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Home My WebLink AboutSDP200800084 Review Comments Final Site Plan and Comps. 2008-10-24� 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: WPO- 2008 - 00057, Dunlora Gates E &SC, SWM and Road Plans SDP - 2008 - 00084, Dunlora Gates Site Plan Plan preparer: Mr. Mike Myers PE, The Engineering Groupe fax: 703.670.7769 Owner or rep.: Mr. Jim Gates fax: 434.263.4691 Plan received date: 21 May 2008 Rev: 14 October 2008 Date of comments: 7 July 2008 Rev: 21 October 2008 Reviewer: Phil Custer Rev: John P. Diez The revised E &SC, SWM, and Road plans for Dunlora gates, received on October 14th, have been reviewed. Engineering recommends approval based on the conditions left in the comments. Please submit 10 copies of plans with the latest revised sets. A. General Review Comments 1. Please include the following on the plan: source of topography, date of topography, and a benchmark. (Rev. I) Comment has been addressed Please provide confirmation of the grading easement on the open space adjacent to lot 394. A letter or an email from the property owner will do. (Rev. I) Comment has been addressed Before this plan can be approved, drainage easements will need to be recorded from drainage systems 10 -11 -12 and 9- existing. Storm structure 6 should be moved off of the property line; otherwise, an easement will be needed in this area as well. (Rev. I) Comment has been addressed On the cover sheet, please update all standard county notes for general construction and general construction for streets. These notes are available in the latest edition of the design standards manual which can be found online. (Rev. I) Comment has been addressed B. Site Plan Comments (SDP- 2008 - 00084) 1. A drainage easement is required on the outfall of the biofilter to the stream. (Rev. I) Comment has been addressed 2. A drainage easement is required on storm sewer system 6B -6A -6 and the upstream channel. The width of this easement should be computed using the equation found in the design manual. (Rev. I) Comment has been addressed Albemarle County Community Development Engineering Review Comments Page 2 of 4 3. Please callout a non - grassy, low maintenance groundcover in all areas where grades are steeper than 3:1. [DM] (Rev. I) Comment has been addressed 4. Please show the driveway on lot 394. The new sidewalk in this area does not appear to be long enough. (Rev. I) Comment has been addressed 5. The sidewalk on lot 16 should be angled towards the sidewalk crossing across the street between lots 2 and 3. This crossing should also be angled towards the sidewalk on lot 16. (Rev. I) Comment has been addressed 6. There should be a turn in the sidewalk on lot 384 directing pedestrians across the street (Rev. I) Comment has been addressed 7. Inlet shaping (IS -1) is required on all inlets with a drop of water flow of 4ft or greater. This fall requirement includes drops from the grate of an inlet as well. (Rev. I) Comment has been addressed S. The minimum deflection angle in a storm sewer system is 90 degrees. Please amend the configuration on storm line 6B -6A -6 so that the deflection angle is greater than 90 degrees. (Rev. I) Comment has been addressed 9. The drop connection shown in storm structure 3 is not allowed. Engineering review policy is to have all grade and angle changes occurring in manholes. (Rev. I) Comment has been addressed 10. The easement along the storm system 213-3 -4 should be widened based on the equation in the design manual. (Rev. I) Comment has been addressed C. Road Plan Comments (WPO- 2008 - 00057) 1. VDOT approval is required. VDOT approval has not yet been received at the time of this letter. 2. A crossdrain (CD -1) appears to be needed at Sta. 13 +40. [DM] (Rev. I) Comment has been addressed 3. In addition to the proposed grade elevation, please include the existing grade elevation at each 50ft station in the profiles. [DM] (Rev. I) Comment has been addressed 4. Please provide speed limit signs on the plan. [DM] (Rev. I) Comment has been addressed 5. All driveways should be designed to conform to VDOT standard PE -1. (Rev. I) Comment has been addressed 6. The following comments are typically reviewed by VDOT and, if approved by VDOT, do not need to be amended to obtain county approval. a. Some of the K- values appear to be steeper than the minimum value based upon the design speed. b. For rural road intersections, engineering review maintains a policy that the intersecting cross street continue the 2% cross of the intersected primary street for at least 20ft. 7. A new road bond will be calculated with this application. To request a road bond, the applicant must complete a Subdivision Road Bond Estimate Request and a Schedule of Completion for Bonded Improvements. Albemarle County Community Development Engineering Review Comments Page 3 of 4 D. Erosion and Sediment Control Plan Comments (WPO- 2008 - 00057) 1. The diversion at the southern end of the property should be extended to the SW corner and pulled up the western boundary to the construction entrance. This would satisfy engineering review's requirement of construction entrances draining to trapping measures. The silt fence in the SW corner would need to stay in place. (Rev. 1) Comment has been addressed 2. In phase II of the ESC plan, the back halves of lots 10 -15 do not appear to be adequately protected. A trap or a diversion directing water to sediment basin 1 may be required. (Rev. 1) Comment has been addressed 3. The installation of the sanitary sewer line south of lot 395 will require ESC measures. (Rev. 1) Comment has been addressed 4. Please provide a staging and parking area on the plan. [DM] (Rev. 1) Comment has been addressed 5. Please provide a soil stockpile area. [DM] (Rev. 1) Comment has been addressed 6. In the narrative under "Critical Erosion Areas," please note that all areas steeper than 3:1 will require low maintenanced, non - grassed groundcover. [DM] (Rev. 1) Comment has been addressed 7. The following comments are regarding the sediment basin calculations. a. Barrel from sediment basin is mislabeled as 48" RCP in the detail. (Rev. 1) Comment has been addressed b. Please provide stage - volume tables and volume calculations for the sediment basin. (Rev. 1) Comment has been addressed c. An emergency spillway does not appear to be provided in plan view. Please provide a note calling out the 8ft wide spillway on both sheets 9, 10, and 14. (Rev. 1) Comment has been addressed d. Please submit dewatering orifice calculations. My calculations showed the orifice needed to be 3" (rounded down from 3.8 "). (Rev. 1) Comment has not been addressed. The 3" is labeled in the calculations. However, it still says 5" under the Basin Volume Design (#9) 8. The ESC portion of the WPO bond will be computed once all comments have been addressed. E. Stormwater Management Plan Comments (WPO- 2008 - 00057) 1. The maintenance agreement submitted with the original WPO was recorded with the property and another agreement is not necessary. If a fee was submitted with this latest agreement submittal, please let me know and I will refer you to correct person to obtain a refund. 2. Please show emergency spillway on sheet 14. (Rev. 1) Comment has been addressed 3. The gravel layer in a biofilter must be 1.5ft. [DM] (Rev. 1) Comment has been addressed 4. Please provide a planting schedule for the biofilter meeting the planting quantity requirements of the VSMH. Please also be sure to specify at least 3 species of trees and 3 species of shrub. (Rev. I) Comment has been addressed 5. The SWM portion of the WPO bond will be computed once all comments have been addressed. Albemarle County Community Development Engineering Review Comments Page 4 of 4 The E &SC bond amount is $31,900. The SWM bond amount is $29,500. Please contact Pam Shifflett (Albemarle County Department of Community Development) at ext. 3246 for bonding procedures. Once the E &SC bond and the SWM bond have been posted, you may contact the Department of Community Development to arrange a pre - construction meeting. In addition, should the County Inspector find the limits of disturbance increased or the need for additional control measures required to protect the site, additional fees will be required. Please contact Megan Yaniglos of Current Development Planning at ext. 3004 regarding approval of the Final Site Plan. E2_esc swm rp fsp_JPD_08 -057 Dunlora Gates