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HomeMy WebLinkAboutWPO201800023 Review Comments WPO VSMP 2018-08-07COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 Phone (434) 296-5832 Fax (434) 972-4126 VSMP Permit Plan Review Project title: Keswick Hall Energy Plant Demolition and Renovation Project file number: WP0201800023 Plan preparer: Timmons Group, Craig Kotarski, P.E. craig.kotarski@timmons.com Owner or rep.: Historic Hotels of Albemarle, LLC, John Trevenen jrevenen@keswick.com Plan received date: 27 March 2018 Plan received date (Revision 1): 19 July 2018 Date of comments: 27 April 2018 Date of comments (Revision 1): 07 August 2018 Reviewer: WW Associates, Inc. County Code section 17-410 and Virginia Code §62.1-44.15:34 requires the VSMP authority to act on any VSMP permit by issuing a project approval or denial. This project is denied. The rationale is given in the comments below. The VSMP application content requirements can be found in County Code section 17-401. A. 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 ESOP, (3) a SWMP, and (4) any TMDL measures necessary. 1. SWPPP Section 1— Please have the owner execute the Registration Statement Certification (Item 12) and resubmit. Delete instructions for filling out the Registration Statement. Revision 1 Response: The registration statement shall be signed prior to final site plan approval. Instructions have been deleted from the registration statement. Revision 1 Comment: Acknowledged. 2. SWPPP Section 2 — Please provide a copy of the DEQ coverage when obtained. Revision 1 Response: Acknowledged, DEQ coverage shall be provided upon request. Revision 1 Comment: Acknowledged. SWPPP Section 7 — Please add the verbiage from subparagraphs (b) and (c) of 9VAC25-880-70 Part I(B)(4). Revision 1 Response: Language from 9VAC25-880-70 Part 1(B)(4) subparagraphs (b) and (c) has been added to Section 7 of the SWPPP. Revision 1 Comment: Comment addressed. 4. SWPPP Section 9 — Complete and sign the certification. Revision 1 Response: Certification to be completed and signed prior to final site plan certification. Revision 1 Comment: Acknowledged. Engineering Review Comments Page 2 of 6 SWPPP Section 10 — Per 9VAC25-880-70 Part K, provide the person with the authority to sign inspection reports or to modify the stormwater pollution prevention plan. Revision 1 Response: Section 10 to be completed once a contractor has been selected. Revision 1 Comment: Acknowledged. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. SWPPP Section 6 PPP meets Albemarle County Code Section 17-404 requirements. Revision 1 Response: Acknowledged. Revision 1 Comment: PPP is approved. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved, and the reasons are provided in the comments below. The stormwater management plan content requirements can be found in County Code section 17-403. Please provide pre- and post -development hydrographs for Water Quantity Analysis Points 1, 2, and 3 and place on the plans. Revision 1 Response: Pre- and post -developed stormwater calculations can be found in separate documents titled "Design Calculations & Narrative" submitted separately to the County for review. A digital copy shall be provided for your use and review. Revision 1 Comment: 2 copies of the post -developed calculations were provided. Please provide the pre -developed calculations. Please provide the pre- and post -development flow path and calculations for all pre- and post - developed drainage areas shown on the plans. Revision 1 Response: Pre- and post -developed flow paths can be found on Sheets C6.0 and C6.1. Revision 1 Comment: Comment partially addressed. Please provide time of concentration flow path for analysis point 3 and provide time of concentration calculations for all three analysis points. 3. Please provide VRRM spreadsheets for Water Quality Analysis and place on the plans. Revision 1 Response: A VRRM spreadsheet can be found in separate documents titled "Design Calculations & Narrative" submitted separately to the County for review. A digital copy shall be provided for your use and review. Revision 1 Comment: The VRRM spreadsheet is incomplete. The portion indicating treatment type selected appears to be cut off (i.e. bioretention and level design). The spreadsheets are to be placed on the plans. 4. Please provide routing of the Bioretention Facility No. 1. Revision 1 Response: Routing for Biorention Facility No.1 can be found in separate documents titled "Design Calculations & Narrative" submitted separately to the County for review. A digital copy shall be provided for your use and review. Revision 1 Comment: Comment addressed. 5. Please provide the planting plan and schedule for Bioretention Facility No. 1. Revision 1 Response: See Sheets L1.00 and L2.00 for planting plan and schedule. Revision 1 Comment: Comment not addressed. Sheets L1.00 and L2.00 not provided with this plan. Engineering Review Comments Page 3 of 6 6. Pretreatment of runoff entering Biofilter No. 1 is required. Please provide. Revision 1 Response: A gabion basket forebay wall has been provided as a method of pretreatment. See Sheet C5.0. Revision 1 Comment: Comment partially addressed. Please provide calculations demonstrating pretreatment volume of 15% of total treatment volume and appropriate calculations demonstrating a 2:1 length -to -width ration per Section 6.4 of the Virginia DEQ Stormwater Design Specification No. 9 (Version 2.0 dated January 1, 2013). 7. Please provide ratio of shortest flow path to overall length calculation and graphically show on the plan. Revision 1 Response: All nyloplast riser structures elevations shall be 0.5 ft. about the bottom of the biofilter. System short-circuiting will not occur. Revision 1 Comment: Comment addressed. Please note that additional comments may be generated based on response to these comments. Revision 1 Response: Acknowledged. Revision 1 Comment: Please note that additional comments may be generated based on response to these comments. D. Erosion and Sediment Control Plan (ESCP) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved, and the reasons are provided in the comments below. The erosion control plan content requirements can be found in County Code section 17-402. Please add WPO201800023 to the cover sheet of the plans and SWPPP. Revision 1 Response: Cover sheet and SWPPP have been updated accordingly. See Sheet C0.0 and SWPPP documentation. Revision 1 Comment: Comment addressed. 2. The County's Critical Resource Plan indicates critical slopes within the limits of clearing and grading/limits of disturbance. Please add the critical slopes within the limits of clearing and grading/limits of disturbance to the plan and label whether managed or preserved. Revision 1 Response: See Sheets C2.1 and C2.2. A critical slopes waiver has been submitted and will be reviewed by the board on September 5"'. Revision 1 Comment: Requested information added to plan. The design consultant denotes that waiver to disturb critical slopes is to be reviewed by the board on September 5, 2018. A land disturbing permit will not be approved until board approval is obtained. Please add limits of clearing and grading/limits of disturbance to demolition Sheet Nos. C2.3 and C2.4. Revision 1 Response: The limits of disturbance have been added to Sheets C2.3 and C2.4. Revision 1 Comment: Comment addressed. 4. Sheet No. C2.3 — Please add removal/demolition X's to the brick walk to the south of the Energy Plant Building and across the drive aisle. Also, there are removal/demolition X's in the referenced drive aisle. Please identify what is to be demolished/removed or delete these X's from the plan. Revision 1 Response: Demolition linework has been revised. The removal/demolition X's within the drive aisle indicate the portion of the drive aisle that will be required to be removed for building construction. See Sheet C4.0. Revision 1 Comment: Comment addressed. Engineering Review Comments Page 4 of 6 Sheet No. C2.3 — On the north side of building to be removed/demolished, a note indicates "see arch/map plans for building and utility removal." Please note which impervious surfaces in this area are being removed/demolished and label as such on this plan sheet. Revision 1 Response: Demolition linework has been revised to reflect the extent of impervious surfaces that are to be removed. Existing energy building to remain. Revision 1 Comment: Comment addressed. 6. Sheet No. C3.1 — Silt fence along the southeast side of the swimming pool area is proposed to be installed perpendicular to contours in several locations. Silt fence is to be installed on contour, not across contours. Please place silt fence on tangent parallel to contour or provide other measures to contain E&S. Revision 1 Response: Silt fence has been revised to be parallel with contours. See Sheets CM and C3.2. Revision 1 Comment: Silt fence has been adjusted. However, limits of disturbance needs to be adjusted such that silt fence is within the limits of disturbance. Please adjust accordingly. 7. Sheet No. C3.1— Silt fence break is noted as a measure to be provided. This control measure is not a Virginia Erosion and Sediment Control -approved device. Please adjust plan accordingly to depict approved control measures or submit a variation request. Revision 1 Response: Acknowledged. The silt fence break has been removed from the plans and E&SC measures have been adjusted accordingly. Revision 1 Comment: Comment addressed. Please add TP tree protection symbol to the legend on E&SC Phases I and II plan sheets. Revision 1 Response: The tree protection symbol has been added to the legend on E&SC Phases 1 and 2. Revision 1 Comment: Comment addressed. 9. The CWD (Clean Water Diversion) is to be released through a stabilized outlet or channel. Please provide a stabilized outlet such as rip -rap outlet protection. Revision 1 Response: CWD will no longer be utilized to convey storm water. See sheet C3.2. Revision 1 Comment: Comment addressed. 10. It is noted that the Phase I (Sheet No. C3.1) Construction Entrance (CE) is not shown on the Phase II E&SC plan Sheet No. C3.3. CE's are to be provided until County E&S Inspector allows removal. Please adjust Phase II E&SC plan to include Phase I CE. Revision 1 Response: E&SC Phase 2 plans have been revised to show construction entrances. See Sheets C3.3 and C3.4. Revision 1 Comment: Comment addressed. 11. Sheet No. C3.3 — Please show the drip line of the existing tree to remain located just south of the SFB symbol. Revision 1 Response: Acknowledged. This tree is to be removed as part of the proposed demolition and improvements incorporated within this plan set. See Sheet C3.3. Revision 1 Comment: Comment addressed. 12. The narrative on Sheet No. C3.0 under offsite areas states that some utility connections will be offsite. These areas are to be shown if ground is to be disturbed to include erosion and control measures. Revision 1 Response: This portion of the narrative has been revised. All utility connections will take place onsite. Revision 1 Comment: Comment not addressed. Note has not been revised as stated. Engineering Review Comments Page 5 of 6 13. Please show stockpile location on plan. Revision 1 Response: A stockpile location has been provided west of the Bioretention Facility 1. See Sheet C3.1. Revision 1 Comment: Comment addressed. 14. Please verify that cut or fill balances have a deficit of 10,000 C.Y. or less. Revision 1 Response: Cut or fill balances will have a deficit of 10,000 C.Y. or less. Revision 1 Comment: Comment addressed. 15. Please identify contractor staging/laydown area and parking area. Revision 1 Response: Staging/laydown areas have been indicated accordingly. See Sheets CM and C3.2. Revision 1 Comment: Comment addressed. 16. A closed conduit storm drain system is shown on the north side of the energy plant. Please provide inlet protection if these structures are inlets. Revision 1 Response: Inlet protection has been providing accordingly. See profile on Sheet C5.0 for structure information. Revision 1 Comment: Comment addressed. 17. Please provide outlet control calculations for the rip -rap at structure 600. Revision 1 Response: Outlet control calculations have been provided for structure 610 (formally structure 600). See Sheet C5.0. Revision 1 Comment: Comment addressed. 18. In accord with VE&SCH Standards and Specifications 3.13 Sediment Traps, the maximum height of the sediment embankment shall be 5 feet as measured from the base of the store outlet (see VE&SCH page III-73 Embankment Cross -Section and page III-74 plate 3.13-1). Sediment trap ST-1 embankment height exceeds this requirement by approximately 5 feet. Please provide an erosion and sediment control measure that meets the VE&SCH requirements for this drainage area. Revision 1 Response: Proposed sediment trap has been relocated further down the slope. Embankment height has been reduced to meet VE&SCH requirements. See Sheet C3.2. Revision 1 Comment: Comment addressed. 19. No drainage computations for the closed conduit storm drain system were provided. Please provide storm drain inlet and storm drain pipe calculations as well as drainage area map for the closed conduit storm drain system. Revision 1 Response: Drainage computations for the closed conduit storm drain system can be found in separate document titled "Design Calculations & Narrative" submitted separately to the County for review. A digital copy shall be provided for your use and review. Revision 1 Comment: Comment addressed. The VSMP permit application and all plans may be resubmitted for approval when all comments have been satisfactorily addressed. For re -submittals please provide 2 copies of the complete permit package with a completed application form. Engineering plan review staff are available from 2-4 PM on Thursdays, should you require a meeting to discuss this review. Engineering Review Comments Page 6 of 6 Process: After approval, plans will need to be bonded. The bonding process is begun by submitting a bond estimate request form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans. The County's Management Analyst will prepare bond agreement forms, which will need to be completed by the owner and submitted along with cash, certificates or sureties for the amounts specified. The agreements will need to be approved and signed by the County Attorney and County Engineer. This may take 2-4 weeks to obtain all the correct signatures and forms. Stormwater Management Facilities Maintenance agreements will also need to be completed and recorded. The County's Management Analyst or other staff will prepare the forms and check for ownership and signature information. The completed forms will need to be submitted along with court recording fees. After bonding and agreements are complete, county staff will need to enter project information in a DEQ database for state application processing. DEQ will review the application information based on local VSMP authority approval. At this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest processing, this is done electronically with the emails provided on the application. DEQ should notify applicants with instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter. This should be copied to the county. After DEQ coverage is issued, via the coverage letter, the County can hold a pre -construction conference. Applicants will need to complete the request for a pre -construction conference form, and pay the remainder of the application fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid. This will be checked by county staff, and upon approval, a pre -construction conference will be scheduled with the County inspector. At the pre -construction conference, should everything proceed satisfactorily, a joint VSMP and grading permit will be issued by the County so that work may begin. County forms can be found on the county website forms center under engineering; hqp://www.albemarle.org/deptforms.asp?department=cdengno File: WP0201800023 Keswick Hall Energy Plant Demolition and Renovation 08-03-18 Revl.doc