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HomeMy WebLinkAboutWPO201400004 Review Comments 2014-02-03OF ALg vlRGmi� COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 Project: Old Trail Village Blocks 28 & 29B (SDP201400009, WP0201400004, SUB201400092) Plan preparer: Roudabush, Gale & Assoc.[bledbetter @roudabush.com, cmulligan @ roudabush.com] Owner or rep.: MARCH MOUNTAIN PROPERTIES LLC [dave @oldtrailvillage.com] Plan received date: 11 February 2014 (Rev. 1) 9 June 2014 (Road Plans /SUB201400092) (Rev. 1) 12 June 2014 (Site/WPO) Rev.2 29 July 2014 Rev.3 26 Aug 2014 Date of comments: 21 March 2014 (Rev. 1) 23 July 2014 Rev.2 7 Aug 2014 Rev.3 26 Aug 2014 Reviewer: Max Greene (initial); John Anderson Glenn Brooks (this was taken from John's queue for an accelerated review at the request of Dave Brockman to Doug Walker) This is an updated memo for erosion control and stormwater plans received today (26 Aug). The VSMP plans are approved and you can proceed with bonding and grading permits. A new road plan was not received, although we discussed many of those comments in our meeting of last Thursday, the 21s", and they should be easily resolved. The road plan will need to be approved and bonded before final plats can be recommended for approval. Site plan (SDP201400009): Approval to Planning can be recommended for the site plan when other final plans are approved. Street and Utility, drainage plans (SUB210400092): Street and utility plans were not received with revision 2, however these items were reviewed on the site plan, assuming these are the same. A specific street/road plan is required for bonds and plat approvals. 1. VDOT approval is required. 2. Remove the grade breaks in the profiles. Provide vertical curves at these locations. At entrances, a reduced K value of 5 to 10 can be used to transition from the intersected cross - grade. Belgrove Rd.; 10 +00 and 14 +05 Hazel Grove Rd.; 10 +16 and 14 +96 Golf View Dr. 17 +50 Birchen Dr. 10 +00 and 13 +27 Ashlar Ave. 10 +16 Birchen Ln. 12 +50 Birchen Ct. start, middle, end 3. Please provide drainage profiles for the entire stormwater system. (Combining some of these with the road profiles is difficult to read.) 4. Please revise inlet design and computations. (i) Per VDOT Drainage Manual use 0.1% grade to check curb spread flanking sag inlets. Engineering Review Comments Page 2 of 3 (ii) All spreads must be below "' /z travel lane width + gutter width" per VDOT DM table 9 -1. This includes inlets that you have labeled temporary. If overland flow is a problem, stub out a culvert or inlet in the field off the road. (iii) If no inlet are to be provided in smaller roads and alleys, check spreads near the exits of each lane /alley. Account for roll -top curbing. Check capture. Limit flow into intersected streets. Show roll -top transitions at end of radii. 5. Hazel Lane appears to require no- parking on one side, which should be indicated by signs. A 29' width would negate the need for this. (VDOT Road Design Manual app.B, table 1) VSMP: Stormwater Management Plan (WP0201400004): 1. A construction record drawing is needed for the pond. Rev.3: The plan has been clarified to contain as -built information serving as a record drawing. Comment addressed. 2. Please do not use the proposed master stormwater plan sheet, as this contains information that cannot be approved with this plan. It is enough that plans agree with the ZMA approved plans. The ZMA plan would be appropriate to include, but it is not necessary. Rev.3: Comment addressed. 3. There was not enough information with the plans to check routings as summarized on plan sheets. The construction record drawings with drainage areas and details may provide this. Rev.3: This pond was previously approved with the Timmons plan before construction. The information provided is verification of adequacy. Rev.3: The stormwater management plan is approved. VSMP: Erosion and Sediment Control Plan (WP0201400004): 1. Provide a profile and details for the sediment basin as it is to be constructed with this project. Provide all supporting computations and drainage areas per the handbook. (This must be done as a first step in construction activities.) In my experience VDOT does not want the road to act as an embankment or dam. I would have to get VDOT approval for such an arrangement. Rev.3: This comment is being held for possible correct in a later amendment. I do not have a VDOT approval for impounding on the public road culvert, but I am approving the plan based on your word in our meeting of Thursday, 215` of August, last week, in which you said VDOT was OK with it. I will verify. 2. Remove the diversions through the middle of the grading activity. These are not maintainable. It appears to be an attempt to split up the site artificially, to provide traps instead of a basin, which does not appear viable. A basin in front of 123 would appear to address this and the inlet computation. Rev.3: comment addressed. 3. Show permanent seeding symbols on the plans. Rev.3: comment addressed in part. Missing areas will be expected to be permanently seeded within 9 months per county code. Rev.3: The erosion control plan is conditionally approved per comment 1. VSMP: Pollution Prevention Plan (WP0201400004): A pollution prevention plan was not received. A pollution prevention plan is required. Rev.3: The pollution prevention plan has been received. VSMP: SWMPP, Stormwater Pollution Prevention Plan (WP0201400004): Engineering Review Comments Page 3 of 3 Please revise the SWPPP to be specific to this project, and reference or include these specific plans. Please make sure all dates are noted and certifications signed. The EPA template is a good place to start, as noted in the completeness check document sent previously. For existing DEQ permits provide the registration statement and DEQ coverage letter so the area of coverage and fees can be checked. Rev.3: The swppp documents have been received. You have provided a generic document for more than just this project. Under our current DEQ guidance, you would need to have final plans and documents approved for all those areas in the swppp, in order to receive your VSMP permit coverage from the county. As DEQ has issued coverage, I will approve these as they are for now, but I anticipate you will need to amend them in order not to be in violation. VSMP: Mititation Plan (WPO201400004): A mitigation plan was not received. A mitigation plan is required for disturbance to stream buffer. Rev.3: You have indicated that the stream buffer disturbance was a result of a previous phase, so this will be addressed through other projects. Current Development Engineering is available from 2:00 -4 PM on Thursdays to discuss these review comments. File: OTV llh,A, 2X & ")R -07 -1314 OF ALg vlRGmi� COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 Project: Old Trail Village Blocks 28 & 29B (SDP201400009, WP0201400004, SUB201400092) Plan preparer: Roudabush, Gale & Assoc.[bledbetter @roudabush.com, cmulligan @ roudabush.com] Owner or rep.: MARCH MOUNTAIN PROPERTIES LLC [dave @oldtrailvillage.com] Plan received date: 11 February 2014 (Rev. 1) 9 June 2014 (Road Plans /SUB201400092) (Rev. 1) 12 June 2014 (Site/WPO) Rev.2 29 July 2014 Date of comments: 21 March 2014 (Rev. 1) 23 July 2014 Rev.2 7 Aug 2014 Reviewer: Max Greene (initial); John Anderson Glenn Brooks (this was taken from John's queue for an accelerated review at the request of Dave Brockman to Doug Walker) Comments from previous revisions have been removed to help simplify this memo. These are still available for viewing on the CountyView database system. Site plan (SDP201400009): Approval to Planning can be recommended for the site plan when other final plans are approved. Street and Utility, drainage plans (SUB210400092): Street and utility plans were not received with revision 2, however these items were reviewed on the site plan, assuming these are the same. A specific street/road plan is required for bonds and plat approvals. 1. VDOT approval is required. 2. Remove the grade breaks in the profiles. Provide vertical curves at these locations. At entrances, a reduced K value of 5 to 10 can be used to transition from the intersected cross - grade. Belgrove Rd.; 10 +00 and 14 +05 Hazel Grove Rd.; 10 +16 and 14 +96 Golf View Dr. 17 +50 Birchen Dr. 10 +00 and 13 +27 Ashlar Ave. 10 +16 Birchen Ln. 12 +50 Birchen Ct. start, middle, end 3. Please provide drainage profiles for the entire stormwater system. (Combining some of these with the road profiles is difficult to read.) 4. Please revise inlet design and computations. (i) Per VDOT Drainage Manual use 0.1% grade to check curb spread flanking sag inlets. (ii) All spreads must be below "1/2 travel lane width + gutter width" per VDOT DM table 9 -1. This includes inlets that you have labeled temporary. If overland flow is a problem, stub out a culvert or inlet in the field off the road. (iii) If no inlet are to be provided in smaller roads and alleys, check spreads near the exits of each lane /alley. Account for roll -top curbing. Check capture. Limit flow into intersected streets. Engineering Review Comments Page 2 of 2 Show roll -top transitions at end of radii. 5. Hazel Lane appears to require no- parking on one side, which should be indicated by signs. A 29' width would negate the need for this. (VDOT Road Design Manual app.B, table 1) VSMP: Stormwater Management Plan (WP0201400004): 1. A construction record drawing is needed for the pond. 2. Please do not use the proposed master stormwater plan sheet, as this contains information that cannot be approved with this plan. It is enough that plans agree with the ZMA approved plans. The ZMA plan would be appropriate to include, but it is not necessary. 3. There was not enough information with the plans to check routings as summarized on plan sheets. The construction record drawings with drainage areas and details may provide this. VSMP: Erosion and Sediment Control Plan (WP0201400004): 1. Provide a profile and details for the sediment basin as it is to be constructed with this project. Provide all supporting computations and drainage areas per the handbook. (This must be done as a first step in construction activities.) In my experience VDOT does not want the road to act as an embankment or dam. I would have to get VDOT approval for such an arrangement. 2. Remove the diversions through the middle of the grading activity. These are not maintainable. It appears to be an attempt to split up the site artificially, to provide traps instead of a basin, which does not appear viable. A basin in front of 123 would appear to address this and the inlet computation. 3. Show permanent seeding symbols on the plans. VSMP: Pollution Prevention Plan (WP0201400004): A pollution prevention plan was not received. A pollution prevention plan is required. VSMP: SWMPP, Stormwater Pollution Prevention Plan (WP0201400004): Please revise the SWPPP to be specific to this project, and reference or include these specific plans. Please make sure all dates are noted and certifications signed. The EPA template is a good place to start, as noted in the completeness check document sent previously. For existing DEQ permits provide the registration statement and DEQ coverage letter so the area of coverage and fees can be checked. VSMP: Mititation Plan (WP0201400004): A mitigation plan was not received. A mitigation plan is required for disturbance to stream buffer. Due to the level of completeness of this submittal additional comments or conditions may be forthcoming. Also, please refer to the letter on Albemarle County's website regarding the VSMP and future submittals. Link: http:// www.albemarle.org /upload/images /forms center /departments /Community Development/forms/Engineering a nd WPO Forms /Albemarle County VSMP Letter 07- 08- 2014.pdf Current Development Engineering is available from 2:00 -4 PM on Thursdays to discuss these review comments. File: WP0201400004- SDP201400009 -0TV Blocks 28 & 29B- 072314 OF A 4'41 1 ; COUNTY OF ALBEMARLE ®��m Department of Community Development u_ !1 401 McIntire Road Charlottesville,Virginia 22902 VSMP Application Completeness Check Project Title: Old Trail Block 28 and 29B File Number: WPO201400004 Date: 4 Aug 2014 Reviewer: GEB Your application has been checked for completeness per section 17-409 of the County Code. All items must be received and correct for the application to be deemed complete. Received Correct Y N Y N N/A • ❑ Completed application ❑ • ❑ Please provide evidence you have paid the proper fees. You have written VAR100043 on your application, but we do not know what this covers, or what fees were paid. You are using the same number for other projects. • ❑ Signatures of the Property Owners for each parcel affected • ❑ ❑ ❑ ❑ Correct Fees Paid ❑ ❑ ❑ ❑ • Registration Statement on the official DEQ form ❑ ❑ ❑ Please provide a copy of your registration statement • ❑ Erosion and Sediment Control Plan satisfying the requirements of code section 17-402. • ❑ ❑ Temporary and permanent controls in such detail to be reasonably adequate • ❑ ❑ • ❑ Stormwater Management Plan satisfying the requirements of code section 17-403. • ❑ ❑ A detailed plan of the proposed stormwater management facilities • ❑ ❑ ❑ • Pollution Prevention Plan satisfying the requirements of code section 17-404. ❑ ❑ ❑ Details of measures. Washouts,fueling,sanitation ❑ • ❑ • ❑ Stormwater Pollution Prevention Plan satisfying the requirements of code section 17-405. ❑ • ❑ Qualified personnel identified.Operator,Persons to sign inspection reports ❑ • ❑ The swppp document received under separate cover is incomplete. It is not specific to this project, it does not detail any specific measures or plans, and it is unsigned. Please see the EPA and DEQ template at http://water.epa.gov/polwaste/npdes/stormwater/Stormwater-Pollution-Prevention-Plans for- Construction-Activities.cfm ❑ • Mitigation Plan satisfying the requirements of code section 17-406 for any proposed disturbance of stream buffers. ❑ ❑ ❑ Your plan proposes using a trap in the stream buffer, which requires mitigation. ❑ • Requested Variations or Exceptions as provided in code sections 17-407 and 408, if applicable. (SSF,MMT,etc) ❑ ❑ • ❑ • Construction Record Drawings (as-builts) for any existing facilities in the proposal satisfying the requirements of code section 17-422. ❑ ❑ ❑ A construction record drawing is required for existing facilties. You are proposing to use Upper Ballard Pond,an existing facility. 67��y1P COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 Project: Old Trail Village Blocks 28 & 29B (SDP201400009, WP0201400004, SUB201400092) Plan preparer: Roudabush, Gale & Assoc. [cmulligan @roudabush.com] Owner or rep.: MARCH MOUNTAIN PROPERTIES LLC [dave @oldtrailvillage.com] Plan received date: 11 February 2014 (Rev. 1) 9 June 2014 (Road Plans /SUB201400092) (Rev. 1) 12 June 2014 (Site /WPO) Date of comments: 21 March 2014 (Rev. 1) 23 July 2014 Reviewer: Max Greene (initial); John Anderson Please adequately address the following items for final site plan, ESC, and SWM approval per Albemarle County Code: 1. Site plan (SDP201400009): a. Please update the topography to within one year of submittal date. The topography should at least be field verified and stated on the plan with a date of verification. [14 -302, 18- 32.5.2, policy] (Rev. 1) Comment addressed. b. Lot #20 driveways is shown across "Open Space" and appears to have adequate room on the lot for the driveway. Recommend moving driveway off "Open Space" lot. (Rev. 1) Comment not addressed. c. Storm drain pipes are missing from sheet 5 of 26. (Rev. 1) Comment addressed. d. Please provide a bench mark location, elevation and datum for topography. [policy] (Rev. 1) Comment addressed. e. Proposed grading has a mix of contour intervals making the topography difficult to decipher. Please pick either the 1' contour or the 2' contour for consistency. (Rev. 1) Comment addressed. £ Please make sure match lines are correct and page numbers are accurate. (Rev. 1) Comment addressed. g. Please show all buffer limits on plans. (Rev. 1) Comment addressed. h. Buffer disturbance will need a mitigation plan. (Rev. 1) Comment withdrawn. i. Please show critical slopes on the plans. [18 -4.2, 14 -304] (Rev. 1) Comment withdrawn — County -GIS shows trace critical slopes in one location. j. Please show the easements on the plan and check the depth to easement width for excavation limits. [18- 32.6.2.g] (Rev. 1) Comment substantially addressed — Easement schedule, sheet 14, should transfer to plan view; all drainage easements need to be shown. Easement for 228 LF 36" DIA HDPE (pipe 156) between structure 154 and proposed sediment basin is not shown; this pipe is not labeled temporary. k. Please show sight distance lines on landscape plan to verify unobstructed sight easements. Trees may need to be moved out of lines of sight. (Rev. 1) Comment partially addressed. As follow -up, defer to Planning on sight distance -tree conflicts at multiple locations —for example: Addle Hill Road -Golf Drive; Addle Hill -Hazel Grove Lane; Birchin Drive - Belgrove St. 1. Please show road name and traffic sign locations on the plans. (Rev. 1) Comment Engineering Review Comments Page 2 of 4 addressed. m. Please change the line weight for existing pipes so they will not be counted as proposed. (Rev. 1) Comment not addressed —sheet 7: Baywick Circle storm drain lines shown with heavy line weight, identical with proposed lines. n. New: Show 25' radius at Addle Hill Road -Golf View Drive; Golf View Drive -Hazel Grove Lane intersections (sheet 5; site /road plans). o. New: Revise Note, sheet 9, to reference storm sewer schedules on sheet 10, rather than sheet 17. 2. Drainage and road plan (SUB210400092): a. Please show the Stormwater drainage easements on the plan views. [Code Sec. 18- 32.5.2, 18- 32.6.2.d] (Rev. 1) Comment partially addressed —see j., above b. Future storm drainage systems shall have an outlet to prevent them filling with water over time. [structure 144] (Rev. 1) Comment addressed. c. Please show VDOT designations for entrances on the plan. (Rev. 1) Comment withdrawn. d. VDOT approval is required for final plan approvals. (Rev. 1) Comment acknowledged -ref General Construction Note 2, title page, 9 -June -2014 plans. e. Fire /rescue department approval is required for final plan approvals. (Rev. 1) Unclear if addressed - Please confirm that road plans were submitted directly to Albemarle Fire /Rescue. f. Alleys will be designed to prevent stormwater flows from entering intersections. Please use the rural street intersection criteria of continuing the -2% cross grade for a minimum 20' from the edge of pavement of the intersected street down the alley to provide a low point off the intersected street for drainage. (Rev. 1) Comment not addressed; see Belgrove St- Ashlar Ave, Hazel Grove Lane -Golf View Drive intersections. Also: VDOT comment #4, 7 July 2014. Also, relatively flat grades in block 28 indicate potential for nuisance ponding. Show spot elevations and furnish drainage for low points. g. Please show Cross -drain locations on plans at every major cut fill transition or sag with VDOT designations. (Rev. 1) Comment partially addressed. Provide CD -2 at Future Sag, Sta. 22 +45.17, Golf View Drive; CD -1 at Sta. 16 +30f, Addle Hill Road. h. Please update all standard notes as shown in the ACDSM. (Rev. 1) Comment addressed. i. Please check angles of deflections on storm water system. Drainage pipe angles need to be 90 degrees or greater. For example stormwater structures 110 and 117 appear to be less than 90 degrees. (Rev. 1) Comment addressed. j. Please provide drainage profiles for the entire stormwater system. (Rev. 1) Comment partially addressed; See VDOT road plan comment #5, 7 July 2014. (Additional detail/clarification required.) k. Please show inlet shaping for stormwater manhole junctions to reduce the risk of standing water/ breeding areas for mosquitoes. (Rev. 1) Comment not addressed. 1. Pipes with slopes less than 0.5% are too flat and may not be self cleaning. Albemarle County Policy is for all stormwater systems will have a minimum 0.5% slope. (Rev. 1) Comment addressed. m. New: Show 25' radius at Addle Hill Road -Golf View Drive; Golf View Drive -Hazel Grove Lane intersections (sheet 5). n. New: Defer to ACSA on design considerations for MH depth >10 -ft; sheets 13/14. o. New: Separate out on -grade and sag inlets. Use VDOT template or format to show flow, right/left along approach curb at sag inlets. Ensure spread is acceptable, even when temporary. 3. Stormwater Protection (WP0201400004): Engineering Review Comments Page 3 of 4 a. Stormwater management proposal will be addressed by the County Engineer. Update: Meeting scheduled 28 July 2014 to discuss Stormwater Master Plan. b. New: Sheet 9 table values listed: Existing & Direct Runoff Diverted into Upper Ballard Farm Pond; Pre - Developed Ballard Pond Drainage; Post - Developed Ballard Pond Drainage. Purpose of table unclear. Please explain. DA, existing /diverted = 46.6 Ac; pre - developed = 100.94 Ac; post - developed = 152.64 Ac. (There appears to be an MS- 19 issue). c. New: sheet 10 furnishes routing data for sub - catchments and ponds not immediately clear or traceable to post -dev. pond routings (ultimate onsite development) values shown on sheet 9. Sheet 20, 11 Feb 2014 plans included peak discharge graphs that may be helpful, but these are not included with current plan set. We do not understand the sheet 10 data. 4. Erosion and Sediment Control (WP0201400004): a. Blocks 29A & 35A do not appear to be shown correctly. Please show the existing topography now that grading has occurred on Blocks 29A & 35A. [14 -302, 18- 32.5.2, policy] (Rev. 1) Comment addressed. b. Bulk grading plan has a mix of 1' and 2' contour intervals and is inconsistent. Please pick one contour interval to reduce misinterpretation of proposed grading. (Rev. 1) Comment addressed. c. Double row of silt fence do not typically work and are difficult for the contractor to maintain. Please show a sediment trap in the lowest area near the pond. It can be filled in after site stabilization to finished contours shown. (Rev. 1) Comment addressed. d. Please show temporary /permanent seeding on the `Bulk grading Plan ". Seeding will not be required unless project or portions of project will not be completed within the 9 month land disturbance time limit. [Code Sec. 17-207.B.2] (Rev. 1) Comment partially addressed; show permanent seeding (PS) if portions of site will not be completed within the 9 month disturbance limit. e. Sediment basin construction details are required. (Rev. 1) Comment not addressed. Furnish profile view of sediment basin; draw to scale. Show L x W floor dimensions of sediment basin. Provide computations for outlet structures per VESCHB. f. Sediment traps with diversions that bisect the site do not work in the field and are a burden to both the contractor and inspector to maintain the drainage divisions. (Rev. 1) Comment not addressed. This site appears to require a sediment basin. g. Blocks will need E &SC protection to keep mud off the new road construction. This office recommends a sediment trap behind inlet structure #112 with a pipe into the back of structure #112. (Rev. 1) Comment not addressed. h. Silt fence or earth berm draining to control structures should be placed behind sidewalks to protect the new road and sidewalk areas from sedimentation until the vegetation is established. (Rev. 1) Comment addressed. i. Please remove proposed 1' contours or make the whole plan with 1' contours. (Rev. 1) Comment addressed -see b., above. j. Please show the stock pile locations on the plan. (Rev. 1) Comment addressed. k. Please show staging and parking areas for the contractors and other construction related areas. (Rev. 1) Comment addressed. 1. New: General Construction Notes, title sheet, #18 — revise `straw mulch is to be applied at 80 lbs /100 SF' to read `80 lbs /1000 SF.' m. New: Sheet 2, cannot locate adjoining parcel 11; label parcel 11. n. New: Show mulch/dust control (MU /DC). o. New: Show entrance pipe at CE. Furnish IP /OP for this pipe. p. New: Sheet 4, dimension riprap apron (L x W x D), pipe 156 leading to sediment basin. q. New: Add silt fence to tree protection, block 29B, to prevent off -site sediment transport. r. New: Revise DV, north boundary, block 35C, to discharge to existing sediment trap near Upper Ballard Pond (DV appears to discharge on top of embankment, near ST outfall). Engineering Review Comments Page 4 of 4 s. New: Sheet 5: list ST outlet embankment width as 5' for ST 1 and ST2, as 4' for ST 3. t. New: relocate OP2 landward of Upper Ballard Pond; do not show extending into pond. u. New: Show ESC needed to install pipe 155 leading to Upper Ballard Pond. v. New: Sediment basin baffles: show if needed. Specify SB side slopes (2:1, 2.5:1, etc). Due to the level of completeness of this submittal additional comments or conditions may be forthcoming. Also, please refer to the letter on Albemarle County's website regarding the VSMP and future submittals. Link: http: / /www.albemarle.orgLunload /images /forms_ center / departments /Communily Development/forms/Engineering _a nd WPO Forms /Albemarle County VSMP Letter 07- 08- 2014.pdf Current Development Engineering is available from 2:00 -4 PM on Thursdays to discuss these review comments. Please contact John Anderson at 434 -296 -5832 ext. 3069 or email janderson2galbemarle.org to schedule an appointment. File: WP0201400004- SDP201400009 -OTV Blocks 28 & 29B- 072314 Page 1 of 1 From: Max Greene Sent: Monday, March 24, 2014 11:12 AM To: 'Bill Ledbetter'; 'Chris Mulligan'; Dave Brockman Subject: FW: Old Trial Village blocks 28 & 29B Chris, I sent the SWM plans to Glenn for review because I could not figure them out. His response is below, but to recap... Please simplify the approach so the documentation is clear. Since the pond was not submitted as a standalone plan for future development in Old Trail Village, it will need to be only for this specific portion of development. Let me know if you want to meet this Thursday. Thanks, Max From: Glenn Brooks Sent: Monday, March 24, 2014 9:32 AM To: Max Greene Subject: Old Trial Village blocks 28 & 29B Max, The stormwater management for blocks 28 & 29B, shown on sheets 18,19 and 20 of the plan set, has been reviewed. I understand from the note on previous sheets that the Upper Ballard Pond is to be used for stormwater management for these blocks. I don't see these blocks on sheet 18, the drainage areas for the pond. I don't understand what the computations on sheets 19 and 20 are trying to demonstrate. I understand they are routings, of course, but I do not know the target values, or what might have been agreed to with the previous reviews by Michael Koslow. I cannot decipher what the water quality treatment might be when so much off -site area is involved. I cannot tell if as -built data is used for the pond itself. I cannot tell if pipes are proposed on Old Trail drive, as seems to be drawn on sheet 19. There is a mention of 9 acres addressed independently, and I'm not sure what this means. Please have the application try to simply the approach so the documentation is clear, and only for this specific development. The county needs this plan set to demonstrate, for this specific proposed development, water quality compliance in accord with the rezoning, water quantity compliance, and MS -19 compliance. Glenn Brooks, P.E. County Engineer Albemarle County http:// www. albemarle. org /weblink8 /ElectronicFile.aspx ?docid= 101179 &dbid =3 12/12/2014 OF ALg vlttcmi� COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 Project: Old Trail Village Blocks 28 & 29B (SDP201400009, WPO201300065) Plan preparer: Roudabush, Gale & Assoc. [cmulligan@roudabush.com] Owner or rep.: MARCH MOUNTAIN PROPERTIES LLC Plan received date: 11 February 2014 Date of comments: 21 March 2014 Reviewer: Max Greene The site development plans submitted 11 February 2014 have received Engineering Review and do not appear to meet Albemarle County minimum checklist items for approval. Please adequately address the following items for final plan approvals per Albemarle County Code: 1. Site plan: a. Please update the topography to within one year of submittal date. The topography should at least be field verified and stated on the plan with a date of verification. [14 -302, 18- 32.5.2, policy] b. Lot #20 driveways is shown across "Open Space" and appears to have adequate room on the lot for the driveway. Recommend moving driveway off "Open Space" lot. c. Storm drain pipes are missing from sheet 5 of 26. d. Please provide a bench mark location, elevation and datum for topography. [policy] e. Proposed grading has a mix of contour intervals making the topography difficult to decipher. Please pick either the F contour or the 2' contour for consistency. f. Please make sure match lines are correct and page numbers are accurate. g. Please show all buffer limits on plans. h. Buffer disturbance will need a mitigation plan. i. Please show critical slopes on the plans. [18 -4.2, 14 -304] j. Please show the easements on the plan and check the depth to easement width for excavation limits. [18- 32.6.2.g] k. Please show sight distance lines on landscape plan to verify unobstructed sight easements. Trees may need to be moved out of lines of sight. 1. Please show road name and traffic sing locations on the plans. m. Please change the line weight for existing pipes so they will not be counted as proposed. n. 2. Drainage and road: a. Please show the Stormwater drainage easements on the site plan. [Code Sec. 18- 32.5.2, 18- 32.6.2.d] b. Future storm drainage systems shall have an outlet to prevent them filling with water over time. [structure 144] c. Please show VDOT designations for entrances on the plan. d. VDOT approval is required for final plan approvals. Engineering Review Comments Page 2 of 3 e. Fire /rescue department approval is required for final plan approvals. f. Alleys will be designed to prevent stormwater flows from entering intersections. Please use the rural street intersection criteria of continuing the -2% cross grade for a minimum 20' from the edge of pavement of the intersected street down the alley to provide a low point off the intersected street for drainage. g. Please show Cross -drain locations on plans at every major cut fill transition or sag with VDOT designations. h. Please update all standard notes as shown in the ACDSM. i. Please check angles of deflections on storm water system. Drainage pipe angles need to be 90 degrees or greater. For example stormwater structures 110 and 117 appear to be less than 90 degrees. j. Please provide drainage profiles for the entire stormwater system. k. Please show inlet shaping for stormwater manhole junctions to reduce the risk of standing water/ breeding areas for mosquitoes. 1. Pipes with slopes less than 0.5% are too flat and may not be self cleaning. Albemarle County Policy is for all stormwater systems will have a minimum 0.5% slope. 3. Stormwater Protection: a. Stormwater management proposal will be addressed by the County Engineer. 4. Erosion and Sediment Control: a. Blocks 29A & 35A do not appear to be shown correctly. Please show the existing topography now that grading has occurred on Blocks 29A & 35A. [14-302,18- 32.5.2, policy] b. Bulk grading plan has a mix of 1' and 2' contour intervals and is inconsistent. Please pick one contour interval to reduce misinterpretation of proposed grading. c. Double row of silt fence do not typically work and are difficult for the contractor to maintain. Please show a sediment trap in the lowest area near the pond. It can be filled in after site stabilization to finished contours shown. d. Please show temporary /permanent seeding on the `Bulk grading Plan ". Seeding will not be required unless project or portions of project will not be completed within the 9 month land disturbance time limit. [Code Sec. 17-207.B.2] e. Sediment basin construction details are required. f. Sediment traps with diversions that bisect the site do not work in the field and are a burden to both the contractor and inspector to maintain the drainage divisions. Can this side of the project be piped to the sediment basin? g. Blocks will need E &SC protection to keep mud off the new road construction. This office recommends a sediment trap behind inlet structure #112 with a pipe into the back of structure #112. h. Silt fence or earth berm draining to control structures should be placed behind sidewalks to protect the new road and sidewalk areas from sedimentation until the vegetation is established. i. Please remove proposed 1' contours or make the whole plan with 1' contours. j. Please show the stock pile locations on the plan. k. Please show staging and parking areas for the contractors and other construction related areas. Once these comments have been addressed, please submit 3 copies of the revised plans, calculations, and narratives to Current Development Engineering along with the required review fee and transmittal form. Due to the level of completeness of this submittal additional comments or conditions may be forthcoming. Engineering Review Comments Page 3 of 3 Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review comments. Please contact Max Greene at 434 - 296 -5832 ext. 3283 or email mj�reene @albemarle.org to schedule an appointment. [17- 204.f1 An application for an erosion and sediment control plan that requires modifications, terms, or conditions to be included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the omitted modifications, terms or conditions within six (6) months after the owner is informed of the omitted information as provided under paragraph (B).