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Home My WebLink AboutWPO201500038 Review Comments WPO VSMP 2017-07-10Short Review Comments Report for: WPO201500038 SubApplication Type: Dunlora V - VSMP Stormwater Management/BMP Plan Erosion and Sediment Control Plan Stream Buffer Development Request Date Completed:08/11/2015 Reviewer:John Anderson CDD Engineering Review Status:Denied Reviews Comments: Division: Date Completed: Reviewer:Troy Austin VDOT Review Status:Pending Reviews Comments: Division: Date Completed:10/15/2015 Reviewer:John Anderson CDD Engineering Review Status:Denied Reviews Comments: Division: Date Completed: Reviewer:Troy Austin VDOT Review Status:Pending Reviews Comments: Division: Date Completed:11/29/2015 Reviewer:John Anderson CDD Engineering Review Status:See Recommendations Reviews Comments:Required for SWM Plan Approval: VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is approved pending documentation of nutrient credit purchase, and C6.1 debris rack detail. –SEE #21, New 22; 29 Nov 2015 plan review comments. Required for VSMP Approval: -SWM Plan items (2), above -SWPPP items, 1.-9. -ref. 29 Nov review comments, RMS doc janderson2 11/29/2015 1:48 PM Division: Date Completed:01/27/2016 Reviewer:John Anderson CDD Engineering Review Status:See Recommendations Reviews Comments:Ref. 11/29/15 Engr. WPO plan review comments. Please focus on SWPPP comments; SWMP comments 21-24. Division: Date Completed:02/05/2016 Reviewer:John Anderson CDD Engineering Review Status:See Recommendations Reviews Comments:Need: documentation of Nutrient credit purchase; SWPPP signatures: Sec. 1, Registration Statement; Sec. 9, Signed Certification. janderson2 2/5/2016 7:53 PM Division: Date Completed:03/03/2016 Ana KilmerPage:1 of 2 County of Albemarle Printed On:October 09, 2017 Reviewer:Ana Kilmer CDD Central Intake Review Status:Approved Reviews Comments:2/23/2016 - swa submitted to cdd 2/23/2016 - swa approve by cao 2/26/2016 - swa signed by ce 3/3/2016 - swa recorded at clerks office, deed book 4730, page 703 Division: Date Completed:04/05/2016 Reviewer:John Anderson CDD Engineering Review Status:Approved Reviews Comments:Email: JA -LJ Lopez [3/8/2016 8:13 PM] LJ, Did I overlook Nutrient purchase documentation email? Thanks janderson2 3/8/2016 8:14 PM Update Nutrient Agreement Approved Apr-4-2016 [A. Kilmer email -4/4/2016 4:05 PM] janderson2 4/5/2016 2:29 PM Division: Date Completed:07/10/2017 Reviewer:David James CDD Engineering Review Status:No Objection Reviews Comments: Division: Page:2 of 2 County of Albemarle Printed On:October 09, 2017 OFA \ ' II.I Q�� wi COUNTY 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—Approved Project: Dunlora V—VSMP Plat/Plan preparer: Craig Kotarski,Timmons Group 919 2nd St. SE,Charlottesville,VA 22902 craig.kotarski@timmons.com Owner: Valerie M. Shepherd,26 Clifton Terrace,Weehawken,NJ 07086 Applicant: Milestone Partners,300 2nd St.NE,Charlottesville,VA 22920 lj@milestonepartners.co Plan received date: 22 Jun 2015/e-plans (Rev. 1) 11 Sep 2015/e-plans (Rev.2) 13 Nov 2015/e-plans (Rev.3) 22 Dec 2015 l e-plans (Rev.4) 5 Feb 2016/e-plans (Final) 2 Mar 2016 Date of comments: 11 Aug 2015/e-review (Rev. 1) 15 Oct 2015/e-review (Rev.2) 29 Nov 2015 l e-review—Conditional Approval (Rev.3) 27 Jan 2016/e-review—Conditional Approval (Rev.4) 5 Feb 2016/e-review—Conditional Approval—SWPPP comments (Final) 5 Apr 2016*—Plan Approved Reviewer: John Anderson *"The nutrient agreement was approved today by our county attorney"—email,A.Kilmer 4/4/2016 4:05 PM 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 ESCP,(3)a SWMP,and(4)any TMDL measures necessary. Comments reference hinder dated 22-Jun 2015 --Items 2-7. and 9 Addressed: 1 and 8 r eluire signature. 1. Sec. I,Registration Statement--please sign/date. Not addressed. (Final)Addressed. 2. Sec. 4,5—Revise per comments(recommend wait until ESCP/SWMP conn. sed) Addressed. 3. Sec. 6—Revise plan (1 1" x 17"PPP Exhibit)to show activities listed in Sec. 6.c. Indicate initial locations/ locations may change as project progresses or responsibilities delegated to others. Note:PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. Addressed. 4. Sec. 6.c.—Confirm that'No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. Addressed. 5. Sec. 6.c. —Identify`Existing basketball court to the north.' (carry-over from Henley M.S.?) Addressed. 6. Sec. 6.g.—Sec.explains pollution prevention awareness training shall be provided;two sentences in this section require specific,detailed,pollution prevention awareness training: frequency,how often, content/form of training,etc. Addressed. "IO' Engineering Review Comments Page 2 of 2 7. Sec. 7—Discharge to impaired waters requires enhanced inspection frequency-VAR10 Part I.B.4.d.(i.). Include statement to this effect—increased inspection frequency. Addressed. 8. Sec.9—Signed Certification: sign/date. Not Addressed. (Final)Addressed. 9. Sec. 12—Inspection Logs—inspection required at higher than I week frequency;recommend logs make this explicitly clear. Addressed. B. VSMP: SWPPP: Stormwater Management Plan(WPO201500038) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is approved;prior comments Addressed with prior revisions. Nutrient Agreement Approved. C. VSMP: SWPPP: Erosion Control Plan(WPO201500038) Virginia Code§62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is approved;prior comments Addressed with prior revisions. Process: Project is bonded. Ref.A.Kilmer email:4/4/2016 4:05 PM. County staff will 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. Applicant will need to request a pre-construction conference by completing a 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; http://www.albemarle.org/deptforms.asp?department=cdengwpo Thank you 434.296-5832—x3069 WPO201500038_Dunlora V_VSMP_040516_final Approv 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: Plat/Plan preparer: Owner: Applicant Plan received date: (Rev. 1) (Rev. 2) (Rev. 3) (Rev. 4) Date of comments: (Rev. 1) (Rev. 2) (Rev. 3) (Rev. 4) Reviewer: VSMP Permit plan review Dunlora V —VSMP Craig Kotarski, Timmons Group 919 21 St. SE, Charlottesville, VA 22902 craic.kotarski(a)timmons.com Valerie M. Shepherd, 26 Clifton Terrace, Weehawken, NJ 07086 Milestone Partners, 300 2°a St. NE, Charlottesville, VA 22920 li(a-)milestonepartners. co 22 Jun 2015 / eeplans 11 Sep 2015 / eeplans 13 Nov 2015 / eeplans 22 Dec 2015 / eeplans 5 Feb 2016 / eeplans 11 Aug 2015 / e -review 15 Oct 2015 / e -review 29 Nov 2015 l e -review —Conditional Approval 27 Jan 2016 / e -review —Conditional Approval 5 Feb 2016 / e -review —Conditional Approval —SWPPP comments John Anderson 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. Comments reference binder dated 22 -Jun 2015 Items 2-7, and 9 Addressed: 1 and 8 require signature. 1. Sec. 1, Registration Statement —please sign/date. Not addressed. 2. Sec. 4,5 —Revise per comments (recommend wait until ESCP/SWMP comments addressed) Addressed. 3. Sec. 6 —Revise plan (11" x 17" PPP Exhibit) to show activities listed in Sec. 6.c. Indicate initial locations / locations may change as project progresses or responsibilities delegated to others. Note: PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. Addressed. 4. Sec. 6.c. —Confirm that `No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. Addressed. 5. Sec. 6.c. —Identify `Existing basketball court to the north.' (carry-over from Henley M.S.?) Addressed. 6. Sec. 6.g. —Sec. explains pollution prevention awareness training shall be provided; two sentences in this section require specific, detailed, pollution prevention awareness training: frequency, how often, content/form of training, etc. Addressed. 7. Sec. 7 —Discharge to impaired waters requires enhanced inspection frequency -VAR10 Part I.BAA(1.). Include statement to this effect increased inspection frequency. Addressed. 8. Sec. 9 —Signed Certification: siwVdate. Not Addressed. 9. Sec. 12 —Inspection Logs —inspection required at higher than 1 x week frequency; recommend logs make this explicitly clear. Addressed. Engineering Review Comments Page 2 of 2 B. VSMP: SWPPP: Stormwater Management Plan (WP0201500038) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is approved pending documentation of nutrient credit purchase; prior comments Addressed with this or prior revision (removed for clarity) —ref. County CV database for prior comments. C. VSMP: SWPPP: Erosion Control Plan (WP0201500038) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is approved; prior comments Addressed with this or prior revision (removed for clarity) —ref. CV for prior comments. 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 (complete). One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans (complete). 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 (in process). 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 request a pre -construction conference by completing a 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; http://www.albemarle.org/deptforms.asp?department--cdengmTo Thank you -434.296-5832 —x3069 WP0201500038—Dunlora V_VSMP_020516rev4Approv-conditional—nutrient+consery+Additional TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. February 5, 2016 County of Albemarle John Anderson Community Development 401 McIntire Road, Room 227 Charlottesville, Va. 22902 RE: Dunlora V — WPO Plan Dear Mr. Anderson: 111 West High Street P 434.295.5624 Charlottesville, VA 22902 F 434.295.8317 www.timmons.com We have reviewed all of your remaining comments from January 27`h, 2016 and made the necessary revisions. Please find our responses to the comments below in bold lettering. 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. Comments reference binder dated 22 -Jun 2015 —Recommend re -submit SWPPP since ESC/SWM plan comments have been addressed. (SWPPP contains reduced -size ESC and SWM plans.) Please address items 1-9, below. 1. Sec. 1, Registration Statement please sign/date. 2. Sec. 4,5 —Revise per comments (recommend wait until ESCP/SWMP comments addressed) 3. Sec. 6 —Revise plan (11" x 17" PPP Exhibit) to show activities listed in Sec. 6.c. Indicate initial locations / locations may change as project progresses or responsibilities delegated to others. Note: PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. 4. Sec. 6.c. —Confirm that `No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. 5. Sec. 6.c. —Identify `Existing basketball court to the north.' (carry-over from Henley M.S.?) 6. Sec. 6.g. —Sec. explains pollution prevention awareness training shall be provided; two sentences in this section require specific, detailed, pollution prevention awareness training: frequency, how often, content/form of training, etc. 7. Sec. 7 —Discharge to impaired waters requires enhanced inspection frequency -VAR10 Part I.BAA(I.). Include statement to this effect —increased inspection frequency. Sec. 9 —Signed Certification: sign/date. 9. Sec. 12 —Inspection Logs —inspection required at higher than 1 x week frequency; recommend logs make this explicitly clear Response to SWPPP comments 1-9: 1. We have included a draft of the SWPPP in our electronic submittal. An unsigned, completed registration statement has been provided within the SWPPP. The registration statement will be signed and dated as soon as approval on all other VSMP/WPO comments is grated. CIVIL ENGINEERING I ENVIRONMENTAL I SURVEYING I GIS I LANDSCAPE ARCHITECTURE I CONSTRUCTION SERVICES 00000 0 0 TIMMONS GROUF- YOUR VISION ACHIEVED THROUGH OURS 2. Current E&SC and Stormwater Management Plans have been provided. 3. PPP plan has been provided. The PPP exhibit and included E&SC plans address the items laid out in Section 6. 4. A concrete washout location has been specified on the PPP. Section 6C has been revised. S. Delivery and storage has been revised to area adjacent to construction entrance and trailer. 6. More detail has been added to this note to further describe pollution prevention awareness training. 7. The language regarding increased inspections from VAR 10 have been added to section 7. 8. An unsigned certification has been provided. These will be signed, and slipped into the SWPPP as soon as we receive approval on all other VSMP / WPO comments. 9. Inspection frequency specifications have been provided under section 12. 22. New: Provide debris rack/cage TYP. detail for weir plate orifices, sheet C6.1 (Max. opening: <2"). Note: with future projects, please ensure control orifice 3" Min. DIA. Current design, detention system 1 orifice =2.5" (9/11 design: 3"). We defer to Timmons design judgment in this instance as partial offset to cul- de-sac design effort. In the future (other projects), please ensure orifice control design meets 3" Min. DIA. (Rev. 3) Not addressed. Trash rack call out and detail has been provided on sheet C6.1 23. New: Remove sheet C1.1 (Road Plan Notes and Details). Sheet removed. 24. New: Provide SAF at each sediment trap (ESC plan). Safety fencing has been provided for each sediment trap. We have electronically submitted the plans, calculations, and SWPPP to Albemarle County for your review. If you have any questions or comments, please feel free to give me a call at 434.962.4337. We will submit hard copies of the plans as soon as we receive your approval. Sincerely, Clint Shifflett, P.E. Project Engineer 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: Plat/Plan preparer: Owner: Applicant Plan received date: (Rev. 1) (Rev. 2) (Rev. 3) Date of comments: (Rev. 1) (Rev. 2) (Rev. 3) Reviewer: VSMP Permit plan review Dunlora V —VSMP Craig Kotarski, Timmons Group 919 21 St. SE, Charlottesville, VA 22902 craic.kotarski(a)timmons.com Valerie M. Shepherd, 26 Clifton Terrace, Weehawken, NJ 07086 Milestone Partners, 300 2°a St. NE, Charlottesville, VA 22920 li(a-)milestonepartners. co 22 Jun 2015 / ee plans 11 Sep 2015 / ee plans 13 Nov 2015 / ee plans 22 Dec 2015 / ee plans 11 Aug 2015 / e -review 15 Oct 2015 / e -review 29 Nov 2015 / e -review —Conditional Approval —ref. SWM Plan, below 27 Jan 2016 / e -review —Conditional Approval —SWPPP/SWM comments, below John Anderson 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. Comments reference binder dated 22 -Jun 2015 —Recommend re -submit SWPPP since ESC/SWM plan comments have been addressed. (SWPPP contains reduced -size ESC and SWM plans.) —Please address items 1-9, below. 1. Sec. 1, Registration Statement—please sign/date. 2. Sec. 4,5 —Revise per comments (recommend wait until ESCP/SWMP comments addressed) 3. Sec. 6 —Revise plan (I F x 17" PPP Exhibit) to show activities listed in Sec. 6.c. Indicate initial locations / locations may change as project progresses or responsibilities delegated to others. Note: PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. 4. Sec. 6.c. —Confirm that `No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. 5. Sec. 6.c. —Identify `Existing basketball court to the north.' (carry-over from Henley M.S.?) 6. Sec. 6.g. —Sec. explains pollution prevention awareness training shall be provided; two sentences in this section require specific, detailed, pollution prevention awareness training: frequency, how often, content/form of training, etc. 7. Sec. 7 —Discharge to impaired waters requires enhanced inspection frequency -VAR10 Part 1.13.4.d.(L). Include statement to this effect —increased inspection frequency. 8. Sec. 9 —Signed Certification: sign/date. 9. Sec. 12 —Inspection Logs —inspection required at higher than 1 x week frequency; recommend logs make this explicitly clear. B. VSMP: SWPPP: Stormwater Management Plan (WP0201500038) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is Engineering Review Comments Page 2 of 4 approved pending documentation of nutrient credit purchase; C6.1 debris rack (detail); SAF. 421, 22 BELow. Also: New 23, 24, below. 1. Str. 206 appears to be a MH (C5.1) with 15" DIA pipe upstream, 24" DIA pipe downstream (pipe storage I - pipe storage 2 profile; C7.0), but weir plate in Str. 206 detail (C6.1) shows weir plate within 72" storage system #1. Coordinate design across plan sheets. Note: other weir plates are within storage systems. 2. C6.1 -All weir plates: Although details are NTS, approximate scale is helpful. Recommend adjust NTS 10" orifice to closely approximate 10", relative to 6' pipe. Adjust leader line arrow to point to top of weir plate in Str. 104 detail. 3. C6.1 -Revise `top of 4'/6' weir plate' labels for consistency; `top of 6' weir plate' appears accurate. 4. C6.1 -Please add storage system numbers (1, 2, or 3) to each weir plate detail. s 1. - 4. Discussed 14 -Oct, in Wine form, anticipate profile/detail r�. As follow-up, please show weir plate (details) as 96" DIA/circular, not rectangular. Label DIA. Also, if top of weirs is not horizontal but coincides with top of 96" pipes, evaluate routings. Revise routings as necessary. Note: From routings: storage system #1 please compare with detail. Revise C6.1 details + routings, as necessary (for example, if weir plate section #1 is shown circular/accurate, ensure this shape/dimension is modeled accurately in routings.) (Rev. 2) Addressed. #4 Device 1 458.00' 4.0' long Sharp -Crested Rectangular Weir 2 End Contractions) 0.6' Crest Height From routings: storage system #2 -please compare with detail. Revise C6.1 details + routings, as necessary (for example, if weir plate section #2 is shown circular/accurate, ensure this shape/dimension is modeled accurately in routings.) #4 Device 1 470.59' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) 1.1' Crest Height 5. C5.0 -Label storage system #3 pipe outfall Str. number (unlabeled). (Rev. 1) NA -system #3 removed. 6. C5.0 -Storage System #1 L =102 LF, but routings list L as 111 LF -reconcile. Provide notes/labels if system connections account for difference. (Rev. 1) NA -Storage system configuration revised. 7. C5.0 -Storage System #2 L =275 LF, but routings list L as 300 LF -reconcile. Provide notes/labels if system connections account for difference. (Rev. 1) NA -Storage system configuration revised. 8. C6.1 -Weir plate in Str. 104 detail shows 0.2' weir crest height. Routings list 0.6' weir crest height. Please reconcile. (Rev. 1) NA -Storage system configuration revised. Also, see comments 1. - 4. Note, above. 9. C7.0 -Pipe storage 1 pipe storage 2 profile indicates primary outlet device, storage system #1 is 12.86' of 15" DIA RCP. Routings indicate 41.4' of 24" DIA CMP. Please reconcile. (Rev. 1) Addressed. 10. C7.0 pipe storage 1 -pipe storage 2 profile: revise 12.86' of 15 RCP @ 0.00% to 0.50% minimum. Ref. Alb. county review checklist. (third item, p.-2: hqp://www.albemarle.orv-/Mload/images/forms center/departments/Community Development/forms/Engineering and WPO Forms/Engineering Review Drainage Plans Checklist 1Dec2014.pdf ) (Rev. 1) Addressed. 11. C7.0 -Pipe storage .1 -pipe storage 2 profile indicates 0.00% slope. Routing indicates 0.0203%. Reconcile. 12. Recommend 0.5% slope (0.005'/'), Min., for detention systems. (Rev. 1) Addressed. Asfollow-up, since bottom elevations of systems vary, please label profile view system floor elev. relative to entry/exit points. For example, if system #2 is flat along E -W portions to prevent ponding in dead ends, since 0.5% X 60.0' -0.3', it appears that bottom elev. of the N -end of the 60' L, N -S main section (profile STR224-STR212 /system #2) would be 464.3'. Likewise, system #1 bottom elevation near point str. #105 enters the system is 27'± X0.005, or 0.135'± higher than 451.50' (INV out/Str. #103), or 451.64'±. Care should betaken in labeling profile elevations. For example, spatial relationships shown in STR112-STR106 profile do not exist. Str. #105 enters near midpoint, not at the end of 68' L, 96" DIA pipe. Please consider dashed lines (profile views) to indicate pipes continue beyond solid lines that show 96" DIA pipes ending in certain profile views. Plan views show spatial relationship. Recommend no slope for system #2 E -W (35', 65') sections -labels could help clarify. (Rev. 2) Addressed. 13. Label detention/storage system line length in profile, for clarity. (Rev. 1) Addressed. Engineering Review Comments Page 3 of 4 14. Label detention/storage individual line lengths, C5.0, for clarity. (Rev. 1) Addressed. 15. C7.0 -Str. 201 Ex. 1 profile shows 80.91' of 15" RCP @ 1.06%. Routing shows primary outlet device of storage system #2 shows 20 LF of CMP @ 1.7%. Reconcile. (Rev. 1) NA, with redesign, but as follow-up, please confirm routing system #1 (Vol #1) INV =451.50', system #2 (Vol #1) INV =464.00'. Also, item #12, above. Revise routings as necessary. (Rev. 2) Addressed. 16. C1.2/C1.0 -Correlate Site Land Cover Summary, 0.80 AC. FOREST with Preserved Woods and Open Space Exhibit. Unclear if (exhibit) preserved woods/open space exactly matches 0.80 Ac. spreadsheet value. A label would be helpful since correlation is difficult. Also, 0.80 Ac. value affects water quality 2.89 lb/yr phosphorus load reduction. This acreage must be conserved. Provide preservation/conservation easements for 0.80 Ac. on sheet C1.0. (Rev. 1) Addressed. Per discussion w/ C. Kotarski, 14 -Oct, Final Plat to show and record conservation easements. 17. Indicate and label preserved woods on L1.0. List acreage consistent with VaRRM.xls (0.80 Ac). (Rev. 1) Addressed. Ref. sheet C0.0. 18. C4.0 -With request to 96' cul-de-sac, storage system at Int. Road A/B appears problematic. VDOT comment on facilities within public RW is relevant. VDOT may prohibit SWM facilities within RW. Also, schematic (plat) plan view shows all three stormwater storage systems virtually touching sidewalks. Increase distance to grade -level improvements if possible. Provide Private Drainage Easements on Lots 9 and 19 based on trench side -slope required to excavate or replace storage systems in the future. (Rev. 1) Addressed. 19. Remove sheets: C1.1, C1.2, C1.3 (or delete all except Typ. F&C + Typ. Storm Sewer MH Detail), C7.1, C7.2, and L1.1. (Rev. 1) Addressed. 20. Provide TYP. Storm Sewer MH Detail. (Rev. 1) Addressed. 21. Provide documentation of purchase of nutrient credits: (Rev. 1) Applicant response, 10 -Sep letter: "Documentation of nutrient credit purchase will be provided before final approval." E. Documentation of the applicant's acquisition of nutrient credits shall be provided to the VSMP authority and the Department in a certification from the credit provider documenting the number of phosphorus nutrient credits acquired and the associated ratio of nitrogen nutrient credits at the credit -generating entity. Until the effective date of regulations establishing application fees in accordance with § 62.1-44.19:20, the credit provider shall pay the Department a water quality enhancement fee equal to six percent of the amount paid by the applicant for the credits. Such fee shall be deposited into the Virginia Stormwater Management Fund established by § 62.1-94.15:29. 22. New: Provide debris rack/cage TYP. detail for weir plate orifices, sheet C6.1 (Max. opening: <2"). Note: with future projects, please ensure control orifice 3" Min. DIA. Current design, detention system I orifice =2.5" (9/11 design: 3"). We defer to Timmons design judgment in this instance as partial offset to cul-de- sac design effort. In the future (other projects), please ensure orifice control design meets 3" Min. DIA. (Rev. 3) Not addressed. 23. New: Remove sheet C1.1 (Road Plan Notes and Details). 24. New: Provide SAF at each sediment trap (ESC plan). C. VSMP: SWPPP: Erosion Control Plan (WPO201500038) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is approved. 1. Revise top of dam elevation, ST#3. (Rev. 1) Addressed. 2. Phase 1 ESC Plan, C3.2 shows installation of perimeter controls and traps, but not rough grading while phase 2 appears controlled with SF only. Although sequence makes clear that rough grading occurs with phase 1, please show rough grade (contours) upslope of diversion dikes/traps on C3.2. (Rev. 1) Addressed. 3. Revise sequence of installation, phase 1, note 1: Pre -construction to take place at county office building. (Rev. 1) Addressed. 4. C3.0 -Provide Paved Wash Rack detail -ref. ACDSM./pg.-8. (Rev. 1) Addressed. Engineering Review Comments Page 4 of 4 5. Transfer/copy bottom trap dimensions from design tables, C3.1 to C3.2, to aid construction and inspection. (Rev. 1) Partially addressed —as follow-up, please label sediment trap L X W dimensions in plan view. (Rev. 2) Addressed. 6. Show soil stockpile location, if any. (Rev. 1) Addressed. 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 (complete). One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans (complete). 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 (in process). 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 request a pre -construction conference by completing a 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; htt2://www.albemarle.org/deptforms.asp?departrnent--cdengmMo Thank you -434.296-5832 —x3069 WP0201500038—Dunlora V—VSMP-012716rev3Approv-conditional—nutrient+conserv+Additional `mss!!• TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. December 17, 2015 Virginia Department of Transportation Troy Austin, P.E. Area Land Use Engineer Culpeper District RE: Dunlora V —Road Plan Dear Mr. Austin: We have reviewed all of your comments from December 9`h, 2015 and made the necessary revisions. Please find our responses to the comments below in bold lettering. 1. The tick marks should be added to the road centerlines in plan view. Tick marks have been added to the Road Centerline. Refer to sheet C3.0. 2. There is a note on sheet C4,0 indicating that structure 100 will be tied to the existing pipe. I understand that the 18" RCP under Shepherd's Ridge Road will be replaced with 15" HDPE, however, the note on sheet C4.0 could be interpreted that the structure will be connected to the existing 18" RCP. It appears that this note should be removed. This note has been removed from the plan. 3. The label for structure 214 is overlaying the spot elevation label. For clarity, one of the labels should be shifted. The structure labeling for 214 has been revised. 4. The hydraulic calculations have not been provided to me for review. Two PDF files titled "Calc—Book" have been electronically submitted to Albemarle County and include all hydraulic / hydrologic calculations. Please let us know if they are not passed on you, so we can get them to you directly. R:\103\36167-Dunlora—Subdivision\Docs\2-Design\Letters\PRELIM PLAT (090415)\Comment Response From Timmons N O a, N N 1 N .j 0 L b L U W Vi V) L N a% a, M Cq Ln a% N rn V_ 9 V, N ID Li LO a• N E 0 C Q E December 17, 2015 Page 2 of 2 5. Once the above items have been addressed and the hydraulic calculations have been reviewed and approved, two sets of signed hardcopies of these pians need to be provided to this office. Note, review of the hydraulic calculations may potentially generate additional comments. Acknowledged. Two sets of signed hardcopies of the plans will be provided once reviewed and approved. We have electronically submitted the plans and calculations to Albemarle County for your review. If you have any questions or comments, please feel free to give me a call at 434.327.1690. Sincerely, Clint Shifflett, P.E. Project Engineer R:\103\36167-Dunlora_Subdivision\Docs\2-Design\Letters\PRELIM PLAT (090415)\Comment Response From Timmons pF A vt�r�1Q 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: Plat/Plan preparer: Owner: Applicant Plan received date: (Rev. 1): (Rev. 2) Date of comments: (Rev. 1): (Rev. 2) Reviewer: VSMP Permit plan review Dunlora V —VSMP Craig Kotarski, Timmons Group 919 21 St. SE, Charlottesville, VA 22902 craic.kotarski(a)timmons.com Valerie M. Shepherd, 26 Clifton Terrace, Weehawken, NJ 07086 Milestone Partners, 300 2 °a St. NE, Charlottesville, VA 22920 li(a-)milestonepartners. co 22 Jun 2015 / ee plans 11 Sep 2015 / ee plans 13 Nov 2015 / ee plans 11 Aug 2015 / e- review 15 Oct 2015 / e- review 29 Nov 2015 / e- review — Conditional Approval —ref. SWM Plan, below John Anderson 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. Comments reference binder dated 22 -Jun 2015 — Recommend re- submit SWPPP since ESC /SWM plan comments have been addressed. (SWPPP contains reduced -size ESC and SWM plans.) — Please address items 1 -9. below. 1. Sec. 1, Registration Statement — please sign/date. 2. Sec. 4,5 — Revise per comments (recommend wait until ESCP /SWMP comments addressed) 3. Sec. 6 — Revise plan (I F x 17" PPP Exhibit) to show activities listed in Sec. 6.c. Indicate initial locations / locations may change as project progresses or responsibilities delegated to others. Note: PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. 4. Sec. 6.c. — Confirm that `No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. 5. Sec. 6.c. — Identify `Existing basketball court to the north.' (carry-over from Henley M.S. ?) 6. Sec. 6.g. —Sec. explains pollution prevention awareness training shall be provided; two sentences in this section require specific, detailed, pollution prevention awareness training: frequency, how often, content/form of training, etc. 7. Sec. 7 — Discharge to impaired waters requires enhanced inspection frequency -VAR10 Part I.13.4.d.(L). Include statement to this effect — increased inspection frequency. 8. Sec. 9 — Signed Certification: sign/date. 9. Sec. 12 — Inspection Logs — inspection required at higher than 1 x week frequency; recommend logs make this explicitly clear. B. VSMP: SWPPP: Stormwater Management Plan (WP0201500038) VSMP Regulation 9VAC25- 870 -108 requires the VSMP authority to approve or disapprove a SWMP. This plan is aRproved pending documentation of nutrient credit purchase, and C6.1 debris rack detail. —SEE #21, New 22 BELOW. Engineering Review Comments Page 2 of 4 1. Str. 206 appears to be a MH (C5.1) with 15" DIA pipe upstream, 24" DIA pipe downstream (pipe storage 1 - pipe storage 2 profile; C7.0), but weir plate in Str. 206 detail (C6.1) shows weir plate within 72" storage system #1. Coordinate design across plan sheets. Note: other weir plates are within storage systems. 2. C6.1 -All weir plates: Although details are NTS, approximate scale is helpful. Recommend adjust NTS 10" orifice to closely approximate 10 ", relative to 6' pipe. Adjust leader line arrow to point to top of weir plate in Str. 104 detail. 3. C6.1 - Revise `top of 4'/6' weir plate' labels for consistency; `top of 6' weir plate' appears accurate. 4. C6.1 - Please add storage system numbers (1, 2, or 3) to each weir plate detail. 'scussa�tarski, 14 -0 anticipate mofil As follow-up, please show weir plate (details) as 96" DIA/circular, not rectangular. Label DIA. Also, if top of weirs is not horizontal but coincides with top of 96" pipes, evaluate routings. Revise routings as necessary. Note: From routings: storage system #1 please compare with detail. Revise C6.1 details + routings, as necessary (for example, if weir plate section #1 is shown circular /accurate, ensure this shape /dimension is modeled accurately in routings.) (Rev. 2) Addressed. #4 Device 1 458.00' 4.0' long Sharp - Crested Rectangular Weir 2 End Contraction(s) 0.6' Crest Height From routings: storage system #2 - please compare with detail. Revise C6.1 details + routings, as necessary (for example, if weir plate section #2 is shown circular /accurate, ensure this shape /dimension is modeled accurately in routings.) #4 Device 1 470.59' 4.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s) 1.1' Crest Height 5. C5.0 -Label storage system #3 pipe outfall Str. number (unlabeled). (Rev. 1) NA - system #3 removed. 6. C5.0 - Storage System #1 L =102 LF, but routings list L as 111 LF - reconcile. Provide notes /labels if system connections account for difference. (Rev. 1) NA - Storage system configuration revised. 7. C5.0 - Storage System #2 L =275 LF, but routings list L as 300 LF - reconcile. Provide notes /labels if system connections account for difference. (Rev. 1) NA - Storage system configuration revised. 8. C6.1 -Weir plate in Str. 104 detail shows 0.2' weir crest height. Routings list 0.6' weir crest height. Please reconcile. (Rev. 1) NA - Storage system configuration revised. Also, see comments 1. - 4. Note, above. 9. C7.0 -Pipe storage 1 pipe storage 2 profile indicates primary outlet device, storage system #1 is 12.86' of 15" DIA RCP. Routings indicate 41.4' of 24" DIA CMP. Please reconcile. (Rev. 1) Addressed. 10. C7.0 pipe storage 1-pipe storage 2 profile: revise 12.86' of 15 RCP @ 0.00% to 0.50% minimum. Ref. Alb. county review checklist. (third item, p. -2: hqp:// www.albemarle.ory-/upload/images /forms center /departments /Community Development/forms /Engineering and _WPO Forms / Engineering Review_ Drainage Plans_ Checklist_1Dec2014.pdf ) (Rev. 1) Addressed. 11. C7.0 -Pipe storage ]-pipe storage 2 profile indicates 0.00% slope. Routing indicates 0.0203 %. Reconcile. 12. Recommend 0.5% slope (0.005'/'), Min., for detention systems. (Rev. 1) Addressed. Ase follow-up, since bottom elevations of systems vary, please label profile view system floor elev. relative to entry /exit points. For example, if system #2 is flat along E -W portions to prevent ponding in dead ends, since 0.5% X 60.0' =0.3', it appears that bottom elev. of the N -end of the 60' L, N -S main section (profile STR224- STR212 /system #2) would be 464.3'. Likewise, system #1 bottom elevation near point str. #105 enters the system is 27'± X0.005, or 0.135'± higher than 451.50' (INV out/Str. #103), or 451.64'±. Care should betaken in labeling profile elevations. For example, spatial relationships shown in STR112- STR106 profile do not exist. Str. #105 enters near midpoint, not at the end of 68' L, 96" DIA pipe. Please consider dashed lines (profile views) to indicate pipes continue beyond solid lines that show 96" DIA pipes ending in certain profile views. Plan views show spatial relationship. Recommend no slope for system #2 E -W (35', 65') sections - labels could help clarify. (Rev. 2) Addressed. 13. Label detention/storage system line length in profile, for clarity. (Rev. 1) Addressed. 14. Label detention/storage individual line lengths, C5.0, for clarity. (Rev. 1) Addressed. 15. C7.0 -Str. 201 Ex. 1 profile shows 80.91' of 15" RCP @ 1.06 %. Routing shows primary outlet device of storage system #2 shows 20 LF of CMP @ 1.7 %. Reconcile. (Rev. 1) NA, with redesign, but as follow -up, Engineering Review Comments Page 3 of 4 please confirm routing system #1 (Vol #1) INV = 451.50', system #2 (Vol #1) INV = 464.00'. Also, item #12, above. Revise routings as necessary. (Rev. 2) Addressed. 16. C1.2 /C1.0 - Correlate Site Land Cover Summary, 0.80 Ac. FOREST with Preserved Woods and Open Space Exhibit. Unclear if (exhibit) preserved woods /open space exactly matches 0.80 Ac. spreadsheet value. A label would be helpful since correlation is difficult. Also, 0.80 Ac. value affects water quality 2.89 lb /yr phosphorus load reduction. This acreage must be conserved. Provide preservation/conservation easements for 0.80 Ac. on sheet C1.0. (Rev. 1) Addressed. Per discussion w/ C. Kotarski, 14 -Oct, Final Plat to show and record conservation easements. 17. Indicate and label preserved woods on L1.0. List acreage consistent with VaRRM.xls (0.80 Ac). (Rev. 1) Addressed. Ref. sheet C0.0. 18. C4.0 -With request to 96' cul -de -sac, storage system at Int. Road AB appears problematic. VDOT comment on facilities within public RW is relevant. VDOT may prohibit SWM facilities within RW. Also, schematic (plat) plan view shows all three stormwater storage systems virtually touching sidewalks. Increase distance to grade -level improvements if possible. Provide Private Drainage Easements on Lots 9 and 19 based on trench side -slope required to excavate or replace storage systems in the future. (Rev. 1) Addressed. 19. Remove sheets: C1.1, C1.2, C1.3 (or delete all except Typ. F &C + Typ. Storm Sewer MH Detail), C7.1, C7.2, and L1.1. (Rev. 1) Addressed. 20. Provide TYP. Storm Sewer MH Detail. (Rev. 1) Addressed. 21. Provide documentation of purchase of nutrient credits: (Rev. 1) Applicant response, 10 -Sep letter: "Documentation of nutrient credit purchase will be provided before final approval." E. Documentation of the applicant's acquisition of nutrient credits shall be provided to the VSM? authority and the Department in a certification from the credit provider documenting the number of phosphorus nutrient credits acquired and the associated ratio of nitrogen nutrient credits at the credit - generating entity. Until the effective date of regulations establishing application fees in accordance with § 62.1- 44.19:20, the credit provider shall pay the Department a water quality enhancement fee equal to six percent of the amount paid by the applicant for the credits. Such fee shall be deposited into the Virginia Stormwater Management Fund . established by § 62.1 - 94.15:29. 22. New: Provide debris rack/cage TYP. detail for weir plate orifices, sheet C6.1 (Max. opening: 52 "). Note: with future projects, please ensure control orifice 3" Min. DIA. Current design, detention system 1 orifice =2.5" (9/11 design: 3 "). We defer to Timmons design judgment in this instance as partial offset to cul -de- sac design effort. In the future (other projects), please ensure orifice control design meets 3" Min. DIA. C. VSMP: SWPPP: Erosion Control Plan (WP0201500038) Virginia Code §62.1- 44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is approved. 1. Revise top of dam elevation, ST #3. (Rev. 1) Addressed. 2. Phase 1 ESC Plan, C3.2 shows installation of perimeter controls and traps, but not rough grading while phase 2 appears controlled with SF only. Although sequence makes clear that rough grading occurs with phase 1, please show rough grade (contours) upslope of diversion dikes /traps on C3.2. (Rev. 1) Addressed. 3. Revise sequence of installation, phase 1, note 1: Pre - construction to take place at county office building. (Rev. 1) Addressed. 4. C3.0 - Provide Paved Wash Rack detail -ref. ACDSM. /pg. -8. (Rev. 1) Addressed. 5. Transfer /copy bottom trap dimensions from design tables, C3.1 to C3.2, to aid construction and inspection. (Rev. 1) Partially addressed -as follow -up, please label sediment trap L x W dimensions in plan view. (Rev. 2) Addressed. 6. Show soil stockpile location, if any. (Rev. 1) Addressed. Process: Engineering Review Comments Page 4 of 4 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 request a pre - construction conference by completing a 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; htlp://www.albemarle.orgJdeptforms.asp?dgpartment=cdengno Thank you - 434.296 -5832 —x3069 WP0201500038— Dunlora V— VSMP- 113015rev2Approv- conditional— nutrient +consery pF A vt�r�1Q COUNTY 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: Dunlora V —VSMP Plat /Plan preparer: Craig Kotarski, Timmons Group 919 21 St. SE, Charlottesville, VA 22902 craic.kotarski(a),timmons.com Owner: Valerie M. Shepherd, 26 Clifton Terrace, Weehawken, NJ 07086 Applicant: Milestone Partners, 300 2 °a St. NE, Charlottesville, VA 22920 li(a-)milestonepartners. com Plan received date: 22 Jun 2015 / ee plans (Rev. 1): 11 Sep 2015 / ee plans Date of comments: 11 Aug 2015 / e- review (Rev. 1): 15 Oct 2015 / e- review Reviewer: John Anderson 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. Comments reference binder dated 22 -Jun 2015 — Recommend do not re- submit SWPPP until ESC /SWM plan comments addressed. SWPPP contains reduced -size ESC and SWM plans. — Comments 1 -9 will be addressed with uture revis 1. Sec. 1, Registration Statement — please sign/date. 2. Sec. 4,5 — Revise per comments (recommend wait until ESCP /SWMP comments addressed) 3. Sec. 6 — Revise plan (11" x 17" PPP Exhibit) to show activities listed in Sec. 6.c. Indicate initial locations / locations may change as project progresses or responsibilities delegated to others. Note: PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. 4. Sec. 6.c. — Confirm that `No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. 5. Sec. 6.c. — Identify `Existing basketball court to the north.' (carry -over from Henley M.S. ?) 6. Sec. 6.g. —Sec. explains pollution prevention awareness training shall be provided; two sentences in this section require specific, detailed, pollution prevention awareness training: frequency, how often, content/form of training, etc. 7. Sec. 7 — Discharge to impaired waters requires enhanced inspection frequency -VAR10 Part I.13.4.d.(L). Include statement to this effect — increased inspection frequency. 8. Sec. 9 — Signed Certification: sign/date. 9. Sec. 12 — Inspection Logs — inspection required at higher than 1 x week frequency; recommend logs make this explicitly clear. B. VSMP: SWPPP: Stormwater Management Plan (WP0201500038) VSMP Regulation 9VAC25- 870 -108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved for reasons provided in comments below. The stormwater management plan content requirements can be found in County Code section 17 -403 Engineering Review Comments Page 2 of 4 1. Str. 206 appears to be a MH (C5.1) with 15" DIA pipe upstream, 24" DIA pipe downstream (pipe storage I -pipe storage 2 profile; C7.0), but weir plate in Str. 206 detail (C6.1) shows weir plate within 72" storage system #1. Coordinate design across plan sheets. Note: other weir plates are within storage systems. 2. C6.1 -All weir plates: Although details are NTS, approximate scale is helpful. Recommend adjust NTS 10" orifice to closely approximate 10 ", relative to 6' pipe. Adjust leader line arrow to point to top of weir plate in Str. 104 detail. 3. C6.1 - Revise `top of 4'/6' weir plate' labels for consistency; `top of 6' weir plate' appears accurate. 4. C6.1 - Please add storage system numbers (1, 2, or 3) to each weir plate detail. Comments 1. - 4. Discussed with C. Kotarski, 14 -Oct, in outline form, anticipate profile /detail revisions. As follow-up, please show weir plate (details) as 96" DIA/circular, not rectangular. Label DIA. Also, if top of weirs is not horizontal but coincides with top of 96" pipes, evaluate routings. Revise routings as necessary. Note: From routings: storage system #1 - please compare with detail. Revise C6.1 details + routings, as necessary (for example, if weir plate section #1 is shown circular /accurate, ensure this shape /dimension is modeled accurately in routings.) #4 Device 1 458.00' 4.0' long Sharp - Crested Rectangular Weir 2 End Contractions) 0.6' Crest Height From routings: storage system #2 - please compare with detail. Revise C6.1 details + routings, as necessary (for example, if weir plate section #2 is shown circular /accurate, ensure this shape /dimension is modeled accurately in routings.) #4 Device 1 470.59' 4.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s) 1.1' Crest Height 5. C5.0 -Label storage system #3 pipe outfall Str. number (unlabeled). (Rev. 1) NA - system 43 removed. 6. C5.0 - Storage System #1 L =102 LF, but routings list L as 111 LF - reconcile. Provide notes /labels if system connections account for difference. (Rev. 1) NA - Storage system configuration revised. 7. C5.0 - Storage System #2 L =275 LF, but routings list L as 300 LF - reconcile. Provide notes /labels if system connections account for difference. (Rev. 1) NA - Storage system configuration revised. 8. C6.1 -Weir plate in Str. 104 detail shows 0.2' weir crest height. Routings list 0.6' weir crest height. Please reconcile. (Rev. 1) NA - Storage system configuration revised. Also, see comments 1. - 4. Note, above. 9. C7.0 -Pipe storage ]-pipe storage 2 profile indicates primary outlet device, storage system #1 is 12.86' of 15" DIA RCP. Routings indicate 41.4' of 24" DIA CMP. Please reconcile. (Rev. 1) Addressed. 10. C7.0 pipe storage ]-pipe storage 2 profile: revise 12.86' of 15 RCP @ 0.00% to 0.50% minimum. Ref. Alb. county review checklist. (third item, p. -2: http:// www.albemarle.org /upload/images /forms_ center / departments /CommunityDevelopment/forms/Engineering and _WPO_Forms /En Forms/Engineering Review_ Drainage Plans_ Checklist_1Dec2014.pdf ) (Rev. 1) Addressed. 11. C7.0 -Pipe storage 1 pipe storage 2 profile indicates 0.00% slope. Routing indicates 0.0203 %. Reconcile. 12. Recommend 0.5% slope (0.005'/'), Min., for detention systems. (Rev. 1) Addressed. As follow -up, since bottom elevations of systems vary, please label profile view system floor elev. relative to entry/exit points. For example, if system #2 is flat along E -W portions to prevent ponding in dead ends, since 0.5% X 60.0' =0.3', it appears that bottom elev. of the N -end of the 60' L, N -S main section (profile STR224- STR212 /system #2) would be 464.3'. Likewise, system #1 bottom elevation near point str. #105 enters the system is 27'± X0.005, or 0.135'+ higher than 451.50' (INV out /Str. #103), or 451.64'±. Care should betaken in labeling profile elevations. For example, spatial relationships shown in STR112- STR106 profile do not exist. Str. #105 enters near midpoint, not at the end of 68' L, 96" DIA pipe. Please consider dashed lines (profile views) to indicate pipes continue beyond solid lines that show 96" DIA pipes ending in certain profile views. Plan views show spatial relationship. Recommend no slope for system #2 E -W (35', 65') sections - labels could help clarify. 13. Label detention/storage system line length in profile, for clarity. (Rev. 1) Addressed. 14. Label detention/storage individual line lengths, C5.0, for clarity. (Rev. 1) Addressed. 15. C7.0 -Str. 201 Ex. 1 profile shows 80.91' of 15" RCP @ 1.06 %. Routing shows primary outlet device of storage system #2 shows 20 LF of CMP @ 1.7 %. Reconcile. (Rev. 1) NA, with redesign, but asfollow -up, Engineering Review Comments Page 3 of 4 please confirm routing system #1 (Vol #1) MV = 451.50', system #2 (Vol #1) INV = 464.00'. Also, item #12, above. Revise routings as necessary. 16. C1.2 /C1.0 - Correlate Site Land Cover Summary, 0.80 Ac. FOREST with Preserved Woods and Open Space Exhibit. Unclear if (exhibit) preserved woods /open space exactly matches 0.80 Ac. spreadsheet value. A label would be helpful since correlation is difficult. Also, 0.80 Ac. value affects water quality 2.89 lb /yr phosphorus load reduction. This acreage must be conserved. Provide preservation/conservation easements for 0.80 Ac. on sheet C1.0. (Rev. 1) Addressed. Per discussion w/ C. Kotarski, 14 -Oct, Final Plat to show and record conservation easements. 17. Indicate and label preserved woods on L1.0. List acreage consistent with VaRRM.XIS (0.80 Ac). (Rev. 1) Addressed. Ref. sheet C0.0. 18. C4.0 -With request to 96' cul -de -sac, storage system at Int. Road AB appears problematic. VDOT comment on facilities within public RW is relevant. VDOT may prohibit SWM facilities within RW. Also, schematic (plat) plan view shows all three stormwater storage systems virtually touching sidewalks. Increase distance to grade -level improvements if possible. Provide Private Drainage Easements on Lots 9 and 19 based on trench side -slope required to excavate or replace storage systems in the future. (Rev. 1) Addressed. 19. Remove sheets: C1.1, C1.2, C1.3 (or delete all except Typ. F &C + Typ. Storm Sewer MH Detail), C7.1, C7.2, and L1.1. (Rev. 1) Addressed. 20. Provide TYP. Storm Sewer MH Detail. (Rev. 1) Addressed. 21. Provide documentation of purchase of nutrient credits: (Rev. 1) Applicant response, 10 -Sep letter: "Documentation of nutrient credit purchase will be provided before final approval." E. Documentation of the applicant's acquisition of nutrient credits shall be provided to the VSMP authority and the Department in a certification from the credit provider documenting the number of phosphorus nutrient credits acquired and the associated ratio of nitrogen nutrient credits at the credit - generating entity. Until the effective date of regulations establishing application fees in accordance with § 62.1- 44.19:20, the credit provider shall pay the Department a water quality enhancement fee equal to six percent of the amount paid by the applicant for the credits. Such fee shall be deposited into the Virginia Stormwater Management Fund established by § 62.1 - 44.15:29. C. VSMP: SWPPP: Erosion Control Plan (WPO201500038) -A single comment remains Virginia Code §62.1- 44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved for reasons provided in comments below. The erosion control plan content requirements can be found in County Code section 17 -402. 1. Revise top of dam elevation, ST #3. (Rev. 1) Addressed. 2. Phase 1 ESC Plan, C3.2 shows installation of perimeter controls and traps, but not rough grading while phase 2 appears controlled with SF only. Although sequence makes clear that rough grading occurs with phase 1, please show rough grade (contours) upslope of diversion dikes /traps on C3.2. (Rev. 1) Addressed. 3. Revise sequence of installation, phase 1, note 1: Pre - construction to take place at county office building. (Rev. 1) Addressed. 4. C3.0 - Provide Paved Wash Rack detail -ref. ACDSM. /pg. -8. (Rev. 1) Addressed. 5. Transfer /copy bottom trap dimensions from design tables, C3.1 to C3.2, to aid construction and inspection. (Rev. 1) Partially addressed -as follow -up, please label sediment trap L X W dimensions in plan view. 6. Show soil stockpile location, if any. (Rev. 1) Addressed. 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 Engineering Review Comments Page 4 of 4 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 request a pre - construction conference by completing a 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; htW://www.albemarle.orgJdeptfonns.asp?department=cdengno Thank you - 434.296 -5832 —x3069 WP0201500038_Dunlora V_VSMP_101515rev1 pF A vt�r�1Q COUNTY 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: Dunlora V —VSMP Plat /Plan preparer: Craig Kotarski, Timmons Group 919 21 St. SE, Charlottesville, VA 22902 craic.kotarski(a),timmons.com Owner: Valerie M. Shepherd, 26 Clifton Terrace, Weehawken, NJ 07086 Applicant: Milestone Partners, 300 2 °a St. NE, Charlottesville, VA 22920 li(iDmilestonepartners. com Plan received date: 22 Jun 2015 / ee plans Date of comments: 11 Aug 2015 / e- review Reviewer: John Anderson 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. Comments reference binder dated 22 -Jun 2015 — Recommend do not re- submit SWPPP until ESC /SWM plan comments addressed. SWPPP contains reduced -size ESC and SWM plans. 1. Sec. 1, Registration Statement — please sign/date. 2. Sec. 4,5 — Revise per comments (recommend wait until ESCP /SWMP comments addressed) 3. Sec. 6 — Revise plan (11" x 17" PPP Exhibit) to show activities listed in Sec. 6.c. Indicate initial locations / locations may change as project progresses or responsibilities delegated to others. Note: PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. 4. Sec. 6.c. — Confirm that `No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. 5. Sec. 6.c. — Identify `Existing basketball court to the north.' (carry -over from Henley M.S. ?) 6. Sec. 6.g. —Sec. explains pollution prevention awareness training shall be provided; two sentences in this section require specific, detailed, pollution prevention awareness training: frequency, how often, content/form of training, etc. 7. Sec. 7 — Discharge to impaired waters requires enhanced inspection frequency -VAR10 Part I.13.4.d.(L). Include statement to this effect — increased inspection frequency. 8. Sec. 9 — Signed Certification: sign/date. 9. Sec. 12 — Inspection Logs — inspection required at higher than 1 x week frequency; recommend logs make this explicitly clear. B. VSMP: SWPPP: Stormwater Management Plan (WP0201500038) VSMP Regulation 9VAC25- 870 -108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved for reasons provided in comments below. The stormwater management plan content requirements can be found in County Code section 17 -403 1. Str. 206 appears to be a MH (C5.1) with 15" DIA pipe upstream, 24" DIA pipe downstream (pipe storage I —pipe storage 2 profile; C7.0), but weir plate in Str. 206 detail (C6.1) shows weir plate within 72" storage system #1. Coordinate design across plan sheets. Note: other weir plates are within storage systems. Engineering Review Comments Page 2 of 4 2. C6.1 -All weir plates: Although details are NTS, approximate scale is helpful. Recommend adjust NTS 10" orifice to closely approximate 10 ", relative to 6' pipe. Adjust leader line arrow to point to top of weir plate in Str. 104 detail. 3. C6.1 - Revise `top of 4'/6' weir plate' labels for consistency; `top of 6' weir plate' appears accurate. 4. C6.1 - Please add storage system numbers (1, 2, or 3) to each weir plate detail. 5. C5.0 -Label storage system #3 pipe outfall Str. number (unlabeled). 6. C5.0 - Storage System #1 L =102 LF, but routings list L as 111 LF - reconcile. Provide notes /labels if system connections account for difference. 7. C5.0 - Storage System #2 L =275 LF, but routings list L as 300 LF - reconcile. Provide notes /labels if system connections account for difference. 8. C6.1 -Weir plate in Str. 104 detail shows 0.2' weir crest height. Routings list 0.6' weir crest height. Please reconcile. 9. C7.0 Pipe storage 1 pipe storage 2 profile indicates primary outlet device, storage system #1 is 12.86' of 15" DIA RCP. Routings indicate 41.4' of 24" DIA CMP. Please reconcile. 10. C7.0 pipe storage 1-pipe storage 2 profile: revise 12.86' of 15 RCP @ 0.00% to 0.50% minimum. Ref. Alb. county review checklist. (third item, p. -2: h!tp://www.albemarle.orgLupload/images/fon-ns center /departments /Community Development/forms/Engineering and _WPO_Forms /En in¢ eeringlReview_Drainage Plans_ Checklist_1Dec2014.pdf ) 11. C7.0 Pipe storage 1-pipe storage 2 profile indicates 0.00% slope. Routing indicates 0.0203 %. Reconcile. 12. Recommend 0.5% slope (0.005'1'), Min., for detention systems. 13. Label detention/storage system line length in profile, for clarity. 14. Label detention/storage individual line lengths, C5.0, for clarity. 15. C7.0 -Str. 201 Ex. I profile shows 80.91' of 15" RCP @ 1.06 %. Routing shows primary outlet device of storage system #2 shows 20 LF of CMP @ 1.7 %. Reconcile. 16. C1.2 /C1.0 - Correlate Site Land Cover Summary, 0.80 Ac. FOREST with Preserved Woods and Open Space Exhibit. Unclear if (exhibit) preserved woods /open space exactly matches 0.80 Ac. spreadsheet value. A label would be helpful since correlation is difficult. Also, 0.80 Ac. value affects water quality 2.89 lb /yr phosphorus load reduction. This acreage must be conserved. Provide preservation/conservation easements for 0.80 Ac. on sheet C 1.0. 17. Indicate and label preserved woods on L1.0. List acreage consistent with VaRRM.xls (0.80 Ac). 18. C4.0 -With request to 96' cul -de -sac, storage system at Int. Road AB appears problematic. VDOT comment on facilities within public RW is relevant. VDOT may prohibit SWM facilities within RW. Also, schematic (plat) plan view shows all three stormwater storage systems virtually touching sidewalks. Increase distance to grade -level improvements if possible. Provide Private Drainage Easements on Lots 9 and 19 based on trench side -slope required to excavate or replace storage systems in the future. 19. Remove sheets: C1.1, C1.2, C1.3 (or delete all except Typ. F &C + Typ. Storm Sewer MH Detail), C7.1, C7.2, and L1.1. 20. Provide TYP. Storm Sewer MH Detail. 21. Provide documentation of purchase of nutrient credits: E. Documentation of the applicant's acquisition of nutrient credits shall be provided to the VSMP authority and the Department in a certification from the credit provider documenting the number of phosphorus nutrient credits acquired and the associated ratio of nitrogen nutrient credits at the credit - generating entity. Until the effective date of regulations establishing application fees in accordance with § 62.1- 44.19:20, the credit provider shall pay the Department a water quality enhancement fee equal to six percent of the amount paid by the applicant for the credits. Such fee shall be deposited into the Virginia Stormwater Management Fund established by § 62.1 - 44.15:29. C. VSMP: SWPPP: Erosion Control Plan (WP0201500038) Virginia Code §62.1- 44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved for reasons provided in comments below. The erosion control plan content requirements can be found in County Code section 17 -402. Engineering Review Comments Page 3 of 4 1. Revise top of dam elevation, ST #3 Sediment Trap design #3 drainage area (acres) ( <3) 0.32 [rapwlumes: inrsrnrsro�rma .� elevation (ft) area (sf) wlume(cy) 464.5 180 467 330 23.6 468 479 15.0 a 468.4 544 7.5 469.4 728 23.6 wns*nnnr,r wet storage: wet storage required Icy) (67 "6A) 21.4 bottom of stone weir (ft) 467.0 wet storage proWed at this elevation (cy) 23.6 "coarse aggregate shall be V DOT 93, #357 of 95 slope of wet storage sides 1 1 weir length (fl) (6K Q4) 2.0 dry storage: bottom of trap elevation (ft) 464.5 dry storage required (cy) (67.6A) 21.4 bottom trap dimensions: 16ti 12' crest of stone weir 468.4 top of dam elewtion (ft) 462.5 dry storage prouded at this elevation (cy) 22.6 top width of dam (ft) 3 Slope of dry storage sides 2,1 top trap dimensions 29'x25' 8 3.13 SEDIMENT TRAP #3 N.8-1. 2. Phase 1 ESC Plan, C3.2 shows installation of perimeter controls and traps, but not rough grading while phase 2 appears controlled with SF only. Although sequence makes clear that rough grading occurs with phase 1, please show rough grade (contours) upslope of diversion dikes /traps on C3.2. 3. Revise sequence of installation, phase 1, note 1: Pre - construction to take place at county office building. 4. C3.0 — Provide Paved Wash Rack detail —ref. ACDSM. /pg. -8 5. Transfer /copy bottom trap dimensions from design tables, C3.1 to C3.2, to aid construction and inspection. 6. Show soil stockpile location, if any. Engineering plan review staff are available from 2 -4 PM on Thursdays, should you require a meeting to discuss this review. Plan review staff are also available at 434 - 296 -5832 (- x3069) should you have questions. 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. Engineering Review Comments Page 4 of 4 After DEQ coverage is issued, via the coverage letter, the County can hold a pre - construction conference. Applicants will need to request a pre - construction conference by completing a 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; http:// www.albemarle.org/deptforms.asp ?department= cdengwpo Thank you - 434.296 -5832 —0069 WP0201500038_Dunlora V_VSMP- 081115 .�tlES TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. September 10, 2015 County of Albemarle John Anderson Community Development 401 McIntire Road, Room 227 Charlottesville, Va. 22902 RE: Dunlora V — VSMP Dear Mr. Anderson: We have reviewed all of your comments from August I It', 2015 and made the necessary revisions. Please find our responses to the comments below in bold lettering. 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. (Comments reference binder dated 22 -Jun 2015 — Recommended do not re- submit SWPPP until ESC /SWM plan comments addressed. SWPPP contains reduced -size ESC and SWM plans.) 1. Sec. 1, Registration Statement — please sign /date. 2. Sec. 4,5 — Revise per comments (recommend wait until ESCP /SWMP comments addressed) 3. Sec. 6 — Revise plan (I I " x 17" PPP Exhibit) to show activities listed in Sec. 6.c. Indicate initial locations /locations may change as project progresses or responsibilities delegated to others. Note: PPP Exhibit does not have to be identical with ESCP, but ESC inspectors express preference for PPP elements on ESC plans. 4. Sec. 6.c. — Confirm that 'No concrete washout shall occur on site.' Explain enforcement of this provision. Explain, for example, means of ensuring concrete trucks vacate site without washout. S. Sec. 6.c. —Identify `Existing basketball court to the north.' (carry-over from Henley M.S. ?) 6. Sec. 6.g. — Sec. explains pollution prevention awareness training shall be provided; two sentences in this section require specific, detailed, pollution prevention awareness training: frequency, how often, content /form of training, etc. R: \103 \36167 - Dunlora_ Subdivision \Dots \2 - Design \Letters \PRELIM PLAT (090415) \Comment Response From Timmons 0 6 C cu r C v E a 0 CD a M N V- M Ir El. N %o Li 01 N E 0 M C 0 E E September 10, 2015 Page 2 of 5 7. Sec. 7 —Discharge to impaired waters requires enhanced inspection frequency —VAR 10 Part I.B.4.d.(I ). Include statement to this effect — increased inspection frequency. 8. Sec. 9 — Signed Certification: sign /date. 9. Sec. 12 — Inspection Logs — inspection required at higher than I x week frequency; recommended logs make this explicitly clear. Response to comments 1 -9: As advised, we will submit a revised SWPP plan as we near plan approval. B. VSMP: SWPPP: Stormwater Management Plan (WPO201500038) VSMP Regulation 9VAC25- 870 -108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved for reasons provided in comments below. The stormwater management plan content requirements can be found in County Code section 17 -403. 1. Str. 206 appears to be a MH (C5.1) with 15" DIA pipe upstream, 24" DIA pipe downstream (pipe storage I — pipe storage 2 profile; C7.0), but weir plate in Str. 206 detail (C6.1) shows weir plate within 72" storage system # 1. Coordinate design across plan sheets. Note: other weir plates are within storage systems. Storage systems and weir plate details have been revised. 2. C6.1 — All weir plates: Although details are NTS, approximate scale is helpful. Recommend adjust NTS 10" orifice to closely approximate 10 ", relative to 6' pipe. Adjust leader line arrow to point to top of weir plate in Str. 104 detail. The weir plate details are still not to scale but they have been revised to accurately reflect the design as shown in the attached calculation booklets. 3. C6.1 — Revise `top of 4'/6' labels for consistency; 'top of 6' weir plate' appears accurate. Revised. 4. C6.1 — Please add storage system numbers (1, 2, or 3) to each weir plate detail. Corresponding storage system numbers have been added to the weir plate details. S. C5.0 — Label storage system #3 pipe outfall Str. Number (unlabeled). 6. C5.0 — Storage System # I L = 102 LF, but routings list L as I I I LF — reconcile. Provide notes /labels if system connections account for difference. 7. C5.0 — Storage System #2 L = 275 LF, but routings list L as 30OLF — reconcile. Provide notes /labels if system connections account for difference. R: \103 \36167- Dunlora_ Subdivision \Docs \2 - Design \Letters \PRELIM PLAT (090415) \Comment Response From Timmons September 10, 2015 Page 3 of 5 8. C6.1 - Weir plate in Str. 104 detail shows 0.2' weir crest height. Routings list 0.6' weir crest height. Please reconcile. 9. C7.0 - Pipe storage I -pipe storage 2 profile indicates primary outlet device, storage system # I is 12.86' of 15" DIA RCP. Routings indicate 41.4' of 24" DIA CMP. Please reconcile. 10. C7.0 - pipe storage I -pipe storage 2 profile: revise 12.86' of 15 RCP @0.00% to 0.50% minimum. Ref. Alb. County review checklist. (third item, p. 2) 11. C7.0 - Pipe storage I -pipe storage 2 profile indicates 0.00% slope. Routing indicates 0.0203 %. Reconcile. Response to comments 5 -1 1: The storage facilities have been redesigned and have been consolidated from 3 separate systems to 2. The profiles, plan view, and calculation book has been revised. Dimensions and specifications referred to in various locations now match. 12. Recommend 0.5% slope (0.005'/'), Min., for detention systems. The storage systems as shown on the storm sewer profiles specify a 0.5% slope. 13. Label detention /storage system line length in profile, for clarity. Storage system line lengths have been added to the storm sewer profiles. 14. Label detention /storage individual line lengths, C5.0, for clarity. Individual line lengths have been added to sheet C5.0 for system 2. S. C7.0 - Str. 201 - Ex. I profile shows 80.91' of 15" RCP @ 1.06 %. Routing shows primary outlet device of storage system #2 shows 20 LF of CMP @ 1.7 %. Reconcile. Storage facilities and accompanying calculations have been revised. 16. C 1.2 /C 1.0 - Correlate Site Land Cover Summary, 0.80 Ac. Forest with Preserved Woods and Open Space Exhibit. Unclear if (exhibit) preserved woods /open space exactly matches 0.80 Ac. Spreadsheet value. A label would be helpful since correlation is difficult. Also, 0.80 Ac. Value affects water quality 2.89 lb/year phosphorus load reduction. This acreage must be conserved. Provide preservation /conservation easements for 0.80 Ac. On Sheet C1.0. A preserved woods and open space exhibit has been added to sheet C0.0 and includes area callouts for each section of preserved woods. RAI03\ 36167- Dunlora_$ubdivision \Docs \2- Design \Letters \PRELIM PLAT (090415) \Comment Response From Timmons September 10, 2015 Page 4 of 5 17. Indicate and label preserved woods on LI.O. List acreage consistent with VaRRM.xIs. (0.80 Ac). Sheet L 1.0 has been removed per comment 19. Please refer to sheet C0.0 for preserved woods exhibit. 18. C4.0 — With request to 96' cul -de -sac, storage system at Int. Road A/B appears problematic. VDOT comment on facilities within public RW is relevant. VDOT may prohibit SWM facilities within RW. Also, schematic (plat) plan view shows all three stormwater storage systems virtually touching sidewalks. Increase distance to grade -level improvements if possible. Provide Private Drainage Easements on Lots 9 and 19 based on trench side -slope required to excavate or replace storage systems in the future. The unpaved island has been removed from the cul -de -sac, and it now has a radius of 30'. The revised storage systems no longer encroach into this area or into VDOT right -of -way. 19. Remove Sheets: C 1. 1, C 1.2, C 1.3 (or delete all except Typ. F &C + Typ. Storm Sewer MH Detail), C7.1, C7.2, and L 1.1. Sheets removed. 20. Provide TYP. Storm Sewer MH Detail. A VDOT detail for manhole type MH- I has been added to sheet C 1.1. 21. Provide documentation of purchase of nutrient credits. Documentation of nutrient credit purchase will be provided before final approval. C. VSMP: SWPPP: Erosion Control Plan ()MPO201500038) 1. Revise top of dam elevation, ST #3 ST #3 dam elevation has been revised. 2. Phase I ESC Plan, C3.2 shows installation of perimeter controls and traps, but not rough grading while phase 2 appears controlled with SF only. Although sequence makes clear that rough grading occurs with phase 1, please show rough grade (contours) upslope of diversion dikes /traps on C3.2. Phase "IA," sheet C3.1, has been added to the plan which includes intermediate grading. RAI03\ 36167- Dunlora_$ubdivision \Docs \2- Design \Letters \PRELIM PLAT (090415) \Comment Response From Timmons September 10, 2015 Page 5 of 5 3. Revise sequence of installation, phase 1, note 1: Pre - construction to take place at county office building. The sequence note has been revised. 4. C3.0 — Provide Paved Wash Rack detail - ref. ACDSM. /pg. -8 A Paved Wash Rack Detail has been added to the plan. S. Transfer /copy bottom trap dimensions from design tables, C3.1 to C3.2, to aid construction and inspection. The trap bottom elevation as shown on the design table has been added to plan view. 6. Show soil stockpile location, if any. A soil stockpile location has been specified. We have electronically submitted the plans and calculations for your review. If you have any questions or comments, please feel free to give me a call at 434.327.1 688. 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