Loading...
HomeMy WebLinkAboutWPO201600007 Review Comments 2018-07-09 PROJECT MANAGEMENT SHIMP CIVIL ENGINEERING LAND PLANNING ENGINEERING ) July 9'',2018 Mr. Matt Wentland, P.E. Civil Engineer II County of Albemarle Department of Community Development Regarding: Inglewood Terrace— VSMP WPO 2016-00007 Comment Response— Engineering Dear Mr. Wentland, Thank you for your review of the final site plan for Inglewood Terrace. We have revised the plans per County comments dated June 21, 2016. Please find below a detailed comment response letter describing the changes we have made to each of your comments. 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. No SWPPP was included with the submittal and needs to be provided. The SWPPP has been included with this submittal. Stormwater Management Plan (SWMP) 1. Comment addressed. Comment addressed. 2. Comment addressed. The roadway is to be private beginning at the end of state maintenance. A private street request has been submitted. 3. Include all necessary hydrologic and hydraulic analysis for the site, including the VRRM worksheet for Redevelopment and verification the channel leaving the site is adequate. Include the Stormwater conveyance culvert on the LD-229 worksheet. STR-C3D to STR-C3 also appears to be entered incorrectly on the worksheet. The nutrient credits will need to be purchased before plan approval. Please contact Ana Kilmer for information on required document and formatting. • All hydrologic and hydraulic analysis has been included with this submittal included the VRRM worksheet. The LD-229 has been reworked to accurately reflect the stormwater conveyance system. 4. Verify the pipe profiles are correct. B2 and B3 appear to be shown and labelled incorrectly on the profile view. The stub-out is not shown on C4. Drainage information has been removed from the plan. Please provide plan and profile information for the drainage system, including a drainage area map for the inlets. Provide details on weirs/orifices for the detention system and show how the 60" and 72" pipes will be connecting to the MH-1 s that are shown. The labels for B2 and B3 have been revised to depict the correct elevations. The 60" and 72" pipes will now be connecting to JB-ls rather than MH-1s. Details on the weirs/orifices have been added to the plan. A drainage area map for the inlets has been included with this submittal. 5. More detail will be needed where A4 and C4 connect to the retaining wall. Retaining wall/headwall designs will be needed before approval. A4 also does not appear to continue through to the lower wall on the plan sheets. A4 is not to continue through to the lower wall as it will be capped on its end. The retaining wall and headwall will require further design by a third party that has yet to be determined at this time. 6. Comment addressed. Comment addressed. 7. The curb cut on the turnaround is discharging runoff onto the fill slope. The slope will need to be protected from erosion. The current grading shows a ridge in the middle of the swale. The turnaround has been revised to include curb and gutter on all sides. Therefore, the runoff will no longer discharge onto the fill slope. 8. Provide a Stormwater Maintenance agreement for the site. A Stormwater Maintenance agreement has been included with this submittal. 9. Provide plans for the retaining wall and verification that there is no issue with the wall and wall foundation being submerged during storm events. It appears the 100yr storm event overtops the wall and runs into the buildings and neighboring property. Retaining wall plans will be required before approval as the travel way and townhome construction is dependent on the walls and ensure that wall construction does not affect the neighboring property behind Lot 3. The retaining wall requires further design by a third party that has yet to be determined at this time. Page 12 Erosion and Sediment Control Plan (ESCP) 1. Additional erosion control measures should be used below ST1 to ensure runoff does not enter the neighboring property. Demonstrate how ST1 will function during construction. It appears that it will be filled in almost immediately when the storm system and fill slope are installed. Site does not appear adequately protected through all stages of construction. It is also recommended that offsite grading easements are acquired when grading within 5' of the property line. Please schedule a meeting to discuss how to move forward. The stream will be diverted around ST1 during first phase of sewer installation and thus should not fill immediately. If you have any questions please feel free to contact me via e-mail at michael@shimp-engineering.com or Justin Shimp at Justin@shimp-engineering.com or by telephone at 434-227-5140. Sincerely, Michael Chandler Shimp Engineering Page 13