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HomeMy WebLinkAboutWPO201600010 Plan - E&S 2016-02-14 Erosion And Sediment Control Plan Dovic:% River Crossing 4877 Browns Gap Turnpike Crozet, VA 22932 Prepared by. K. Maybury 1318 N Wakefield St Arlington, VA 22207 February 14, 2016 Revision Previous Version: November 9, 2015 1 Erosion And Sediment Control Plan Doyles River Crossing 4877 Browns Gap Turnpike Crozet, VA 22932 February 14, 2016 Project Description We are proposing to construct a low-water crossing to span the Doyles River to allow vehicles and pedestrians to access our property where we plan to build a house.The Doyles runs along the full length of the only road that borders the property (which is Route 810-Browns Gap Turnpike), so there is no other means of ingress/egress to the property except across the river. This crossing will replace two previous crossings that were placed in the same location by former owners that have since washed out. (There is also no longer any house or structure at the "4877" Browns Gap Turnpike address.)The parcel is 01500-00-00-01600. See illustration #1 for the site location. The total area to be disturbed by our project is 6,265 square feet. No critical slopes are impacted. We have an existing Special Use Permit (SP-89-64)for this and we are in the process of applying for a Joint Permit. The contractor is Digs, Inc., 1030 Linden Avenue, Charlottesville, VA 22090. Telephone: (434) 978-4435. License: 2701039841. This report has been approved by the contractor.This report, and any updates or changes required by the County, will be provided to the contractor to be used as their template for work. The site is relatively steep from Rte 810 down to the Doyles on the west side. However, on the other, east side of the Doyles there is a broad, low floodplain. Our plan is to improve the old, existing gravel road on both sides of the river, and put a low-water crossing in the river. The crossing will be comprised of 36" inside-diameter culverts with a concrete top. See Attachment #1 "Doyes River Crossing,"for the Layout and Structural Plans. As part of the construction process, we intend to restore the west floodplain of the Doyles to its original condition. A previous owner had placed a large amount of fill in the floodplain. Most of this washed out in the 1990s but what remains can be seen in illustration #2 (it looks like a small hill with a metal at the base).This was probably the entrance to and the end of a tall bridge with culverts at the bottom. Our intent is to remove this material and replant with native vegetation to restore the floodplain to its original contour and prevent floodwaters from building up behind 1 this man-made obstruction. We have written permission from the adjacent landowners,the Antrim family,to remove any of this fill that is now located on their property. Purpose of this Plan This plan describes how we will protect against erosion during and after construction. It is also intended to satisfy conditions 1 and 4 of our Special Use Permit. Although that permit references a water quality impact assessment,we understand (per an email April 8, 2015 from Glenn Brooks)the conditions will now be satisfied by following Chapter 17 of the Albemarle County Code, i.e., by submitting this Erosion and Sediment Control Plan. (Our project does not exceed 10,000 square feet and therefore there is no requirement to comply with the Virginia Stormwater Management Program.) General Conditions The surrounding areas are zoned RA and are well vegetated with nearly all native vegetation (Japanese stiltgrass is the only major exception). Soils are classified as Craigsville Loam (in the floodplain) and Thurmont Very Stony Loam upland. The Doyles here has transitioned from a mountain stream to a 'C' Channel, with a moderate floodplain. Slopes in the area to be disturbed are not extreme (no critical slopes). In short,there is nothing that indicates unusual conditions or more potential for erosion than typical. See illustration#3 for a topographic flood map. How We Will Meet Minimum Standards(MS) MS-1:Stabilization We will plant Virginia wildrye (Elymus virginicus) on all disturbed land areas. Since we will be building during low flow, we anticipate being able to plant immediately after reaching final grade. If for some reason we cannot plant on any area that is disturbed, even small perimeter areas, within 2 days we will cover with mulch until it can be planted. Virginia widrye is recommended by Virginia DCR as an appropriate alternative for non-native invasive species suggested in the Virginia Erosion and Sediment Control Handbook: (http://www.deq.virginia.gov/Portals/0/deq/water/Publications/nativelnvasiveFAQ.pdf) and it is particularly adapted to streamside conditions. The application rate will be as recommended: about 5 lbs/ 1,000 sq. feet and we'll water and scratch it in and also mulch it if it is dry weather. MS-2:Stock PilessWaste, and Borrow Areas Some of the fill removed from the west side of the Doyles will be used to build the new roadbed of the paved driveway so that it can tie into Route 810 on grade and fall at no more than a sixteen percent grade to the crossing. The rest of the material removed will be taken by our contractor, Digs, Inc.,to an off-site area that already has a soil erosion control plan approved by the local Program Administrator. If any waste needs to be stockpiled onsite temporarily, it will have a silt fence installed so that silt does not leave the area. In addition, a silt fence, will be anchored and installed along the base of the entire disturbed area, above the stream (see MS-4 below). MS-3: Permanent Vegetation Virginia wildrye is perennial and well suited to streamside habitats so we should not need additional plantings on most areas. Native plants should establish in succession naturally in most areas. However, on the area where we will be removing the fill (the remnants of the old 2 crossing), we will follow the planting guidelines in the Riparian Buffers Modification and Mitigation Guidance Manual(Baird and Wetmore 2003), specifically those in "Restoration/ Establishment Table B" of that Manual, which have been determined by the County Engineer to be most appropriate for our circumstance. The area appropriate/available for planting here is approximately 15 feet wide by 60 feet long(900 square feet) running along the west bank of the Doyles. Following Table B, and allowing for site conditions, plantings in this area will: • Include 3 canopy tree species. • Include 5 understory tree species or 3 understory tree species and 5 shrubs. • Include other native woody seedlings such that, in total, all plantings are on a spacing of 8 feet by 8 feet on center(a minimum of 14 plants for this area with a minimum survival rate of 10 plants after two growing seasons). • Be container-grown tube seedlings. • Be staked, mulched, and trees will be protected against herbivory with tree tubes. • Be planted in the spring or fall (not between June 1 and August 15). • Be native, shade tolerant, and flood tolerant species. Canopy trees will likely be red maple (Acer rubrum) or tulip tree (Liriodendron tulipifera); small trees and large shrubs will be spicebush (Lindera benzoin), winterberry(Ilex verticilata), inkberry(Ilex glabra) or red chokeberry (Aronia arbutifolia). Plants will be obtained from a retail outlet for Octoraro Nursery or similar that specializes in locally-sourced (mid-Atlantic) native plant materials. MS-4: First Step Measures • Construction entrance:There is an asphalt parking pad/driveway area and an existing gravel road, which acts as the current"entrance"to the 4877 Browns Gap Turnpike address. The gravel is sparse on the ground right now but our first activity will be to improve this by adding more gravel. This will act as a parking area and a barrier between the construction and Route 810. All the staging of construction vehicles should be able to happen here.There will also be a place to leave construction vehicles, if needed on the other(east) side of the Doyles, where the gravel road continues(and will also be improved as part of this project).This will ensure that MS-13 (below) is not applicable. Maximum grade of the driveways will be sixteen percent. • Silt fences anchored with wooden stakes:These will be established along the entire bottom (downslope) perimeter of the disturbed area before construction activity begins. MS-5—M11 (Earthen Structure Stabilization,Traps and Basins, Cut and Fill Slopes, Concentrated Runoff, Water Seeps, Inlet Protection, Outlet Protection) are not applicable. MS-12: Watercourse Construction Non-erodable material will be used when temporarily diverting waters so that all in-stream work will be conducted in the dry. MS-13:Temporary Stream Crossing is not applicable.The construction vehicles will only cross the Doyles twice during the anticipated three weeks needed to complete the build. 3 MS-14: Other Watercourse Regulations All other requirements shall be met and applicable permits will be onsite. MS-15: Bed and Bank Stabilization We will use Virginia wildrye on all disturbed areas. If necessary, we can augment with Scirpus lacustris as recommended in Std &spec 3.22 and by DCR but this only seems to be available wholesale from mitigation banks.Virginia wildrye also DCR recommended so we believe this will be adequate. MS-16: Underground Utility Lines is not applicable MS-17 Vehicular Tracking and Construction Entrance We will shovel or sweep sediment to a sediment disposal or transport area (see MS-2) and then wash down the street (Rte 810)at the end of each construction day. MS-18: Control Removal We will remove the temporary erosion control measures (in this case just the silt fences) after they are no longer needed (within about 4 weeks). In Addition to Minimum Standards: As required by the County, we will provide a concrete washout area for the chute and other equipment.This will consist of either a prefabricated washout basin or one constructed onsite (contractor's choice). If constructed onsite, we will use hay bales or similar to support a plastic liner, making a pit to receive the washwater.The washwater will be allowed to evaporate or will be vacuumed off and the remaining hardened solids will then be broken up and removed from the area to a landfill. Anticipated Sequence of Work: 1. Improve construction entrance. There is a minimally adequate construction entrance--- an old gravel road rising from the bank of the Doyles up to an Rte 810 and an asphalt parking area. We will improve the gravel road by adding more gravel. (MS-4) 2. Place and anchor the silt fences along the base of the entire disturbed areas (both sides of the Doyles). (MS-4) 3. Restore the floodplain of the Doyles to its original condition on the west side by removing a large amount of fill and an old metal culvert placed there floodplain by a previous owner and replanting with native plants. Immediately following excavation, we will re-vegetate (MS-1 and MS-3) Waste will be removed to an approved off-site area (MS-2). 4. Install sandbags in half the stream to divert the flow and allow all work to be done in the dry. (Relates to MS-12). 5. Begin to build the crossing: please see the structural plan in Attachment#2 for details. 6. Once half the bridge is constructed, move the sandbags to divert the flow through the installed set of 5 pairs of culverts(Relates to MS-12). 7. Cross the Doyles at this point and improve gravel roadbed on the east side of the Doyles so equipment can be parked there if needed (vehicles do not need to go back and forth across the Doyles). 8. Remove silt fences once vegetation is established on disturbed areas. (MS-18). 4 Daily Basis: have permits available onsite (MS-14) and clean up at the end of each construction day as described above (MS-17)and using the concrete washout area as needed on concrete pour days. Six Attachments (three included with this document): 1. Site location 2. Photo of fill to be removed 3. Topographic flood map (three in separate files): 4."Doyles River Crossing," plans including Cover, Layout Plan, and Structural Plan 5. Hand-annotated plan showing location of ESC measures 6. Signed certification statement 5 Illustration#1-Site location 'r It . - 1 i M1 t 3 t , k _ , , . c _ _ ..,..... 1-----. i rr� r� I , —. _ . ‘ ySA T' r/ � - . , PROPOSED CROSSING _ : i .. . s _ t 4 A i e ♦ ,- a 4 «. ® m .... _V �,yr. P 6 Illustration#2- Photo of fill to be removed » . i .. . ' • •• .1', ',., .11,11,:;•:s./," x;4I 4., ter s " . ,�, �f i 71 f € if1,,,1:.,,,-‘,;:,:44 E :. t sk, £s�?�q�r' �,»ta" ,� '1�'�k iii' � �. ---." :Pt 4:4i!Or '2'* i''' ^ f ,.;'"� ate. -._ • a; # a ',. . ✓ a fix ' �,. �s« %..� "k3 .'' �p :,,4.:,' / # 'k' �., is � fi i•"`p' 7 ''' 1 / /7/ / /// IN lis)k- ' --''''' ..-'''.- i ,. if /,„,e,/./. ' / ,,•' , N. 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I • ..NI, *a de Di-- .• . ............-• *A 0 de i0 .t.1 0 ffi Oil ! -ui te. a.,.,.... dp zmie- . c .1 g \ a ta -....... , ittl L*1 , -.... t., I 1%. a -....... 1 LW La 0 1...i .,., t 0 i et. et ....--., 0 ---.... -,. o •-..„ cite° ' ta b E e 0 LLA z Certification Statement I understand that failure to implement corrective action(s) identified during inspection as soon as practicable but not later than seven (7) days after discovery, or failure to comply with requirements of the Erosion and Sediment Control Plan within three (3) working days following receipt of notice of deficiency, or request for additional ESC measures (Sec. 17-900/Notice to Comply) may lead to permit revocation or order to stop work (Sec.17-901) until any violation of the Permit, Plan, or other applicable requirement of Chapter 17 is determined by the Administrator to have abated. I hereby agree to be responsible for carrying out each of the duties and responsibilities specified by this Erosion and Sediment Control program. Ktc-f-k tet4-1 AAA-111w/ Name /444y--(7,7 Signature f ill / I Date