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HomeMy WebLinkAboutWPO201300058 Correspondence 2013-08-20 I°Iwi Dominion 172 South Pantops Drive °'g � ► Engineering Charlottesville, VA 22911 6-4 0: .101111 434.979.8121 (p) a�0*' 411. ,I 434.979.1681 (f) 4),),•eps DominionEng.com s January 15, 2014 Ms. Michelle Roberge Albemarle County Department of Community Development 401 McIntire Road Charlottesville, Virginia 22902 RE: WPO 2013-00058-Hollymead Town Center Block C4— WPO Plan Dear Michelle, Enclosed for approval please find four(4) sets of Final Site Plan-WPO Plan for the referenced project. Please note that we have revised the plans to address your comments dated January 13, 2014 in accordance with the following: ENGINEERING COMMENTS ON WPO PLAN: Erosion & Sediment Control: Adequate (Code Chapter 17,Article II) X Not Adequate Y N X State standards followed,and Design Standards Manual notes and details X Adequate limits and perimeter measures out of work areas X All stages protected adequately X Adequate channels X -Show inlet protection for structure 1A -Connect RWD with diversion dike(located east). E+S RESPONSES: • Inlet protection has been provided for Structure 1A. • The RWD has been connected to the diversion dike to the east. SWM COMMENTS ON WPO PLAN: Page 1 of 2 Cm 9 Oa�4.4.410 Dominion 172 South Pantops Drive 07 � ■ Engineering Charlottesville, VA 22911 a 1, 434.979.8121 (P) Arlf,,Op 434.979.1681 (f) Oeps DominionEng.com s Stormwater Management: Adequate (Code Chapter 17,Article III) X Not Adequate Y N X Enough capture and treatment for on-site areas(using SWM Facility#2) X Enough detention storage for on-site areas(using SWM Facility#2) X Sealed hydrologic and hydraulic computations provided X -I discussed the issue of pipe between structures 62 and 61 with the County Engineer.It appears that even though the HGL works,the built structures were not built to VDOT watertight standards.Therefore,this pipe will still need to be replaced.Please replace with 24'pipe(open channel condition). SWM RESPONSES: • The plans have been updated to show replacement of the 18" pipe with a 24" pipe between structures 61 and 62. The demo plan, storm sewer profiles and computations have been updated accordingly. Please also note that we have removed the HGL computations and the HGL from the profile. We trust the above adequately addresses your comments. Please let me know if you have any questions or require additional information. Very tr/,; yo s, Micha7' ers, P.E., C.F.M. Attac ments Cc: Katurah Roell Page 2 of 2 '.•r 5 e' „vs o`+' j Dominion 172 South Pantops Drive �` g 41 • Engineering Charlottesville, VA 22911 4 , 434.979.8121 (p) coi". � �� v 434.979.1681 (f) 're,•'s s DominionEng.com December 17, 2013 Ms. Michelle Roberge Albemarle County Department of Community Development 401 McIntire Road Charlottesville, Virginia 22902 RE: WPO 2013-00058 Hollymead Town Center Block C4- WPO Plan Dear Michelle, Enclosed please find two (2) sets of Final Site Plan-WPO Plan for the referenced project. Please note that we have revised the plans to address your comments dated November 1, 2013 and as discussed with you during follow-up phone calls in accordance with the following: ENGINEERING COMMENTS ON WPO PLAN: Erosion & Sediment Control: Adequate (Code Chapter 17,Article Il) Not Adequate Y N X State standards followed,and Design Standards Manual notes and details X Adequate limits and perimeter measures out of work areas X All stages protected adequately X Adequate channels X -Diversion dikes(behind lots 18-27)to silt trap still needs to be shown. -Place a note that positive drainage will be maintained near entrance to direct water to silt trap or show a RUM at the entrance. -Also,place a note that the entrance will be built to completion only after positive drainage from the diversion dike to the silt trap is no longer required by the county E&S inspector. -Place a note that states lots 24-28 can be issued a building permit only after the sediment trap is removed and area is stabilized. E+S RESPONSES: • A diversion dike behind lots 18-27 has been added to the plans. Also,the area to ST-1 has been - updated. • A RWD has been added to the entrance. v- • The note has been added. • The note has been added. ,/ Page 1 of 2 s Ce p¶5 J o 4. '1 Dominion 172 South Pantops Drive :114k ► Engineering Charlottesville, VA 22911 4 434.979.8121 (p) ��� � .�/' 434.979.1681 (f) e°s s DominionEng.com Stormwater Management: Adequate (Code Chapter 17,Article III) X Not Adequate • Y N X Enough capture and treatment for on-site areas(using SWM Facility#2) X Enough detention storage for on-site areas(using SWM Facility#2) X Sealed hydrologic and hydraulic computations provided X -Include storm drain profiles with this WPO application. -The sediment trap depth,Dl,is incorrect.Per elevation shown on sheet ES5,DI is 2.2'. -DA on ES6 do not match values on ES7. -For structures 62 and 61,provide as-builts value.It appears the pipe capacity for the 18"pipe is 14 cfs.The as-builts can be found in 2301 HTC Timberwood Boulevard PH1 Road Plans. -Include structure 1A on ES7 comps. -Please note some comments on the site plan regarding driveways may affect WPO plan. SWM RESPONSES: • The storm drain profiles have been added as Sheet 6A. • The sediment trap chart has been updated in accordance with the new drainage area to ST-1. ✓ • The drainage area maps and the storm sewer computations have been rectified so the numbers match. y • We have added HGL computations and a 10-yr HGL to the profiles on Sheet 6A to indicate that the existing pipe system is adequate to convey the design flow within the system. • The computations have been updated to include structure 1A. V • The site plan comments regarding the driveways has been incorporated into the WPO plan. We trust the above adequately addresses your comments. Please let me know if you have any questions or require additional information. Very truly yours I' Micha) yers, P.E., C.F.M. Attachments Cc: Katurah Roell Page 2 of 2 s 'owe' Niue eV 444* Dominion 172 South Pantops Drive to 4 1. Engineering Charlottesville, VA 22911 o%\ , 434.979.8121 (p) •�,o� ( 434.979.1681 (f) 190, ors DominionEng.com e s October 25, 2013 Ms. Michelle Roberge Albemarle County Department of Community Development 401 McIntire Road Charlottesville, Virginia 22902 RE: WPO 2013-00058 Hollymead Town Center Block C4— WPO Plan Dear Michelle, Enclosed please find eight(2) sets of Final Site Plan-WPO Plan for the referenced project. Please note that we have revised the plans to address your comments dated September 11, 2013 in accordance with the following: ENGINEERING COMMENTS ON WPO PLAN: Erosion&Sediment Control: Adequate (Code Chapter 17.Article II) x Not Adequate Y P1 X State standards followed.and Design Standards Manual notes and details • Adequate limits and perimeter erasures out of work areas ▪ All stages protected adequately X Adequate channels X Move silt trap to NW corner away from road entrance. Show construction entrance as 12'x70'. Show silt fence around stockpile area. _ _ See attached image. E+S RESPONSE: As discussed at the engineer's meeting on 9-12-13,we have made the following changes to the plans: • The silt trap has been moved away from the road entrance. • The construction entrance has been revised to 12' x 70'. • Silt fence has been added around the stockpile area. Star mwater Management: Adequate (Code Chapter 17.Article I)I) X Not Adequate Y N X Enough capture and treatment for cm-site areas(using SIAM Facility#2) X Enough detention storage for on-site areas(using SIAM Facility#2) X Sealed hydrologic and hydraulic cmtputagons provided X Show crown,curb and gutter for entire length of road. Raise lots 18-29 so garage is at least 1'above road. Include afl stormsewer ealcs,details&profiles with this IAPO application. Reference the approved application number for items on sheet ES7. Show two DI near die\fit'entrance(See attached image). Page 1 of 2 %ow vase es 4•6A43‘ 4� Dominion 172 South Pantops Drive °' ► Engineering Charlottesville, VA 22911 0. -- , 434.979.8121 (p)Ili o� j 434.979.1681 (f) mP` s DominionEng.com s SWM RESPONSE: As discussed at the engineer's meeting on 9-12-13,we have made the following changes to the plans: • We have provided a 1' ribbon curb to demarcate the edge of pavement on the high side of the road as discussed in lieu of providing a crown section. • We have raised the lots to improve the drainage to the road. • All required storm calculations have been provided on the plan set on Sheet ES7. • The approved application number has been provided on Sheet ES7. • We have flipped DI-2 to the low side of the street near Lot 1 and added a DI-1A near Lot 29 to improve the drainage situation at the NW entrance as discussed. We trust the above adequately addresses your comments. Please let me know if you have any questions or require additional information. Very tru j rs Mich' yers, P.E., C.F.M. Attachments Cc: Katurah Roell Page 2 of 2 Michelle Roberge From: Mike Myers [mmyers @dominioneng.com] Sent: Monday, September 16, 2013 10:39 AM To: Michelle Roberge Subject: FW: Attached scan Attachments: 2325_001.pdf Michelle,See the attached plan that shows how we would need to re-route the sanitary sewer to avoid relocated storm structure 2 and maintain the 10' separation between sanitary and storm. This is not an ideal situation for the sanitary sewer, since the park planting is adversely affected. If we are to leave the design as-is, we would add detailed spot elevations to ensure adequate drainage. Please advise, thanks, Mike From: dedscar adominioneng.com [mailto:dedscan©dominioneng.com] Sent: Monday, September 16, 2013 10:54 AM To: Mike Myers Subject: Attached scan icl,slt I i v I. 41. 4 . � L i � t t. Z 1 '44,1b4 .3 IIC).16) Z.I Y1 \ i SO cn. 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