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HomeMy WebLinkAboutSDP202000063 Correspondence 2020-10-05 (6)SHIMP ENGINEERING, P.C. Design Focused Engineering October 5, 2020 John Anderson County of Albemarle Department of Community Development 401 McIntire Road, North Wing Charlottesville, Virginia 22902 RE: Response Letter #1 for SDP202000034 HTC Area C Townhomes - Engineering Dear John, Thank you for your review of the Initial Site Plan request for HTC Area C Townhomes. This letter contains responses to County comments dated May 14, 2020. Our responses are as follows: 1. Include SDP202000034 in revised plan set title. The SDP number is now included in the title of the plans on the cover sheet. 2. C6, block VII a. Private road A i. Road A includes unlabeled ribbon curb adjacent to 10 attached units. Please label. Block VII will be submitted at a later date. ii. Requires Private street authorization request. Block VII will be submitted at a later date. iii. Drainage design does not accommodate sloped recreation area. Block VII will be submitted at a later date. iv. Drainage design does not clearly prevent nuisance conditions at entrances to individual unit garages /driveways (flow lines, drive grades not provided). Block VII will be submitted at a later date. v. Does not include sidewalks or planting strips. Block VII will be submitted at a later date. vi. Label /dimension ribbon curb with ISP resubmittal. Block VII will be submitted at a later date. vii. Provide roadway width label, dimension lines, etc. Block VII will be submitted at a later date. viii. At the NE end of Road A, design shows a turnaround over a sidewalk /pedestrian facility. This design element is rejected. Design may never intentionally co -locate pedestrians and vehicles in the same space (exception: crosswalks). Pedestrians on walks believe they are safe from vehicle strike. Drivers assume a paved surface is available for use. SE is urged to strike this design, and not return to it, again. Instead, propose a more typical layout that separates vehicles and pedestrians except at designated crosswalks. Avoid design that overlays vehicle and pedestrian facilities (sidewalks). Inherent with design at NE end of Road A SHIMP ENGINEERING, P.C. Design Focused Engineering (and NE end of a second unnamed road, block VII) is conflict due to positioning a sidewalk within a turnaround. Eliminate lots, if necessary, to allow adequate separation between sidewalks and travel ways /turnarounds. Engineering stresses fundamental need to respect driver behavior and to recognize individuals with impaired /diminished sensory, cognitive, ambulatory, peripheral, or reaction responses, who may use these walks, and suffer vehicle strike. Were such incident to occur, beyond a preventable tragedy, questions arise: who is at fault? And who would be? Driver may claim s/he was operating within limits by accessing the turnaround. Pedestrian would never expect to be hit by a vehicle on a sidewalk. Design should recognize driver behavioral patterns cued to signs, striping, paved edges, etc., and the range of pedestrians (elderly, children, disabled, parents with strollers, distracted [texting]) who deserve assurance that an approved plan shields sidewalks, that a plan proposing mixed walk/turnaround will be disapproved. It is fine to think creatively. It is unacceptable, however, by engineering standards to propose inherently unsafe design, to not recognize and avoid increased risk to public safety and welfare relating to this design element. Eliminate concept across this and future development plans, despite worthwhile /competing density or affordability goals. Block VII will be submitted at a later date. b. Unnamed road i. Does not appear to meet sidewalk/planting strip requirements for a subdivision. Block VII will be submitted at a later date. ii. Requires private street authorization request. Block VII will be submitted at a later date. iii. Comments elsewhere may also apply to this unnamed road. Block VII will be submitted at a later date. iv. Provide dimension line, leader line/label to indicate pavement width. Block VII will be submitted at a later date. c. For FSP approval i. Provide entrance curb radii. Block VII will be submitted at a later date. ii. Provide typ. curb /gutter (plan view), sections, details. Block VII will be submitted at a later date. iii. Design to private street standards; i.e., VDOT standards. Block VII will be submitted at a later date. iv. Provide linework to show connection between proposed storm pipes, block VII, and existing HTC storm system /network. Block VII will be submitted at a later date. v. Provide complete drainage calculations for proposed storm pipes. Block VII will be submitted at a later date. SHIMP ENGINEERING, P.C. Design Focused Engineering vi. Evaluate capacity of existing storm pipes since flow in Ex. system likely to increase. Block VII will be submitted at a later date. vii. Propose grade to ensure runoff reaches inlets (DI-7 in recreation area, for example). Block VII will be submitted at a later date. viii. Show /label CG-12 ramps at street entrance crosswalk. Block VII will be submitted at a later date. ix. Show /label and provide private drainage easements. Block VII will be submitted at a later date. x. Label Ex. sidewalk width along Laurel Park Lane. Block VII will be submitted at a later date. xi. Show curbs at individual townhouse drive entrances. Block VII will be submitted at a later date. xii. Provide typical civil details. Block VII will be submitted at a later date. xiii. Provide street /traffic control signs. Block VII will be submitted at a later date. xiv. Provide sight lines at block site entrance point/s. Block VII will be submitted at a later date. xv. Item 2.c.xiv. applies to Area C blocks II, III, as well. Block VII will be submitted at a later date. xvi. Provide sight distance easements (with final plat). Block VII will be submitted at a later date. d. Block VII sidewalks may exceed 5% grade; ensure sidewalks meet ADA-accessible requirements. Block VII will be submitted at a later date. e. Walks partially within public ROW, Berkmar Drive, require Maintenance Agreement between Applicant and Albemarle to assign maintenance responsibility to Applicant /subsequent owner. Block VII will be submitted at a later date. f. Recommend lots include no portion of sidewalk fronting Berkmar Drive. Also, next item. Block VII will be submitted at a later date. g. Revise design /lot lines to remove all portions of lots from private streets. Block VII will be submitted at a later date. SHIMP ENGINEERING, P.C. Design Focused Engineering 3. [18-32.5.2.m] For ISP approval Ingress and egress: Show distance to the centerline of the nearest existing street intersection, for each block (11,111, VI1). Distances to nearest intersections are now labeled at each entrance. Please see Sheet C5, & C6. 4. Block I1, III, VII subdivision and final site plan approval (FPT, FSP) requires: a. Approved Road Plan (including utility /drainage) i. Roads must be built or bonded. Acknowledged. ii. Private street authorization request is required; review /approval required. Acknowledged. iii. Variance /exception requests appear to apply to current design (curb /gutter). Acknowledged. b. Approved WPO plan i. WPO plan must ref. Ex. prior -recorded Maintenance Agreement. Acknowledged. ii. WPO plan must link FSP Area C blocks 11, III, V1I to ex. SWM facilities via plan Acknowledged. 5. C5, block III a. Topographic detail is inadequate to evaluate drainage. With revised ISP, provide topography at 2' (or less) such that storm /street design may be evaluated. Acknowledged, the topographic is provided at 2' with this Final Site Plan submission. b. Design to private street (VDOT) standards if private streets proposed [14-412.B.] The lots on Block III have frontage on an existing public street and the proposed road is an alley not a private road. Since there is no private street proposed, designing to private street (VDOT) standard is not applicable. c. Request private street authorization. A request for private street is not applicable because the proposed road is an Alley not a private road. d. Comment_ item 2, C6, above, may also apply. Note: Responses below are to the comments that I thought were applicable for Block III, if there are some that I didn't think were applicable but you think are applicable, please comment back to which ones. i. All curbs have been labeled, please see Sheet C6. ii. Sidewalks, Planting Strip is provided. Please see Sheet C6 and C12 for the landscaping plan. iii. Dimensions & ribbon curbs are labeled, please see Sheet C6. iv. Roadway width and dimension lines are provided on Sheet C6. v. Entrance curb radii are provided on Sheet C6. vi. Typ. Curb & gutter Plan View is provided, the sections are on Sheet CXX and the details are on Sheet CXX. SHIMP ENGINEERING, P.C. Design Focused Engineering vii. Complete drainage calculations are provided with this submission. (LD-204, LD-229 & Inlet drainage Area Maps). viii. The Capacity of the existing DI has been evaluated in the SWM Packet. is. CG-12 is now shown on Sheet C6. x. Private Drainage Easement is now Provided and Labeled. Please see Sheet C6. xi. Sidewalks dimension are all labeled. xii. Street/Traffic Control Signs have been provided. Please see Sheet C6. xiii. All property lines were revised so that the sidewalk in within the ROW and not the Proposed Property line. e. With revised ISP submittal: i. Show sidewalk fronting Lockwood connecting with remnant sidewalk to NE. The sidewalk fronting Lockwood is now shown to connect (up to the property fine) with the remnant sidewalk on the adjacent parcel. Please see Sheet C6. ii. Provide curb with VDOT designation at private driveway entrances to Lots 1 — 10. Acknowledged, curbs have been provided. iii. Label block III subdivision access: street name, private/public, width, dimension lines. Acknowledged, the access has been labeled. Please see sheet C6. iv. Provide CG-12 /pedestrian ramps at crosswalk at subdivision street entrance. Acknowledged, CG-12 is now provided. Please see Sheet C6. v. Show storm system connection with existing storm system. Acknowledged, Storm System Connection is now shown. vi. Note: Show ACSA utility, private drainage, and access /street easements across lots on final plat /final site plan. Planning Div. coordinator may require FSP include deed bk.-pg. reference to recorded final plat. Acknowledged, all easement are shown with their DB-PG. 6. C4, block II a. Provide temporary turnaround for street at Lot 36. Private driveways do not serve as turnarounds. The design has been revised. the turn around is no longer applicable. b. Remove lots from private streets. Property lines have been revised. the Sidewalk with this design falls within the ROW. c. Request private street authorization for streets in block II. Acknowledged, Private Street Request is attached with this Submission. d. Design to private street standards. Ref. 14-412.13. Acknowledged. e. Provide easements. SHIMP ENGINEERING, P.C. Design Focused Engineering Acknowledged, easements are provided. Please see Sheet C5. f. FSP (final site plan) i. Provide detail sufficient to review and approve road, drainage and WPO plans. Acknowledged, WPO plan will be submitted at a later date. ii. Ensure FSP is consistent with road, drainage, and WPO plans. Acknowledged. iii. Provide and record all utility, private storm, access, sight line easements, especially across lots Acknowledged, all utility, private storm, access & sight line easements are provided. Please see Sheet C5. iv. Planning may request deed bk.-pg. reference to recorded final (subdivision /easement) plat be shown on the final site plan. Acknowledged, we understand that the final plat approval must be obtained prior to final site plan approval. v. Final site plan approval requires road /drainage (utility) and WPO plan approval. Acknowledged, we understand that Road Plan, & VSMP plan must be approved prior to the Final Site Plan approval. vi. Final site plan approval may require final plat recordation, with bk.-pg, reference shown on FSP. (defer to Planning.) Acknowledged, we understand that the final plat approval must be obtained prior to final site plan approval. A subdivision Plat will be submitted at a later date. vii. 6' wide sidewalk crossing proposed 7570 SF recreation area turns NE and appears to narrow. Min. sidewalk width =5'. Ensure NE portion of walk meets min. width requirement. Acknowledged, sidewalk have been revised. Please see Sheet C5. viii. Curb, gutter, street requirements listed elsewhere (blocks VII,11I) apply to block II, as well. Acknowledged, Ribbon Curb, CG-6, CG-4, CG-2 & CG-12 are provided for Block II with their details. ix. Label internal street CL radii. All CL Radii are labeled with this submission. x. Show /label CG-12 ramps for proposed or existing sidewalk along Conner Drive. Acknowledged, CG-12 is now shown on Sheet C5. xi. VDOT road design manual (RDM) informs FSP design and will be Engineering reference resource when evaluating Road Plan /drainage design. Acknowledged. SHIMP ENGINEERING, P.C. Design Focused Engineering xii. Rename entrance from Berkmar `Private Road C' (or similar). Planning/GIS may comment on name usage for portions of intersecting streets with a stop condition. Acknowledged, the entrance have been renamed. xiii. Similarly, rename entrance from Conner Drive `Private Road D' or similar. With this revision this is no longer applicable as the road is one continuous piece. xiv. Note: There are at least 4 discrete street sections: 1. Berkmar Drive subdivision entrance (Road A) w /stop condition Acknowledged, please see Road C Section A -A on Sheet C18. The section line Road C A -A is on Sheet C5. 2. Conner Drive entrance with possible stop condition (Road A) Acknowledged, please see Road A Section D-D on Sheet C18. The section line Road A D-D is on Sheet C5. 3. U-shaped interior Road A, with possible stop Acknowledged, all road A sections are on Sheet C18. And the section lines are on Sheet C5. 4. Road B Note: Naming convention may mislead e-911 first responders. Acknowledged, road names will be provided at a later date. xv. Driveways entrances, Lots 22-26 may not be built as proposed, since: 1. These entrances fall near or in a street intersection that requires a yield or stop condition. Design includes a sheet of pavement that includes site entrance from Conner Drive intersection with Road A (which requires stop or yield condition), a radial section of Road A, and Lot 26 and Lot 25 driveway entrances. Separate driveways are now proposed, each with 18 ft minimum length for cars to park off of the street. There is approximately 65 ft throat length at the entrance, enough for 3 cars to queue while someone is pulling out of one of these driveways. 2. This design cannot be approved. The design has been revised such that it is now safe for the vehicles parked and for the (passengers in) vehicles entering the site. 3. Provide intersection sight distance lines. Acknowledged, intersection sight distance is now provided. Please see Sheet C15. 4. Drivers' of vehicles reversing from Lots 22, 23,24 and (possibly) 25 view is obstructed, relative to vehicles entering from Conner Drive. Provide sight lines. Acknowledged, fine of sight is now provided. Please see Sheet C5. 5. Adhere to minimum entrance setback requirements from nearest intersecting street. SHIMP ENGINEERING, P.C. Design Focused Engineering According to Sec 4.12.15(h), the parking areas should be established sufficiently inside the site to prevent queuing onto a public street or private road. Please let me know if there is another section of code with a more specific determination. There is space for 3 cars to queue before the entrance to Lot 26, which is sufficient for the proposed use. 6. Modifying design similar to (constructed) design (below) may provide remedy (separate drive entrances from street —blue circle; HTC Area C, block IV) Acknowledged, we have provided a line of sight instead of modifying the design. Please see sheet C5. Though, we appreciate your research to accommodate our design. xvi. Recommend remove sidewalk fronting Berkmar Drive from lots and show sidewalk in HOA open space. Acknowledged, the sidewalk has been revised. Please see sheet C5. xvii. Recommend locate all sidewalk, including sidewalk between Lots 42-49 and Lots 50-58 in HOA open space. If sidewalk crosses 15 lots, as shown, then future maintenance will involve the interests of 15 individual property owners, rather than HOA (single entity). Acknowledged, the design has revised and now comply with this comment. Please see sheet C5. xviii. Lot lines appears to provide double frontage for multiple lots in block II: Timberwood Blvd, Conner Drive, Berkmar Drive and internal private streets. Engineering defers to Planning on apparent double -frontage. Show connection with existing (off -site) storm drain system. With FSP (road /utility plan) provide comprehensive inlet /culvert calculations, including calculations that demonstrate receiving system pipes located downstream of block II have sufficient capacity to convey increased storm runoff from development impervious area. Acknowledged. 7. Cl: With revised ISP, provide additional SWM Note narrative to reference WPO or SDP plans relied upon for SWM compliance. Acknowledged, SWM packet is provided with this submission. 8. C2: SDP202000034 HTC Area C, block II, III, VII layouts (unit mix, street access, required easements) are strikingly dissimilar from revised Application Plan d. December 18, 2019, which includes no subdivision. Engineering defers to Planning as to whether ISP requires revision to more nearly align with revised "Application Plan." (ZMA201700005 Proffer condition 1). Acknowledged, planning has determined that this layout is acceptable. 9. C3: On revised ISP, include existing improvements not currently shown on adjacent, or on -site parcels. Ref. satellite image, below (blue circle). Acknowledged, the tree line is shown on sheet C4. The parking lot however, is not surveyed due to it falling on the adjacent property. SHIMP ENGINEERING, P.C. Design Focused Engineering 10. With final site plan (FSP): Include demolition details of any existing on- /off -site improvements proposed to be demolished. Acknowledged, Sheet C4 displays everything that is required to be demolished. If you have any questions or concerns about these revisions, please feel free to contact me at Stephaniekshimp-en ing eering com or Justin@shimp-en ine eering com by phone at 434-227-5140. Regards, Stephanie Paul Shimp Engineering, P.C.