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HomeMy WebLinkAboutSDP200400106 Review Comments Stormwater Management Plan 2005-03-25 , 41, . . . , 1 i , ft A ' V 0 otit , ,...... --1 ,7k,, , il T , 4 ) LA" 1 L3 v _. ,-I.N a • _.,, 4 NI,, - sti 4,' '' f\ , ,4 , % ,. • ,4-1 ' ' 4 . . • Pi' ''• , . .\ ' I ‘4 11 4 1 ‘...:, .s lollik,,.: ,4 0 . .._ .. , .14 il V.)) I - I -4.,k I---... t%.NIII 41, N c- ' ' ''' NINO ."--1"-- , . _ - _ _ _ --.. i - c-- V\ ' OF r 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: Crozet Self Storage Plan preparer: WW Associates,Inc. [fax 582-6179] Owner or rep.: Route 240 LLC/Princess Ann Dev. LLC [no fax given] Plan received date: 24 Mar 2005 Date of comments: 24 Mar 2005 Reviewer: Glenn Brooks A.Final site plan(SDP200400106) 1. All comments have been addressed. B. Stormwater management plan(WPO200500012) 1. All comments have been addressed. Plans are approved subject to a stormwater management facilities maintenance agreement being received and approved for recordation. Please contact Sherry Short if you have questions regarding the process for this agreement. The stormwater management bond amount is$62,000. C.Erosion and sediment control plan(WPO200500012) 1. All comments have been addressed. Please provide four additional copies for distribution at the pre- construction conference. The erosion control bond amount is$18,000. D.Boundary Adjustment and Easement plat(SUB200500041,WPO200500012) 1. All comments have been addressed. The final plans are tentatively approved subject to the stormwater agreement being completed as stated in item B above. Copy:file File:E4_fsp,swm,ecp,fpt_GEB_Cville Self Stor Crozet.doc COUNTY OF ALBEMARLE oVA, Engineering Review Submission Form Department of Community Development 4 401 McIntire Road,Room 227 Charlottesville,Virginia 22902-4596 (434)296-5832 `!Rc1N�P Fax(434)972-4126 - v► c— Project Name: Charlottesville Self Storage at Crozet From(Name or Firm): VVV1l Associates Date: March 22, 2005 (Please separate plans for review by different individuals) X EROSION& SEDIMENT CONTROL PLAN or PLAN AMENDMENT First Submittal Revision Additional copies only -narrative(2 copies) - narrative(2 copies) (usually after approval) -plan(2 copies) - plan(2 copies) -application and fee STREAM BUFFER MITIGATION PLAN First Submittal Revision -plan(2 copies) - plan(2 copies) -application and fee X STORMWATER MANAGEMENTBMP PLAN Conceptual Plan First Submittal Revision -plan(2 copies) - plan(2 copies) -plan(2 copies) -computations;water quality -computations;water quality, -computations as revised (2 copies) hydrology,hydraulics,map(2 copies) (2 copies) -application and fee ROAD PLAN(PUBLIC OR PRIVATE) (all items, 2 copies for private roads,5 copies for public) First Submittal Revision As-built -plan -plan -plans -pavement design sheets -pavement sheets -plats -computations(&maps) -computations FINAL SITE PLAN OR AMENDMENT (First Submittals are to the Development Process Manager) Revision -plans(3 copies,incl.retaining walls if applicable) -computations as revised(2 copies) CERTIFIED ENGINEERS REPORT (addressing each performance criteria of the Zoning Ordinance) First Submission Revision -letter and documentation -plans or sketches CBR REPORTS Public Roads Private Roads -pavement design sheets -pavement design sheets (4 copies) (1 copy) RE C r I v %n TRAFFIC STUDIES Public Roads Private Roads P.r--.4`( 4 ,,L7 (2 copies) (1 copy) COMMUNITY DEVELOPMEN W n''' ENGINEERS SURVEYORS PLANNERS ASSOCIATES TRANSMITTAL To: Glenn Brooks Date: March 22, 2005 Engineering County of Albemarle Project. No.: 204135.01 401 McIntire Road, Room 227 Charlottesville, VA 22902-4596 Project: Charlottesville Self Storage @ Crozet Number Spec. Section/ Description Copies Drawing No. 2 Revised Final Site Plans 2 Revised Plats 1 Revised SWM/ESC Computations 1 Engineering Review Form 1 Previous Mark Ups (3-7-05 plans returned) Glenn—Enclosed are plans and plats addressing your March 10, 2005 comments. We trust these revisions meet with your approval. Should you need clarification or any additional information, please feel free to contact me. Thank You, WW Associates By: Amy K. S p, PE "..Q1"-(1°P). Project Manager COMMUNITYDEVELOPMEN' cc: w/ copies of referenced data w/ copies of referenced data 147 Mill Ridge Road•Lynchburg,Virginia 24502 Telephone(434)582-6175 •Fax(434)582-6179 Lynchburg•Charlottesville County of Albemarle,Virginia CHARLOTTESVILLE SELF STORAGE AT CROZET FINAL SITE PLAN RESPONSES March 21, 2005 = To: Glenn Brooks County of Albemarle- Engineering Department r t� ; 9 ",,,c From: WW Associates COMMUNITY DEVELOPMENT Please find 2 sets of plans with the following responses towards the comments received from the County of Albemarle Engineering Department, dated March 10, 2005. Each comment has been reviewed and a written response given as to how the comment was addressed and where to locate the changes on the plans. Should you have any further questions, please feel free to contact our office. A. Final Site Plan (SDP200400106): 1. Please clarify on the plan how off-site parking, travelways and paving are to be retained, or modified to meet Zoning Ordinance requirements. Travelways and parking spaces are shown being cut. Please show new paving, and revised paint striping, or removal of the old paint [18-4.12.15] Response: The former parking area for the ConAgra site has been noted on the site plan as: "Former parking lot, to be reconstructed or re-striped with any new use of the ConAgra property. 2. Please clarify the rip-rap outlet channel dimensions. Detail B-B, Sheet 13A does not appears to be used on the plans. [18-32.6.6d] Response: Section B-B has been shown as the Emergency Outfall Spillway channel and corresponds with the detail. 3. Please correct the grading so that 5% slope is maintained in the travelways between buildings. Currently up to a 7% cross slope is shown with the spot grades. Please revise the inlet spread computations accordingly. Please use intensity values of 4 in/hr for spread, and grate inlet types as shown on plans. Please ensure spread is below half the travelway width (15'). The current computations indicate spreads over this amount. (Please feel free to send these computations ahead of your submittal so we can agree on them.) [18-4.12.15c, Design Manual section 505G] Response: The building reveal has been modified and spot grades adjusted so that a 5% cross slope is maintained across the travelways. Also, the inlet spread computations have been revised as per WW Associates e-mail Charlottesville Self Storage at Crozet 1 WWA Project#204135.00 Final Site Plan Responses March 21, 2005 County of Albemarle,Virginia correspondence. See Appendix D in the SWM Calculations for results. In addition, sample charts and an inlet drainage area map have been provided for support of the calculations. B. Stormwater Management Plan (WPO 200500012): 1. Physical discrepancies need to be corrected on the basin details. It is recommended that the details for the basin be drawn to scale. The 24"orifice actually cuts into the crest of the riser and doesn't physically work as computed. The 3"pipe on the drawdown device details will not allow a 4" orifice. The low flow pipe doesn't have a length specified, but the fill behind the headwall would appear to cover part of the 24"orifice in the riser. 24" is also a pretty large ct out of a 36"pipe. Aside from these physical glitches, the basin appears to be larger than necessary, which is approvable subject to the physical discrepancies being corrected, and computations adjusted accordingly. Response: The basin detail and the 4"pipe on the drawdown device have been corrected (and drawn to scale). A 3' weir notch has been used as the principal spillway. See Detail. The basin has been designed larger to accommodate some portion of the potential future development of the Route 240 property. 2. A Stormwater Management facilities maintenance agreement must be approved prior to approval of the construction plans. I understand you wish to provide this after the easement plat is recorded. Response: The Stormwater Maintenance agreement will be provided as soon as the plat is approved for recordation because the deed book and page number of this plat must be inserted into the agreement. The signed agreement with the$16 check will be provided when the County approves the plat. C. Erosion and Sediment Control Plan (WPO 200500012): 1. Please provide the basin and trap dimensions (bottom, weir elevations, cleanout elevations, temporary orifices, baffles, collars, etc.) on the plan so that the County staff can properly inspect these facilities. The differences between the permanent structures and the temporary structures should be made clear on details and plans so adequate conversion can be accomplished. Response: Dimensions on the basin and trap are now shown on the E&S plan. Elevations of the trap weir and cleanout elevations are shown on the detail sheet. Notes have also been added for conversion of the sediment trap and basin to Stormwater Management/BioFilter Facilities. Charlottesville Self Storage at Crozet 2 WWA Project#204135.00 Final Site Plan Responses March 21, 2005 County of Albemarle,Virginia 2. Please provide computations for the trap volumes demonstrating they meet the minimum volumes required. Set the weir elevations and dimension accordingly on the plans. Response: A chart showing the wet/dry storage volumes required and provided have been added to the E&S sheet. Weir elevations are also shown. 3. Please provide a computation for the sediment basin dewatering orifice, and revise the plan details accordingly. Response: These computations are shown with the dewatering orifice detail. 4. The limits of disturbance should cover the grading easement. Response: The limits of disturbance match the grading easement. 5. The silt fence at the northwest corner by the biofilter should be on the downhill side of the diversion dike, and the diversion should direct silt into the trap. Response: The silt fence and diversion dike have been changed as requested. D. Boundary Adjustment and Easement plat(WPO 200500012): 1. Drainage easements must be provided for water passing through the site from off- site. This is on the system from 2-1, which was added with this revision, and downstream to continue through to the property line. A sample sketch is provided for the required easements. Response: These easements have been added. 2. In addition to the easement shown on the sketch, easements are required over stormwater management facilities and access to them (as referenced in the stormwater facilities maintenance agreement). Such easements usually cover the 100 year inundation level, the berm and outlet structures, and a vehicle access route from a public road. An easement has been provided for the BMP at the rear of the site,but not for the basin or access. [Design Manual section 1100] Response: Access to the stormwater management facilities has been provided through a note on the plat. Charlottesville Self Storage at Crozet 3 WWA Project#204135.00 Final Site Plan Responses March 21, 2005 County of Albemarle,Virginia We trust these revisions and responses meet with your approval. Should you have questions or need further information, please feel free to contact our office. Thank you. Sincerely, WW Associates ilzhy . seep.p) Amy K. Seipp, PE Project Manager Charlottesville Self Storage at Crozet 4 WWA Project#204135.00 Final Site Plan Responses March 21, 2005 Page 1 of 2 From: Glenn Brooks Sent: Monday, March 21, 2005 1:47 PM To: 'pleary@wwassociates.net' Subject: RE: Charlottesville Self Storage @ Crozet;SWM access easement OK From: Patrick Leary [mailto:pleary@wwassociates.net] Sent: Monday, March 21, 2005 12:50 PM To: 'Glenn Brooks' Subject: RE: Charlottesville Self Storage © Crozet;SWM access easement Glenn, You are correct I worded that improperly it should read "The right is herby reserved for the County of Albemarle and its agents to access, and when necessary perform inspection and maintenance duties on, all Storm Water Management facilities within the easements shown on this plat through and across this property." Patrick From: Glenn Brooks [mailto:GBROOKS@albemarle.org] Sent: Friday, March 18, 2005 3:42 PM To: 'pleary@wwassociates.net Subject: RE: Charlottesville Self Storage @ Crozet;SWM access easement Mr. Leary, I'm open to providing a note for access. Without going through the county attorney, I'm curious how the county can reserve a right on private property. Should the note say the right is reserved without specifying by whom. Wouldn't it be the owner reserving the right or easement for the county to inspect/maintain etc.? From: Patrick Leary [mailto:pleary@wwassociates.net] Sent: Friday, March 18, 2005 2:57 PM To: gbrooks@albemarle.org Subject: Charlottesville Self Storage @ Crozet;SWM access easement Mr. Brooks, I had hoped to provide access to the Storm Water Management with a note on the cover page of the plat, which is to be filed. Although there would be no plotted, specifically defined easement, a note on the plat would be the"instrument"that would provide unrestricted access to the SWM facilities. The note I am proposing would read as follows: "The County of Albemarle and its agents reserve the right to access, and when necessary perform inspection and maintenance duties on, all Storm Water Management facilities through and across this property." I believe this statement on the plat will still provide unfettered access without adding another odd shaped easement to the already crowded plat and further it does not limit the county as to where it has to travel to enter these facilities. If this is not acceptable or you would like me to revise this statement in any way, please let me file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\SWM access easement ... 3/21/2005 Page 2 of 2 know. Thank You, Patrick D. Leary, L.S. 'W1N.Associates, Inc 147 Mill Ridge Road Lynchburg, VA 24502 (434) 582-6177 Direct (434) 582-6175 Main (434) 582-6179 Fax pleary@wwassociates.net file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\SWM access easement ... 3/21/2005 Page 1 of 1 From: Glenn Brooks Sent: Monday,March 21, 2005 11:56 AM To: 'eschrader@wwassociates.net' Subject: RE: crozet inlet comp Eric, Thank you for these tabulated computation results. Please, as we discussed before, for at least one case, inlet 2- 2 for example, also provide the calculations themselves, with nomographs, area maps, detailed computer output, etc. Thank you, Glenn Brooks, P.E. Senior Engineer Albemarle County From: Eric Schrader [mailto:eschrader©wwassociates.net] Sent: Friday, March 18, 2005 4:38 PM To: 'Glenn Brooks' Subject: RE: crozet inlet comp file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\comps again from Eric ... 3/21/2005 Stormwater Inlet Computations W ENGINEERS Project: Charlottesville Self-Storage at Crozet By: AKS IIM SURVEYORS PLANNERS WWA Project Number: 204135.00 Date: 2-25-05 ASSOCIATES INLET INLETS ON GRADE SAG INLETS ONLY t N U VI wri Oa _O .... C r w w t R w i 3 t� fn co '- Ca r c o a a s c C o m U REMARKS rn Z I- �- .�. U U a U i d i v V Q ? W a13) Z co 5 E O ix F- cc W Z O E O 0 C3 5 > O. Q I- J t 2 0a co . m J 'O 1-1 DI-5 1.33 0.48 0.64 4.00 2.55 2.55 0.330 0.55 0.18 Drop Inlet in Sump 1-2 DI-1 0.13 0.90 0.12 4.00 0.47 0.47 0.025 4.00 0.10 Drop Inlet in Sump 2-1 DI-7 1.44 0.86 1.24 4.00 4.95 4.95 0.030 6.33* 0.36 Drop Inlet in Sump 2-2 DI-1 0.55 0.90 0.50 4.00 1.98 1.98 0.015 11.33 0.17 Drop Inlet in Sump 2-3 DI-7 1.06 0.78 0.83 4.00 3.31 3.31 0.015 3.33* 0.22 Drop Inlet in Sump 2-4 DI-1 0.07 0.90 0.06 4.00 0.25 0.25 0.015 6.67 0.10 Drop Inlet in Sump 3-1 DI-1 0.57 0.90 0.51 4.00 2.05 2.05 0.015 10.67 0.16 Drop Inlet in Sump 3-2 DI-1 0.33 0.90 0.30 4.00 1.19 1.19 0.015 8.67 0.13 Drop Inlet in Sump 3-3 DI-1 0.18 0.90 0.16 4.00 0.65 0.65 0.040 2.50 0.10 Drop Inlet in Sump 'SUBTRACT 2"LOCAL DEPRESSION PRIOR TO CALCULATING SPREAD FOR DI-7 INLETS 4135WWA inletcalculatorl.xls Page 1 of 1 From: Glenn Brooks Sent: Friday, March 18, 2005 3:42 PM To: 'pleary@wwassociates.net' Subject: RE: Charlottesville Self Storage @ Crozet;SWM access easement Mr. Leary, I'm open to providing a note for access. Without going through the county attorney, I'm curious how the county can reserve a right on private property. Should the note say the right is reserved without specifying by whom. Wouldn't it be the owner reserving the right or easement for the county to inspect/maintain etc.? From: Patrick Leary [mailto:pleary@wwassociates.net] Sent: Friday, March 18, 2005 2:57 PM To: gbrooks@albemarle.org Subject: Charlottesville Self Storage © Crozet;SWM access easement Mr. Brooks, I had hoped to provide access to the Storm Water Management with a note on the cover page of the plat, which is to be filed. Although there would be no plotted, specifically defined easement, a note on the plat would be the"instrument"that would provide unrestricted access to the SWM facilities. The note I am proposing would read as follows: "The County of Albemarle and its agents reserve the right to access, and when necessary perform inspection and maintenance duties on, all Storm Water Management facilities through and across this property." I believe this statement on the plat will still provide unfettered access without adding another odd shaped easement to the already crowded plat and further it does not limit the county as to where it has to travel to enter these facilities. If this is not acceptable or you would like me to revise this statement in any way, please let me know. Thank You, Patrick D. Leary, L.S. WIN Associates, Inc 147 Mill Ridge Road Lynchburg, VA 24502 (434) 582-6177 Direct (434) 582-6175 Main (434) 582-6179 Fax pleary©wwassociates.net file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\SWM access easement ... 3/21/2005 Message Page 1 of 3 From: Glenn Brooks Sent: Friday, March 18, 2005 12:06 PM To: 'aseipp@wwassociates.net' Cc: Jan Sprinkle; Jo Higgins Subject: RE: remaining issues Jo and Amy, I have talked with Jan, the Deputy Zoning Administrator, regarding the parking and grade issues. If the parking on the ConAgra site doesn't exist, or is gravel, removing the markings shown on the plan will be approvable. Regarding the grades, I discussed with her the various options of using travelway grades without parking or loading spaces adjacent. She indicated the storage units would be treated as loading spaces adjacent to the travelway. I hope you can make the cross grades work with 5%. I apologize for any inconsistencies with previous plans approved in the County. If you would like to seek a zoning ordinance modification, I will do everything I can to expedite it. Glenn From: Glenn Brooks Sent: Friday, March 18, 2005 9:41 AM To: 'aseipp@wwassociates.net Cc: Jo Higgins; Jan Sprinkle; Jo Higgins Subject: RE: remaining issues Amy, I just talked with Jo regarding the grades. Before you make any changes, let me talk this over with Zoning. We may see our way around this. I'll let you know. Thanks. From: Glenn Brooks Sent: Friday, March 18, 2005 9:29 AM To: 'aseipp©wwassociates.net' Cc: Jo Higgins; Jan Sprinkle Subject: remaining issues I'll talk over the parking with Jan (from Zoning), if I can catch her today, and get back to you. That just leaves the issue of the grades, and the inlet comps. From: Amy Seipp [mailto:aseipp@wwassociates.net] Sent: Friday, March 18, 2005 9:32 AM To: 'Glenn Brooks' Subject: RE: SWM & Dewatering Orifice Glenn - I will check on the length of the pipe. It may be able to be shortened. As far as the width of the dam, I think we'll leave it at 10 since that's what we've planned on. I think we've covered everything except the parking and I think Jo gave you some info. Eric will be sending you some info on the inlets. Let me know if there's any of the comments you still have concerns about. I think we will be able to get our plans in on Monday or Tuesday. file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\RE remaining issues di... 3/21/2005 Message Page 2 of 3 Thanks for your help! Amy Amy K. Seipp,P.E. Project Manager WW Associates 147 Mill.Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct 434.582.6179 fax aseipp@wwassociates.net www.wwassociates.net Original Message From: Glenn Brooks [mailto:GBROOKS@albemarle.org] Sent: Friday, March 18, 2005 9:04 AM To: 'aseipp@wwassociates.net Cc: Jo Higgins Subject: RE: SWM & Dewatering Orifice Ms. Seipp, Thanks for the details. These look approvable. (I'm a little confused why the pipe appears to go almost 20' beyond the toe of the dam, but I'm guessing you have your reasons. It also appears you can reduce the top width of the dam if desired. I read VSMH Min. Stnd. 3.01, Table 3.01-1 to say you only need 8'.) From: Amy Seipp [mailto:aseipp@wwassociates.net] Sent: Thursday, March 17, 2005 4:20 PM To: 'Glenn Brooks' Subject: SWM & Dewatering Orifice Glenn - Here is our revised SWM detail and the detail and calcs for the dewatering orifice. Let me know if this covers the comments. The SWM detail is now to scale which I think helps. You will also notice that we switched to a notch. Let me know if you have any questions. I'm working on the grading issue still. I'll let you know on that one tomorrow hopefully. Thanks, Amy file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\RE remaining issues di... 3/21/2005 Message Page 3 of 3 Amy K. Seipp,P.E. Project Manager WW Associates 147 Mill Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct 434.582.6179 fax aseipp@wwassociates.net www.wwassociates.net file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\RE remaining issues di... 3/21/2005 PERMANENT STORM WATER STRUCTURE WSE ELEVATONS 100-YR WSE = 650.36 25-YR WSE = 650.24 10-YR WSE = 650.13 TOP OF EMBANKMENT = 652.95 2-YR WSE = 649.90 NOTE: PROVIDE 30' WIDE ANTI-VORTEX SEE DETAIL EMERGENCY SPILLWAY ® TRASH RACK 654 ELEV. 650.24 _ 10' NEW 652 PROVIDE OUTLET �� GRADE PROTECTION 3 3 36" CMP RISER CREST 650 EL = 649.91 TRASH RACK 646 24"RCf CMP 4" ORIFICF 644 INV 646 00 CONC BASE 642 )\ / 0 4" ORIFICE 640 o CUTOFF TRENCH AND PIPE CAP ORIFICE FOR USE AS 638 MIN 4' DEPTH '�' TEMPORARY SEDIMENT POND MIN 4' BOTTOM WIDTH v u MAX 1:1 SIDE SLOPES tO 0 634 II tO o o Z nt 632 > NOTE: >z II 630 TO CONVERT SEDIMENT BASIN TO PERMANENT STORM WATER z aMANAGEMENT FACILITY. CUT WEIR NOTCH AS SHOWN IN INSET, a 628 v CAP AND SEAL E&S ORIFICE UNCAP 4" STORM WATER M > pi MANAGEMENT ORIFICE AND ADD TRASH RACK. (Z 626 +� +v +t 624 o N o tNI o.4, SCALE 4: 1 RECOMMENDED DEWATERING SYSTEM FOR SEDIMENT BASINS CALCULATIONS PROVIDE ADEQUATE STRAPPING POLYETHYLENE CAP S = DRY STORAGE AREA = 12 , 825 CF/ / 7 i 0 = S/21 , 600 SEC ( FOR 6 HOUR I ., /1177- DRAWDOWN ) DEPTH Q = 0. 59 CFS I I --- VARIES AS EQ - -- PERFORATED* POLYETHYLENE FORU IDRYD " =7----- DRAINAGE TUBING, STORAGE H = 649. 94 - 648 . 37=1 . 57/2 = 0. 785 \- 7" DIAMETEK �RRISER OF) /r` S ORAGE II \ (-4.- 14,\\\ \ I\I\N A = Q = 0. 59 = 0. 1 39 , . TACK WELD `� "FERNCO-STYLE " STORAGE WET ( 64 . 32xH ) 2( 0. 6 ) [64 . 32( . 7851 ] 2( 0. 6 ) COUPLING ' I 0. 149 2 D = 2X ( 3. 1 ) = 0. 42 = 5" / DEWATERING ORIFICE, STEEL STUB 1 -FOOT MINIMUM, / 5" DIAMETER ORIFICE CORRUGATED METAL RISER INV = 648. 37 NOTE : REMOVE TUBING AND CAP TEMPORARY DEWATERING ORIFICE = 5" ORIFICE AT END OF CONSTRUCTION. CLEAN OUT SEDIMENT FROM POND FOR PERMANENT DIAMETER OF FLEXIBLE TUBING =7 " USE AS A STORM WATER MANAGEMENT FACILITY . * DRAINAGE TUBING SHALL COMPLY WITH ASTM F667 AND AASHTO M294 SOURCE : VA. DSWC PLATE . 3 . 14-15 HEX NUTS WITH WASHERS (ALL 36" DIAMETER MOUNTING HARDWARE CMP RISER TO BE GALVANIZED STEEL.) yY + 1 3' WEIR 1/1 gllrllll4yllllprl0 llllllll'''IIIIIII lllllpl ppUggOODUlllOppl0111O1/11111111111111111111111111 %2" DIAMETER THREADED PLAN VE/W STEEL RODS RISER CREST = 649.9/ A I NV o=649.00 3' WEIR ALONG CIRCUMFERENCE 36" DIAMETER CMP RISER ELEVATION VEIW NOTE: 3' WEIR IS MEASURED BY THE CIRCUMFERENCE OF THE 36"CMP RISER. SCALE 20 : 1 Message Page 1 of 1 From: Glenn Brooks Sent: Friday, March 18, 2005 7:49 AM To: 'aseipp@wwassociates.net' Subject: RE: SWM Calcs That's fine. Thanks Glenn From: Amy Seipp [mailto:aseipp@wwassociates.net] Sent: Thursday, March 17, 2005 5:13 PM To: °Glenn Brooks' Subject: SWM Calcs Glenn - Even though the iterations that Steve Snell suggested were different than iterations of the equation, can I just leave those in the calcs? They don't really mean much since our pond is oversized, so I was just going to leave them alone. I just wanted to make sure that was OK with you. Thanks, Amy Amy K. Seipp,P.E. Project Manager WW Associates 147 Mill Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct 434.582.6179 fax aseip@wwassociates.net www.wwassociates.net • file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\RE SWM Calcs useles... 3/21/2005 Page 1 of 1 From: Glenn Brooks Sent: Friday, March 18, 2005 3:42 PM To: 'pleary@wwassociates.net' Subject: RE: Charlottesville Self Storage @ Crozet;SWM access easement Mr. Leary, I'm open to providing a note for access. Without going through the county attorney, I'm curious how the county can reserve a right on private property. Should the note say the right is reserved without specifying by whom. Wouldn't it be the owner reserving the right or easement for the county to inspect/maintain etc.? From: Patrick Leary [mailto:pleary@wwassociates.net] Sent: Friday, March 18, 2005 2:57 PM To: gbrooks@albemarle.org Subject: Charlottesville Self Storage @ Crozet;SWM access easement Mr. Brooks, I had hoped to provide access to the Storm Water Management with a note on the cover page of the plat, which is to be filed. Although there would be no plotted, specifically defined easement, a note on the plat would be the"instrument"that would provide unrestricted access to the SWM facilities. The note I am proposing would read as follows: "The County of Albemarle and its agents reserve the right to access, and when necessary perform inspection and maintenance duties on, all Storm Water Management facilities through and across this property." I believe this statement on the plat will still provide unfettered access without adding another odd shaped easement to the already crowded plat and further it does not limit the county as to where it has to travel to enter these facilities. If this is not acceptable or you would like me to revise this statement in any way, please let me know. Thank You, Patrick D. Leary, L.S. 14/1V.Associates, Inc 147 Mill Ridge Road Lynchburg, VA 24502 (434) 582-6177 Direct (434) 582-6175 Main (434) 582-6179 Fax pleary ,wwassociates.net file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\SWM access easement ... 3/21/2005 Page 1 of 1 From: Glenn Brooks Sent: Friday, March 18, 2005 8 : 48 AM To: Jan Sprinkle Cc: Amelia McCulley; Bill Fritz Subject: FW: CSS at Crozet fyi From: Musxit@aol.com [mailto:Musxit@aol.com] Sent: Friday, March 18, 2005 8:29 AM To: Gbrooks@albemarle.org Cc: aseipp@wwassociates.net Subject: CSS at Crozet Glenn - Sorry. I completely misunderstood your concern . The parking lot at the rear of the ConAgra site has been blocked off with 6ft gate on the East send and a wooden barricade at the west side for some time . It has been used for a UVA student project to drive around a solar golf cart . At some point in the future , this property will be redeveloped and incorporated into some other use . I am not sure how to cover this except to acknowledge that the re- use of the con Agra site has been subject to the zoning clearance process as necessary and any use in this area will require the same . So Sorry for the misunderstanding on my part. Amy was correct and I just read the entire thing wrong . Your assistance is greatly appreciated as always . Your timely review is helping to make up for the time when the submittal was apparently lost internally. Thanks ! Jo Higgins 2463 Browns Gap Tnpk Charlottesville, Va 22901 Office (434) 823 - 1224 FAX(434) 823 - 1720 Cell (434) 242 - 3080 email "musxit@aol.corn" file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\FW CSS at Crozet for... 3/21/2005 Page 1 of 2 From: Glenn Brooks Sent: Friday, March 18, 2005 8: 22 AM To: Jo Higgins Cc: aseipp@wwassociates . net; Jan Sprinkle Subject: RE: Self Storage at Crozet grading and details Thank you , Jo. I 'm not sure we ' re talking about the same area, but if what you say is clarified on the plan , I 'm sure it will be fine . I 've attached a scan from the plan , to make sure we ' re talking about the same place , and to let Jan know, whose also looking at the plan . . r '• �;�5.` �' ,.. _ y i '4 i. r y. i;-. � \ Q 1' :. r Ff \ \ •Fit, ! '`\4 ♦`\\, } ''. -•• • U.EV."� °1 tFcP ♦ 1 From: Musxit@aol.com [mailto:Musxit@aol.com] Sent: Friday, March 18, 2005 8:09 AM To: Gbrooks@albemarle.org Cc: aseipp@wwassociates.net Subject: Fwd: Self Storage at Crozet grading and details In a message dated 03/17/2005 11:07: 48 A.M. Eastern Standard Time , GBROOKS@albemarle .org writes : Al: If I understand correctly, you are proposing to truncate the existing parking on the ConAgra site, such that it could not meet ordinance requirements [18-4.12]. I would prefer there be no file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\reply to Jo RE Self Sto... 3/21/2005 ,. . ‘, .1.1-.-.....,-............:-.i ‘cetP -,Yhrt ? ':i f, i , /, , , II -!. lLj.•. •gek cd \ 1 co c' r !\ . • "ate TNllatialS 44 '►w • :r t,•: I r / / . :• :I•:4:' .I' ••C. �\ ` <\ \ • • • • / ••' . v • . \ \k • • • . / • t CSi9• 1. dopy d° d°l '•1.' ' '• `• ' . t • • • 1 'NU i ' i ' • . • a i.4 . • •I .i. ...II\ \ • • • • t. \ + 'F• '•i / fi '. ` _ 3 8 • asSb3. . ' r a_ • rr! •raB .S• . .. s00OL9 o 'I , • • • • t,/ 6ptidp 3dl . ///I ��t ' I' r • I/ . r .,,,.a."..-- •Vi ` owning N r3 0 ONN g'^" 3 JO1S 3 .°0'42 c 'Nld - 7411181°, I Page 2 of 2 parking and the paint striping be removed, as we talked about in our meeting. However, I will leave that for the Zoning Administrator to decide. In any case, as we talked about, the plan should show areas to be repaved, or left grass, etc. Hello Glenn - The existing area used for parking that is to be served by the new commercial entrance that is a joint access located on the property line between the two parcels is to remain the same . It will not be truncated. On the existing conditions sheet , the lines shown on the parking area nearest the ConAgra bldg are misleading because there is a travelway that connects that parking area to the gravel area adjacent to the Self storage facility. The ConAgra parking is being utilized to support the employees from the office operation in the old ConAgra bldg across the street. Most of this area or at least the portion immediately adjacent to the self storage facility is gravel that is not paved and does not have pavement markings . It is ringed by concrete bumper blocks and has a row down the center that provides definition to the parking spaces . The connection from the new entrance ties in at the corner of this area and into what is an existing travelway. If you like I can take a digital photo and email to you . The new entrance will have no net affect on that adjacent parking lot. At this time , the ConAgra reuse has been ongoing but to accomodate the construction of the storage facility the parking near the new entrance has been blocked off. As the new ownership entity of the self Storage Facility (will take effect after the plat is recorded and the site Plan approved) , we will work cooperatively with the manager of the ConAgra operation to make sure that any disruption is minimized and there is no loss of parking on their side . with respect to the notes on the site plan , the new entrance tie in shown as gravel and is intended to match the existing . It is a redundant entrance to the adjacent parking . Actually, this new joint entrance is replacing the existing entrance at the East edge of the property and a couple old curb cut entrances that still exist. It was envisioned by VDOT as the first step to consolidating entrances and creating a turn lane along the frontage of properties on this stretch of RT240. Hopefully, this satisfies your concerns . Jo Higgins 2463 Browns Gap Tnpk Charlottesville, Va 22901 Office (434) 823 - 1224 FAX(434) 823 - 1720 Cell (434) 242 - 3080 email "musxit@aol.corn" file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\reply to Jo RE Self Sto... 3/21/2005 Page 1 of 3 From: Glenn Brooks Sent: Friday, March 18, 2005 12:36 PM To: 'eschrader@wwassociates.net' Cc: 'aseipp@wwassociates.net' Subject: RE: crozet inlet comp Your method description sounds adequate. Thanks for the notice. (Strange, I've never ever encountered a file too big to download.) From: Eric Schrader [mailto:eschrader@wwassociates.net] Sent: Friday, March 18, 2005 9:42 AM To: 'Glenn Brooks' Cc: aseipp@wwassociates.net Subject: RE: crozet inlet comp Glenn- I attempted to download the HY-22 software and was not able to, the file was too big. Instead, I will use the performance curve for DI-1 and DI-7 appendix 9c-13 & 9c-14 to determine the depth of ponding. Then I will calculate the spread based on the slope and local depression. You are correct DI- 1's do not have local depressions, DI-7's do. All inlets will be sump inlets. We will add a note to the plans stating that all grate inlets shall be installed in a 3" localized sump when placed in on grade locations. Let me know if you feel this is adequate. Eric E. Schrader P.E. Project Engineer WW Associates 147 Mill Ridge Road Lynchburg, VA 24502 USA Phone: (434) 582-6175 Email: eschrader@wwassociates.net URL: www.wwassociates.net Original Message From: Glenn Brooks [mailto:GBROOKS@albemarle.org] Sent: Thursday, March 17, 2005 4:35 PM To: 'eschrader@wwassociates.net Cc: 'aseipp@wwassociates.net' Subject: RE: crozet inlet comp Mr. Schrader, I have looked this over. You were right, it is a very limited output. I suggest you abandon that software and use HY-22 Visual Urban, available for free at http://www.fhwa.dot.go v/engineering/hydraulics/software.cfm A few things I pondered about this output, beside the Qi that you pointed out; We are not using slotted drains on this site. The inlets are not all in sag locations. There are no 5.25'x3'grates. There is no local depression for DI-1 grates. There is no curb or 2'gutter, or gutter cross slope of 11.3%. file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\RE crozet inlet comp r... 3/21/2005 Page 1 of 2 From: Glenn Brooks Sent: Thursday, March 17, 2005 4:35 PM To: 'eschrader@wwassociates.net' Cc: 'aseipp@wwassociates.net' Subject: RE: crozet inlet comp Mr. Schrader, I have looked this over. You were right, it is a very limited output. I suggest you abandon that software and use HY-22 Visual Urban, available for free at http://www.fhwa.dot.gov/engineering/hydraulics/software.cfm A few things I pondered about this output, beside the Qi that you pointed out; We are not using slotted drains on this site. The inlets are not all in sag locations. There are no 5.25'x3'grates. There is no local depression for DI- 1 grates. There is no curb or 2' gutter, or gutter cross slope of 11.3%. As a suggestion, you might reference HEC-12, page 69, section 8.1. or HEC-22, page 4-30. Also, as I pointed out to Ms. Seipp in our meeting on Monday, you might consider using the nomograph for pavement flow and spread in a triangular(no curb)section. Thank you, I look forward to hearing from you again. Glenn Brooks, P.E. Senior Engineer Albemarle County From: Eric Schrader [mailto:eschrader@wwassociates.net] Sent: Thursday, March 17, 2005 3:06 PM To: GBROOKS@albemarle.org Subject: crozet inlet comp Glenn- Inlet 2-1. Output data. I will change from 0.37'to 0.38'. The software takes into account the 2" of local depression when calculating spread (6.95'). The spreadsheet we sent does not. I will update. I don't know why the Q is shown as 5.4 cfs. I inputted 4.95. Let me know what else I can send. Eric file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\RE crozet inlet comp r... 3/21/2005 Page 1 of 1 From: Eric Schrader [eschrader@wwassociates.net] Sent: Thursday, March 17, 2005 3:06 PM To: GBROOKS@albemarle.org Subject: crozet inlet comp Glenn- Inlet 2-1. Output data. I will change from 0.37' to 0.38'. The software takes into account the 2" of local depression when calculating spread (6.95'). The spreadsheet we sent does not. I will update. I don't know why the Q is shown as 5.4 cfs. I inputted 4.95. Let me know what else I can send. Eric c.�K:1,ENGINE•-.1yHEC-12\HY12.EXE ROADWAY & DISCHARGE DATA Cross—Slope Sx a (ft/ft) (ft/ft) (ft) (in) L. depression 0.030 0.113 0.013 2.00 2.00 INLET INTERCEPTION Inlet Type Qi * Sag * (ft) (in) (ft) (ft) (cfs) Slotted Drain 5.25 36.00 6.95 0.38 5.40 Clogging Factor = 0.0z Eric E. Schrader P.E. Project Engineer WW Associates 147 Mill Ridge Road Lynchburg, VA 24502 USA Phone: (434) 582-6175 Email: eschrader@wwassociates.net URL: www.wwassociates.net file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\crozet inlet comp.htm 3/21/2005 • Stormwater Inlet Computations Project: Charlottesville Self-Storage at Crozet By: AKS S PLAvo. W WA Project Number: 204135.00 Date: 2-25-05 ASSOCIATES INLET CURB INLETS ON GRADE CURB SAG INLETS ONLY o a n a a V ,�s : o Q ` S o E $ V T - C 5 CC t V W 5 Q L F/ q q L w C Z t FF T O C v 4 a q J �m m d 'u -� o w 3 $ 2 m t o c°i u m o O 1n 1 27 REMARKS _f 'a' u t)iii re v 'c v Z. i .°� u n m e c3 s: `o•'04 "� ei �`e g J m E. m o 44. a C $ y y� o z W o c O 0 tag s0 I. (9 p E. j.a N T. ti = V < n .. C~ J a a O q N ; W a N f a o C t J C 13 Ti 1.1 01.5 1.33 0.48 0 64 4.00 2 55 2 55 0 330 0 82 0.27 Drop Inlet In Sag 1-2 DI-1 0 13 090 0 12 400 047 0 47 0.025 8 80 0 22 Drop Inlet In Sag 2-1 01.7 1.44 0 86 1.24 4.00 4 95 4 95 0 030 12 33 0 37 Drop Inlet in Sag 2-2 DI-1 0 55 0 90 0 50 4 00 1 98 1 98 0.015 13 33 0.20 Drop Inlet In Sag 2-3 DI-7 1 06 0 78 0 83 4 00 3 31 3 31 0 015 14 00 0.21 Drop Inlet In Sag 2-4 DI.1 0 07 0 90 0 06 4 00 0 25 0.25 0 015 10.67 0.16 Drop Inlet In Sag 3-1 01.1 0.57 0.90 0 51 4.00 2 05 2 05 0 015 14 00 0.21 Drop Inlet In Sag 3-2 DI-1 033 090 030 400 1 19 1 19 0.015 10 67 0.16 Drop Inlet In Sag 3-3 01.1 0 18 0 90 0 16 4 00 0 65 0.65 0.040 4 25 0.17 Drop Inlet In Sag fl Ee..- tz V 4135W WA_Inlel rak4alat.xis Message Page 1 of 3 From: Amy Seipp [aseipp@wwassociates.net] Sent: Thursday, March 17, 2005 11:36 AM To: 'Glenn Brooks' Subject: RE: Self Storage at Crozet grading and details Glenn - I will get you more information on the inlets. We have a person who used to work at VDOT doing the calcs, so I will make sure how he's getting his numbers. I showed him the nomograph, so he might just need to take some things out of his spreadsheet to I will also look at the grading again and see if there is something else that we can work out. I don't think they want to do a waiver request or anything that might take extra time. If I can somehow change the end grades of the traveiway without exceeding 5% and also keeping the 1%, I'll just change the grades. I'll let you know what I come up with. Thanks! Amy P.S. The SWM detail is almost done and I will he sending it via PDF shortly. Amy K. Seipp, P.E. Project Manager WW Associates 147 Mill Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct 434.582.6179 fax aseipp@wwassociates.net www.wwassociates.net Original Message From: Glenn Brooks [mailto:GBROOKS©albemarle.org] Sent: Thursday, March 17, 2005 11:06 AM To: 'aseipp@wwassociates.net Cc: Jo Higgins Subject: RE: Self Storage at Crozet grading and details Ms. Seipp, Thank you for the pre-submittal information. I've tried to answer your questions below. Al: If I understand correctly, you are proposing to truncate the existing parking on the ConAgra site, such that it could not meet ordinance requirements [18-4.12]. I would prefer there be no parking and the paint striping be removed, as we talked about in our meeting. However, I will leave that for the Zoning Administrator to decide. In any case, as we talked about, the plan should show areas to be repaved, or left grass, etc. A3: If I understand correctly, you are saying the outside of your travelways are not really travelways, but loading ramps. This is a clever new way to talk about travelways in loading areas. So, as I understand this, you are not proposing to change the building or grades at all. You are proposing that your grades should not be regulated under ordinance section 18-4.12.15c, which states, "The maximum grade for parking spaces, loading spaces, and access aisles abutting parking or loading spaces shall not exceed file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\Seipp response RE Self... 3/21/2005 Message Page 2 of 3 five (5) percent in any direction." I'm having trouble with this approach. I don't feel I could approve it without consulting others. I don't recall this being done with any previous storage centers, and I feel it would set a precedent to be used on future storage centers. I would have to treat it as a modification or waiver request, under section 18.4.2.c.2, which must be approved by the Zoning Administrator. Regarding the computations. You are still showing the tables and formulas that do not apply. Could you give me a clue as to how you are getting your numbers? Are you using the pavement spread nomograph I showed you in our meeting? How are you getting the inlet depth? Thanks, I hope we can work these things out before you submit another plan. I look forward to receiving the stormwater details we talked about also. Sincerely, Glenn Brooks, P.E. Senior Engineer Albemarle County From: Amy Seipp [mailto:aseipp©wwassociates.net] Sent: Thursday, March 17, 2005 9:52 AM To: 'Glenn Brooks' Subject: Crozet Glenn- Good Morning! After talking with the owner(Ms. Higgins), here are a couple of things I wanted to run by you regarding the comments. Al - As far as the parking spaces to remain on the Con Agra site, the owner of the Con Agra building does not want us to do anything with them. They are selling only the 6.18 acres to the Self Storage and allowing temporary grading. Where the pavement is broken up, grass will be replaced. They(the Con Agra owners) have future plans that we do not know of and they said they would prefer not to have it re-striped because the plant is shut down and no one parks there. Please let me know if this will be a problem A3 - I talked to Jo about adding an extra step to the buildings. Apparently it is not possible. I also mentioned revising the grades,but there was defmite concern that the longitudinal slope of 1.0%would be lessened or that it would cause a domino effect and result in regrading of the entire site. The self storage owners do not want less than a 1% longitude grade so that water does not stand between the buildings. The first 5' are what they consider a ramp transition for people to get into the storage facility with their cars and also keep water away from the doors. I have attached a pdf sketch of something that might help. The travelway is at 5%cross-grade. In addition to that sketch, I am attached revised inlet spread comps for you to look at. Hopefully by the end of the day I will have a revised detail of the SWM structure (to scale) to fax you. The rest of the comments are straight forward and we are revising them on the plans. The owners would like us to resubmit tomorrow or Monday, so that's what we're shooting for. file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\Seipp response RE Self... 3/21/2005 Message Page 3 of 3 Please let me know if you have any questions. Thanks! Amy Amy K. Seipp,P.E. Project Manager WW Associates 147 Mill Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct 434.582.6179 fax aseipp@wwassociates.net www.wwassociates.net file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\Seipp response RE Self... 3/21/2005 • o 0 FIN. FL. FIN,'EL. ELEV: 658.00 ELEV,.' 657.00 [ STORAGE BUILDING F ,TOP OF ROOF ' TOP OF ROf)F-___ ELEV. -Q70.00 ELEV. = 669.00 5"' CAMP TRAI $ITION -"-° - • • 2 0 ' -T R AV FL WAY -- • 5' RAMP TPANSITIO\ ° I FIN. IN FL. STORAGE BUILDING E FIN. FL. [f ELEV. = 658.00 ELEV. = 657.00 • - TOP OF ROOF TOP OF ROOF ELEV. = 670.0 ELEV. = 669.00 ° u 5' RAMP TAICSITION ° 1 .o% 20 ' T RAV k L WtAY • 5' CAMP TA\SITION • II FIN. FL. FIN. FL. [ ELEV. = 658.00 STORAGE BUILDING D ELEV. = 657.00 TOP OF ROOF TOP OF ROOF ELEV. = 670.00 ELEV. = 669.00 ° 5' - AMP TAiSI— 0\• 1 .0% 2 0 ' TRAVH L SAY 5 BAN P Page 1 of 2 From: Glenn Brooks Sent: Thursday, March 10, 2005 5:26 PM To: 'aseipp@wwassociates.net'; 'hwhite@wwassociates.net' Cc: Amelia McCulley; Bill Fritz; Jo Higgins; 'David Jensen' Subject: Charlottesville Self Storage in Crozet, County eng review Dear Ms. Seipp and Mr. White, I received your plan resubmittal yesterday(9 Mar). This was a surprise to me. I am sorry you did not take up my earlier suggestion to meet before you resubmitted the plans, but understand your desire to quickly turn-around your revision, considering our delays with the last review. I apologize for that delay, and have reviewed your revised plan immediately upon receiving it. I have completed the review today. I would like to meet with you to give you these comments in person. I feel this would help a great deal, both in making sure I understand your plan and am not giving unnecessary comment, and making sure you know what I will be looking for with revisions. I called your office today to set up a meeting for tomorrow, but neither of you were available. I was directed to Doug at your Charlottesville office, whom I talked to about this meeting. He has told me the right people will not be available this week. Please let me know when you, or your representatives can meet next week, and I will reserve a meeting room here at the County office building. I am currently available on Monday or Tuesday morning. I will tentatively reserve a Monday morning time of 9:00am. , I will wait to here from you. If you would prefer not to meet at all, or do not have time next week, please let me i' know, and I will send the comments directly. • Sincerely, Glenn Brooks, P.E. Senior Engineer Albemarle County From: Amy Seipp [aseipp@wwassociates.net] Sent: Tuesday, February 22, 2005 2:55 PM To: Glenn Brooks Subject: Charlottesville Self Storage @ Crozet Mr. Brooks - We are in the process of gathering additional information and working on calculations for our resubmittal. Once we have our ducks in a row, we will give you a call. Thank you for your interest. Sincerely, Amy K. Seipp,P.E. Project Manager WW Associates 147 Mill Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\Another call for a meet... 3/21/2005 Page 2 of 2 ' 434.582.6179 fax aseipp@wwassociates.net www.wwassociates.net • file://C:\GEB\Eng work\Eng work 2005\Cville Self Storage Crozet\Another call for a meet... 3/21/2005 of A ®ice OA' i 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: Crozet Self Storage Plan preparer: WW Associates,Inc. [fax 582-6179] Owner or rep.: Route 240 LLC/Princess Ann Dev.LLC [no fax given] Plan received date: 9 Mar 2005 Date of comments: 10 Mar 2005 Reviewer: Glenn Brooks Thank you for attending our meeting. I think it went a long way toward clarifying the review and the comments below. Hopefully,we can finish the review with the next revision. I am available for questions or for another meeting if necessary. . Final site plan(SDP200400106) 1Please clarify on the plan how off-site parking,travelways and paving are to be retained,or modified to meet Zoning Ordinance requirements. Travelways and parking spaces are shown being cut. Please show new paving, and revised paint striping, or removal of the old paint. [18-4.12.15] V . Please clarify the rip-rap outlet channel dimensions. Detail B-B,sheet 13A does not appear to be used on the plans. [18-32.6.6d] Please correct the grading so that a 5%slope is maintained in the travelways between buildings. Currently up to a 7%cross slope is shown with the spot grades. Please revise the inlet spread computations accordingly. Please use intensity values of 4 in/hr for spread, and grate inlet types as shown on plans. Please ensure spread is below half the travelway width(15'). The current computation indicates spreads over this amount. (Please feel free to send these computations ahead of your submittal so we can agree on them.)[18-4.12.15c,Design Manual section 505G] B.Stormwater management plan (WP0200500012) ✓1. Physical discrepancies need to be corrected on the basin details. It is recommended that the details for the basin be drawn to scale. The 24" orifice actually cuts into the crest of the riser and doesn't physically work as computed. The 3"pipe on the drawdown device detail will not allow a 4" orifice. The low flow pipe doesn't have a length specified,but the fill behind the headwall would appear to cover part of the 24" orifice in the riser. 24" is also a pretty large cut out of a 36"pipe. Aside from these physical glitches,the basin appears to be larger than necessary,which is approvable subject to the physical discrepancies being corrected,and computations adjusted accordingly. 0 A stormwater management facilities maintenance agreement must be approved prior to approval of the construction plans. I understand you wish to provide this after the easement plat is recorded. C.Erosion and sediment control plan(WP0200500012) . lease provide the basin and trap dimensions (bottom,weir elevations,cleanout elevations,temporary i. rifices,baffles,collars,etc.)on the plan so that County staff can properly inspect these facilities. The ifferences between the permanent structures and the temporary structures should be made clear on details and plans so adequate conversion can be accomplished. 2. 'Please provide computations for the trap volumes demonstrating they meet the minimum volumes required. Set the weir elevation and dimensions accordingly on the plans. Albemu ounty Community Development Engineering Comments page 2 of 2 V . Please provide a computation for the sediment basin dewatering orifice, and revise the plan details accordingly. V4. The limits of disturbance should cover the grading easement. V5. The silt fence at the northwest corner by the biofilter should be on the downhill side of the diversion dike,and the diversion should direct silt into the trap. D. Boundary Adjustment and Easement plat(WP0200500012) V 1. Drainage easements must be provided for water passing through the site from off-site. This is on the system from 2-1,which was added with this revision,and downstream to continue through to the property line. A sample sketch is provided for the required easements. 2. In addition to the easement shown on the sketch,easements are required over stormwater management facilities, and access to them(as referenced in the stormwater facilties maintenance agreement). Such easements usually cover the 100yr inundation level,the berm and outlet structures, and a vehicle access route from a public road. An easement has been provided for the BMP at the rear of the site, but not for the basin or access. [Design Manual section 1100] st. • l iO. , ' ue �4 t.�=�: r rcr m .�';a,l .... 1 y,�.� - •'per _ 7 es 771• L.j a+st}. h.w` 40r+% F6 0 / p7 M1NeMicYN 7b - T ,� 'i s, c,,,,,,4414-nex-. , '1*, __, /0 ,:,,,1,,.-,, / ' i4, 1061.04(TOTAL) ` FyC Lfg 'f^ Wit. f i.' sr ,.. _ Copy:file File:E3_fsp,swm,ecp,fpt_GEB_Cville Self Stor Crozet.doc 101/44* T _--1 Q _0.56 S 1.67 SO.S T2.67 ) X d c 5l. EXAMPLE GIVEN: S n=0.016; Sx=0.03 0 S=0.04 ; T =6 FT 0.8-- 0.2 FIND: 0.6�-40 0 =2.4 FT3/S -_ on=0.038 FT 4'S 0 4- 0.1 w • •_ _z -20 T (FT) - 0.06 c1 . use z ,0.04 0.005 30 — 0.2— 44c • i10 O01 20 - M� - 8 0.02 0.I-k-5 ♦ , v 0.08 0.01 0.02 �_ O 0.06f4 • 10 0.008 3S `p,o 0.006 ' Q04 8 _- 0.04_= 0.004 �. _6 2 . ----------->< 0.08Q02 4 - cit Z-! ; --•2c f 0.002 0.1 -I n=o.o Q. 3 - -0.8 0.001 0.01-..0.6 2-2 Z•Sci 2 - 0.008 vt= 0.•12 For V-Shape, use the nomograph with 0.006 --0.4 `S+i Sx2 Sx=Sx,Sx2/( Sx1 + Sx2) 0.004- 0,07 0.01 -0.2 O.035 aot p,O/ O,d05- CHART 1 Flow in triangular gutter sections. 4-41 (Rev. 6/ 85) \8 -.♦ •tb..0 0.4, phi n ♦ �w i - �\ Ss2e� \ q/�FgS o��.0 9�g� �\�� - 1 �� y�� �C299�sq(d�♦ S7)B4S7 i CO r ♦♦♦1 / ZiisrS iy`1 �C m I g \' \..,�`-.��. 6./6' �' plc ' • --... � �� ���-- _ _ NEW20. - / i r is . �3' � ir -�� --—--__------- V-VATS- - ---- ENT _E-' - -- ----- ---- r ,: C----CA --E IN ���, �.,/ - !_ + N43.4_4_'_59_N. 532 �"';. OAF lbw �1 `- �C�'�� .• ;rif�r; 'r" EXISTIN�G,�20� NI Y E-5 ---------------- TIE DISTANCE - SA 219.87 r r 'a.�• • i., 3� 1�1 • N• I f T`-- TO per' S,<, i gP-+ i t�` ..' lb` N/---bii?': •,Cl / w/ /I Fq cs,'q F0 !r TA90USF i p�_�acl.,/ r eF ��lb 64-0 j•ob`•gib" r I i 1 ' T9/� c 5v�`,�/ 4cs4 4TF0� /. //�'9SF 0 Al u_-.�.� i ;' i! ,,,, i� MFNT t'10F � Ma • P0,14 C vive 4tflele- "'Cif C f �OyF A;04: 04943��010 ( q5O�ssq�(2)`7♦S O� yb9 9 ��iSTirii��yF��oF29 / ��/�A30% 9i4( I 0�6''YT•-%'' �G 9368 r OO,B• Bg0 /y3c/ • ) i 8<'0.°A�9 ST . i A936 r r + r I 916.37 S43'44'59"E \x i 1061.04 (TOTAL) z�FENCEx LINE X�— dip Gal io1440 W- SDP -2004-106 Charlottesville a Storage @ Crozet, Route 240 Page 1 of 2 Glenn Brooks From: David Jensen [djensen@wwassociates.net] Sent: Wednesday, March 09, 2005 8:54 AM To: Glenn Brooks Subject: RE: SDP -2004-106 Charlottesville Self Storage @ Crozet, Route 240 Can Do Glenn!! Thanks, David M. Jensen, PE Manager Charlottesville Operations 1402 Greenbrier Place Charlottesville, VA 22901 Phone: 434.978.2908 Fax: 434.978.1444 djensen@wwassociates.net www.wwassociates.net From: Glenn Brooks [mailto:GBR00KS@albemarle.org] Sent: Wednesday, March 09, 2005 8:46 AM To: 'David Jensen'; 'hwhite@wwassociates.net Subject: FW: SDP -2004-106 Charlottesville Self Storage @ Crozet, Route 240 Please forward this VDOT approval to the appropriate persons in your organization. Thank you. Glenn Brooks, P.E. Senior Engineer Albemarle County From: Steven Snell Sent: Wednesday, March 09, 2005 8:44 AM To: Glenn Brooks Subject: FW: SDP -2004-106 Charlottesville Self Storage @ Crozet, Route 240 From: Kesterson, Jimmy [mailto:Jimmy.Kesterson@VDOT.Virginia.gov] Sent: Wednesday, March 09, 2005 8:44 AM To: Steven Snell Cc: Francis MacCall Subject: SDP -2004-106 Charlottesville Self Storage © Crozet, Route 240 Steve, The above referenced plan with revisions dated 3-2-05 appears to have addressed our previous comments and should be satisfactory for approval. Please advise the applicant they must obtain a permit from VDOT prior to commencement of any activity within the right of way. 3/9/2005 SDP -2004-106 Charlottesville E'-"Storage @ Crozet,Route 240 Page 2 of 2 Jim Kesterson 3/9/2005 ENGINEERS SURVEYORS PLANNERS ASSOCIATES TRANSMITTAL To: Glenn Brooks/ Steve Snell Date: March 7, 2005 Engineering County of Albemarle Project. No.: 204135.01 401 McIntire Road, Room 227 Charlottesville, VA 22902-4596 Project: Charlottesville Self Storage @ Crozet MAR 0 7 2005 COMMUNITY DEVELOPMENT Number Spec. Section/ Copies Drawing No. Description 2 Revised Final Site Plans 2 Revised Plats 2 Revised SWM/ESC Computations Glenn/ Steve—Enclosed are plans and plats addressing your February 9, 2005 comments. We trust these revisions meet with your approval. Should you need clarification or any additional information,please feel free to contact me. im.v jI9 , Thank You, a /•`'a el,/ado.. tag 2S" WW Asso iates By: 454 577 of i Amy eipp, PE �e eetel'.,1/_6 c A /p4, ,fie Project Manager cc: w/ copies of referenced data w/ copies of referenced data 147 Mill Ridge Road•Lynchburg,Virginia 24502 Telephone(434)582-6175 •Fax(434)582-6179 Lynchburg•Charlottesville County of Albemarle,Virginia _1 CHARLOTTESVILLE SELF STORAGE AT CROZET FINAL SITE PLAN RESPONSES March 7, 2005 To: Glenn Brooks/Steven Snell County of Albemarle- Engineering Department From: WW Associates Please find 2 sets of plans with the following responses towards the comments received from the County of Albemarle Engineering Department, dated February 9, 2005. Each comment has been reviewed and a written response given as to how the comment was addressed and where to locate the changes on the plans. Should you have any further questions, please feel free to contact our office. A. Site Plan and Drainage Plan: 1. Please provide drainage computations for the proposed stormwater pipes. Include 2-year calculations for velocity and 10-year calculations for capacity. [18- 32.6.6d4, DM505E1, DM505E7, DM909.1A, DM505D] Response: Two copies of the computations have been included for your review. 2. Please include spread computations for the proposed ditches and drop inlets. The spread should be designed to take up no more than half the travel way it is located within. It would be best to capture the offsite drainage at the property line with a drop inlet to prevent drainage across the westernmost travel way. It would also be best to catch the drainage between the proposed storage buildings with a drop inlets before it crosses the eastern most travel way. [DM909.1A, DM505C, DM505D] Response: Spread computations have been included, See Appendix D. 3. The drainage along the travel way east of Building A (Sheet 7) appears to flow along the eastern side of the roadway then down the existing slope to TMP 56A(3)-9 and bypass the Stormwater Basin. It seems curb and gutter is needed from the dumpster northward until sufficient grade exists to carry the stormwater to the basin. Please take care to have as much stormwater from the parking area and office building drain to the basin. Response: Curb and gutter has been added. 4. The detail for the"Wood Post" (Sheet 13) should include the length of the post to be 8 feet (4"x4"x8'). This will allow the post to act similar to a VDOT Strong Charlottesville Self Storage at Crozet 1 WWA Project#204135.00 Final Site Plan Responses March 4, 2005 Countyof Albemarle,Virginia ik4 g Post where needed along the stormwater basin. [VDOT GR-INS Road and Bridge Standards reference 221.505] Response: The post length has been added to the detail to be 6ft. This will allow 3fi length in the ground. This post and cable feature is tooprotect the trees along the edge of pavement. Along the edge of the basis', the band of trees has been extended to the NE. (Please refer to the landscape plan). There is a gap in the post and cable & trees feature to the right about 70ft after entering the gate. This gap is to allow access to the basin for maintenance. The distance from the edge of pavement at this gap to the crest of the basin is over 50ft at this point and not a direct path. 5. Please include the General Construction Notes in their entirety, unabridged, on the site plan. [DM902B4] Response: These notes are included. 6. A drainage easement for the outlet of the Biofilter is needed. The easement should continue from the edge of the Biofilter easement to the stream bank. [18- 32.7.5.2] Response: This has been added and is shown on the plat. 7. Drainage easements for drainage from the adjacent property through this property will be needed. [18-32.7.5.2] Response: This has been added and will be shown on the plat. 8. The joint access easement will need to be recorded before final approval can be granted. Also, a maintenance agreement will be needed for the joint access. [18- 32.7.5.2] Response: The joint access easement is shown on the boundary line adjustment plat. The joint access easement has been added to the site plan. The maintenance agreement of the joint access easement will be included in the deed to be recorded with the plat. Please advise if the County needs to review this deed. B. Stormwater Management Plan: 1. Please include a detail of the north biofilter. Include a plan view with structures, planting layout and dimensions. And a profile view with structures, materials and elevations. [DM503.1F, VSMH3.11] Response: A detail showing the Wildflower Meadow Biofilter has been included. Charlottesville Self Storage at Crozet 2 WWA Project#204135.00 Final Site Plan Responses March 4, 2005 Countyof Albemarle,Virginia __ g 2. Please include a planting plan for the biofilter. [DM503.2B, VSMH3.11 p.33-38] Response: Please see the Biofilter detail. 3. Please clarify the rip rap detail for the biofilter outlet pipe. This rip rap should follow the proposed ditch centerline, rather than continue beyond the existing ditch and stopping abruptly as shown. [DM803.1C, 505C(4)] Response: The rip rap has been changed to follow the ditch centerline. 4. Please include a profile view for the stormwater basin with dimensions, structures and elevations on the stormwater management plan. [DM909.2A(1)] Response: This detail is shown with elevations corresponding to the calculations. 5. The existing soil types shown on the soil survey are poor soil types for basin construction. Please include the following not on the plan: a) A geotechnical study of the soils to be used in constructing the embankment as well as the embankment foundation must be completed. A geotechnical engineering certification of the adequacy of the foundation and soils to be sued in the embankment is required before construction begins. b) A geotechnical inspector must be present to monitor the construction of the embankment and test compaction. The minimum compacted density will be 95%with the moisture content with 2% of optimum. c) Please add the following note: The embankment must be constructed in a manner to meet all the requirements and specifications of Minimum Standard 3.01 of the Virginia Stormwater Management Handbook. d) Please submit all reports to the Community Development Department. e) Embankment slopes adjacent to detention and retention basins must be 3H:1V or flatters (DSM 503.1.E). Response: These notes have been added to the plan. 6. Two different hydrology methods were used in determining pre and post development flow rates. Please use the same hydrology method for both calculations. It appears the modified rational method should work fine for both calculations. [DM503] Response: The modified rational method has been used throughout in the SWM computations. Please see the calculations submitted. Charlottesville Self Storage at Crozet 3 WWA Project#204135.00 Final Site Plan Responses March 4, 2005 Countyof Albemarle,Virginia g 7. The minimum time of concentration of 5 minutes is assumed in the basin calculations. Please calculate the time of concentration for the longest travel time to assure this is a reasonable assumption. [DM503] Response: The Seelye and Kirpich methods have been used and are shown in the revised SWM computations. 8. The pond routings must show peak inflow, peak volume,peak elevation and peak outflow with a couple of adjacent iterations to show these are peaks. This would most likely include at least several lines of data rather than the two lines shown for each routing. Response: Please see the revised calculations. 9. At least two additional iterations for the direct method should be shown to verify the calculated volumes are correct. At least one lower and one higher duration storm should be used in your model to verify whether the calculated volume is a true peak. [VSMH 5-5, p5-27] Response: Additional iterations have been done,please see the calculations. 10. It appears drainage area B is receiving some minor off site drainage just west of Building E and Building F. Please include a drainage area map to scale with finished grading and refine drainage areas as needed. The scaled down copy of the drainage area map was too small to check for accuracy. [DM909.1A(1)] Response: Drainage area maps are included in the storm water calculations. 11. An approved stormwater maintenance agreement is needed before final approval. [DM909.2B(4)] Response: This will be provided with signature and the $16 fee for recording once the boundary line adjustment plat has been recorded so the deed book page number can be inserted. C. Erosion and sediment control plan: 1. Please show the limits of disturbance on the ESC plan. Response: These have been shown on the plan. 2. Please show the dust control symbol on the plan. [VESH.39] Response: This has been shown on the ESC plan. Charlottesville Self Storage at Crozet 4 WWA Project#204135.00 Final Site Plan Responses March 4, 2005 mtv„W4 County of Albemarle,Virginia 3. Please label the ESC basins on plan. The ESC plan page#11 uses "Bio-Retention area"and"Stormwater Management Facilities"as labels for the basins. Please note these basins will be converted when the site is fully stabilized. Response: A note has been added to convert the ESC basin to a SWM pond and Bio- Retention area. 4. Please give basin computations with the narrative. [p III 79-81] Response: ESC Basin computations are included in the SWM/ESC calculations, please see Appendix E. 5. Please show the bottom dimensions for the basins on the plans per the computations for volume. [p.III-79] Response: The bottom shape of the basin is irregular and corresponds to the same bottom dimension as the SWM basin. 6. Please give detail plans of the ESC basins with elevations labeled, slopes,pipe and riser sizes, etc. [p.III-83] Response: This is shown on the detail sheet. 7. Please include silt fence for the southernmost portion of the site plan that is not draining to the basins. [VESH 3.05] Response: Silt fence has been added. 8. The two diversion dikes/swales east and west of building G should be labeled DV for permanent diversion on the ESC plan. Silt fence should not be used as a diversion [MS 4,VESH 3.05, 3.12] Response: Diversion dikes have been added. 9. It appears grading east of building G is within the"non-disturb"buffer. Please assure the limits of construction do not disturb the"non-disturb"buffer. Response: Grading has been removed from the non-disturb buffer. 10. Please include the Albemarle County Paved wash rack detail with required note on the plan. Provide the standard note for paved wash rack details: "A minimum water tap of 1 inch must be installed with a minimum 1 inch ballcock shutoff valve supplying a wash hose with diameter of 1.5 inches for adequate constant pressure. Wash water must be carried away from the entrance to an approved settling area to remove sediment. All sediment Charlottesville Self Storage at Crozet 5 WWA Project#204135.00 Final Site Plan Responses March 4, 2005 County of Albemarle,Virginia shall be prevented from entering storm drains, ditches or water courses." [DM CH 5 App WR-1, Policy-7] Response: This note has been added. Narrative 11. Note #5 under construction sequence states that the bio-retention facilities are to be installed. These facilities should not be installed until the site is fully stabilized. I believe the basins are needed at the step. Also include a conversion of the basins near the end of the construction sequences. Response: These notes have been included. 12. Please include the basin in the"structure practices". Response: The basins have been included. 13. The narrative list soil type 81 while the soils map shows type 91. Please correct the discrepancy. Response: This has been corrected. 14. The application and fee for ESC was received yesterday. I will not receive the folder with the application for a few days. Rather than hold the review I will do fee verification with the next review. The limits of construction (not shown on this submittal) will be needed for fee verification. [17-209] Response: Noted. We trust these revisions and responses meet with your approval. Should you have questions or need further information, please feel free to contact our office. Thank you. Sincerely, WW Associates Amy K. Seipp, PE Project Manager Charlottesville Self Storage at Crozet 6 WWA Project#204135.00 Final Site Plan Responses March 4, 2005 Mar 08 05 09: 22a WW Associates ( 4341 582 8179 p. 2 COUNTY OF ALBEMARLE Are' A4,4 Engineering Review Submission Form Department of Community Development401 McIntire Road,Room 227 Charlottesville,Virginia 22902-4596 $.�. (434)296-5832 "`NET 4r4otipi Fax(434)972-4126 c,DD—oL - �a Project Name: Charlottesville Self Storage at Crozet From(Name or Firm): VVVV Associates Date: March 7, 2005 (Please separate plans for review by different individuals) EROSION & SEDIMENT CONTROL PLAN or PLAN AMENDMENT First Submittal Revision Additional copies only -narrative(2 copies) - narrative(2 copies) (usually after approval) -plan(2 copies) plan(2 copies) -application and fee STREAM BUFFER MITIGATION PLAN First Submittal Revision -plan(2 copies) - plan(2 copies) -application and fee iSTORMWATER MANAGEMENTBMP PLAN Conceptual Plan First Submittal Revision -plan(2 copies) - plan(2 copies) -plan(2 copies) -computations;water quality -computations;water quality, computations as revised (2 copies) hydrology,hydraulics,map(2 copies) (2 copies) -application and fee ROAD PLAN(PUBLIC OR PRIVATE) (all items, 2 copies for private roads,5 copies for public) First Submittal Revision As-built -plan -plan -plans -pavement design sheets -pavement sheets -plats -computations(&maps) -computations FINAL SITE PLAN OR AMENDMENT (First Submittals are to the Development Process Manager) Revision -plans(3 copies,incl.retaining walls if applicable) -computations as revised(2 copies) CERTIFIED ENGINEERS REPORT (addressing each performance criteria of the Zoning Ordinance) First Submission Revision -letter and documentation -plans or sketches CBR REPORTS Public Roads Private Roads -pavement design sheets -pavement design sheets (4 copies) (1 copy) TRAFFIC STUDIES Public Roads Private Roads (2 copies) (1 copy) Mar Lib Ub WW Hssociates ( 434 ) 592 6179 p. 1 WA ENGINEERS SURVEYORS PLANNERS ASSOCIATES FACSIMILE TRANSMITTAL SHEET To: Stefanie Mallory From: Amy Seipp Organization: Albemarle County Date:March 8,2005 Fax number: 434-972-4126 Total No.of pages including cover: 2 Phone number. 434-296-5832 x 3198 Project number. 204135.00 Stefanie Here is the engineering review submission form. Please let me know if you need any more information. Thank you! 4 Amy Seipp,PE Project Manager 147 Mill Ridge Road•Lynchburg,Virginia 24502 Telephone(434)582-6175•Fax(434)582-6179 Lynchburg•Charlottesville Message Page 1 of 2 From: Amy Seipp [aseipp@wwassociates.net] Sent: Friday, February 25, 2005 4:07 PM To: Glenn Brooks Subject: RE: Charlottesville Self Storage at Crozet Glenn- I don't think we'll be ready Monday. It may be later in the week that we resubmit. However, we would like to meet when we do resubmit. I will keep you posted. We're trying to make sure we cover everything. Thanks for all your help with this matter. Sincerely, Amy K. Seipp,P.E. Project Manager WW Associates 147 Mill Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct 434.582.6179 fax aseipp@wwassociates.net www.wwassociates.net Original Message From: Glenn Brooks [mailto:GBROOKS@albemarle.org] Sent: Friday, February 25, 2005 3:02 PM To: 'aseipp@wwassociates.net Cc: Patrick Leary; Bill Fritz; Amelia McCulley; Steven Snell Subject: RE: Charlottesville Self Storage at Crozet Ms. Seipp, Sorry, I have been out of the office and only received your message today. I have answered below. Shall I reserve a Monday time also? I will wait to hear from you. Glenn Brooks, P.E. Senior Engineer Albemarle County From: Amy Seipp [mailto:aseipp@wwassociates.net] Sent: Thursday, February 24, 2005 11:18 AM To: Glenn Brooks Cc: Patrick Leary Subject: Charlottesville Self Storage at Crozet Glenn - It is my understanding from Steve Snell that you are reviewing the plat for our Crozet project. I was wondering if you had any comments for the plat. Obviously there will be some changes to it as requested by Steve's comments,but I was looking for any additional comments there might be. Steve also said that you would be doing subsequent reviews for this project. Right now we are still working on addressing his comments and hope to resubmit by Monday. At that time we would like to schedule a meeting to discuss our file://C:\GEB\Eng work\Eng work 2005\Crozet Self Storage\Seipp RE Charlottesville Self S... 3/9/2005 Message Page 2 of 2 resubmittal packet and go through everything so that we have covered what you need for your review. I did have some questions for our resubmittal: 1)I contacted VDOT and they said that they had plans routed to them from Engineering. Is this the case? If so, they have requested 2 copies. I will send their comment response letter and two plans to you to be routed to them. That is fine, or you may send your copies directly to VDOT. 2)How many plan sets do you want? I am assuming 2 or 3. We will send however many sets along with calcs and a comment response letter. How many copies of the calcs will you need? I will only need 1 copy of everything for review. 2 copies will be needed for VDOT if different than those in item (1)above. At approval, 4 copies of erosion control plans and documents are needed. This will be requested when review is complete. 3) I contacted Pam Shifflett about bonding for this project. She said that there would be a bond estimate that needed to be done for SWM and E&S. Will you do this estimate or do we need to provide a cost estimate with our resubmittal? You do not need to provide a cost estimate. I will compute bond amounts using standard county spreadsheets, from the plans. Amy K. Seipp,P.E. Project Manager WW Associates 147 Mill Ridge Road Lynchburg,VA 24502 434.582.6175 main 434.582.6198 direct 434.582.6179 fax aseipp@wwassccatesnet www.wwassociates.net file://C:\GEB\Eng work\Eng work 2005\Crozet Self Storage\Seipp RE Charlottesville Self S... 3/9/2005 OF A COUNTY OF ALBEMARLE FEE-rw_- Engineering Plan Review Comments Department of Community Development AM..' M..' �^,';: Current Development Group °'1G1 Project: Charlottesville Self Storage, SDP-200400106 Plan preparer: Herb White,PE(fax not shown on plan) Owner or rep.: WW Associates,Inc. Plan received date: 5 January 2005 Date of comments: 9 February 2005 (ESC 16 February 2005) Review Engineer: Steven Snell A. Site Plan and Drainage Plan: t1. Please provide drainage computations for the proposed stormwater pipes. Include 2 year calculations for velocity and l0yr calculations for capacity. [18-32.6.6d4, DM505E1, 01M505E7, DM909.1A, DM505D] 2. lease include spread computations for the proposed ditches and drop inlets. The spread should be designed to take up no more than half the travelway it is located within. It would be best to capture the offsite drainage at the property line with a drop inlet to prevent drainage across the westernmost travel way. It would also be best to catch the drainage between the proposed storage buildings with a drop inlet before the cross the easternmost travelway. [DM909.1A, DM505C, DM505D] ✓3. The drainage along the travelway east of Building A (sheet 7)appears to flow along the eastern side of the roadway then down the existing slope to TMP 56A(3)-9 and bypass the Stormwater Basin. It seems curb and gutter is needed from the dumpster northward until sufficient grade exist to carry the stormwater to the basin. Please take care to have as much stormwater form the parking area and office building drain to the basin. ,r A: The detail for the"Wood Post"(sheet 13) shoulainclude the length of the post to be 8 feet (4"x4"x8'). This will allow the post to act similar to a VDOT Strong Post where needed along the stormwater basin. [VDOT GR-1NS Road and Bridge Standards reference 221,505] LV 5. Please include the General Construction Notes in there entirety, unabridged, on the site plan. [DM902B4] 6. A drainage easement for the outlet of the Biofilter is needed. The easement should continue from the edge of the Biofilter easement to the stream bank. [18-32.7.5.2] ( )Drainage easements for drainage from the adjacent property tl a this property will be needed. [18-32.7.5.2] �$9 The joint access easement will need to be recorded before final approval can be granted. Also a maintenance agreement will be needed for the joint access. [18-32.7.5.2] B. Stormwater management plan: A. Please include a detail of the north biofilter. Include a plan view with structures,planting layout and dimensions. And a profile view with structures, materials and elevations. [DM503.1F, VSMH3.11] Please include a planting plan for the biofilter. [DM503.2B,VSMH3.11 p.33-38] 3. Please clarify the rip rap detail for the biofilter outlet pipe. This rip rap should follow the proposed ditch centerline, rather than continue beyond the existing ditch and stopping abruptly as shown. [DM803.1C, 505C(4)] Engineering Plan Review Comments Page 2 of 3 ✓4. Please include a profile view for the stormwater basin with dimensions, structures and elevations on the stormwater management plan. Sheet 13A was submitted separately and several weeks after the original submittal and should be included with the stormwater plan. [DM909.2A(1)] I/ 5. The existing soil types shown on the soil survey are poor soil types for basin construction. Please include the following not on the plan: a. A geotechnical study of the soils to be used in constructing the embankment as well as the embankment foundation must be completed.A geotechnical engineer certification of the adequacy of the foundation and soils to be used in the embankment is required before construction begins. b. A geotechnical inspector must be present to monitor the construction of the embankment and test compaction.The minimum compacted density will be 95%with the moisture content within 2%of optimum. c. Please add the following note:The embankment must be constructed in a manner to meet all the requirements and specifications of Minimum Standard 3.01 of the Virginia Stormwater Management Handbook. d. Please submit all reports to the Community Development Department. e. Embankment slopes adjacent to detention and retention basins must be 3H:1 V or flatter(DSM,503.1.E). 6. Two different hydrology methods were used in determining pre and post development flow rates. Please use the same hydrology method for both calculations. It appears the modified rational method should work fine for both calculations. [DM503] — 7. The minimum time of concentration of 5 minutes is assumed in the basin calculations. Please calculate the time of concentration for the longest travel time to assure this is a reasonable assumption. [DM503] 8. The pond routings must show peak inflow,peak volume,peak elevation and peak outflow with a couple of adjacent iterations to show these are peaks. This would most likely include at least several lines of data rather than the two lines shown for each routing. — 9. At least two additional iterations for the direct method should be shown to verify the calculated volumes are correct. At least one lower and one higher duration storm should be used in your model to verify whether the calculated volume is a true peak. [VSMH 5-5, p5- L 27] 10. It appears drainage area B is receiving some minor off site drainage just west of Building E and Building F. Please include a drainage area map to scale with finished grading and refine drainage areas as needed. The scaled down copy of the drainage area map was to small to check for accuracy. [DM909.1A(1)] 11. An approved stormwater maintenance agreement is needed before final approval. [DM909.2B(4)] C. Erosion and sediment control plan: ,,/1. Please show the limits of disturbance on the ESC plan. V 2. Please show the dust control symbol on the plan [VESH.39] 13. Please label the ESC basins on plan. The ESC plan page#11 uses"Bio-retention area" and"Stromwater Management Facilities"as labels for the basins. Please note these basins will be converted when the site is fully stabilized. — 4. Please give basin computations with the narrative. [p. III 79-81] 0 Please show the bottom dimensions for the basins on the plans per the computations for Engineering Plan Review Comments Page 3 of 3 volume [p.III-79] 1/6. Please give detail plans of the ESC basins with elevations labeled, slopes, pipe and riser sizes, etc. [p.III-83] Please include silt fence for the southernmost portion of the site plan that is not draining to the basins. [VESCH 3.05] 178. The two diversions dikes/swales east and west of building G should be labeled DV for permanent diversion on the ESC plan. Silt fence should not be used as a diversion. [MS 4, VESCH 3.05, 3.12] V 9. It appears grading east of building G is within the"non disturb buffer". Please assure the limits of construction do not disturb the"non disturb buffer". ✓10. Please include the Albemarle County Paved wash rack detail with required note on the plan. Provide the standard note for paved wash rack details: "A minimum water tap of 1 inch must be installed with a minimum 1 inch ballcock shutoff valve supplying a wash hose with a diameter of 1.5 inches for adequate constant pressure. Wash water must be carried away from the entrance to an approved settling area to remove sediment. All sediment shall be prevented from entering storm drains, ditches or water courses." [DM Ch5 App WR-1,Policy-7] Narrative 11.Note#5 under construction sequence states that the bio-retention facilities are to be installed. These facilities should not be installed until the site is fully stabilized. I believe the basins are needed at the step. Also include a conversion of the basins near the end of the construction sequences. 12. Please include the basins in the"structure practices". 13. The narrative list soil type 81 while the soils map shows type 91. Please correct the discrepancy. 14. The application and fee for ESC was received yesterday. I will not receive the folder with the application for a few days. Rather than hold the review I will do fee verification with the next review. The limits of construction(not shown on this submittal)will be needed for fee verification. [17-209] Attachment: (none) .c " srdie 4 G - sue... ENG REVIEW CHECKLIST: Site Plan T% ,r ,p ,,: oEe Preliminary: [18-32.5.6a] Scale,and source of topography and survey [18-32.5.6d]Existing and proposed topography(5' contours),and critical slopes [18-32.5.6e] Watercourses and bodies of water [18-32.5.6g, 17-317]WPO Buffers [18-32.5.6h] Floodplain [18-32.5.6i] Existing and proposed streets(EP, CL,Rt#,name,ROW) [18-32.5.6j,k]Existing and proposed water, sewer, stormsewer, channels,and easements [18-32.5.61,DM1101] Existing and proposed utilities and easements [18-32.5.6k] Conceptual stormwater management, see Stormwater Management Plan CHECKLIST [18-32.5.6m] Existing and proposed access, entrances [18-32.5.6n]All proposed site features [18-32.5.6o]Areas to be dedicated to public use [18-32.5.6,DM601A.2] Traffic generation figures [DM_CD-15] A benchmark for topography [VDOT,DM_CD-15] Sight distances at entrances [DM1102] Easements or letter of intent to dedicate for off-site work [DM902A5] concerns with 2:1 slopes [DM902A5] concerns with 100' on-site sight distance [DM902A5, 18-32.7.2] Concerns with circulation [DM902A4, 18-32.7.3, 14-232,DM602.4]Private road request and justification where applicable [18-32.7.3, 14-512H] second entrance for 50 residential lots or more [18-32.7.3, 14-512H1,2]residential principle access free of flooding(100yr) ,or alternative access Final: V [18-32.6.1]Professional seal, signed and dated 7[18-32.6.6b]Proposed grading(2' contours) [18-32.6.6c]Water and sanitary sewer plans(Eng rev private only) f [18-32.6.6d,DM902B4, 18-32.7.4] drainage facilities and easements Drainage Plan CHECKLIST [18-32.7.5.2]All easements JOINT ACC i111/4int 4coieeEM e-NT [18-32.7.4.2]pollution control if necessary C) [18-32.7.4.3] approved erosion control plan(or< 10,000sf disturbance) • i[18-32.6.6e, 32.7.3] Street and entrance information,Road Plan CHECKLIST(where applicable) sQ [18-32.6.6g]Proposed parking and aisle dimensions,tabulation, surface types V [18-32.7.2] Safe and convenient circulation V/ [18-32.7.2.1,DM602.3,DM607B,ref. 1] VDOT entrances,upgrade or closure of existing entrances [18-32.7.2.3]Primary or alternative residential access free of flooding — [18-32.7.2.4, 32.7.3.2]Two entrances for 50 residential units [18-32.2.7]parking per 18-4.12... V [18-4.12.13b] Loading spaces not to impede parking or circulation V. [18-4.12.15a]Parking surfaced per VDOT guidelines �-[18-4.12.15b]Parking lot does not drain to street hl 4 LF ✓ [18-4.12.15c] Parking 5%max. grade V [18-4.12.15d,DM602A]Parking and travelway 100' sight distance(<20mph) n/' [18-4.12.15e] Loading and dumpsters accessible at all times b14s6 G 4-o r1v G fit.4-10 TO f- 1'1 Pv 5ftJC rt_�� • __VIEW CHECKLIST: site plan Page 2 of 2 r► [18-4.12.15f]Parking islands and traffic control [18-4.12.15g]Parking and travelway have curb, and gutter where necessary if/ [18-4.12.15h,DM602B]Parking separated from street to prevent queuing(18'min.) • [18-4.12.16a,c,DM602.1]Parking and aisle dimensions 10x18x20, 9x18x24, Il9x20x24,angled [18-4.12.16c6] overhang available,and over grass(not sidewalk)when 16' stall depth used [18-4.12.16e]Parking not over any PL,where sidewalk<6',need bumper blocks. [18-4.12.17a]Access aisle grade 10%max.,or owaiver up to priv.rd. stnd. [18-4.12.17b] Entrance landing 4%for 40' Q-' [18-4.12.17c1]Access aisle 20'min.width -- [18-4.12.16a] One-way aisle, all on-site, 12'width min,bypass lane for drive-through Q[18-4.12.18] Loading spaces 12x25, surfaced,no overhang [18-4.12.19a,b]Dumpster pad concrete, 8'+depth of dumpster,without through drainage C - —7 ,r--% [18-4.2.5]Waiver for development on critical slopes [18-4.2.6c]access,utilities, stormwater; no alternative location possible outside of critical slopes [DM605A] Guardrail over steep slope or drop-off Ad CED p e.0-4rt e [DM607B] One entrance where achievable,two where justified and site circulation off-street - [DM607B2] 50'tangent section to entrance where attainable • [DM803.1A] Slope grade 2:1 max. [DM902B]VDOT approval for plans that affect right-of-way X [DM902B4,DM:CD-10]General construction notes ref. 1:VDOT Min.Stnd.of Entrances to State Highways,p.15 C 4Q41,�`'I` ►'�u-ate F s"/d7e 4-G-6 4 ENG REVIEW CHECKLIST:Drainage Plan [DM901C] signed and dated professional seal l [DM505C(9),505D2] inlet headwaters will not flood lot improvements [DM505G6] inlet failure would not flood structures [DM505G5] inlets located away from@ ra ppaths,etc to avoid nuisances For site plans: [18-32.6.6d1]Typical sections for proposed channels,actual sections for existing [18-32.6.6d1,d2,DM909.1B(1),D] Profiles for existing and proposed pipes :. 1 [18-32.6.6d3,DM909.1B(2,4,7)] Plan view of everything, dimensioned and l , i• X. [18-32.6.6d4,DM909.1C]Drainage summary table [18-32.6.6d5] Legend of symbols [18-32.6.6d6]Notes,details, sections if not VDOT standard [18-32.6.6d7]Floodplain for 50 acres or more (further review of plans and computations are necessary only for drainage systems that will affect more than two residents/owners/lots, require easements, and be out of the public right-of-way.) For plans: [DM505G4] inlets placed such that there will be no discharge or carryover into streets [policy_2] sharp bends in channels must be avoided [DM909.1 B(1),D]Profiles for existing and proposed pipes and channels [DM909.1D(1)]existing and proposed ground [DM909.1D(2)]rim and invert elevations [DM909.1D(3)]utility crossing inverts and clearances noted [DM1101B]Drainage easements [DM1101B] correct widths 12'+2(depth-5') [DM505D11,12] 10'beyond structures,over headwater area,with access [DM909.1 ] 10'off structures,with appropriate access [DM909.1B(5)] Start and end of all ditch linings [DM909.1B(3), 505C6, 505D13] end sections(ES-1)on all culverts,and pipe outlets [DM909.1B(3), 505C7, 505D14] end walls on culverts with streams,or diameter>48" [DM909.1B(3), 505C2, 505D8] scour protection(EC-1)on all culverts [DM909.1B(6)]roll-top curbing 20' transition to inlets [DM505C5, 505D5] Min. 15"pipe diameter [DM505C5, 505D5]Access points per [VDM9.3.6] 50':12", 300':15-42", 800':48"+ [DM505D8]Min. 0.1%,max 16%pipe slope [DM505D9] step down MH rotection if flow drop>4' or 48"base, inlet shaping acceptable(IS-1) [DM505D9] safety slabs if C1 drop in manholes t—[DM505D10]anchor blocks for concrete pipe(for grades>= 16%only) [DM505D11] drop between pipe inverts for flow is 0.1' or greater [DM505D12]pipe deflection angle 90 degrees or less _ [DM803.1C, 505C(4)] Concentrated drainage piped or channeled down slopes [policy_2] discharge must be turned to the general direction of flow in the receiving channel For calculation packages: [505B,DM909.1A(3)]Hydrologic computations provided ✓ [DM909.1A(1)]Drainage area map, showing all areas with topo and coverage labels or data (If there are no drainage are maps,further review is not provided) [DM909.1A(2)]Runoff coefficients explained where necessary dL [DM909.1A(2)] Times of concentration explained where necessary,(or 5min.minimum) [policy_1] off-site areas,details and assumptions explained L RL CHECKLIST:drainage plan Page 2 of 2 (for large areas see the list for hydrology in the stormwater management checklist) [DM909.1A(7),505G] Curb and inlet computations provided [DM505G1] intensity 4in/hr for spread, 6.5 in/hr for capacity(overtopping) [DM505G3] spread<half travelway width or depth of adjacent parking space [DM505G4]no discharge or carryover into streets [DM909.1A(4), 505C]Ditch and channel computations provided [DM505C1] l0yr design for capacity [DM505C1] 2yr for velocity and erosion ®[DM909.1A(4), 505E]Pipe computations provided /.)6= C C. [DM505E1] correct l0yr design capacity, less than l0yr flow [DM505E7]velocity>3fps and< 10fps [DM505,909.1] Hydraulic grade line where capacity or surcharge a concern [DM909.1A(5),505D]Culvert and pipe inlet computations provided u&-moos CS [DM505C2, 505D2]HW 1.5' below shoulder,HW<1.5(Dia.) [DM505D3] 3fps min.velocity [DM505D4]buoyancy comps where excessive headwater expected policy_l: drainage from off-site area should be clearly called out. Developed conditions should be assumed,unless justified otherwise. policy_2: to prevent erosion in the long term, and to keep the flow in the channel. C ivi GC C STU24 GE 4J (40 2 cT ENG REVIEW CHECKLIST: Stormwater Management Plan Concept plan or overall points: [17-316]payment to regional stormwater management facility(for quantity_,quality ) [17-312F4] exemption granted for less than 1 acre project(flood control,water quantity) [17-314C,F6]waiver granted per study(note study),or adjacent to floodplain(flood control) [17-312G] other exemption approved by County Engineer(flood control) [17-314D,DM503B] added measures to protect downstream properties(lyr discharge r t) X [17-312C, 315A] capture as much project area as possible - [17-312B, 18-30.3] Special Use Permit for fill in the floodplain, if applicable) �, — [17-312E]preserves natural channel character as much as possible [DM503.1A] facilities a safe distance from home sites, and off lots[DM903A5(4)] — [DM503.1B] VDOT approval if affecting ROW X [DM503.3A,VSMH]BMP has required elements(forebays,wetlands,plantings,etc.) [17-315B,C]meets prelim.removal rate requirement of (attach computation) )( bs.s7vm@s aufFFe Final plans [17-303, 17-312,DM909.2, 503B] [17-317,DM504] stream buffers on plan,undisturbed [17-317,DM504,#1 stream buffer disturbance approved,mitigation plan CHECKLIST [17-303.B&C] State and Federal permits [DM 909.2A(1)] facilities plan,details(profile), dimensioned and labeled. [DM 909.2B(2), 503.1C, 1101] easements shown [DM 909.2A(3), 503.1D]inspection and maintenance access [DM503.1D(1)] 10' wide [DM503.1D(2)]<=20%grade, gravel surface over 10% [DM503.1D(3)] within easement [DM 909.2B(4)] agreement completed, signed,paid,approved Facility specific plan requirements: Basins: [DM503.1E, 805.1A,C] [DM909.2A,VSMH3.01]details,notes for dams: 3:1 slopes,benches,min.top width [DM909.2A(6),503.1E,503.1G(1)] 0.5%min.positive drianage(dry basins,underground) [DM909.2A(7)] safety ledges(retention) [DM909.2B(8), 503.1G(6)] emergency spillway or overflow provision [DM503.1E,VSMH] trash racks and anti-vortex device [DM503.1E] 15"min.pipe diameter [DM503.1 E]not over utilities or easements [DM503.1E] guardrail or fencing if necessary [DM503.1 E] low-level drain valve(retention) [VSMH MS3.05]Planting plan for shelves,wetlands [] Underground facility: [DM503.1 G(2)] access at each end,<200' apart [DM503.1G(3)] corrosion protection for metals [DM503.1 G(4)] steps for access [DM503.1G(5)]bedding and compaction spec [DM503.1G(7)] sealed joints Bio-filters: [DM503.1F,VSMH3.11] [DM503.1F1]WQV 0.5"over impervious captured(biofilter criteria)for 50%removal, 1" for 65% [DM503.1 F2]discharges into facility have energy dissipators, scour protection [DM503.1F3] 4"drop with scour protection for curb inlets,evenly spaced to capture lot REVIEW CHECKLIST: stormwater management plan Page 2 of 2 [DM503.1F4] 6-12"crest, and 10 year pass-through [DM503.1F5] soil mix [DM503.1F6] details and sections, elevations for curb inflow embankment under-drains structure inverts soil mix [DM503.1F8,9,VSMH3.11 p.33-38]planting plan [DM503.1F8(a)]3 shrubs or tree species min. [DM503.1F8(b)]native grass spec [VSMH 3.11] 10 trees/shrubs(3:1 or 2:1 ratio)per 1000sf filter area(approx.) [DM909.2A(9)]underdrains with cleanouts [DM503.1F10&11] inspection note on plan Computations: [17-303B, 17-314E,DM909.2A, 805.1C] [17-312D]reflect ultimate buildout conditions [DM503.2A]Hydrology [DM503.2A1] rational limit tc=20min.,area<20acres [DM503.2A4] sheet flow< 150' [DM503.2A5] methods follow VSMH Chapter 4 [DM503.2B]Hydraulics(routings) [DM503.2B1] rational method uses peak storage hydrograph per VSMH Chapter 5 [DM503.2B2,3]tailwater and headwater conditions properly modeled [17-314A] l0yr storm peak rate does not increase [17-314B] 2yr storm peak rate does not increase [??] 100yr storm to check dam does not overtop [DM503.2C]BMP performance(water quality) [17-315B,C]meets removal rate requirement of (as prelim., or attach computation) [DM503.1F1,VSMH] meets WQV, or permanent pool criteria [17-310] Application fee paid bond amount for plats [14-413] according to latest cost figures To do: 1. develop a process for approval of buffer disturbance, or kick back 2. develop a better BMP selection process 3. define required elements for each selection 4. include process and check items for non-structural measures 5. develop a kick back procedure to David or Jack for non-checklist-item BMP's ref. 1:VDOT Sub.Str.Req.24 VAC 30-90-380 Table 1 PpL, G� Trams CNg21-c7T�sv 14-c:r;' N( s�cr- ZgGE 4- r= ENG REVIEW CHECKLIST: Stormwater Management Plan Overall and concept plans[required per 17-303,DM503A]: [17-310]Application fee paid [17-312F4] exemption granted for less than 1 acre project(flood control,water quantity) [17-314C]modification granted per study(note study) [17-314F6] demonstrated in writing that no detention is better, safer, and will not affect downstre.;: properties [17-312G] other exemption requested in writing and approved by Program sty �f` "' :ntr: ) ,�17-314D,DM503B] added measures to protect downstream properties(ly3 i i:- eme t, d [17-312C, 315A]capture as much project area as possible(including roofdrains on site plans [17-312B, 18-30.3] Special Use Permit for fill in the floodplain,if applicable [17-312E]preserves natural channel character as much as possible ./ [DM503.1A] facilities are a safe distance from home sites, and off lots [DM903A5(4)] [DM503.1B]VDOT approval if affecting ROW [DM503.3A,VSMH]BMP has required elements for RR(forebays,wetlands,plantings,etc.) O [17-315B,C]meets prelim.removal rate requirement of (attach computation)in each project drainage area t/ [17-317,DM504] stream buffers on plan,undisturbed [17-320, 17-321,DM504] stream buffer disturbance justified and approved [policy_3]plans and computations for existing facilities must use as-built data (If the above items are not satisfactorily addressed, no further review is provided. It is expected that these overall points must be in place before final details can be resolved.) Final plans [17-303, 17-312,DM909.2, 503B] ✓ [DM503.2C]BMP performance requirement met by facility characteristics per VSMH l [17-317,DM504] stream buffers on plan [17-320, 17-321,DM504]stream buffer disturbances approved,in accord with preliminary plans [17-320B] if exempt,disturbance minimised to protect stream [17-321.5] if driveway,necessary for reasonable use of lot [17-321.2] in development area, landward 50'with mitigation plan [17-303.B&C] State and Federal permit copies provided [DM 909.2A(1)] facilities plan view [DM 909.2A(1)] details(profile),dimensioned and labeled,with structures,elevations,grades b [DM 909.2B(2), 503.1C, 1101] easements shown,located,dimensioned [DM 909.2A(3), 503.1D]inspection and maintenance access [DM503.1 D(1)] 10' wide [DM503.1D(2)]<=20%grade,gravel surface over 10% [DM503.1D(3)]within easement b( [DM 909.2B(4)]agreement completed, signed,paid,approved Facility specific plan requirements: Basins: [DM503.1E, 805.1A,C] t( [DM909.2A,VSMH3.01]details,and notes for dams: 3:1 side slopes maximum safety benches on steep slopes min.top width per VSMH _compaction notes [DM909.2A(6),503.1E, 503.1G(1)] 0.5%min.positive drainage(dry basins,underground) [DM909.2A(7)] safety ledges or wetland benches(retention) III REVIEW CHECKI.#stormwater management plan Page 2 of 2 [VSMH]minimum pool dimensions and volume met(retention) [DM909.2B(8), 503.1G(6),VSMH3.01] emergency spillway,overflow provision,or min. freeboard 2'if primary spillway used [DM503.1E,VSMH]trash racks and anti-vortex device on all orifices,weirs,and riser tops [DM503.1E] 15"min.pipe diameter [DM503.1E]not over utilities or easements / [DM503.1E] guardrail or fencing if necessary for safety [DM503.1E] low-level drain valve(retention) [VSMH MS3.05]planting plan for shelves,wetlands(see list for biofilters below) [MS-19,VESCH] size all outlet protection(EC-1)stone,and dimension apron per E&S min. stnd. Underground facility(in addition to basins list above): [DM503.1G(2)] access at each end,<200' apart [DM503.1G(3)] corrosion protection for metals [DM503.1 G(4)] steps for access(to dry side) [DM503.1G(5)]bedding and compaction spec [DM503.1G(7)] sealed joints [policy_1]possible to unclog orifice from a dry side [policy_2]design storms enter facility,do not bypass inlets or overtop curb :io-filters in addition to basins list above): [DM503.1F,VSMH3.11] P 503.1F1]WQV 0.5"over impervious captured(biofilter criteria)for 50%removal, 1"for 65% [VSMH] meets area requirement of 2.5-5%of area of impervious cover [DM503.1F2]discharges into facility have energy dissipaters, scour protection [DM503.1F3]4"drop with scour protection for curb inlets,evenly spaced to capture lot -r 10) C,[DM503.1F5] soil[DM503.1F4] 'mix specified year crest,and 10 pass-through �T�F,D - D E ' K [DM503.1 F6] details and sections,elevations for R E q ' E curb inflow P embankment under-drains structure inverts soil mix K. [DM503.1F8,9,VSMH3.11 p.33-38]planting plan [DM503.1F8(a)]3 shrubs or tree species min. [DM503.1F8(b)]native grass spec [VSMH 3.11] 10 trees/shrubs(3:1 or 2:1 ratio)per 1000sf filter area(approx.) 6[DM909.2A(9)]underdrains with cleanouts [DM503.1F10&11] inspection note on plan Computations: [17-303B, 17-314E,DM909.2A, 805.1C] [17-312D]reflect ultimate buildout conditions 14. [DM503.2A] Hydrology (frpm Drainage Plan checklist) ✓ [DM909.1A(1)]Drainage area map, showing all areas with topo and coverage labels or data K [DM909.1A(2)]Runoff coefficients explained where used in comp.,with references ti [DM909.1A(2)]Times of concentration explained where necessary,(or 5min. min.used) [policy_4]off-site areas,details and assumptions explained (from DM503.2A) [policy_2] large facilities and drainage areas should use at least two methods for verification of peak flow;rational, SCS,Anderson,regression equations,etc. REVIEW CHECKL stormwater management plan Page 2 of 2 [DM503.2A1]rational limit tc=20min., area<20acres [DM503.2A4] sheet flow< 150' [DM503.2A5] methods follow VSMH Chapter 4 [D 3.2B]Hydraulics(routings) [DM503.2B1]rational method also uses peak storage hydrograph per VSMH Chapter 5 [DM503.2B2,3]tailwater and headwater conditions properly modeled [17-314A] l0yr storm peak rate does not increase -- [17-314B]2yr storm peak rate does not increase [VSMH] 100yr storm run to check that dam does not overtop [17-315B,C]meets removal rate requirement of (as prelim.,or attach computation) Before approval: [17-316]payment to regional stormwater management facility(for quantity_,quality ) [14-413]bond amount for plats according to latest cost figures Policy_l: this applies mainly to underground facilities. If an orifice clogs,and the facility fills up,it should be maintainable without diving. Policy_2: this applies mainly to underground facilities,where inlet systems are not typically designed to carry l0yr flows. Policy_3: As-built conditions tend to change significantly from design in Albemarle Couny, so computations based on old design data tend to be inaccurate. Therefore,existing facility analysis and modification must use current field data. Policy_4:this is important for accounting purposes on regional or shared facilities. The county file becomes the record of what properties have met the requirements of the ordinances,in whole,or in part. N C r-1 9-Q II/ d S�F sue. 4 ENG REVIEW CHECKLIST:Erosion Control Plan O Ih[DM907C] all stages of construction are protected,and construction does tket m ctiv measures e it 9 SC f 1 , _ (If the site is not protected from the initial disturbance of the ground, to the time final grades e established and stabilized, no further review is provided. For example, if only inlet protection 's shown, or only final contours are considered, initial grading is not protected.) [17-204E] site plan or plat approved Narrative: [] [VESCH VII-6,App.7A-2, p.VI-13] All items on state CHECKLIST completed satisfactorily Plans [17-203,DM907,501] [VESCH VII-6,App.7A-2,p.VI-13]All items on state CHECKLIST completed satisfactorily uo r/L4 [VESCH Table VI-15] general erosion and sediment control construction notes on plan,verbatim [VESH3.39] dust control symbol shown on plan X [policy_7,DM Ch5 App WR-1]paved wash rack detail and required note(see below)on plan [policy_5] for subdivisions,required note(see below)regarding lots on plan [DM907D]protected areas(incl. critical slopes)and buffers per stormwater,mitigation,site,or subdivision plans [18-21.7.3,26-10.3, 32.7.9.8] 20' commercial ,or 30' industrial zone buffer if appl. (waste areas) [18-30.3.3.2] fill or change in floodplain SP approved(waste areas) [18-5.1.28]zoning approval for fill>10,000sf(waste areas) [18-10.2.1,2] SP approval for cut>50,000cy in RA zoning(borrow areas) [18-4.3]no tree cutting unless RA,or site plan approved(waste areas) [18-30.4.2.1, 30.4.3, 10.2.1.18, 10.2.2.40] zoning approval in Nat.Res. Extraction Overlay District Facility specific plan requirements: [policy_1]Use standard details from VESCH,or references only,no re-drafted details [policy_2]proposed(temporary or permanent)contours must be shown for traps and basins Traps: [VESCH3.13 p.III-71] less than 3 acres of drainage 9 or H 7 3 A c 2 G .r computations provided with narrative trap volume; 134 cy of storage per acre,half wet weir length; 6'per acre minimum bottom,dimensions, slopes noted on plans per computations for volume detail or schematic on plan with elevations labeled, slopes,weir length,etc. [DM501D2] dry trap modification requested in writing with justification,and approved Basins: [VESCH3.14 p.III-77] [policy_3]basins structures and embankments should match permanent stormwater structures if conversion will occur e'v E D Pl A4 S7if"A✓ S 0 A) PVi—/ti b( computations provided with narrative flow and hydrology for spillway designs(p.III-80&81) basin volume; 134 cy of storage per acre,half wet(p.III-79) riser and barrel comp for 2yr storm(p.HI-81) emergency spillway channel comp, or 25yr storm riser design(p.III-81) 1'high water to top of dam with emergency spillway,or 2' without(p.III-81) floatation comps for risers taller than 10' (p.III-82) dewatering orifice sized(App.3.14-a) 4—minimum bottom dimensions on plans per computations for volume(p.III-79) riser base provided(pill-82& 110) . REVIE'. . --3CKLIST:erosion control plan Page 2 of 2 Ianti-vortex and trash rack provided(p.III-81) Y.. detail(p.III-83)on plan with elevations labeled, slopes,pipe and riser sizes,etc. Zeembankment dimensioned<10'high: 6 top,2:1 sides, or> 10' high: 8' top,2.5:1 sides(p.III-80) scour protection at outlet(p.III-82) length to effective width ratio 2:1 or better,effective width=pool area/flow path(p.III-79) [VESCH 3.01] safety fence and signs [DM501D1] dry silt basin riser modification requested in writing with justification,and approved Silt Fence: [VESCH 3.05] •X less than 100' slope length behind fence(p.III-20) N&D u / FA 0 N7- r/ sheet and rill flow only,no concentrated flow>l cfs,or l acre total(p.III-20) ti not used as diversion FINAL CHECK of minimum standards addressed on plan or in narrative: t/ [MS 1]temporary stabilization [MS 2] stockpiles protected [MS 3]permanent ve.a . ..l K, [MS 4]trapping an. d' ersion A,C� C easures installed first 1)V 6 [MS 5] earthen structures stabilized (s( [MS 6] traps and basins sized for total areas [MS 7] slopes minimum erosion [MS 8] concentrated runoff not over slopes [MS 9] slope seeps protected /'-/[MS 10] inlet protected v [MS 11]outlets stabilized /'[MS 12]watercourses protected,encroachment minimized [MS 13] stream crossings provided [MS 14] federal,state, local regulations met [MS 15]watercourse bed and banks stabilized [MS 16]utility line construction follows a-f Y [MS 17]minimize tracking of mud on roads, clean up daily [MS 18]all temporary measures removed [MS 19]downstream properties protected Items to be completed before approval: [VESCH VII-6] site inspection conducted on [17-204]bond amount according to latest cost figures X [17-209]Verify fee,or request correction: Disturbed acres and appl. fee$320+$125/acre policy_l: Except for basins and traps,which need to show elevations and dimensions;to avoid overlong review times, standard details should not be part of plans. There is no need to attach them to the plans, as all projects will have an RLD on-site with knowledge of the specifications. Reviewers should not have to check standard details to ensure nothing has been changed. If designers feel they must include these standard details with plans,they should be added after approval,and not be part of the approved plan set. policy_2: To ensure constructability,and to verify dimensions and outlet placement,grading should be provided. Waivers of this policy should be requested in writing only if it is glaringly obvious that plenty of room exists and an adequate facility can be built without difficulty. REVIEV. .._�:CKLIST:erosion control plan Page 2 of 2 policy_3: The same structures should be used(with slight modification)to avoid sediment discharge when a riser is replaced. This also makes for easier conversion and inspection. policy_5: • ' ovi•e the standard note: "The developer shall reserve the right to install,maintain,remove and/or convert to permanent stormwater management facilities(where applicable)all erosion control measures required by this plan regardless of the sale of any lot." polic 7: Provide the standard note for paved wash rack details: "A minimum water tap of 1 inch must be installed with a minimum 1 inch ballcock shutoff valve supplying a wash hose with a diameter of 1.5 inches for adequate constant pressure. Wash water must be carried away from the entrance to an approved settling area to remove sediment. All sediment shall be prevented from entering storm drains, ditches or water courses." APPLICATION INFORMATION Application # WP0200500012 All Applications: ARB200400112 Project Name Charlottesville Self Storage @ Application Type Water Protection Ordinances !ARB200400132 Tax Map Parcel 056A2-01-00-05800 J SDP200400106 ARB200400159 'ARB200500006 OTH200500029 1WP0200500012 REVIEWS Add Planning Review >> Review Coordinator Entered By:Carla Harris on 02/161E005 04 ^.Pe,IChT10 63 rt Reviewer ID Submittal Type Group or Agency Status Received Due Completed f6 /QCC 6 4* Glenn Brooks Stormwater Managem Engineer Z&CD Pending (Glenn Brooks Erosion Control Plan !Engineer Z&CD Pending ! [Glenn Brooks Stormwater Managemr Engineer Z&CD Pending I C [ I I [ Comments Document(double-click in green field to upload your comments) Comments: The box below is meant for short comments. Date Sent Ace COUNTY OF ALBEMARLE Engineering Plan Review Comments Department of Community Development Current Development Group °iactro Project: Charlottesville Self Storage, SDP-200400106 Plan preparer: Herb White,PE(fax not shown on plan) Owner or rep.: WW Associates,Inc. Plan received date: 5 January 2005 Date of comments: 9 February 2005 Review Engineer: Steven Snell A. Site Plan and Drainage Plan: 1. Please provide drainage computations for the proposed stormwater pipes. Include 2 year calculations for velocity and l0yr calculations for capacity. [18-32.6.6d4, DM505E1, DM505E7,DM909.1A, DM505D] 2. Please include spread computations for the proposed ditches and drop inlets. The spread should be designed to take up no more than half the travelway it is located within. It would be best to capture the offsite drainage at the property line with a drop inlet to prevent drainage across the westernmost travel way. It would also be best to catch the drainage between the proposed storage buildings with a drop inlet before the cross the easternmost travelway. [DM909.1A, DM505C, DM505D] 3. The drainage along the travelway east of Building A (sheet 7)appears to flow along the eastern side of the roadway then down the existing slope to TMP 56A(3)-9 and bypass the Stormwater Basin. It seems curb and gutter is needed from the dumpster northward until sufficient grade exist to carry the stormwater to the basin. Please take care to have as much stormwater form the parking area and office building drain to the basin. 4. The detail for the "Wood Post" (sheet 13) should include the length of the post to be 8 feet (4"x4"x8'). This will allow the post to act similar to a VDOT Strong Post where needed along the stormwater basin. [VDOT GR-INS Road and Bridge Standards reference 221,505] 5. Please include the General Construction Notes in there entirety, unabridged, on the site plan. [DM902B4] 6. A drainage easement for the outlet of the Biofilter is needed. The easement should continue from the edge of the Biofilter easement to the stream bank. [18-32.7.5.2] 7. Drainage easements for drainage from the adjacent property threw this property will be needed. [18-32.7.5.2] 8. The joint access easement will need to be recorded before final approval can be granted. Also a maintenance agreement will be needed for the joint access. [18-32.7.5.2] B. Stormwater management plan: 1. Please include allirf the north. Include a plan view with structures,planting layout and dimensions. And a profile view with structures, materials and elevations. [DM503.1F,VSMH3.111 2. Please include aIplanting plan for thee. [DM503.2B, VSMH3.11 p.33-38] 3. Please clarify the rip rap detail for the biofilter outlet pipe. This rip rap should follow the proposed ditch centerline, rather than continue beyond the existing ditch and stopping abruptly as shown. [DM803.1C, 505C(4)] E_a_eering Plan Review Comments Page 2 of 2 a.tc , Please include a profile view for the stormwater basin with dimensionsT�structures FAA I.."y ow elevations on the stormwater management plan. [DM909.2A(1)] - `p My 4 SaE6.7 134 ,vve060 5. The existing soil types shown on the soil survey are poor soil types troll basin construction. °'•dtiA�+''"C1 Pc Please include the following not on the plan: ND s sIEAE s,VEET a. A geotechnical study of the soils to be used in constructing the embankment as well as the embankment foundation must be completed.A geotechnical engineer certification of the adequacy of the foundation and soils to be used in the embankment is required before construction begins. b. A geotechnical inspector must be present to monitor the construction of the embankment and test compaction.The minimum compacted density will be 95%with the moisture content within 2%of optimum. c. Please add the following note:The embankment must be constructed in a manner to meet all the requirements and specifications of Minimum Standard 3.01 of the Virginia Stormwater Management Handbook. d. Please submit all reports to the Community Development Department. e. Embankment slopes adjacent to detention and retention basins must be 3H:1 V or flatter(DSM,503.1.E). 6. Two different hydrology methods were used in determining pre and post development flow rates. Please use the same hydrology method for both calculations. It appears the modified rational method should work fine for both calculations. [DM503] 7. The minimum time of concentration of 5 minutes is assumed in the basin calculations. Please calculate the time of concentration for the longest travel time to assure this is a reasonable assumption. [DM503] 8. The pond routings must show peak inflow, peak volume,peak elevation and peak outflow with a couple of adjacent iterations to show these are peaks. This would most likely include at least several lines of data rather than the two lines shown for each routing. 9. At least two additional iterations for the direct method should be shown to verify the calculated volumes are correct. At least one lower and one higher duration storm should be used in your model to verify whether the calculated volume is a true peak. [VSMH 5-5,p5- 27] 10. It appears drainage area B is receiving some minor off site drainage just west of Building E and Building F. Please include a drainage area map to scale with finished grading and refine drainage areas as needed. The scaled down copy of the drainage area map was to small to check for accuracy. [DM909.1A(1)] 11. An approved stormwater maintenance agreement is needed before final approval. [DM909.2B(4)] C. Erosion and sediment control plan: To follow Attachment: (none) WW- ENGINEERS iirffi SURVEYORS PLANNERS ASSOCIATES TRANSMITTAL To: /=/L 47V c..r S /✓1 q c 6,4[_L__ Date: I /6-jos- Project.No.: Z o¢/3 S, o v Project: G}j 4I24...0 ITE-5 c/Sc-L r s EL--G STO2 44" 0 C/Zo a,E-/- Number Spec. Section/ Description Copies Drawing No. 2 SHftTS /3 4- oA / c Z- DlZ 4-I4/ .9-r. ( S G✓A/ C9-LcyL-9-7-Z*0 evS WW Associates By: poi-v. > /4 ,TE N5b't C D s+qwT, f ,v rro et/5 t PP 4-T- !' -D1).C7Z'0 4J# S l v Al D.'/4 '- , , Foe t N4 act/z )2.5 v_r . r-✓,r,t/6, S L✓f'! Ei 1)4.14""1.4-0.4E- cc: w/ copies of referenced data w/ copies of referenced data RECEOVEr BAN 05 2005 1402 Greenbrier Place•Charlottesville,Virginia 22901 Telephone(434)984-2700•Fax(434)978-1444 Lynchburg•Charlottesville :04OMMUNITy D VELOPMEN, SDP-2004-106 Charlottesville " if Storage @ Crozet, Final Site Plan - "---te 240 Page 1 of 1 Steven Snell From: Kesterson, Jimmy [Jimmy.Kesterson@VDOT.Virginia.gov] Sent: Thursday, December 23, 2004 8:29 AM To: Steve Snell (E-mail) Cc: Francis Maccall (E-mail) Subject: SDP-2004-106 Charlottesville Self Storage @ Crozet, Final Site PI an - Route 240 Steve, A typical section for the frontage improvements should be added to the plan along with the pavement design. The pavement will need to consist of 6"#21A, 4 1/2" BM-25 and 1 1/2" SM-9.5A. The proposed 8"waterline connection as shown on sheet 9 of 16 will require a boring of route 240 and will need to be shown as a bore. If there is sufficient evidence that existing utilities prohibit a bore, consideration may be given for open cutting. However the pavement restoration will require a patch in accordance with Special provision MP-71 and the area adjacent to the patch must be milled 25' in each direction and overlaid with 1 1/2"of SM-9.5A. Under the ROADWAY CONSTRUCTION NOTES, # 11 should be revised to indicate TRUNCATED DOME rather than exposed aggregate. Please have the plan revised to address the above comments prior to final approval. Jim Kesterson 12/27/2004