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HomeMy WebLinkAboutsdp201000052 Review Comments 2010-08-13r*Nor G��N1P COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 Project: Saint Anne's Belfield; Minor Site Plan Amendment (SDP- 2010 - 00052) Plan preparer: Mr. Kurt Gloeckner, PE Owner or rep.: Saint Anne's Belfield Plan received date: 30 June 2010 Date of comments: 13 August 2010 Reviewer: Phil Custer The first submittal of the minor site plan amendment for the construction of a practice field and 100 space parking lot for Saint Anne's Belfield Private School, received on 30 June 2010, has been reviewed. The following comments must be addressed before engineering review can recommend approval to the plan: 1. Please update the site plan with the removal of the playing field east of the central athletic field. Instead, show what is to remain in the area after the demolition of the existing buildings and parking lots. 2. An amendment to the Erosion and Sediment Control Plan is required for the area. It appears that construction has been operating out of the limits of the previously approved plan for some time. The ESC plan will be required to prove that adequate channels downstream of the development exist. 3. A stormwater management plan is necessary. The stormwater plan will need to provide water quality treatment and detention for the entire limits of this site plan. When the stormwater management plan is submitted, please include a completed County Modified Simple Spreadsheet for the drainage area. Engineering review recommends sizing the facility as if the parking lot is paved so additional disturbance to increase the size of the facility is not needed in the future if a paved lot is ever desired by the school. 4. Water conveyance channels will be required on the east and west sides of the development to route runoff to the BMP, likely positioned southwest of the parking lot, to capture and treat as much runoff as practicable. [17- 312.C] Calculations will be needed for each channel to make sure each segment can carry the 10 -year storm and can pass the 2 -year storm without erosion. Engineering review recommends designing the channel as if the parking lot is paved so additional disturbance to increase the size of the channels is not needed in the future if a paved lot is ever desired by the school. 5. Most of the site appears to have been constructed already. Engineering review recommends that the applicant update the plan with surveyed grades so the plan is more likely to match constructed conditions when completed. This is a recommendation, not a requirement. 6. The waiver of the surface paving and curbing has been approved. However, on the plan, please provide a detail or description of the gravel paving depth. A minimum of 6" depth is needed over the entire lot. 7. Please provide a detail of the "PT 4.0' x 6.0' wood" that is pinned to the ground with rebar. How reliable can these curbs be and where are the concentrated flows released from the parking lot? The ditches required in comment 4 around the perimeter of the site will be adequate for water ` Albemarle County Community Development Engineering Review Comments Page 2 of 2 conveyance. If the curbs are removed, please provide a bumper block in each parking space. Please show the existing VDOT ROW on Faulconer Dr. and the sight distance triangles from the entrance. If either of the signs are within the sight distance triangle or the ROW, they will need to be relocated. 9. Travelways without parking must be a minimum of 20ft wide. [18- 4.12.17.c.1 ] 10. Drainage structures 15, 16, and 17 outlet near the graded area at the intersection of the Faulconer and the school travelway. Please show where the outlet of this drainage system is in relation to the new proposed grading and provide an adequate channel for the concentrated discharge, if necessary. Calculations should be provided to confirm the channel is non - erosive for the 2 -year storm and can carry the 10 -year storm within the banks. 11. Please provide the County's General Construction Notes on the plan. These notes can be found in the latest edition of the design manual, available online. 12. The gravel path is shown at through the 6ft berm at the entrance. Please clarify. 13. There are two callouts for a wall west of the field and north of the field but there does not to be any wall provided. Please clarify. Details will be required for each of the walls. Any wall over a height of 4ft must have a handrail.