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HomeMy WebLinkAboutWPO201700014 Stop Work Order 2021-05-03 VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY ' GENERAL VPDES PERMIT FOR DISCHARGES OF STORMWATER FROM CONSTRUCTION ACTIVITIES(VAR10) NOTICE OF TERMINATION 2019 Permit Coverage Number(VAR10####). VAR10L472 Section I. Operator/Permittee Information.The person or entity that has active permit coverage approval and operational control over construction activities to ensure compliance with the general permit. A person with signatory authority for this operator must sign the certification in Section VII(per Part III.K.of the VAR10 Permit) Construction Activity Hourigan Construction Operator Name: Contact Person: Brad Hulse 411 E. Franklin St Suite 400 Address: Richmond, VA 23219 City,State,Zip Code: 804-282-5300 Phone Number: Brad.Hulse@hourigan.group Primary Email: CC Email. chris.lomaka@hourigan.group, mike.castle@hourigan.group Section II. Construction Activity Location Information. Project site information. Construction Activity Name: Town Center Four- New Building Construction Address: 994 Research Park Boulevard City and/or County and Zip Code: Charlottesville, VA 22911 Latitude and Longitude (6-digit,decimal degrees format) Section III. Reason for Terminating Coverage under the General Permit. The operator shall submit a Notice of Termination within 30 days after meeting one or more of the following conditions(select one or more): KI A.Necessary permanent control measures included in the SWPPP for the site are in place and functioning effectively and final stabilization has been achieved on all portions of the site for which the operator is responsible.When applicable,long-term responsibility and maintenance requirements for permanent control measures shall be recorded in the local land records prior to the submission of a Notice of Termination; ❑ B.Another operator has assumed control over all areas of the site that have not been finally stabilized and obtained coverage for the ongoing discharge; ❑ C.Coverage under an alternative VPDES or state permit has been obtained;or ❑ D.For residential construction only,temporary soil stabilization has been completed,the operator has provided written notification to the homeowner about the importance of final stabilization and incorporating a copy of the notification and signed certification statement into the SWPPP,and the residence has been transferred to the homeowner Rev 04/2019 PAGE 1 16 CONSTRUCTION GENERAL PERMIT(VAR10)NOTICE OF TERMINATION 2019 Section IV.Participation in a Regional Stormwater Management Plan. If your site discharges to a regional stormwater management facility,provide information related to the regional stormwater management plan.Attach a separate list if discharging to multiple regional facilities. Regional Stormwater Management Stormwater Wet Pond Facility Type: Address: TMP 32-6R,Facility ID:0465.01 Albemarle County,Virginia,22911 City and/or County and Zip Code: Latitude and Longitude 38.1464,-78.4359 (6-digit,decimal degrees format). Total Acres Treated by Regional Facility 450.69 acres (report to one-hundredth of an acre). Impervious Acres Treated by Regional Facility 80.15 acres. (report to one-hundredth of an acre): Section V.Perpetual Nutrient Credits. If your site is utilizing nutrient credits,provide information related to the perpetual nutrient credits that were acquired in accordance.with§62.1-44.15:35 of the Code of Virginia.Attach a separate list if needed. Nonpoint Nutrient Credit Generating Entity n/a (Bank Name). Perpetual Nutrient Credits Acquired (pounds/acres/year). Include the affidavit of sale for all nutrient credits acquired. Is the affidavit of sale of nutrient credits attached? DYES ❑NO Section VI. Permanent Control Measures. If applicable,list the post-development stormwater management facilities or best management practices(BMPs)that were constructed and installed as part of this activity to comply with the stormwater management technical criteria(structural and nonstructural,on-site and off-site).Attach a separate list if needed. If you have permanent control measures,the following items are required to be included with this form in order to complete your Notice of Termination submittal ®A. Engineer's Certification Statement ❑ B. As-built plans(construction record drawings)—digital ❑ C. As-built plans(construction record drawings),—full-sized,paper ® D. Stormwater Management Plans—digital ❑ E. BMP Maintenance Agreement—notarized original,for public and private projects under DEQ's VSMP Authority Stormwater Management Facility Types(please choose from the following bmp types): Bioretention 1 Extended detention-enhanced Other IIC(manufactured Soil Amendments Bioretention 2 Filtering Practice 1 treatment device,etc.) Urban Bioretention Bioretention basin Filtering Practice 2 Permeable Pavement 1 Vegetated filter strip Bioretention filter Grass Channel Permeable Pavement 2 Vegetated Roof 1 Constructed Wetland 1 Grassed swale Rainwater Harvesting Vegetated Roof 2 Constructed Wetland 2 Infiltration(1 x WQ Vol) Retention basin I(3 x WQ Vol) Wet Pond 1 Constructed wetlands Infiltration(2 x WQ Vol) Retention basin II(4 x WQ Vol) Wet Pond 2 Dry Swale 1 Infiltration 1 Retention basin III(4 x WQ Vol Wet Swale 1 Dry Swale 2 Infiltration 2 with aquatic bench) Wet Swale 2 Extended detention(2 x WQ Vol) Other IIB(manufactured Sand filter Extended Detention Pond 1 treatment device,etc.) Sheetflow to Vegetated Filter or Extended Detention Pond 2 Conserved Open Space 2 Rev 04/2019 PAGE 2 16 CONSTRUCTION GENERAL PERMIT(VAR10) NOTICE OF TERMINATION 2019 Stormwater Management Facility#1 BMP Type: Date BMP Became Functional. Address(if available) City and/or County and Zip Code: Latitude and Longitude • (6-digit,decimal degrees format): Receiving Water(s) (outfall discharge): Total Acres Treated (report to one-hundredth of an acre): Impervious Acres Treated (report to one-hundredth of an acre): Stormwater Management Facility#2 BMP Type: Date BMP Became Functional: Address(if available) City and/or County and Zip Code: Latitude and Longitude (6-digit,decimal degrees format): Receiving Water(s) (outfall discharge) Total Acres Treated , , (report to one-hundredth of an acre): Impervious Acres Treated (report to one-hundredth of an acre): Stormwater Management Facility#3 BMP Type: Date BMP Became Functional: Address(if available): City and/or County and Zip Code: Latitude and Longitude (6-digit,decimal degrees format): Receiving Water(s) (outfall discharge). Total Acres Treated (report to one-hundredth of an acre): Impervious Acres Treated (report to one-hundredth of an acre): Rev 04/2019 PAGE 3 16 CONSTRUCTION GENERAL PERMIT(VAR10) NOTICE OF TERMINATION 2019 Section VII. Certification. This Certification must be signed by a person representing the operator identified in Section I.and meeting the requirements of 9VAC25-880-70 Part III K. Certification "I certify under penalty of law that I have read and understand this Notice Of Termination and that this document and all attachments were prepared in accordance with a system designed to,assure that qualified personnel properly gathered and evaluated the information submitted.Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering.the information,the information submitted is to the best of my knowledge and belief true, accurate,and complete.I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonment for knowing violations." .Brad H Ise a(icr_____ Printed Name: Signature(signed in ink). Date: 03- Section VIII.•Submittal Instructions. Please submit this form to the Virginia StormWater Management Program(.VSMP)Authority that has jurisdiction for your construction activity: If the locality'is"the VSMP Authority;'please submit your form directly to the 'locality;do NOT send this:form to DEO: A list of local VSMP Authoritiesis available here: VSMP Authorities. If DEQ is the'VSMP Authority,please send to: If the locality is the VSMP Authoritv,'please send to: Department of'EnvironmentalQuality The Local VSMP Authority(insert address b elow) 'Office of Stormwater•Managemerit•Suite,1400. PO Box 1105 .Richmond VA 23218 constructionep@daq:virginia.gov Permit terminations maybe delayed if there are outstanding annual permit maintenance fee balances due. Rev 04/2019 PAGE 4 16 CONSTRUCTION GENERAL PERMIT(VAR10) NOTICE OF TERMINATION 2019 INSTRUCTIONS PLEASE DO NOT PRINT OR SUBMIT A complete and accurate Notice of Termination is required for terminating coverage under the General VPDES Permit for Discharges of Stormwater from Construction Activities. Termination shall become effective upon notification from the department that the provisions of termination have been met or 60 days after submittal of a complete and accurate Notice of Termination,whichever occurs first. Authorization to discharge terminates at midnight on the date that the Notice of Termination is submitted unless otherwise notified by the VSMP authority or the department. Permit Coverage Number.Include your existing,active permit coverage number. Example:VAR10####. Section I. Operator/Permittee Information. The construction activity operator(permittee). The permittee with active permit coverage and that has operational control over the construction activities to ensure compliance with the general permit. For companies,use the complete,active,legal entity name as registered with a state corporation commission. Entities that are considered operators-commonly consist of the property owner,developer of a project(the party with control of project plans and specifications),or general contractor(the party with day-to-day operational control of the activities at the project site that are necessary to ensure compliance with the general permit). If an individual person is named as the operator,that person(or a representative of)must sign the certification in Section VII. Section II. Construction Activity Location Information. Project site information. Complete this section with the same information as listed on the current registration statement. A list of active permits and corresponding location information is available on our website. Section III. Reason for Terminating Coverage under the General Permit. The operator shall submit the Notice of Termination no later than 30 days after one or more of the termination conditions being met.Authorization to discharge terminates at midnight on the date that the Notice of Termination is submitted to the VSMP Authority,unless otherwise notified by the VSMP authority or the Department.Termination of authorizations to discharge for the conditions shall,be effective upon notification from the Department that the provisions of termination have been met or 60 days after submittal of the Notice of Terminations,whichever occurs first. The operator of the construction activity shall submit a Notice of Termination within 30 days after meeting one or more of the following conditions(you may select one or more of these conditions): • [A] Necessary permanent control measures included in the SWPPP for the site are in place and functioning effectively and final stabilization has been achieved on all portions of the site for which the operator is responsible has operational control.When applicable,long-term responsibility and maintenance requirements for permanent control measures shall be recorded in the local land records prior to the submission of a.complete and accurate Notice of Termination; • [B]Another operator has assumed control over all areas of the site that have not been finally stabilized and obtained coverage for the ongoing discharge; • [C]Coverage under an alternative VPDES or state permit has been obtained;or • [D] For individual lots in residential construction only,temporary soil final stabilization as defined in 9VAC25-880-1,has been completed and the residence has been transferred to the homeowner. Section IV.Participation in a Regional Stormwater Management Plan. Where applicable,include information for each regional stormwater management facility to which this site contributes. If your site is contributing to more than one regional facility,please include the information for each facility in a separate list. The following information shall be included for each regional stormwater management facility installed: • the type stormwater management facility(see the list of facility types on page 2 of the Notice of Termination); • the physical location of the facility,including city or county,and latitude and longitude in decimal degrees; • the receiving water to which the regional facility is discharging;and • the number of total and impervious acres treated by the regional stormwater management plan to the nearest one-hundredth of an acre. The total of the impervious acreage may equal but not exceed the total acreage. Section V.Perpetual Nutrient Credits. If your site is utilizing nutrient credits,provide information related to all perpetual nutrient credits acquired in accordance with§62.1-44.15:35 of the Code of Virginia.Attach a separate list if needed. Attach the affidavit(s) of sale for the purchase of all nutrient credits acquired for this activity. Rev 04/2019 PAGE 5 16 CONSTRUCTION GENERAL PERMIT(VAR10) NOTICE OF TERMINATION 2019 INSTRUCTIONS PLEASE DO NOT PRINT OR SUBMIT Section VI. Permanent Control Measures. If applicable,list all post-development stormwater management facilities or best management practices(BMPs)that were constructed and installed as part of this activity to comply with the stormwater management technical criteria(structural and nonstructural,on-site and off-site).Choose the type from the list provided in the Notice of Termination form Section VI. If you have multiple BMPs,attach a separate list if needed. The following information shall be included for each permanent control measure installed: • the type of permanent control measure receiving the discharge(choose from list provided); • the date that it became functional as a permanent control measure(MM/DD/YYYY); • the location of the BMP,including city or county,and latitude and longitude in decimal degrees; • the receiving water(s)to which the permanent control measure discharges;and • the number of total and impervious acres treated by the permanent control measures to the nearest one-hundredth of an acre. The total of the impervious acreage may equal but not exceed the total acreage. The following items are required to be submitted with the Notice of Termination if you have permanent control measures: • Engineer's Certification Statement. Signed by a professional registered in the Commonwealth of Virginia,certifying that the stormwater management facilities were constructed in accordance with the approved plan. • Construction record drawing(s)(as-built plan)in a format as specified by the VSMP authority for permanent stormwater management facilities in accordance with 9VAC25-870-55 D appropriately sealed and signed. One digital and one full-sized paper copy. • Stormwater management plans(digital) • BMP Maintenance Agreement. Submit an original,signed and notarized BMP Maintenance Agreement for all public and private permits where DEQ is the VSMP Authority. Termination is not final until you submit the local court record of receipt to DEQ showing that the signed Storm water Management Maintenance Agreement was recorded with the land deed. Section VII. Certification. This Certification must be signed by a person representing the operator identified in Section I.and meeting the requirements of 9VAC25-880-70.Part III.K. Section VIII.Submittal Instructions. Submit this form to the VSMP Authority that has jurisdiction for your construction activity. The VSMP Authority may be either DEQ or your locality depending on the location and type of project. If your project is under the jurisdiction of a Local VSMP Authority,please contact the locality for additional submittal instructions. A blank area is provided for the Local VSMP Authority to include their mailing address. Who is the VSMP Authority for my project? DEQ or the locality? • DEQ: DEQ is the VSMP Authority and administers permit coverage for land-disturbing activities that are: > within a locality that is not a VSMP Authority; > owned by the State or Federal government;or > utilizing approved Annual Standards and Specifications. • The Locality: The local government(locality)is the VSMP Authority and administers permit coverage for all other projects not covered by DEQ as listed above. For these projects,please submit permit forms directly to the Local VSMP Authority A list of Local VSMP Authorities is available on DEQ's website here: Local VSMP Authority List. DEQ'S CONSTRUCTION GENERAL PERMIT WEBSITE http://www.deq.virginia.gov/Programs/Water/StormwaterManagement/VSMPPermits/ConstructionGeneralPermit.aspx Rev 04/2019 PAGE 6 16 WOOLLEY ENGINEERING May 5,2017 MEMORANDUM To: Mr. Bobby Jocz,EIT County of Albemarle,Virginia From: Mr.Eric Woolley,PE Woolley Engineering Regarding: SDP 2016-051—UVA Research Park: Town Center 4 Major Site Plan Amendment Adequate Channel Analysis This memo shall address the conditions of the downstream storm water conveyance system that currently supports Town Centers One, Three and Four of the UVA Research Park. The approved Site Development Plan(SDP) for Town Centers Three and Four was engineered with phasing of the development in mind. Town Center Three is substantially complete, and has been in use for approximately 9 years. The vision for Town Center Four has changed since the original site planning phase and is currently under review for a Major Site Plan amendment. The first phase of the original plan implementation required that the storm drainage piping and outfall for the two buildings would need to be installed with the Town Center Three project. That storm drainage piping reach and outfall is currently in place. The current Major Site Plan Amendment for Town Center Four proposes to utilize the existing outlet,the first leg of existing storm piping and the next storm structure located just upstream from the existing outfall. A new piping system is proposed to carry the overland surface flow through the existing outfall point. The fully developed Town Center District improvements are incrementally brought on-line with each successive building phase. The revised new storm drainage routing plan will introduce more surface flow area than the previous site plan illustrated;however,the piping system was overdesigned with the initial development in anticipation of the proposed future development illustrated on the Park's Master Plan. Storm drainage calculations provided with the WPO submission have shown that the existing pipe to be repurposed would be adequately sized. Due to the fact that more flow volume is anticipated with this submission,we will illustrate on the following pages that the downstream accepting channel can easily absorb the increased flows of the 2-year storm without topping its banks. Attached to this memo are three cross-section analyses of the downstream channel. The existing channel was designed and enhanced with the first phase of construction for the Research Park. The channel is a direct contributing conveyor of storm water to the Park's existing regional stormwater management facility. WOOLLEY ENGINEERING 220 East High Street (434) 973-0045 Charlottesville,Virginia 22902 Pursuant to 9VAC25-870-55, I hereby certify that to the best of my knowledge and belief the stormwater management facilities shown on these record drawings have been constructed in accordance with the approved plans and specificatio Eric Woolley,PEName Signature 037088 Ll-/ ?>p f 2� Virginia License Date ((( / "Certify means to state or declare a professional opinion based on sufficient and appropriate onsite,inspections, material tests,as-built survey data,and information ,provided by,other professionals and the contractor; conducted during or after construction. 0O Co r?\ g4 A u ''''I '''''- ''.--------" ..,...:".._/V i(ir ji/I 7,4"":"</-/ / i i , It • 7 I -e, '''':,. .:1 p "; , 7 rq . \\,,, \ ../ ,:_:0:, -,'4 ii b /1,.77 7 •k, Nii , , . \\ , ,4K- \ -.?, „,1 Existing Parking + \ � - , .� �` ExistingPiping \ N A ,A. A > � 0 Outfall (Beginning �\ j -� A. , ' ` ./; ; of ex. Channel) �� \V, +1 © ,� � O r ' ° y �` ,): **/ Top of Bank (From \���� • �; \� �� �� topographic survey, \ \\ `�\ \` :a2\ _� dated August 2016) \ \ /. Proposed new O `\� \; , hand placed \ \ , Proposed Storm class I rip rap ; 1 Drainage Piping 1 / / / ! Temporary O `/ / Sediment Basin / %�/Cross-section (typical) / / J , • 1 �,// i \ Ex. Sanitary a, i 3 Sewer I. ,I Ex. Storm Piping / in �••° / . . / \ \` S' Existing SWM Pond #i ' W/E 452.49 I °Q Edge of Water (Observed June 2016) I /1 ( `� ° A WOOLLEY ENGINEERING Channel Cross-Section Location Exhibit Consulting Civil Engineers Q 220 East High Street May 5,2017 Charlottesville =Virginia 22902 Scale:l"=100' (434)973 e 0045 www woolley-eng.com • liwstsmaiu WOOLLEY ENGINEERING Cross Section #1 (�-� ,. . _ _ ~��'-h`r •^_,�'....;1•Z�`u �A.:,ST'��[.'�?�i'�''.�'" :e.tM1 ' 7�••--�':;r�,r'- ck{ii_ v.�k .' E '4 jam'::i �T;s r s 7• ` 4. r -',,,ii,4„w---74.'� ,!; "r -.�' Ar Y•Y �` ,,,e,--:$' '{ ,,, i' ,,, LL 111 ,1c Lam'. , r 't`=,- \.., ��p „y,�"Y'y„ n• �r'�cc*-,,,? I. �4 t '. F 4-.n ii«aR.�> '�"�fi'i�Vi :..'', ] s. wa`9, ° '13-;• % : ' O�' 1 i' ti� � P , .L !It ! , ^rJJ :• .4 r y� a } --W-'4.T6i4":":4c: : " '2iattL'Ic ZI...W.:._.",,art41"4'Z' ,1,Vit.1/4.W.j. '....,.,,Z7---P. ' • * ,..?:'0 fit, ;I'1•li:• .,_44: .., ' , .-..,'C.V.74:' 'e "t• ...•,St.:1.•'-;" 4,.:'.. 16,..014.t..„. . . ~,t.., ,, L� �; View of Western Top of Bank ,Ci"7A Ce l CfC c �`'rt r ,4 • w're ++N '70 4 -0. �'; 3 kt,�'i+ :fir ray,` O'Ptr'-Th 'T {• .'•.° h c a ` 1 tir%L;7r#,ti�' %aL r r,4 Sri ,r '8'1 7r` • , fit'' 3f F;k L1 # .. +•° ' r• ''' �i, ;as„Aft . � , ti„a ,_ x'•'fi ; ?;' ' r = „3.,..r ._, �; r . r x Y3y d,_.a • ' '• , 4`. f=•.:.'�l '+, , ".r „` ,,::,.„, $4• View of the Center of Channel 'r_ r r 71'�,j{6�l ?� 14'may Ivy , s. .?: c rS / K. 1 rM 4' ,r ' 11.r` 4v ,r 7 r ut a 1 ,i 't`�a 1 y�d `J�i;�r�,,:yc Tf� ,e �� 'r w?"Y ,'s i' fib, 11 . 1� 3 y, r ,(,,, '' ,,,. •r,irs—;• `a-174.,f.+,psi 4`•,4..,: Ag.i'`. .44t., y,R� ��7 2 ' 1 '•��++1� f . '. lire-, a '�tr �} { 1i1{: li1�' a ` car? ••t syu rt�• F" : �s.y Z 't6". t rty .\ :\,:"":.'...).‘*: ‘,,s t,i,, j .... 1,0,--a3>)t .-l-it\•,p,t4i,\6.1,.:,,,.',-.,-Z.,,t.,,.1-V.;P,U,.R •'i ` •= o.$ 'ice�t��j7-y 77 O..,Ni 7 S ~ C •n JaCh 1` , RRRadd�\ l -� . ,�" }± L _ '` . View of the Eastern Top of Bank 3 UVA Research Park: Town Center Four WOOLLEY ENGINEERING Cross Section #1 490 1 Top othonki'itarnalicn}alai Irani S-YEAR STORM ElE1/ATION, • tapcgmphIc field suvey by,ark Hughes. IB0 - aAisoolCfM doted August,7016 I \� channel liovidapth for this cas medico 475 - _ - - --- - - gal obmeved on Apd 25.201Z was 15' 1 465 - - - - ___ ''55 - 1 • 45-10,. ,S5 30: --25 -2f -15, -10' .5 0. .5 10 25• :35: -45 45 50 :55 10 Chal61e1 Vfldtli reel]. Cross Section Calculations: Q = C * i *A Drainage Area- 1 LAND USE AREA(ac.) C C x A Wei:hted Runoff Coefficient • Industrial 10.24 0.9 9.22 0.63 Woods 8.13 0.3 2.44 2-Year Rainfall Intensity 18.37 11.66 i= 3.24 in/hr t, = 17.30 mins Q1 = 37.73 ft3/s .(drainage area peak discharge) V = (1.486) * R2/3 *S1/2 n Existing conditions: n=0.035 (Manning's roughness coefficient) R=0.12 (hydraulic radius) S=0.07 (channel slope) V1 = 2.77 ft/s (cross-sectional average velocity) Q = 2.13 ft3/s (cross-sectional flow rate) Fr= 1.03 (Froude number) 2-Year Storm(Peak Discharge): Q1 = 37.73 ft3/s n=0.035 R=0.57 S =0.07 V1(2_yr) = 7.85 ft/s Maximum water elevation for 2-year storm: 8.28" Cross Section Characteristics: The channel bed contains large and medium cobble as well as fine gravel. There is some pooling in this area with a depth of 6"that can be seen in the image view of the center of channel on the following page. The channel flow depth observed on April 25, 2017 was 1.5" for this section. There are a few small trees located along the side slopes near cross section 1 as well as one large tree. 4 , WOOLLEY ENGINEERING p.• T,MAt 41 Cross Section #2 . _.. .,, ,t,, . . 1. ,- .1., '24.tr?'il ''':- t - L-t.- 1- •,It `` 10- I i -1,,-4 ,..-- 1 t*1 ..• i , . 1 A 11. • 1,,,-"- ...-4 1, e •t-- it-,V,s,•., • , , , ' i cl,::, t .4, •-•tt"; - -,.. 1" ; ,,.. ::,••••2‘;,i''•- 4,4: ., . .- • ,t4l-ti„, .""..!.....,.,„,..,' ' 1,....4,. tr , :„..\,-.,.. ....,, ,„ ,.,., ., :;....--4..c!-:V.,.'^1,./1P.'f,le "-,"..-- -.::, -4-‘7"'•-'3- ,,.„„ , . ,,•,,,, 1,01 s., .r ';%;53,,-•,r, .. ..%if.*4• ke't,'"'41 Ity';',.,.,' ,„ IA:''','I.4".' 1 r ': t'' •P i ''''' :- Ugt,i-Vil'. 's•X-VAN'4.` ,.,.• . • 4, '•. I k '....r..,,,.4- :,, ; „ fr '.;p4,7.4v1 t .1r 0.9'''''' •-j"":•41. *-1: :-.),,4..- .0461":4.-11 •- ,:....../ 4. PC..., • -. .._ " , v -- ,-,.-.,2- '4 . 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' , ...1" , • ,..: 1•,,,/.ii!.N.' i, ••• F ' ri,„.44,...‘:741 •......... k., -. •-,,-,...• • - ---- - 4,,,,",,t , - 'c ,/ • `' `":i• '-- ..N.:, , . '. ,,-",ft..e. `';‘ 14 ' 0. --'• — "r,14teir. ,,• ..„. ) ,,, .."0...,`... ,4' 4,,, „ e,,,A , ; .,, .,-.., ,.." "620.C.:".'2'.''' ' ., • ',4„:•.,• ' -' ,)•,;:'.1 1,#',./ '• w''. • . I yi', ,V•• ' '''• 1-1,,,, •i'Mv;4'...1.,4.*.2 '1 ,'4/ •We5 ;10.7 ' N'trVI L '' \' *. '' s 4 f r 141."cri..1:4.5t .016, .......Ae 1, r,.,•' „„" ... 2 ,I-, ,.; 4,7:. ...,:,.... 'ir- 'r*,nr: •. 4t.:146."•fPet. ,..'ct ,40.4'..': .... - _ii.k. „ - ..P.it 4.4",-,-,„ .,., _lf, i'elp,,r ,, 3 .05.-,•N.;-. -, ,. . - -''''';'i, " -1'- -"A t Pt . r " -.0 *10. E4 4 11,.t....- •01., ,- ,„,;Nt-"'-`,t,,,,..,, ,-`: •,;,tv1,-1-...'1,),I,A„."‘„, ,f"-,„„4....„. ,t. •rN• 7-S1P.• '''''i: * •'i,Y, 41f,-, 4)..SL 't%4ii.f. ., , -Iv,,:,„. 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''re; " I# • . •% • View of Western Top of Bank View of the Eastern Top of Bank 5 UVA Research Park: Town Center Four WOOLLEY ENGINEERING Cross Section#2 I_ I I TH a Top of bank infvmotiah taken ham topographic field savoy by la Hughes Assoclotes doted August,0716 channel Row depth for fhb aoz section - —--. as observed on Apd 25.2017 was 17r I i YEAR STORM EIEVA710N—i 440 -fg 95, $0 :5 -26 -15_ `-lO ,3 b :E. 1o. 15: :Z ZS 30 05. ,40 45 sa SS 6g channe(Width(feet) Cross Section Calculations: Q = C * i *A Drainage Area-2 LAND USE AREA(ac.) C C x A Weighted Runoff Coefficient Industrial 10.50 0.9 9.45 0.60 Woods 10.48 0.3 3.14 2-Year Rainfall Intensity 20.98 12.60 i= 3.24 in/hr tc = 17.34 mins Q2 = 40.77 ft3/s (peak flow) V _ (1.486) * R2/3 *S1/2 l n Existing conditions: n=0.035 (Manning's roughness coefficient) R=0.08 (hydraulic radius) S=0.07 (channel slope) V2 = 2.11 ft/s (cross-sectional average velocity) Q = 0.55 ft3/s (cross-sectional flow rate) Fr= 1.32 (Froude number) 2-Year Storm (Peak Discharge): Q2 = 40.77 ft3/s n=0.035 R= 0.71 S=0.07 V2(2_yr) = 9.04 ft/s Maximum water elevation for 2-year storm: 13.08" Cross Section Characteristics: The channel bed contains medium cobble as well as medium and fine gravel. The channel flow depth observed on April 25, 2017 was 1.0" for this section. Side slopes for this area contains ferns, grasses, and small vegetation. There are a few small trees located on the banks along the channel on the East and West side. 6 4 WOOLLEY ENGINEERING , J , Cross Section #3 apt.. �' .. 7.' .1 .,,,•c` y 'i'. t�4. .a . ."t ,+. t,,f •c. +t 4" ��3i„�p�r�.'g+,�.,,•'r{�.: � .. .� �, t. F '�-�.�? S s,�,s� f s�d 'c -,•,_ ., ..,.. - .,,..., --.$1.' ",%I.,,,,,16;:.'1,,ri...k' 4a%;•,,,''A b'Sf y� A� a add a: Rt •. k� i� t y� t �% F....„..„., ,'Tr 1= • 1. �Y. 1 S_,, iT Tilt 9/,"11 N -,..A,. f" Z1 'u[ �_ 3. yrc� L'4^-„ • 1 3.. 4 y;°,,aC • w, r 'jj/ .... . 1, y`Ro �Sr .. �'r"C[,j '^,.. ,4 am"'.,,.5 < A,44-- ,.., •4T' -i4 �Yr . .: Y.-F ' y } +py`.i , lx r 't ��V�.. aa1�r,^.?'o•«•..� 7' •M'i., �Si:y,+C �+7 ,yi 'r G,+, r .. `,t , "a5,':K.q ' iX`` .2 ----N-Ch'.y:t,'te': -. �•'"'i52` 1 jFfY.� C e•s•'�' .,45- ,rk; 1, .t •i'"rs * ` wL.. ---4 lis.�_,44h•,e,, ''Y. , - 7.,�r . d',..•tF....: . M� ! s z ;• ''<aw.. i.. a`-h• y`.eta „:� . .i< 4..,4 e 3 t • C. •; { 'f- .f. *f aL..t...,,,Z�,a.,'f {; :�•_ ti f yjy n y f '`ti."�c.•':'i3 e.. �Ei .•.,14°t 4,t--).+r• .L".•.'s C"�t'-:. Ar,'.'T'- •=..r• -. t1++ -'Etrrd,.�,gP 'r-k, d: sri*f'ir', • t" R' -K rat-`N^ o- -,c At• .. .5?7 b' 4.'4• '.;. Y`''''' _ ,.r+ �W tq- rtf p _ ,� S+ 7 " W��Ti r~•yV M{.tea,i ~3‘a� T. jr4+r.j rAs lit* aik. t-' S I ✓ ¢.' ',\ ik3 • .y `' tii -- •" A � R ^„ y"''',el, 4 . �5` � ... . .»u �` •tr. . d' La��i'�- ,. - i aa � '".1 'R' \ :..hi•44.-.r K Iv:<°o « � 1. '.� ,.• t - 41-N • • • View of the Center of Channel Looking Downstream to the point of termination at an existing 54"RCP culvert ...;13",Ge'',1 ‘ Ors t iv.,k.~�i•Y- -1,< -I ',ui.,,-'•,ro- --i. .7. 1r'T i• iv, ..{N` -w-,,.-,reN y <, �.: • - r'Ga.rb F .Y',l{-,_�i„is4-1eV',. A . tr + r-j f_?L r r^ - ',y.A, ,h 4,3•,l.°ate },,t Yl, I it .A A`r Y �, . lr !•R-` `��-w� r'r � ..:. • • • r 4 `a ;�r t s y t 4 ', i �y ' 'ill I'll,' er 4 .r r ; i. i l' • f��-.t.4\1 t r, ,.is f a l 1`.r 40"`i ' - ,*(• 1 `f k s '§' e�~ •T. ' w , r 4 1 �?y{ - Y..?d,a?_ ,.. Jf�, r `"}, y ,,..,tz es+C r a _, yw , ,^l. ♦ ,_ d f •• ..c r tt L,,. ..,;;I.,... , _,, ,ir..7.,` 4••,...v4.4..0'2.• . ', z' ...."-.2- „Vigil,',...~... ,1,P,4".5-.^-11.6'49''''" ...: '"''''' 51,,,`'-'),,,>, -'1.•'..14,..4.-h.-,S10,-,-' ?-. '',,i,-' V:i...,%.:j.,,,,r-, LrellF4. „.: -.'. .-- Apt;._.ve•-..„.• tv., `r� �cj y•1•+t 1'1.. F Tl -Y 4'. ..e lam. fi "; y 7.,E 9(L i R%¢.f'- '•' [..'l^-=•I r.' ,.,,, r"4q� 4 �r t `'" t t"�°r� } Rii‘.,t a . '�i �fY� 'jM :_ r#��h G r'1 . 44 1 r rl 4-', \ f,jk 1Yt,I!/. Y i~�i- i :t`'•r •,,, "J , 1--,r1 p .-',J.,!,.,.....1 ' 4: -i Ad-N am' .+jtt'1 +`• 1119�. �i 1 A- '< _'•i+o- -.1. ,r. l A1' 3 '1 '.:,� ra t P!, t '+: rl . el. r is f. '�...':9a:, 4.; . View of the Center of Channel Looking Upstream 7 UVA Research Park: Town Center Four WOOLLEY ENGINEERING Cross Section #3 TB Top of bcnk infonnotion taken from topopmphld field survey by Hughes. Hugh . 4BD - ff ---=-- - ,._._._1 aAdoatohldated Au8ud,7016 ` 1 I !^ ,ChannuI flow depth far tW doss icn - 475 — --ILL -- ------- as observed on'ApI 75,2017wco 1E 5 '470 —--'-- — - _ 2-1'EAR STORM aEVATION 455 450.. I I I ,S5' =5D 75 -2! -15• =10 .4V 0 'S 10 15: 70 25 30' .55' -40 45 So -55 60 Charmd Wtdth[foot) Cross Section Calculations: Q =.C * i *A Drainage Area-3 LAND USE AREA(ac.) C C x A Wei_hted Runoff Coefficient Industrial 10.68 0.9 9.62 0.58 Woods 12.58 0.3 3.78 2-Year Rainfall Intensity 23.27 1. 13.39 i= 3.24 in/hr t, = 17.36 mins Q3 = 43.34 ft3/s (peak discharge) V (1.486) * R2/3 *S1/2 l n J Existing conditions: n=0.035 (Manning's roughness coefficient) R=0.12 (hydraulic radius) S=0.06 (channel slope) V3 = 2.56 ft/s (cross-sectional average velocity) Q = 1.00 ft3/s (cross-sectional flow rate) Fr= 1.36 (Froude number) 2-Year Storm (Peak Discharge): Q3 = 43.34 ft3/s n=0.035 R=0.76 S =0.06 V3(2_yr) = 8.94 ft/s Maximum water elevation for 2-year storm: 13.8" Cross Section Characteristics: The channel bed for cross section 3 contains medium to small cobble as well as fine gravel. The channel flow depth observed on April 25, 2017 was 1.5"for this section. Side slopes for this area contains relatively dense areas of ferns, grasses, and small vegetation. There are a few small trees located on both channel banks. 8 imosaumz ® t WOOLLEY ENGINEERING Existing Outfall from Storm.Drainage Piping at Town Center Four it :. : . ' ; '• � ' : Sff; � .1 f e '3F• :'• t' `4 r 1`^, S`'N'.'4o . .4Y • " .. ' = i . . rt -= ..„. ,0 't-.r:.- fit'- ' .:Fe _ >_ . '.� : : : 1 k; -. -,,,,,Sk .". 3 . -.,Fkl?.;14,1b_4c..!'il.M11 i.. -.2'4" '," ;_-,.-_-.- , .g41 "'t / , t%' -ieeiitgPf.v.zit.4 .4,-, v ,n Ili yet . n , ` y ,j.,c, _ ,tnFp ag , ift fyya L• N ''▪ l,. a _ : i 1 b-• $ads-.'+ •• f G 1 t --- s i'• �\. l,a,.. 1 J }�" ar''' J 1. ▪ { ;'C 4.... - `" ` -_ :.� 4 View of the ex. Precast End-Wall .. ., , r---, .A--;._,,..„.„,,...:, ,,. ,7441ip '�*h _ u`G▪ '.R F +icy, .'i. •+n M'Y2r e .. " ,'_ „--1111 f,1. mil;, 1,4 7 , ,r '�,- i. t A., .' ,•`h ate. . "--7;'t: e'` { s ' f ��. a S x- . A% - r t ''+i' , v.k� r r J "• g -r, ' , l � � ' ` r ' ' 34, -**--itt`-1' tr F ,, A 11- + ) 4 ,tv#.,A1 � _ { • b� .*:.%^fi {,e .,« _ Nhy M1fiJp -4:1 • • r_ `ice 0 4am,:,:1s - `, e .• asc 'r^ 6i. . ,. r ,r �ti if.: •� r?I�Vr���� J...•fkf, :S$y,."'i�1i f a � '.'f.•: ,4 -*•'ti ` .�{1''*. •i";_exi5�'s' S;Cc' " '114,J• ` `1;:-"m View of the ex. Outfall Condition ; y"�'i�,`.s� `s "" r e �= bx"`• 'w' + �1 -' ` ., View of existing channel at the tYyl It": N;, .,pT ,{ 41I', „,, ,, confluence of storm drainage ..-$r, ` , " i :A; A, .•. „Jr. . ,,•Y„ ,.,....„6, 5,..„ •a. .. ,. '%.` `� piping outlet protection ,fr ,, ,, ,,, �Tbc` a c a �„....,,.. .tr y. # , 7'h1V,°•,,,.„,,,,,a, ,� _ e ' `,f itc r�,�„ �. 3 ,,,— Y h -t.t•r a`;_ ,f� Additional Rip-rap outlet x- r � .; i, 4, {:,�,: y• ` f,�,`44.• ,, „-41 :i protection is proposed on the Y fit- J• �^ e`" 2''_.. -� } `• . current site plan to be hand placed �, ,+ • ''-M1= .ram •l°' ,c- �: :ems..: . , -s in this location. "..`' J . ,40 .• . •`fi.-- ;seat:"•'••," R,:.vi` ,K4, - 9 UVA Research Park: Town Center Four WOOLLEY ENGINEERING On April 25,2017,we walked along the drainage channel and observed the flow path and existing conditions of the channel. We were joined by Vinny Pero (US Army Corps of Engineers,)Frank Pohl (Albemarle County Engineer) and Bobby Jocz(Albemarle County Engineering Department.) All photographs utilized in this memo were taken the day of this site visit. At the request of the property owners,the channel was inspected in April 2016 by Wetland Studies and Solutions, Inc. (WSSI.) Their evaluation of the current conditions suggested that the channel should be considered waters of the U.S. (WOTUS.) On August 9, 2016,the U.S. Army Corps of Engineers accepted WS SI's Jurisdictional Determination of the channel's condition. Upon meeting with Mr. Pero on-site,the Corps' position was that the channel is in excellent condition and should not be disturbed by machinery. They also concurred that only hand-placed riprap armament should be considered for channel enhancement. The Corps agreed that the proposed new riprap would likely satisfy the restrictions of Nationwide Permit 18. As directed by Mr.Pero,no other documentation shall be required by the Corps. Based upon the data provided with each cross-section worksheet, and visual observation of the channel, it is our opinion that the concentrated runoff from the improved site will be discharged into an adequate channel. The additional proposed riprap outfall protection will reduce velocity and protect the channel from erosion. The existing channel is well-defined and the banks are capable of conveying the 2-year storm. Furthermore,the subject channel ultimately outfalls directly into the Park's regional stormwater management facility. The facility was engineered and constructed to contain the 2, 10 and 100-year storm with a fully developed condition for the entire Research Park. Current build-out of the Research Park does not yet approach 25%of the full potential of the allowable development. It is acknowledged that the UVA Research Park has been Master Planned for additional future development of the contributing drainage area of the subject channel. Thus,the applicant reserves the right to further enhance the channel in the future in accord with the standards of engineering practice and design. Please do not hesitate to call with any questions or concerns. Thank you for your time and consideration. Sincerely, Eric Woolley,PE Cc: Chris Schooley,UVA Foundation Nat Perkins, UVA Foundation 10 UVA Research Park:Town Center Four