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HomeMy WebLinkAboutWPO201900010 Review Comments WPO VSMP 2019-07-02Phone 296-5832 COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 VSMP Permit plan review Project title: Earlysville Subdivision Project file number: AT0201900010 Plan preparer: Clint Shifflett [clint.shifflett@timmons.com] Timmons Group Owner or rep.: Luke Kitelinger [kitelingerl@yahoo.com] Bella Signature Homes, LLC Plan received date: 21 Feb 2019 Plan received date: 03 June 2019 Date of comments: 27 Mar 2019 Rev. 1 comments: 02 July 2019 Reviewers: Emily Cox Fax (434) 972-4126 County Code section 17-410 and Virginia Code §62.1-44.15:34 requires the VSMP authority to act on any VSMP permit by issuing a project approval or denial. This project is denied. The rationale is given in the comments below. The application may be resubmitted for approval if all of the items below are satisfactorily addressed. The VSMP application content requirements can be found in County Code section 17-401. A. Stormwater Pollution Prevention Plan (SWPPP) The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain (1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary. 1. Provide signed registration statement (section 1) and signed certification (section 9). Rev.1: Plan cannot be approved until these are provided. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. No objections. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved, and the reasons are provided in the comments below. The stormwater management plan content requirements can be found in County Code section 17-403. 1. Proposed conservation easement should be labeled as "SWM Forest & Open Space." Any Forest and Open Space used in the VRRM worksheet will need to be shown on an Easement Plat and labeled as'SWM Forest and Open Space'. Easement plat application can be found here: http://www.albemarle.org/upload/images/forms center/departm ents/Community Development/forms/Subdivision Applications/E Engineering Review Comments Page 2 of 4 asement Plat & Checklist.pdf Rev. 1: Comment addressed, however, please note that plat must be recorded before land disturbance permit can be issued. 2. The following note will need to be placed on both the VSMP plan and the Easement Plat:"The SWM Forest and Open Space Easement is subject to the guidance set forth by DEQ in the Virginia Stormwater Management Program. The areas will remain undisturbed in a natural, vegetated state, except for activities as approved by the local program authority, such as forest management, control of invasive species, replanting and revegetating, passive recreation (e.g., trails), and limited bush hogging to maintain desired vegetative community (but no more than four times a year)." Please also update the note on the cover sheet under stormwater to reference forest & open space, not conservation easements. Also, on Sheet C7.0 in the water quality analysis. Rev. 1: Comment addressed. 3. A SWM maintenance agreement will be necessary before the plan can be approved. Please contact Ana Kilmer (akilmergalbemarle.org or 434-296-5832 ext to begin that process. Rev. 1: Comment not addressed. Please coordinate with Ana Kilmer. 4. Provide SWM facility easement around SWM-1 and the level spreader. Rev. 1: Comment addressed. 5. Show DB&PG for all existing easements. Rev. 1: Comment addressed. 6. Sheet 4 narrative states that stormwater quality is being treated by grass channels and a level 1 extended detention pond, however the design calculations & narrative show forest & open space as the only quality facility. Please clarify. Rev. 1: Comment addressed. 7. The concentrated stormwater flow from SWM-1 must be released into a stormwater conveyance system per 9VAC25-870-66. There is no channel at the current proposed outfall location. The buffer may be disturbed for this outfall, however there must be a mitigation plan for the disturbance. Rev. 1:Comment addressed. 8. Lot 4 appears to need a driveway culvert. Please show size, design, etc on the plan. Rev. 1:Size is shown however design/calculations appear to not be shown. 9. Provide a drainage area map. This should show DA to all culverts, ditches, etc. Rev. 1:Please ensure all areas are clearly identified, for example, the lot 4 driveway culvert DA, and the DA to inlet 202. 10. Road ditch section should be 3:1 or flatter (2:1 is shown). Per VDOT APPENDIX B(1) SUBDIVISION STREET DESIGN GUIDE, FigureB(1)-8, Minimum ditch width (front slope) should be 4 feet or greater, based on slopes of 3:1 or flatter (Gentler slopes promote homeowner maintenance of ditches). Rev. 1: Comment addressed. 11. Please review storm sewer design computations on Sheet C6.0. It appears the lower invert is incorrect, which is showing a slope less than the minimum 0.5%. The profile appears correct. Rev. 1: Rev. 1: Comment addressed. 12. Show calculations for the pipe from the riser to the SWM-1 outfall. Rev. 1: It is unclear where these calculations are shown. 13. Engineering appreciates the hatches and areas shown on Sheet C7.0. It is very useful to distinguish the areas used in the VRRM spreadsheet. @ Rev. 1: Comment acknowledged. 14. Please review analysis point location. The outfall at SWM-1 is the only concentrated stormwater flow. Energy balance can be used at this outfall point. If the current analysis point is used, you must show that all channels to that point are adequate. Also, please address flood protection at that point. Rev. 1: Comment addressed. 15. Provide design calculations for the level spreader. Drainage area, sizing, etc. Rev. I: Show calculation for Q used in level spreader design. (where did the 3.71 CFS come from?) 16. Top of dam elevation on Sheet C7.2 says 537. Believe this should be 557. Please review and revise. Rev. 1: Comment addressed. Engineering Review Comments Page 3 of 4 17. SWM-1 should meet al applicable design requirements for water quantity based on BMP clearinghouse, including side Slopes: Side slopes leading to the ED pond should generally have a gradient of 4H:1 V to 5H:1 V. Section 6.6: https://www.swbmp.vwrrc.vt.edu/wp— content/uploads/2017/11/BMP—Spec—No-15 EXT—DETENTION— POND v 1— 9 0 3 012 011 . pdf Rev. 1: Comment addressed. 18. Provide maintenance requirements for the SWM facilities. Rev. 1: Comment addressed. 19. Provide as -built checklist on the plan. It can be found here: http://www.albemarle.org/upload/images/forms center/departm ents/Community Development/forms/applications/WPO VSMP Cons truction Record Drawings Policy 23May2014 .pdf Rev. 1: Comment addressed. 20. Rev. 1: Mitigation plan should have a planting plan and mitigation area should be in an easement since it is outside of the buffer. Is there a reason is it outside of the buffer? See attached checklist. D. Erosion and Sediment Control Plan (ESCP) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved, and the reasons are provided in the comments below. The erosion control plan content requirements can be found in County Code section 17-402. 1. Provide paved construction entrance detail from page 8 of the Albemarle county design standards manual: hiip://www.albemarle.org/upload/images/forms center/departments/community_ development/for ms/design_ standards_ manual/Albemarle _County _Design_ Standards_Manual _2015-04- 25_draft.pdf Rev. 1: Comment addressed. 2. Provide a wash rack with a place for the water to settle out at the construction entrance. Rev. 1:Provide WR symbol on plan sheet. 3. Provide temporary seeding (TS) symbol on E&S plan. Only permanent seeding was shown. Rev. 1: Mulching should also be shown. 4. Offsite water appears to be draining towards the site from the north. This does not appear to be considered in any of the calculations and drainage areas. Rev. 1: Comment addressed. 5. Provide design specifications for outlet protection (size and dimensions) and specify them on the plans. Detail is not sufficient and requires contractors to try to figure out requirements. Rev. 1: Comment addressed. The VSMP permit application and all plans may be resubmitted for approval when all comments have been satisfactorily addressed. For re -submittals please provide 2 copies of the complete permit package with a completed application form. Engineering plan review staff are available from 2-4 PM on Thursdays, should you require a meeting to discuss this review. Process: After approval, plans will need to be bonded. The bonding process is begun by submitting a bond estimate request form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans. The County's Engineering Review Comments Page 4 of 4 Management Analyst will prepare bond agreement forms, which will need to be completed by the owner and submitted along with cash, certificates or sureties for the amounts specified. The agreements will need to be approved and signed by the County Attorney and County Engineer. This may take 2-4 weeks to obtain all the correct signatures and forms. Stormwater Management Facilities Maintenance agreements will also need to be completed and recorded. The County's Management Analyst or other staff will prepare the forms and check for ownership and signature information. The completed forms will need to be submitted along with court recording fees. After bonding and agreements are complete, county staff will need to enter project information in a DEQ database for state application processing. DEQ will review the application information based on local VSMP authority approval. At this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest processing, this is done electronically with the emails provided on the application. DEQ should notify applicants with instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter. This should be copied to the county. After DEQ coverage is issued, via the coverage letter, the County can hold a pre -construction conference. Applicants will need to complete the request for a pre -construction conference form, and pay the remainder of the application fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid. This will be checked by county staff, and upon approval, a pre -construction conference will be scheduled with the County inspector. At the pre -construction conference, should everything proceed satisfactorily, a joint VSMP and grading permit will be issued by the County so that work may begin. County forms can be found on the county website forms center under engineering; hLtp://www.albemarle.org/deptfonns.asp?department--cdengWpo Albemarle County Engineering Mitigation Plan checklist for plan reviewers Updated 2 Dec 2014 A mitigation plan is a document required by County Code Chapter 17, the Water Protection Ordinance which illustrates stream buffer disturbance and the measures proposed to alleviate or compensate for it. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references, and (regular parenthesis) are explanatory. Links to reference documents are provided where possible. Title information: (applicable to any type of plan) Project title. Titles should be appropriate. It should be a mitigation plan, not a stormwater plan, or erosion control plan, etc. Professional seal, with original signature and date for professionally prepared plans Content: Mitigation Plan (per the Water Protection Ordinance [17-406]) Existing conditions plan view information: (applicable to any type of plan) existing topography (as shown on other final plans in process if applicable) WPO buffer limits; 100' from stream or wetland bank, 200' from reservoirs, or floodplain limit if greater [ 17-600] floodplain limits, including 100yr flood limits for any channel with a drainage area of 50+ acres [18-32.6.2d, 18-30.3] all existing easements (access, drainage, sight, sanitary easements, etc.) with deed book references, locations and dimensions [ 18-32.6.2] all critical slopes (typically shaded) [ 18-32.5.2] Proposed plan view information: (applicable to final site plans, road and drainage plans) proposed topography (as shown on other final plans in process if applicable) all proposed permanent easements, dimensioned and labeled. On a mitigation plans these would typically be; conservation easements any permanent easements proposed on other final plans (such as sewer easements which cannot have plantings) Disturbances: outlined and/or shaded areas of buffer disturbance, with acreages labeled, matching the disturbances shown on the erosion control plan and other final plans if applicable. disturbances are minimized as much as possible [17-406A2] Mitigation: outlined and/or shaded areas of mitigation, with acreage labeled for plantings, mitigation area is equal to double (2x) the disturbed area for channel restoration, 1' of restored channel for every 100sf of disturbed buffer. stations at every 50' min. with existing and proposed cross -sections provided for restoration planting plan for mitigation areas per Riparian Buffers Guidance Manual by CBLAD detail provided for typical spacing (i.e. 20'x20' detail with placement). Albemarle County Engineering Mitigation Plan Checklist Page 2 of 2 native plants used with species, size, planting condition condition specified See the county's native plant database (h!W://www.albemarle.ora/nativeplants/ ) maintenance narrative and schedule on plan, including a completion date. areas restored or replanted for mitigation must be protected in easements or by maintenance agreements if they are not in a buffer. (This is a rarity, as all planting should be buffer restoration or reclamation. Noted exceptions are TJSWCD easement areas.) all concentrated discharges treated or extended to adequate channels to preserve buffers.