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HomeMy WebLinkAboutSDP201100064 Review Comments Preliminary Site Plan 2011-10-12� OF AL ,. vIRGI1`IZP COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 Project: Belvedere Block 1 Preliminary Site Plan (SDP- 2011 - 00064) Plan preparer: Mr. Herb White, PE; W & W Associates Owner: Belvedere Station Land Trust Plan received date: 21 September 2011 Date of comments: 12 October 2011 Reviewer: Phil Custer The preliminary site plan for Belvedere Block 1, received on 21 September 2011, has been reviewed. Engineering review can recommend approval of this plan after the following comments have been addressed. Engineering review notes the following deviations from the approved application plan and Code of Development: -The site plan does not show the Class B Type II trail to Block 2. The trail must be provided because it is included in the Block 1 section of the Code of Development. The applicant should refer to the Reserve at Belvedere Final Site Plan for previously approved trail locations. -The site plan layout does not match the approved application plan. The current proposal does not include a "central access road and plaza space with diagonal parking and pedestrian oriented streetscape." -Trees must be located between the 8ft trail and the back over curb along Belvedere Blvd. VDOT regulations may not allow this. A variation will be needed to prevent the relocation of the 8ft trail 2 -3ft to the east. - Parking has been added on Belvedere Blvd. which goes against Table 8. The applicant must modify the preliminary site plan or request a variation to the Planning Department for the above changes. 2. A critical slope waiver is necessary for this project. A request for critical slope waiver, as outlined by Section 18- 4.2.5.a.1, must be provided to the agent. 3. Please label and specify the area of each Green Space and Park listed in the Code of Development on page 9. Acreages must be at least as large as those listed in Table 4. Please also identify the area of the site that the Code of Development references as Block 1 Green Space that is subject to Section 32.7.9.8. 4. If the trail is moved because of the widening of Belvedere Blvd., new ROW dedication will be necessary. 5. The modified simple spreadsheet must be updated for the entire watershed. The pond cannot be sized for 12% of the drainage area and be expected to be fully functional. Please be sure to treat all of the Belvedere Blvd. impervious area as new, not existing. I understand that there have been agreements between the owner of this pond and the church to the southwest to provide stormwater management. Please update all stormwater calculations accordingly. I imagine a removal rate of 35% will be required of this pond with the Water Quality Volume of the entire watershed. Please provide a volume analysis of this pond. 6. The pond on the property is scheduled for conversion to the permanent stormwater management Albemarle County Community Development Engineering Review Comments Page 2 of 2 facility in the spring of next year. Jack Kelsey, in the General Services Department, is currently managing this project. If approval of the SWM plan for this project is received around that time, the bond will need to be posted by the applicant and the county will cancel the conversion. If the Block 1 project is not moving forward, the pond may be converted which will likely disrupt the WPO application of this project because the pond may not be allowed to be converted back to a sediment basin. The erosion and sediment control plan for this project will be difficult because of the topographic challenges. When preparing your variation request, I recommend thinking about how an approvable erosion and sediment control plan can be designed. The county does not review Erosion and Sediment Control feasibility when approving preliminary applications. Significant ESC phasing requirements could be needed. The following comments will need to be addressed with the WPO and final site plan. 1. The SWM embankment will need to meet the dimensions specified in the VSMH, specifically the 3:1 downstream slope requirement. 2. All retaining walls visible from the street will need to be faced /fronted with brick or stacked field stone. If the applicant wishes not to do this, please include this in the variation request since it was found in the Code of Development. 3. The access path to the stormwater facility must be graveled when grades of 10% or steeper are proposed. The access path will need to be extended to all forebays. 4. A forebay will be required for all inlet points. 5. The downstream channel will need to be analyzed for adequacy per Minimum Standard 19. Please refer to page 7 (of 35) of the county's design manual for expectations of downstream channel analyses.