Loading...
HomeMy WebLinkAboutWPO201300013 Plan - Approved 2013-02-11 Letter of Transmittal bate: May 8, 2013 To: Michelle Roberge From: bavid Wyant, P.E. 4686 Garth Road Crozet, Va. 22932 NfIsj16@gmail.com (434)960-3978 (M) (434) 823-2815 (H) Re: 6913 Markwood LLC Project Attached are 2 copies of the revised E & 5 Plan for the 6913 Markwood LLC project. The plan describes the clearing operation performed and the E & 5 measures recommended by your staff to restore the disturbed area back to permanent vegetation. Calculations for the sediment trap are shown in the narrative, bust control was described in the narrative and has now been added to the plan. A vicinity map is included as well as my seal. This document basically describes what was done and has been completed. Any questions or problems let me know. Thanks, . rvc/—r--01 FILE COPY This copy of the approved plan is reserved for the official files of bavid Wyant Albemarle County. Please do not remove this plan from the file. 7/2/G itiPe) 0 3 6 2 0 rrdt" C EROSION AND SEDIMENT CONTROL PLAN 6913 MARKWOOD LLC 435 Park Street Charlottesville, Va. 22902 Prepared By David C Wyant, P. E. 4686 Garth Road Crozet, VA 22932 February 9, 2013 March 25, 2013 (revised) April 30, 2013 (revised) it ». t::: '3' / DAVID A 4 3 C.WYA T,SR. �:``�f n No. 07511 --,,,,„4.-- u (...6.° \\.„1,,,, t EROSION AND SEDIMENT CONTROL PLAN 6913 MARKWOOD LLC 435 Park Street Charlottesville, Va. 22902 Prepared By David C Wyant, P. E. 4686 Garth Road Crozet, VA 22932 February 9, 2013 March 25, 2013 (revised) April 30, 2013 (revised) Project Description The owners of parcel 8-35A1 which is located on State Route 664 north of Earlysville in Albemarle County, Virginia, has cleared the back yard of their residence. The purpose of this plan is to describe the erosion and sediment control measures proposed during the establishing of vegetation on the parcel. Approximately 0.9 acre of the 3.17-acre parcel was disturbed during the clearing operation. Existing Site Conditions Parcel 8-35A1 fronts on the east side of State Route 664. The parcel is also bounded by residential parcels on all other sides. The terrain on the lot slopes to the east. Runoff from the parcel in the form of sheetf low drains in the same direction. The highest point on the parcel is approximately 636 feet on the east side of Markwood Road, while the lowest elevation is 592 feet along the east side of the parcel. The average slope across the parcel is 7.5%. 2 Adjacent Areas The adjacent properties are zoned RA. The parcels to the south and north are residential while the parcel to the east is mostly wooded. There should be no offsite stormwater runoff, since there is native vegetation below the disturbed area, a silt trap to collect any runoff, and permanent stabilization applied at the completion of the clearing. No streams, lakes, rivers, or residential areas will be affected by the construction. Waste and Borrow Areas It is not anticipated that any borrow material will be needed nor any excess material will be generated, since the work will only be to clear the parcel of undesirable vegetation. In no case shall the contractor haul material to or from an off-site area that does not already have a soil erosion control plan approved by the Local Program Administrator. If during construction topsoil and surplus soil is stockpiled the stockpiled area will have a silt fence installed so as to not allow silt to leave the area (MS-2). Soils The soils in this area have not been classified, but the soils are generally silty clays. These soils have a moderate infiltration rate when thoroughly wet. The soils are moderately deep or deep and moderately well drained or well drained, and have moderately fine to moderately coarse texture. The soils' transmission or permeability rate is considered moderately rapid to slow. Surface runoff is medium to very rapid and erosion potential is moderate to very severe. The erosion factor, K, is 0.32. Erosion and Sediment Control Measures All E&S measures shall be installed and maintained as specified in the latest edition of the Virginia Erosion and Sediment Control Handbook (VESC). The following E&S measures and its VESCR STD. & SPEC. will be used on this project: permanent stabilization (P5-3.32), temporary seeding (TS-3.31), silt trap (5T-3.13), silt fence (SF-3.), dust control (DC-3.39), and mulching (MU- 3.35). If work necessitates the use of any addition measure(s), the 3 • contractor will use them. Descriptions and other details of all E & S measures included in this report are attached to this report. Concentrated stormwater should not be allowed to flow down any slopes (MS-7). (MS-4) The silt trap (ST) should be constructed prior to any construction activity on the site. Silt fence measures should be used around any stockpiles (M5-2) or at any location where sediment-laden water could leave the construction site. Temporary protection and permanent stabilization of all soil stockpiles on site as well as borrow areas and soil intentionally transported from the site must be stabilized or protected with sediment trapping measures, if approved by the Local Program Administrator after an amended E & S Control Plan is submitted. (MS-17) Where construction vehicle access 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 transported to a sediment control disposal area. Street washing shall be allowed only after sediment is removed in this manner. This provision shall apply to individual subdivision lots as well as to larger land disturbing activities. (MS-1) All disturbed areas shall be fertilized, seeded (TS-3.31), and mulched (MU-3.35) within 7 days after the completion of grading, according to 3.31, 3.32, and 3.35 of the VESCR Handbook. It is envisioned that temporary seeding will be needed anytime that small perimeter areas need stabilization before permanent seeding is installed. Stabilization measures shall be applied to earthen structures such as dams, dikes, and diversions immediately after installation (MS-5). All temporary erosion and sediment control measures shall be removed within 30 days after final site stabilization or after the temporary measures are no longer needed, unless otherwise authorized by the Local Program Administrator. Trapped sediment and the disturbed soil areas resulting from the disposition of the trapped sediment shall be permanently stabilized to prevent further erosion and sedimentation (MS-18). 4 Cut and fill slopes must be constructed in a manner that will minimize erosion. Slopes that are found to be eroding excessively within one year of permanent stabilization shall be provided with additional slope stabilizing measures until the problem is corrected (MS-7). Concentrated runoff shall not flow down cut or fill slopes unless contained within an adequate temporary or permanent channel, flume, or slope drain structure (MS-8). Wherever water seeps from a slope face, adequate drainage or other protection shall be provided (MS-9). All storm sewer inlets that are made operable during construction shall be protected by culvert inlet protection measures (CIP) so that sediment-laden water cannot enter the conveyance system without first being filtered or otherwise treated to remove sediment (MS-10). Before newly constructed stormwater conveyance channels or pipes are made operational, adequate outlet protection and any required temporary or permanent channel lining shall be installed in both the conveyance channel • and receiving channel (MS-11). The following minimum standards are not applicable on this project: (N/A) When work in a live watercourse is performed, precautions shall be taken to minimize encroachment, control sediment transport and stabilize the work area to the greatest extent possible during construction. Nonerodible material shall be used for the construction of causeways and cofferdams. Earthen fill may be used for these structures if armored by nonerodible cover materials (MS-12). (N/A) When a live watercourse must be crossed by construction vehicles more than twice in any six-month period, a temporary vehicular stream crossing constructed of nonerodible material shall be provided (MS-13). (N/A) All applicable federal, state and local regulations pertaining to working in or crossing live watercourses shall be met (MS-14). (N/A) The bed and banks of a watercourse shall be stabilized immediately after work in the watercourse is completed (MS-15). 5 Underground utility lines shall be installed in accordance with the following standards in addition to other applicable criteria: a. No more than 500 linear feet of trench may be opened at one time. b. Excavated material shall be placed on the uphill side of trenches. c. Effluent from dewatering operations shall be filtered or passed through approved sediment trapping device, or both, and discharged in a manner that does not adversely affect flowing streams or off-site property. d. Material used for backfilling trenches shall be properly compacted in order to minimize erosion and promote stabilization. e. Restabilization shall be accomplished in accordance with these regulations. f. Applicable safety regulations shall be complied with (MS-16). Albemarle County general construction notes and general construction notes for E & 5 control plans are attached to this report and should be adhered to during construction. All work including any staging being done within construction limits. The following is the suggested order of work: 1. Install the silt trap (ST) and silt fences (5F) 2. Begin grading and clearing of the parcel 3. Apply temporary seeding to areas not ready for permanent seeding (MS-1). 4. Apply permanent seeding (P5) and mulch (MU) to stockpiles and all denuded areas ready for permanent stabilization (MS-1 & 2). 5. Any temporary sediment control structures (CE, 5F, CIP, etc.) are to remain in place and will be removed only when a satisfactory stand of permanent grass is present and the upstream areas are stable with stone or pavement (MS-18). 6 6. After permanent stabilization all measures used to collect sediment must be cleaned out and properly stabilized. Dust Control Dust control (DC) shall be handled as specified in 3.39 of the VESCR Handbook. Permanent Stabilization (MS-3) All permanent stabilization (P5-3.32) shall conform to the STD. & SPEC. in the VESCR Handbook. A permanent vegetative cover shall be established on denuded areas not otherwise permanently stabilized. Permanent vegetation shall not be considered established until a ground cover is achieved that, is uniform, is mature enough to survive, and will inhibit erosion. Permanent or temporary stabilization (TS) shall be applied to denuded areas within 7 days after final grade is reached on any portion of the site. Temporary soil stabilization shall be applied within 7 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. If sediment basins, sediment traps, perimeter dikes, sediment barriers or any other measures intended to trap sediment are determined to be needed by the contractor, then they shall be constructed as a first step before any upslope land disturbing activity takes place. Sediment Trap Design (VESC Std. & Spec. 3.13) Initial Storage Volume = 134 cu. yds. X ac. _ (134)(0.9) = 121 cu. yds. Note: Half of storage in dry and half in wet Wet Storage Volume = 61 cu. yds. Wet Storage Volume = 0.85 x A(1) x D(1) Use D(1) = 1.0 ft. A(1) min. = 72 sq. ft. (min.) so 6 ft. x 14 ft. and 1 ft. deep Bottom of excavated area = 591 ft. Dry Storage Volume = 61 cu. yds. Dry Storage Volume = {[A(1) + A(2)]/2 } x D(2) Use b(2) = 1.0 ft. A(1) + A(2) = 122 cu. yds. A(2) = 38 sq. ft. with A(1) = 84 sq. ft. so 6 ft. x 7 ft. Elev. at bottom of aggregate outlet = 592 ft. Elev. at overflow crest = 593 ft. Elev. at top of aggregate outlet = 594 ft. Min. Length of Outlet = 6 x ac. _ (6) x 0.9 = 5'-6" wide Width of Embankment = 2 ft. since Height of Embankment = 2 ft. and water height = 1 ft. (Plate 3.13.1 of VESC) - see attachment Maintenance All measures are to be inspected, maintained, and repaired as specified in the VESCR Handbook. At least weekly inspection shall be performed on all measures and always the day after any storm event. When the pool area behind any measure (sediment trap, silt fence, etc.) reaches one-half of the capacity of the pool area, the silt shall be removed and disposed in a protected area for seeding. Responsible Land Disturber David C. Wyant, P.E. 4686 Garth Road Crozet, Va. 22932 Lic. 07511 Stormwater Management (MS-19) . (MS-19) Properties and waterways downstream from development sites shall be protected from sediment deposition, erosion and damage due to increases in volume of stormwater runoff. 8 a. Concentrated stormwater runoff leaving a development site shall be discharged directly into an adequate natural or man-made receiving channel, pipe or storm sewer system. b. If existing natural receiving channels or previously constructed man-made channels or pipes are not adequate, the applicant shall: (1) Improve the channel to a condition where flow will not overtop the banks or cause erosion to the channel bed or banks; or (2) Provide a combination of channel improvement, stormwater detention or other measures which is satisfactory to the plan approving authority to prevent downstream erosion. c. The applicant shall provide evidence of permission to make the improvements. d. If the applicant chooses an option that includes stormwater detention he shall obtain approval from the locality of a plan for maintenance of the detention facilities. The plan shall set forth the maintenance requirements of the facility and the person responsible for performing the maintenance. e. Outfall from a detention facility shall be discharged to a receiving channel, and energy dissipators shall be placed at the outfall of all detention facilities as necessary to provide a stabilized transition from the facility to the receiving channel. f. Increased volumes of sheet flows that may cause erosion or sedimentation on adjacent property shall be diverted to a stable outlet, adequate channel, pipe or pipe system, or to a detention facility. g. In applying these stormwater runoff criteria, individual lots or parcels in a residential, commercial or industrial development shall not be considered to be separate development projects. Instead, the development, as a whole, shall be considered to be a single development project. 9 h. All measures used to protect properties and waterways shall be employed in a manner which minimizes impacts on the physical, chemical, and biological integrity of rivers, streams and other waters of the state. ro ILi* i I .. '-`') �, I m i a. a . 411's ihib NE_ E O E -0 i i I I So, i mS. ; ilkt 1 ,� ,. ' ' a a di Li �, iy --....r -o ----,,,,i'' 1.—_, •A 412:100e, rs'N In % All *4.4„ .4111. . vall,„ "000 Vipb, r''<, co co / Z U�EK O -fdO. pQ 4 ao A;►� '!414$8'04 �� Y °., s L. 7p Illithi, fL, <N, ' Ilk M v 3. 4 Q r m l 9,0, GPP i 9 6 11111 t� ir o z ew d LIT � a .a ja tA b o J j pd Jar ... 1 s,... �. E iD L 11111 00 �P ,y C.)f o I g. yt. AXI / CO Yr- i / g 1992 3.13 TEMPORARY SEDIMENT TRAP 1' VARLABLf I ORIGINAL r, VA RIABLE• GROUND ELF zg Z <� . 1V, / v. - Syy�f E lev. =g9f • / '' ' llr #iZ 67 CU. YD./ACRE %.. * 'j• , ��� . __ ' 1• . N VARIABLE**1"-'=.110 72 _;,• G:` ` 0� % E/ev, =S9z , 67 CU. YD./ACRE r MAX. (EXCAVATED) 4.. 1 e v, _$ .j FLIER CLOTH ORIGINAL ' GROUND ELEV. *SEE PLATE 3.13-1 COARSE AGGREGATE« CLASS I RPRAP CROSS SECTION OF OUTLET CLASS I RIPRAP w s i _ ' /f . LENGTH (IN FEET) _ B X DRAINAGE AREA ON AC.) \-.%..:7-_7__--_7___-:„\,--,,_--- _ sue ' •• g7-,in_:!i► i-t� \ _ �� �:.i . D yli -ze_ 411:14 r �,N,„......_ �. ^ue Ntat,\i I C { ) COARSE AGGREG4TE” - , / ~-�'�:.e.::/:.../.-,_;-,. EXCAV�A�TED FILTER CLOTH AREA 1 - r.\ COARSE AGGREGATE SHALL BE VDOT #3, #357 OR #5 OUTLET (PERSPECTIVE VIEW) Source: Va. DSWC Plate 3.13-2 III - 76 Ni V / 6953 =ate, f`5 ` }f ■ _ N ig' r i , + = 66913 1� c.nstructio i i I . Sr - �" 11 ST *' General Construction Notes 1. Prior to any construction within any existing public right-of-way,including connection to any existing road,a permit shall be obtained from the Virginia Department of Transportation(VDOT).This plan as drawn may not accurately reflect the requirements of the permit.Where any discrepancies occur the requirements of the permit shall govern. 2. All materials and construction methods shall conform to current specifications and standards of VDOT unless otherwise noted. 3. Erosion and siltation control measures shall be provided in accordance with the approved erosion control plan and shall be installed prior to any clearing,grading or other construction. 4. All slopes and disturbed areas are to be fertilized,seeded and mulched. 5. The maximum allowable slope is 2:1 (horizontal:vertical). Where reasonably obtainable, lesser slopes of 3:1 or better are to be achieved. 6. Paved,rip-rap or stabilization mat lined ditch may be required when in the opinion of the County Engineer,or designee,it is deemed necessary in order to stabilize a drainage channel. 7. All traffic control signs shall conform with the Virginia Manual for Uniform Traffic Control Devices. 8. Unless otherwise noted all concrete pipe shall be reinforced concrete pipe—Class III. 9. All excavation for underground pipe installation must comply with OSHA Standards for the Construction Industry(29 CFR Part 1926). General construction notes for Erosion and Sediment Control plans 1. 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. 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. 0 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 50/50 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 grade limestone shall be applied at 901bs/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 1801bs/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) — /1 u b c j L O , c . r c ° R L a �C O T. v u Ct D G 5 u ? o u E E"13 r^ u 0 a E c� O a A 3 C 8 1 u c u d " ° " C o s 3 c c v 3 � a � 8y _ ° B 4 c ' 0 a o E N u c 0 0 c = u —) N w u 4 c n ° 7 b r x be.n s c = u is 2 8 v a 5, 1 c u � S m = c o E 0.-c G F o c A o O v u � m u ° c c c j c E u E . L u -m oc' c 6. N 8 y ti Is X- V O J O O m b u b ' a1 c c b •U. . C• C U d .U . ° m 0. ° n E m b u E ° 'u E r 3 5 UI il E u r E E. o l ii C.u 3 `o . s E ,_ u E C V � > T 's � M c E Bc t � I) E V AR ii o Z R ? v a.)c o m c o .` o u • u c t y u L- ®p y E y ° s E e o ..c R m c E ^ ° CE 7O b c c � • c 1 S b 2 a q G C U io0 = c .L - 2. po p OJ 41 v w v Q Q b Q S y Q A Q o- I Q. n Q a 'f. E . y%♦ b i 0 U .•-• nn, o 4, .•. nun x ,� 0 to CO i um ,� b_ . uun j o nw ` o 2 (a) .. uun 11111 I 0 I b Jr r i gnu x U •. 111111 'i•: ,n n ii• U �. ::. r Q. V 0 0 o uO cn --- (� w CE 0 Z Q F- LU F- Z ctt W U tap O Z tj w 0 0 - w crF- w v � w w m Q � Z0 c E �- w ¢ Dv � N a) Z m ° � CD 0 Q t— Lii z g a- w w F- t.) al CO c w LU a. Z � z ¢ cc iw- p Ow --I0 co .� ..J o co � � w ac~r) 0) to m r~n ? OCLL pl--) mpl--, Q O O Z co M. _ • 0 5 cL 111 g 81 g g •-s £ h � "yet ~� if � E IA � 45 99 Bp Ili . 8 a. 1195 ir :�3 $ 1 5 a sI rQ i g �,s ZNI iir hi 5 lit III II g 4 - -.p 7 an r ii . B. 31 $l ilia sit si B � it II -.mil_ Ibi 1 3 Pl ! li iii 1411 c IP i Ii 011 A 1H, p4 t. .s.f l' -sit / . 11 II 91 9001 -� 3 1 i b 1 i 1] III hil tali� Q3� ; lip Iai;A; Air,. l ► Y 1111 !iii il 11! Ilk fli II !ill !it w tI ( 11 till ® _.. . 9D. 0 8 0 a c0 La: 0 t 6 f= a. Z W o $ * Q Z Ill ICC W I- C►- t!) >' Q ~ > > 0 H Z 0 CC CC IL Z Z CC Q W a 0 - a Z Z Q ti s >- W H a. obi Cr CC a0 at- rt ac a7 � � a. a. "'� miZ uj Lu -� w � j j WW WW W � Q 1= +� = D PI hW- u... HQD 0 t- tO I- 0 I- u) a- woo 0 r r .... to �n i i lr) C) @7 r) N t , H c • > a 0 G U O c m U W >u at -6 c C c E O _ 7 U CZ F. H E m G y Q. pp o o n• N O C � 0 _ p u c v . f) u io Q > u c E $ ,,, m c u E u c `c o v ` J U Q3 b .F. C L C .5 C _ 2 4 O O .: � U O m �e O ° °° a. v °�° v h ,.°. . A o c b E ' Q - n c C > 5 C A d 4. = m O > y .N ° L.. ta� .0 .- „ c 4 8 -o v E ° 6 v U 3 Q s y a^�i 1 o ' a .o c E , ao_ v m >. a a m p, a 3 u �° u w i, o cm N F.Z. 3s .c .n o .c ? c v ° § c . 9 "� aco N o -a U �'a U m >� C U m ._ u 9 tz-2 Zii 'G m E e c m II = Ti. E o o c 3 v . ca ° 3 °O ° c n o' a eyy o HI 0 u c„� v > t, 3 m ; p 7, • T U �. n N CO 63 c�`C U 1y i.p 74 p 5 c o o m U L , a y_' a - E c C �`tl <, '° 3 - d > u E 3 e-.5 3 `u H o a g .sc -c c 25 ,a _° o CA 0 m VVW ..a a .r. ° p u y 0.-5- 3 E 0: c to a. u - b � y o` 8 o o a a ° t w c 5 t L=ao d 3� �- > gou o 3 . .?