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Home My WebLink AboutSDP201900042 Review Comments Initial Site Plan 2019-08-08COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 Phone (434) 296-5832 Fax (434) 972-4126 Site Plan Review Project title: Chattanooga Medical Office Building — Initial Site Plan Project file number: SDP201900042 Plan preparer: John Thiere (Turner Enterprises), 250 W. Main Street, Suite 201, Charlottesville, VA 22902 [ john6btumer-enter2rises.com ] Plan preparer: Timmons Group, Craig Kotarski, P.E. craig.kotarski@timmons.com Owner or rep.: WP Colonnade LLC, 224 141 Street NW, Charlottesville, VA 22903 Plan received date: 3 Jul 2019 Date of comments: 7 Aug 2019; rev. 8 Aug 2019 (to incl Attachments /slight edit (typo)) Plan Coordinator: Paty Saternye Reviewer: John Anderson SDP201900012 General 1. Provide field run surveyed topographic data as basis of Final Site Plan (FSP) design. 2. Source of topographic data is listed as county GIS, but topographic information is inconsistent with GIS. Note especially the centerline of drainage feature, shown off -site on ISP, but on -site in GIS. ISP should be re -submitted with either field run survey, or topographic information consistent with GIS, if GIS is used as basis of Initial Site Plan design. 3. GIS topographic features indicate a drainage feature and show blue stream line that may be a perennial stream. Provide confirmation that drainage is either intermittent or ephemeral, and not a perennial stream. If feature is perennial, establish and show stream buffer on FSP, and revise proposed development design consistent with Ch. 17, Article VI, Stream Buffers. 4. An approved VSMP Plan is pre -requisite to FSP approval. From Engineering perspective, conceptual design shown on C6.0 is sufficient for ISP approval. With VSMP, please include plan note and analysis that consider Colonnade Drive runoff which appears to bypass the site in pre -development condition, but appears partially routed to detention (via relocated DI) in the post -developed condition. Engineering does not object to relocating DI, but requests FSP confirm effect: non -capture (pre- ) vs. capture (post-). Note: with VSMP plan, provide complete calculations, including RV calculations, Energy Balance Eq. 5. SWM Facility /Access easement with deed must be recorded prior to FSP approval. 6. Recommend title sheet note that parcel lies within ACSA service area for water and sewer. 7. Ensure project has all relevant state /federal permits, including Army Corps of Engineers permit for any stream or wetland impacts. 8. Identify existing wetlands, if any (FSP). 9. With FSP, identify area or length of any wetland or stream impacts. 10. Provide detailed retaining wall design prior to FSP approval /ref. attached Retaining Wall Plan checklist. 11. With FSP, provide comprehensive drainage design. Revise to include plan /profile drainage data, tables, elevations, inlet /storm pipe design, etc. and provide inlet capture for hardscape areas to prevent ponding. Please see Drainage Plan review checklist (attached /also, county website). 12. C1.2: Include VDOT ST-1, IS-1 details (MH steps /inlet shaping). C4.0: Engineering Review Comments Page 2 of 5 13. Recommend label typical length of parking space/s (TYP.=18.0'). 14. Provide off -site temporary construction /grading easement for retaining wall construction. Lowest tier wall is approximately 6.0' away from the nearest property line. 15. C5.0: It is Engineering understanding that no grading is allowed within the 20' landscape buffer located parallel to south property line. Revise grading per landscape buffer requirements. 16. L1.0: Recommend review and revise if needed planting design to limit potential conflict between tree canopy and dumpster lift operations, which may require 14' vertical clearance above dumpster pad. Please feel free to call if any questions. Thank you J. Anderson 434.296-5832 -x3069 SDP201900042 Chattanooga Med Office ISP 080719 080819rev.docx Engineering Review Comments Page 3 of 5 Albemarle County Engineering Retaining Wall Plan checklist for plan reviewers 18 Feb 2014 (Use the latest checklist from the Team Services engineering forms site) Any walls supporting roads or necessary infrastructure require engineered plans (not generic manufacturer's details) and computations. {Design Manual, section 81 This will also be required where walls are close to propert lines and there is the danger of affecting neighboring property, either during construction, with later failures, or with pedestrian or vehicle safety. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references, and (regular parenthesis) are explanatory. Links to reference documents are provided where possible. Title information: (applicable to any type of plan) Project title. Professional seal, with original signature and date. [ 18-32.6.1 ] Plans : safety railing shown for retaining walls over 4' high guardrail with VDOT designations or equivalent shown for retaining walls next to parking or travelways VDOT approval for any walls in right-of-way Accurate depiction of horizontal depth (batter) on site plans. All structural reinforcement, steal, or geogrids specified. All dimensions specified Constructability; there should be no vertical cuts on property lines during construction, such that abutting property does not become unstable. Adequate room for consruction needs to be available. Details and sections : typical sections with dimensions shown for all configurations reinforcement layout shown and dimensioned (steel, geogrids, etc.) details for any pipes through, or bridged utilities, or manholes through geogrid Computations Structural computations with original seal and signature for walls over 5' high Accurate surcharges and loadings assumed Materials and dimensions match plans appropriate safety factors used Engineering Review Comments Page 4 of 5 Albemarle County Engineering Drainage Plan checklist for plan reviewers 18 Feb 2014 (Use the latest checklist from the Team Services engineering forms site) A drainage plans is typically a component of a road plan, site plan, or stormwater management plan. It consists of the channel, ditch, culvert, or stormsewer design drawings, drainage maps, and computations for hydrology and hydraulics. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references, and (regular parenthesis) are explanatory. Links to reference documents are provided where possible. A professional seal should be provided for any computation packages where are separate from sealed plans. Drainage: [18-32.6.2d, 14-305, 311 ] drainage area maps (This is a basic element, and without this there is no review) drainage computations (usually in the form of tables from the VDOT Drainage Manual App. 9B-1 LD-2014, App.713-1 LD-268, App., App.8B-1 LD-269, etc. -computations are a basic element, and without them there is no review) all proposed and existing storm sewer must be shown in plan view for residential development, principle access free of flooding during the 25yr storm [14- 410] site runoff and entrances do not drain into streets (from VDOT Drainage Manual 9.4.5.2, 9.4.6.2) concentrated runoff (Icfs or greater) does not run across travelways/streets (as above' following VDOT design) drainage does not run across, through, or backwater in dumpster areas [ 18-4.12.19] overland relief is provided for any drainage structure or inlet in case of clogging. The failure of any system will not cause structures, streets or yards to flood. {Policy} direction of flow change (or deflection angle) in each drainage structure is 90 degrees or greater (flow should not have to reverse direction) (from guide of VDOT Drainage Manual 9.4.9.3.2.3) labels on all drainage structures provided (and should match the drainage computations and profiles) provisions and easements for drainage across 3 or more lots. Dense development where fencing, decking, etc is expected should provide yard inlets and pipes in easements, rather than ditches {Policy} Drainage profiles: (applicable to site plans, road and drainage plans) [14-311, 18-32] drainage profiles for each pipe, structure or channel must contain: existing ground proposed ground any channel linings all utility crossings a VDOT designation (MH-1, DI-3B, etc.) for each structure throat length for each drop inlet Engineering Review Comments Page 5 of 5 grate type for each grate inlet a label on each structure to correspond with the computations material and strength class or gage of each pipe manhole access every 300' for 15"42" or 800' for 48" or greater pipe slopes at 0.5% min. to 16% max. (per VDOT stnds for anchors over 16%) concrete inlet shaping (IS-1) specified on any structure with a 4' or greater drop safety slabs (SL-1) in any structure taller than 12'. top or rim elevation for each structure all invert elevations for each structure (with positive flow drop between inverts). end sections (ES-1) or endwalls (EW-1) on all pipe outlets. Endwalls for culverts 48" or taller scour outlet protection at all outlets, corresponding to computations (Green Brook, OP) Drainage computations: (applicable to any plan proposing pipes, channels, etc.) Pipe computations for all pipes All proposed systems are designed within open channel flow capacities. (HGL computations are not necessary, and should not be relied upon unless the entire system is to be watertight.) For systems within drainage easements, all proposed pipes are a minimum 15" in diameter There are no excessive outlet velocities (> 15fps) Curb inlet computations for any curb inlets on grade All spreads are less than 10' carryover is accounted for 100% capture at entrances so no flow runs out entrances into travel lanes 100% capture, or overland flow of capacity storm, to stormwater management facilities. Typically stormwater management is designed to the 1 Oyear storm, and inlets on grade cannot capture this. Curb inlet computations for any curb inlets in sump conditions All flow depths are below 6" in the capacity table All spreads are less than 10' 100% capture to stormwater management facilities Ditch computations for any ditches ditch linings specified per plans meet velocity requirements Culvert computations for any culverts headwaters < 1.5 x culvert height, and 18" below shoulder elevation of streets. Outlet protection computations for all outlets dimensions and stone sizes for all outfalls Proposed pipe and inlet drainage area map limits of all areas and sub -areas draining to proposed structures, and existing structures or channels which will be impacted acreage of each drainage area as used in computations hydrologic coefficient for each drainage area as used in the computations time of concentration for each drainage area as used in the computations destination structure labeled for each drainage area (if not obvious)