Loading...
HomeMy WebLinkAboutWPO201900053 Correspondence 2019-10-25SHIMP ENGINEERING, P.C. Design Focused Engineering October 24, 2019 Engineering Review, c/o WW Associates County of Albemarle Department of Community Development 401 McIntire Road, North Wing Charlottesville, Virginia 22902 RE: WPO 2019-00053 Eco Village — Comment Response 1 Dear WW Associates, Thank you for your review of the VSMP plan for Eco Village. We have revised the plans per your comments dated October 10, 2019.Our responses are as follows: A. Stormwater Pollution Prevention Plan (SWPPP) 1. Notice of general pernlit coverage Notice of general permit coverage cannot be included until the land disturbance permit is issued. We add this document to the SWPPP at the preconstruction meeting. 2. Nature of the activity (use/development of the site, not the E&S controls). It should refer to redevelopment of the site, uUmber of units, parking, private roads, support structures and stornwater controls. The narrative provided properly belongs in Section 4. Noted, this has been corrected. 3. Qualifications and contact information for qualified personnel Qualified personnel have not been selected yet, this will happen after the project has been bidded. A note stating this has been added. 4. Siuned certification Signed certification has been provided. 5. Delegation of authority Delegation of authority will occur at the preconstruction meeting or when a contractor is selected. 6. The cover and site plan sheets state that 36 units will be constructed, althOUL11 it appears that 38 units will be constructed. Please revise wherever it appears. Noted, there was an error in the density bonuses which has been fixed. 7. Please include the WPO number above on the co�cr sheets ofthe plan, SWPPP and calculations. Noted, WPO number included on all documents. 8. Please note that additional comments may be generated based on the response to the comments provided. Noted. B. Stormwater Management Plan (SWMP) 1. Show permanent drainage easement recording information on all parcels crossed by the A1- A-4 Stormwater conveyance piping and structures. 17-304.E. Noted, this is still being obtained. 2. Provide Albemarle County General Construction Notes for Stornnvater Manauenlent Plans (three notes). These notes have been added to the cover sheet. 3. Provide buoyancy calculations for the sedimentation basin riser and the anti -floatation details. Buoyancy calcs have been provided. 4. Revise the principal spillway detail to show the base (see the previous question). 912 E High St. Charlottesville, VA 22902 1434227 5140 1 shimp engineering com Detail has been updated to show the base. 5. Provide calculations that demonstrate compliance with SP201800016, including hydrographs, routing calculations and other necessary documentation that the proposed storniwater system is adequate to manage the 25-year storm without downstream flooding. Calculations demonstrating the BMP's and the storm sewer is adequate for the 25-yr storm has been provided. C. Erosion and -Sediment Control Plan (ESCP_) 1. Sheet C2 has overlapping labels, making them difficult to read. Please revise. Noted, C2 linework and labels have been cleaned up. 2. Sheet C2 does not show all of the disturbed area (omits the sanitary sewer and stormwater piping offsite). Please revise. Offsite disturbed area now shown on C2. 3. Sheet C7 Offsite Areas narrative appears to have a typo. Please clarih . Offsite narrative note updated. 4. Sheet CS: Note on Sheet C2 states that driveways are to remain until Phase 2 of construction. This sheet (Phase 1) shows the sediment basin in conflict with the driveway. Revise to correct conflict. Notation revised to address this situation. 5. Detail references on Sheet CS appear to refer to incorrect detail or sheet numbers. Please revise. Noted, detail references updated. 6. Sheet CS appears to have a stray SF symbol SW of Agnes Road. Clarify or delete. Stray symbol deleted. 7. Sequence of Construction does not mention the Stormtecli system construction. Please include the detention basin in the sequence of construction. Stormtech now addressed in sequence on C10. D. Pollution Prevention Plan (PPP) 1. If fueling will occur onsite, provide location and address it in the plan. Fueling now shown. This area will drain to the basin (phase 1) or a BMP (phase 2) 2. On the Phase 2 sheet, only 10 feet of width bete een the dike and edge of pavement is provided to the dumpster. portajohns and rinse supply area. The extent of the RWD is not provided. Please clarify whether that section of DD is RWD and that service trucks will not clamage the dike. Noted, area updated. Note added to directing that RWD be properly maintained. 3. Table in section C: a. Show the location of the leakproof container for concrete washout. Note added to plan specifying this. b. Show dewaterins, sites oil the plan, and relationship to E&S and/or PPP measures. Shown, around the sediment basin. c. Show material delivery areas on the plans. Shown, near the laydown/storage area d. Solid waste disposal area is downslope of hill; stormwater from this location bypasses all stormwater BMPs. Please show protection of the site from upland runoff and PPP measures for leakage and spills. Solid waste area moved to an area where it will it will not receive upland runoff. Spill kit station has been moved adjacent to this area. e. Vehicle washing. area(s) not shown on the plans. if the activity will occur, show on the plans how the wash water will be handled. Detail for "Paved Wash Rack" (Sheet C 11) shows wash water draining to trapping device. Therefore, provide a trapping device in the vicinity of the construction entrance. Due to the slopes and the nature of the cut in this area, we cannot provide a sediment trap. However we have added a note to provide a trapping device and for wash rack runoff to be pumped into the sediment basin. f. Shoxv a contractor laydown/storage area on the plan. This has been added. ATTACHMENTS: DIGITAL COPY OF WPO APPLICATION DIGITAL COPY OF VSMP PLANS DIGITAL COPY OF SWPPP DIGITAL COPY OF SWM CALC PACKET If you have any questions or concerns about these revisions, please feel free to contact me at keaneAshimp-en 'neering com or by phone at 434-299-9843. Regards, Keane Rucker, EIT Project Manager/Site Design Engineer Shimp Engineering, P.C.