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Home My WebLink AboutWPO201400097 Correspondence 2015-02-24 Nap, Nome- •• % • TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS February 24, 2015 Michelle Roberge County of Albemarle Dept of Community Development 401 McIntire Rd, Rm 227 Charlottesville,Va. 22902 RE: UVA Physicians Group—Northridge—VSMP- Comment Response Dear Ms. Roberge: We have reviewed all of your comments from January 9th, 2015 and made the necessary revisions. r„ Please find our responses to the comments below in bold lettering. ° N. N • Q CO Stormwater Pollution Prevention Plan (SWPPP) cu� N N M I• o The registration statement has been updated. ? v N W .o �. - p c'Lt6" t•nd v C .' , N The SWPPP has been updated to use the standard Albemarle County template. a E v c o 0 o r E A pollution prevention awareness section has been provided. € 3 http://www.albemarle.org/deptforms.asp?department=cdengwpo •'i. . Acknowledged, signatures shall be obtained upon plan approval cc The SWPPP has been updated to include the impaired waters. t,.6. R:\103\36033-Northridge_Med_Center\Docs\2-Design\Letters \NI Nue' February 25,2015 Page 2 of 4 Acknowledged. B. Pollution Prevention Plan: ----,47. r,cl_.(.1e, an l I"x! 7" plan snowing the fueling stations, portaHorins, solid waste disposal, and concrete wash areasi, This can be marked up by the operator as construction arogresses. Acknowledged. , 1 -,,,,--,. (2...,,, ,:: C. Stormwater Management Plan (SWMP): vi. Revise the "Total Disturbed Acreage" (Site Data tab) from .29 to .46 on the VRRNI, spreadsheet and title sheet of plan. The total disturbed area has been revised. /),,,::4-.) ,. v2. P!ease note the title sheet should not liic'ude "Malor Site Plan Amendment.- Revise to "VSMP Plan.' The cover has been revised to say VSMP plan. 3. In the Cnannei and Flood Protection tab, P-iease change the 24 hr rainfall events to the fol:owirig: Th's will change the CN value to 87 Values have been updated in the Channel Flood protection Tab. --r--- 4. Revise. the CN value to 87 for post development conditions in HydroCAD calcuiations. Adjusted CN value remains 86 and has been used in HydroCAD calculations. 5. For calcJlation in HydroCAD, cnange i yr, 2 -yr, i 3 yr. and i OC yr- 24 hour rainfall to match chart in comment 3. 24 hour rainfall depths have been updated in HydroCAD. 6. On Sneet C6.0 the plan shows 46 acres to oe disturbed, but does rot match total area in '1---, the water quality calculations section. Please revise to match the total .46 acres Limits of disturbance have been updated to 0.74 acres in all locations. /7. Snow a .cifieba,-, Line the forebay to avoid short cut around treatment. See VA DCR Stormwater Design Soecitic.atior No. 9 for sizing Pease note the total surface area required for the blofilter is approximately !60 sf. Level one bioretention does not require a pretreatment cell if a gravel diaphragm is used per Design Specification No. 9. A detail for the Gravel flow spreader has been added to C6.0 showing a liner. v 8. Revise the biofiiti.er:avit. i.: to avoid toe narrowed section. Please note long rectangular shaped basins do not ,Airir: web. Layout has been revised, see Sheet C5.0. V'9. Remove the illteT la,-:.r:-.:. Delow ::r!e. , 57 sr.3f.,,,, Detail has been revised to remove filter fabric, See Sheet C6.0. 10. ~)lad.-:, :a 2- ci-c4.,:i.!-- s7.-.),,2 r 4 3 ' ' -4.'--ri.C*; wasineo gi-aveii betvvee.ri the ruler f•?..c.:--c and tHe St Detail has been revised to add 2" of pea gravel, See Sheet C6.0. R:\103\36033-Northridge_Med_Center\Docs\2-Design\Letters "goof February 25,2015 Page 3 of 4 II. ?face a hot.a fi.t,f- s: cre 47 scone, 'Rake B" o so A be-at" 1457 sc-iihe Detail has been revised, note has been added, See Sheet C6.0. 12. The grave i fiow so---aaoer 7r) r.;-; far oyes: of the oifpfiter does not aiign weii :he biofiiter and forces concentrated flow to make, a scarp bend :ow' -Js the boiliiticfr revise; The Gravel flow spreader layout has been revised, See Sheet C5.0. vi 3. Show trie griavei fiow spreader detaii with the bloflitex detaii o" C6 tours ih the VA DCR Stormwacer Desgin Soecif,cation No 9. Pease show the 2" gravel diaphragm lip and label the type of score Revise the plan view. Aso, there should be a 2-4" elevation drop from I' cut ,nto the gravel or stone diaphragm. Gravel flow spreader detail has been added, See Sheet C6.0. 14. Si-3'w arbund th 24" rs'vociaht hoer PIace horn, so layer up tip hp'of structicire.” This note has been added to the Biofilter Detail. -45. The plants proposed within the Dic)filter ara a type of s.yvtchgrass. Please see the planting sic.;ecs in VA DC R Stormwater Design Specification No, 9. It appears you will meet the perennial garden iyvich shrubs, Pdt show perennial plantings as we as the burg;indy syvitchgrass. Please note that switch5_,,rass can mature to 2-3 feet wicei it appears about 29 p+ant'S ',/vOud be needed for the ; 79 sf area Piease note this arri,tiii..int change when you hesize toe bioNter per comment. 7. - Acknowledged the landscape plan has been updated. 46. Pease include. the S/VM notes or Design Standards manu Stormwater notes have been included on sheet C6.I. Engineering Comments from Jan 8, 20 1 5: I. State the dare of toco on the srieet, Au topo should be at least visually 1'ieid verified oy designer within the last year oar section 18-32.6.6 The date of the survey has been added to Sheet CO.O. 2. The travelway to the. entrance .appears to be 'better suil:er :or. -e way A:so, ee only imieets our one way travel widtri. P'ease ciarify arc :ape; as one This travel way is one-way. Signage has been provided. 3. The park:ng spaces show spot elevations that appear to be th buttoiin b 23.;2. 627.48, and 626,41 Please ;abet as bottom of curb or snow too or curb eievat,:ohs to cc consistent with par. The intent is for the curb to be flush with the pavement in these areas. FC has been added to all spot elevations where the curb is flush for clarification. 4. f'flece *.S a 598.28 fop air chat aeoe.ars rip aih Piease ceiyise to 629 28. This spot elevation has been updated. 5. 1-liacn a sic..iot &evation r,"e .3v,:;,TA4k mt.: with .eleviaciori 62.8 73. Aise griadri for itie this area. A spot has been added to this area. RA103\36033-Northridge_Med_Center\Doc0-Designletters , -.woe February 25,2015 Page 4 of 4 1 I 6. The cross :s'.:c. s^ s d akin i< at 628 ,. a. shc,,in ;, 2% P'e s: --a -se. The sidewalk is currently graded with a 2%cross slope. However the longitudinal slope of the walk is 1.73%.This is what's causing the contour to appear skewed the way it is. I 4 .',I,tev..4: 2 , ,,; V 7. Please change the star- nse to 7" and not +0 / p These stairs are currently 7 inches. , .�/'` 8. '1 the bldg. ,s 5'.•i: ooerar:on:ai. snow a saki T-=.- .1:e. F;)r ;7r=C;1,s'.t'?r3€ns to bicig when cons` J ..,h in .cegr s. A note has been added to Sheet C4.0 indicating the safe route into the building. We have attached (2)full size copies of the revised plan package for your review. If you have any questions or comments, please feel free to give me a call at 434.327.1688. Sin rely, 1(241L12' Craig Kotarski, P.E., LEED AP Project Manager enc R:\103\36033-Northridge_Med_Center\Docs\2-Design\Letters • • • TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS April 6, 2015 Michelle Roberge County of Albemarle Dept of Community Development 401 McIntire Rd, Rm 227 Charlottesville,Va. 22902 RE: UVA Physicians Group—Northridge—Minor&VSMP Comment Response— SDP201400072 Dear Ms. Roberge: We have reviewed all of your comments from March 26th&27th, 2015 and made the necessary N revisions. Please find our responses to the comments below in bold lettering. a > N M u i- o U v — N sp Spot elevation has been added in the area See Sheet C5.0. cn; N C rrel N I. a` The Limits of Disturbance has been added to Sheet C0.0. E 4. http://www.albemarle.org/deptforms.asp?department=cdengwpo - Signatures have been provided on the Registration Statement and the Delegation of Authority Form. 0 R:\103\36033-Northridge_Med_Center\Docs\2-Design\Letters April 6,2015 Page 2 of 3 B. PPP; I. 77 ci-an s w2 tne Le stat:ons, borc3-- i3,. s. so, d waste ,psa:. and concrete -,,vasni areas. TH., car, be marked up t.../ tne operator as 7_01-'37rt.;Ct!,:_)r-F progresses [Revision I] Comment not addressed. / The PPP has been updated. Two Drawings are now provided. One showing the V existing site with the locations requested shown. The other shows the proposed site with no measures shown. The intent of the second drawing is to allow the operator to mark it up as the site gets built out. C. Stormwater Management Plan (SWMP): I. Revise the "Toni Disturbed Acreage." (Ste Data tab) from .29 to 46 on the '../RR spreadsheet and title sheet of pian. [Revision I] Comment partially addressed. LOD is now .74 acres. Please list on the title sheet under site data. \/ The Limits of Disturbance has been added to Sheet CO.0. 6. On Sheet C6.0 tee pian snows .46 acres to be disturbed, bur does not matcn tota area in the water .c-luaiity caicuialons section Pease revise :o march the total .46 acres. [Revision I] Comment not addressed. The total disturbed acreage is .74 acres. However, 0.26 acres does not need to be included when determining phosphorus removal. This is a temporary laydown area only and it does not appear to add new impervious or revise turf area. You will meet quality requirement with level I, but please revise the Site Data tab to reflect correct info. Feel free to contact me if you have any questions V. 6a) Revise the total disturbed acreage to .43 acres. Also, revise impervious and turf areas. Phosphorus removal is .05lbs/yr. The total disturbed acreage has been updated. 6b) Revise the managed turf area stated in the narrative. It does not match the plans. The narrative has been updated. 6c) Revise the acreage in the water quality section of sheet C6.0 to match above comment (a). The water quality section on Sheet C6.0 has been updated. 6d) On Sheet C6.0, revise I 0 year peak flow for pre and post to match report. The 10 year flows have been updated. 6e) (New Comment) Has the capacity of pipe downstream of biofilter been checked? Please provide analysis for 10 year storm. Analysis for the 10 year storm has been provided for pipe 101. See calculations booklet. 10. Pace a 2"' choke,- sirofie nr #39 ,Nasned ( : c -inc .- sore_ [Revision I] Comment partially addressed. Please remove the fker fabric underneath the pea gravei, The new standards prefer tnis., Also, geotextile fabric should wrap sides of ttiofiiter only. The idea is to allow for more infiltration. The intent of the filter fabric shown is that it will only be a 2'wide strip above the underdrain to keep it from clogging. This appears to match what is shown in the ,BMP Clearing House Specification No.9 Figure 9.4a. A note has been added to the biofilter detail indicating that the fabric is only 2' wide and shall be centered on the underdrain. See Sheet C6.0. R:\I 03\36033-Northridge_Med_Center\Docs\2-Design\Letters April 6,2015 *ow. Page 3 of 3 It 13. Show tno scriacier c:etai: with the tioF'-,e- P:etat! on C5 0 This can be louniti the VA DC R Scorn— Design Specifcat.or N.tp 9, Please so'ni the 2- grave; Piacnragnt. iio ar ace :he t),ce of v:one. Revi3e the par view A15o. there should Pe a 2-4" elevation drop "rom :he curb cut into tre grave. '7.),r store d'achragim. [Revision I] Comment partially addressed. The applicant provided the detail, There was a typo in my previous comment where I stated 2" for the gravel diaphragm width. I meant to say the no 57 stone area should be 2' wide and not 1', This detail has been updated. IS. The plants proposed within the biofilzer are a type of switchgrass. Please see the p,iantirg soecs in VA DCR Stormwater Design Specificatiori No. 9. it appears you will meet tne perennial garden with shrubs, but Show ,oeriennia plantings as well as the burgundy SW'7':hgrass P!ease note that switchgrass can mature to 2-3 feet wide. It appears about 29 plaints would be needed for the ' 79 sf area Pease note this amount may change when you resize the bolter per comment 7. [Revision I] Comment not addressed. The planting plan for a level I is shown below. See planting requirement from section 6.8, Showing switchgrass only, which is considered turtgroundcover, is inadequate. I recommend adding winterberry holly since switchgrass is a warm season grass only Winterberry Hollies were shifted from the perimeter down into the engineered -toils to diversify species.The intent is for the grasses to cover and the Winterberry to rise up above. —r- 17. P!ease include -.he symbol 'or oermanent seeding i'PS) or st'eer. C3,; Snow for cot' areas of c.'.isturbarce. Permanent Seeding in these areas is shown on Sheet C3.2. Temporary seeding in these areas is shown on Sheet C3.I. 18. Show area of .stock.pile and now mucr in ciJloic yard. Snow contours. Aso, snow t-,erimeter control measure. Srow stabilization of 31:7.•.Ckp .-7: cer comment A stockpile area has been shown on Sheets C3.I &3.2. We have attached (2)full size copies of the revised plan package for your review. If you have any questions or comments, please feel free to give me a call at 434.327.1688. Sincerely, — 400 117a1-6=1L—fcc:s Craig Kotarski, P.E., LEED AP Project Manager enc R:\I 03\36033-Northridge_Med_Center\Docs\2-Design\Letters ,� • • •s•�s ......; TIMMONS GROUP rOuR VISION ACHIEVED THki>u,H o+.JRS May 8, 2015 Michelle Roberge County of Albemarle Dept. of Community Development 401 McIntire Rd, Rm 227 Charlottesville,Va. 22902 RE: UVA Physicians Group—Northridge—Minor&VSMP Comment Response— SDP201400072 Dear Ms. Roberge: We have reviewed all of your comments from April 3061, 2015 and made the necessary revisions. N Please find our responses to the comments below in bold lettering. G N 1 9. [New Comment]: Please remove all E&S and all SWM plans from the site plan: v o C3.0, 3.1, 3.2, 6.0 and 6.1. Please note removal of the E&S sheets will impact the 5 m conservation plan. Tree protection from E&S should also be shown on the o X landscaping plan. Discuss with planning. A r All Erosion & Sediment Control and Stormwater Management Sheets have been V removed from the site plan. Tree protection has been shown on Sheets C5.0, N LI.0, and Ll.I. N CM ci N m- 13. - ., 0. l° E oU O O V O C C C O [Revision 2]: There is a typo with "width 2" for Class A' riprap. Please revise. The Class Al dimensions have been updated to match what is shown on the plans. The dimensions now read Width 1=6' and Width 2=6'. See "Gravel Flow Spreader Pre-Treatment Device" detail on Sheet C6.0. We have attached (2)full size copies of the revised plan package for your review. If you have any questions or comments, please feel free to give me a call at 434.327.1688. Si rely, ■ a raig Kota ski, P.E., LEED AP o o o Project Manager ,� R:\I 03\36033-Northridge_Med_Center\Docs\2-Design\Letters