOR THE BOTTOM AND SIDE SLOPES OF THE POND. 10.THE EMERGENCY SPILLWAY SHALL BE CONSTRUCTED IN CUT WHERE POSSIBLE, OR IN STRUCTURALLY STABILIZED SOILS. 11.THE OUTLET PIPES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION, SHALL BE INSTALLED. 12.EXPOSED SOILS SHALL BE STABILIZED WITH TEMPORARY SEED MIXTURES APPROPRIATE FOR THE POND BUFFER. ALL AREAS ABOVE THE NORMAL POOL ELEVATION SHALL BE PERMANENTLY STABILIZED BY HYDROSEEDING OR SEEDING OVER STRAW. 13.THE POND BUFFER AREA SHALL BE PLANTED WITH A VEGETATIVE GROUND COVER AND THE CONTRACTOR SHALL THEN INSTALL THE APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS. 14.ALL CONSTRUCTION SHALL ADHERE TO THE VIRGINIA DEQ POST CONSTRUCTION BMP CLEARINGHOUSE REQUIREMENTS SET FORTH IN DESIGN SPECIFICATION NUMBER 14. FACILITY MAINTENANCE: MAINTENANCE OF THE WET POND(S) IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE POND. DURING THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRST YEAR FOLLOWING INSTALLATION, AND THE OWNER THEREAFTER: 1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE FOREBAY. 1. MONITOR THE GROWTH OF WETLANDS, TREES AND SHRUBS PLANTED, AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE, AND NOTE THE PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE. 2. INSPECT THE CONDITION OF STORMWATER INLETS TO THE POND FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING. 3. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY GROWTH, OR GULLY EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY. 4. INSPECT POND OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, ETC. 5. INSPECT CONDITION OF PRINCIPAL SPILLWAY, EMERGENCY SPILLWAY, RISER, ORIFICES & TRASHRACKS FOR EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES. 6. INSPECT CONDITION OF ALL TRASH RACKS OR FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION OR OTHER FAILURES. 7. INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND LOCKS CAN BE OPENED AND OPERATED. 8. INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OF THE POND FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING, AND MAKE NEEDED REPAIRS IMMEDIATELY. 9. REPAIR AND REPLACE AS NECESSARY. 10.PLEASE SEE THE TABLE BELOW FOR ADDITIONAL MAINTENANCE MEASURES ABOVE AND BEYOND THOSE OUTLINED ABOVE: Table 14.& Typical We Pond Maim-enance Tasks and Fiegaency: Maintenance Items Frequency ■ Mowing -bNice a year Quarterly c r after major storm s ■ Remove debris and blockages (}1 inch of rainfall) * Repair undercut, eroded, and bare s011 areas * Mowing Twice a year * Shoreline cleanup to remove trash, debris and 11catables + Afull maintenance inspection Annually + Open u p th a riser to access and V3d the valves + Repair broken mechanical components, I needed One time -during the + Pond buffer and aquatic bench reinforcement plantings second Warfollo-wi egnslructon • Foreba Sediment Remaval Every 5to 7 years + Repair pi W. the riser ands it Iwo , as needed From 5 to 25 years FACILITY INSPECTION: MULTIPLE INSPECTIONS ARE CRITICAL TO ENSURE THE BASIN(S) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION IS DICTATED BY THE CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO INSTALLATION. MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR, WITH THE ENGINEER AND INSPECTOR, DURING THE FOLLOWING STAGES OF THE WET POND'S CONSTRUCTION PROCESS: 1. PRE -CONSTRUCTION MEETING 2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS) 3. EXCAVATION/GRADING (E.G., INTERIM/FINAL ELEVATIONS) 4. WET POND INSTALLATION (E.G., INTERIM AND FINAL ELEVATIONS) 5. INSTALLATION OF THE EMBANKMENT, EMERGENCY SPILLWAY, THE RISER/PRIMARY SPILLWAY AND THE OUTLET CONTROL STRUCTURE(S). 6. PLANTING AND VEGETATIVE STABILIZATION PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT) 7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE) NTH oFt; O SCOTT R. COLLINS'Z CJ No. 35791 ZONAL E� Z z O Q Day U m LU V) J Q O F- cn z W Lu Ce CD W cV Q M z f` LU ® rn 0 N z M W = F CD z L� N N J C W > ^ L L J V) - L� ' F IV / L L9 O z L J W l 7 Q � e Ll I I e LU Q L F___ J F ,r` e LU (n C moLU/ O C U z Jgyp ^ < LU V / C)� L IIIIIIIIJ Q � L (D LL l p W 0p 17 711 N Q LU I..L H Q LU fib LU � _ a rn LLL JOB NO, 172131 SCALE AS SHOWN e 0 SHEET NO. 9