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Home My WebLink AboutWPO201500078 Permit WPO VSMP 2013-12-17 General Permit for Discharges of Stormwater from Construction Activities (VAR10) Registration Statement (Please Type or Print All Information) 1. Construction Activity Operator(The permit will be issued to this operator,and the Certification in Item#13 must be signed by the appropriate person associated with this operator(see the instructions]): Name: NorthPointe Charlottesville LLC Mailing Address:2619 Hydraulic Road City:Charlottesville State:VA Zip:22901 Phone:434-296-4141 Email address(if available):david@southern-classic.com;mgabriel@cctownes.com Indicate if DEQ may transmit the permit electronically: Yes x No 2. (Must be included for renewals of coverage only)Existing Permit Coverage#: 3. Location of Construction Activity: Name:North Pointe Development Address:North East quadrant of the Rt.29 and Proffit Road intersection City:Charlottesville State:VA Zip:22911 County:Albemarle DMS to the nearest 15 seconds: Latitude Longitude Location of all Offsite Support Activities to be Covered Under the Permit: Name: Address: City: State: Zip: County: If street address unavailable:Latitude Longitude 4. Status of Activity:Federal! State! Public 0 Private 0 (Check one only) 5. The Nature of the Construction Activity(e.g.,commercial,industrial,residential,agricultural,oil and gas,etc.): residential I commercial mixed use community 6. Name of the Receiving Water(s):North Fork Rivanna River-Jacobs Run Hydrologic Unit Code(HUC):020802040303/JR11 (Receiving waters identified as impaired on the 2008 305(b)1303(d)Water Quality Assessment Integrated Report or for which a TMDL WLA has been established for stormwater discharges from a construction site shall be noted in art attached list) 7. If the discharge is through a Municipal Separate Storm Sewer System(MS4),the name of the municipal operator of the storm sewer:N/A 8. Estimated Project Start Date(mm/dd/yyyy):01/02/2014 Estimated Project Completion Date(mm/dd/yyyy):06/30/2024 9. Total Land Area of Development(to the nearest one-tenth acre):268.00 Estimated Area to be Disturbed(to the nearest one-tenth acre): 267.00 10. Is the area to be disturbed by the construction activity part of a larger common plan of development or sale?Yes! No® 11. Are nutrient offsets intended to be acquired for this activity?Yes[] No❑ Under consideration!✓ 12. A stormwater pollution prevention plan(SWPPP)must be prepared in accordance with the requirements of the General Permit for Discharges of Stormwater from Construction Activities prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. 13. Certification: "I certify under penalty of law that I have read and understand this Registration Statement 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 induding the possibility of fine and imprisonment for knowing violations." .�1 Print Name:David G�Mitcheli Title: /r"ir✓ Signature: Date: /Z7/7//3 (Please sign in INK.The person signing this form must be associated with the operator identified in ite• m#1 above.) Mail to: Deoartment of Environmental Qualitv_Office of Stormwater Management 10th Floor,P.O. Box 1105,_Richmond.VA 23218 (DEQ 199-146)(08/13) INSTRUCTIONS for FORM DEQ 199-146 General Permit Registration Statement-Construction Activity Stormwater Discharges General Hydrologic Unit Code(HUC)Is a watershed urht established ii the most recent A Registration Statement must be submitted to the Department of Erskonmental version of Virginia's 6"order national watershed boundary dataset. Quaky to register for coverage under the General Part for Moms/rider Section 7 Name of MS4 Operator Discharges from Construction Activities. If the stomwvater is discharged through a municipal separate storm sewer Section 1 Construction Activity Operator Information sYs (MS4),enter name of the MS4.The name of the "Operator means the owner or operator of any tacitly or activity subject to the MS4 operator is ueuaiy the Town. City, County, Institute or Federal facility Stormwater Management Act and regulations.In the context of stormwater where thine corstrudion activity is located. associated with a large or small construction activity, operator means any Section 8 Estimated Project Start Date person associated with a canstuctipn project that meets either of the followingEnter the date (Month/Day/Year)the projected is expected to start two criteria:(I)the person ties direct operational control over construction plans and specifications,including the ability to make modifications to those plans Estimatedthe datePr(Mot Completion Date and specifications or®the person has day-to-day operational control of those Enter (Month/Day/Year)the project is expected to be complete. activities at a project that are necessary to ensure compliance with a Section 9 Total Land Area of the Development stamwater poiution prevention plait for the site or other state permit conditions the total area(to the nearest one tenth acre)of the development(meaning (i.e., they are authorized to direct workers at a site to carry out activities the total acreage of the larger common plan of development or sale).Include required by the abrwater pollution prevention Plan or campy With other the total acreage of any offsite support activities to be covered underlie general penal condition). permit. The entities who are considered operators imil fcommonlyproject consist of the owner or Enter an es tod Area timate Disturbedthe total number of acres the nearest one tenth acre)to developer of a project(the party With control of project unp of the and the be disturbed. Include in the Estimated Area to be Disturbed the area of age contractorpartywec day b day operational control of the activities at disturbance that win occur at off-site project site which are necessary to ensure compliance with the state PP activities to be covered under the permit). Contractors and subcontractors who are under the general Perna supervision of the general contractor are not considered operators and would Section 10 Larger Common Plan of Development or Sale not need to submit a registration statement Give the legal name of the Indicate If the area to be disturbed by the construction activity Is part of a larger operator,do not use a colloquial urate.Enter the complete address and phone common plan of development or sale.Larger common plan of development or number of the operator.The permit will be issued to this operator. sale defines a contiguous are where separate and distinct conatnrtion may be Section 2 Existing General Permit Coverage Number ing f atdtferent limes on different schedules.Plan b broadly defined as For SPP only,indicate the existing general paint(coverage number for any announcement or doc mer�pn,including a sign,pubic notice or hearing, the project This sec ion does not need to be completed for new projects applying sales 'Pel application,zoning request,etc., s for state permit coverage. ircphysical demarcation such as boundary signs lot stake,and surveyor makings Section 3 Location of Construction Activity Information Silica ng that construction abates may occur. Enter the activity's official name and complete street address,inducing city(or Section 11 Nutrient Offsets town).county(if not located within a City),state and ZIP code. ttdirate l nutrient offsets as intended to be acquired h accordance Nttln§821- Kthe site lacks a street address,enter the city(or town),county(if not located 44.1535 of the Code of Virginia.time acquisi ion of offsets is being considered but within aand the latitude and anot 'select lrhder corrhaWderatiorh." City) longitude in degrees, minutes, seconds (OMS)to the nearest 15 seconds of the approximate osaater of the site(example Section 1g A stormwater pollution prevention plan(SWPPP)must be prepared 37°30'15"N 77°try 15'W). in accordance with the requirements of the General Permit for Discharges of Location of Offsite Support ActivitiesStom water from Construction Activities prior to submitting this Registration S By This general permit also authorizes*meter discharges from support activities the SWPPP StatementStatementStatements beRegistration Statement the operator is certifying that has been prepared. (e.g.,concrete or asphalt batch Plerftd,equipment staging yards,materiel serape areas,excavated material disposal areas,borrow areas)bated on-sitecroff•,y1e Section 13 Certification provided that(a)The support actuify is directly related b the construction site The operator Identified In Section 1 of this Registration Statement is that Is required to have general pertrdt coverage for discharges of sbmsvaler responsible for certifying and submitting this Registration associated wit constriction activity;(b)The support activity is not a commercial Statement Please sign the form In INK. State statutes provide for operation serving matiple unrelated construction projects by different operators, severe penalties for submitting false information.State regulations require and does not operate beyond the completion of the construction activity at the this Registration Statement to be signed as follows: last construction project it supports;and(c)Appropriate control measures are Fora corporation:by a responsible corporate officer.For the purpose of this identified in a stomsvater pollution prevention plan and implemented to address part,a responsible corporate officer means: the discharges from the support activity areascorporation or vice-president of the il)a president,secretary, in charge of a principal business Provide the information required for each off-site support activity seeking function,or any other person who performs sinner poky-maidng or decision- coverage.If an oft-site support activity is going to be covered by this perit the making tinxdbns for the corporation;or 00 the manager of one or more total land area of the off-site support activity and area to be disturbed by the off- manufacturing,production,or operating facilities,provided the manager is siteactivity need to be:,luded in the Estimated Area b be Disturbedmanagementection 8). regulated facility dig tin thatplicit or implick�ofmatng major Section 4 Status of Activity capitalInvestment recommendations,and initiating and directly other Indicate the appropriate status(Federal,State,Public,or Private)of the comprehensive measures to assure long-term commence with environmental activity. laws and regulations;the manager can ensure that the necessary systems are estabished or actions taken to gather complete and accurate information for Section 5 Nature of the Construction Project permit application requirements;and where authority to sign documents has Indicate the nature of the construction project (commercial, residential, been assigned or delegated to the manager b accordance with corporate agricultural,of and gas,etc).This ist is not air inciusive. procedures. ;action 6 Name of Receiving Water(s) For a partnership or sole proprietorship:by a general partner or the Enter the name of the receiving water(s) for all st rmwater discharge(s), proprietor,respectively. including any starmwater discharges from off-site support activities to be Fora municipality,state,federal,or other pubic agency by either a principal covered under the permit. Receiving waters identified as impaired on the executive officer or ranking elected official.For purposes dills part,a 2008 305(0)/303(d)Water Quaky Assessment Integrated Report or for which principal executive officer of a public agency includes:(I)the chief executive a Total Maximum Daily Load(TMDL)Waste Load Allocation(WLA)has been officer of the agency or n a senior executive officer having responsibility for established for stomnwater discharges from construction activities shall be the overall operations of a principal geographic unit of the agency. noted. The Department of Emirpnmental Quality reserves the ritrht to request additional infonnafien not directly addressed by the Registration Statement If.in its discretion.a facility or operation poses a potent ulimnact on water Quality,. (DEQ 199-146)(08/13) DEPARTMENT OF ENVIRONMENTAL QUALITY CONSTRUCTION ACTIVITY OPERATOR PERMIT FEE FORM (Please Type or Print All Information) Instructions: Applicants for a Construction Activity Individual Permit are required to pay permit application fees. Fees are also required for registration for coverage under a Construction Activity General Permit. Fees must be paid when applications for state permit issuance or modification are submitted. Applications will be considered incomplete if the proper fee is not paid and will not be processed until the fee is received. The fee schedule for state permits is included with this form. Fees for state permit issuance, reissuance, modification, maintenance, and reinspection are included. Once you have determined the fee for the type of application you are submitting, complete this form.The original copy of the form and your check or money order payable to'Treasurer of Virginia"should be mailed to: Department of Environmental Quality Receipts Control P.O.Box 1104 Richmond,VA 23218 A copy of this form and a copy of your check or money order should accompany the permit application (or registration statement).You should retain a copy for your records. Construction Activity Operator: Name:NorthPointe Charlottesville LLC FIN: 43— (9g 39 34 Mailing Address:2619 Hydraulic Road City:Charlottesville state:VA zip:22901 Phone:(434)296-4141 Name and Location COnstruction Activity: Name:North Pointe Development City:Charlottesville State:VA Zp:22911 County:Albemarle Type of State Permit: 0 Construction Activity Individual Permit 0 Construction Activity General Permit (from Fee Schedule) Type of Action: ©New Issuance ❑Reissuance ❑Modification 0 Maintenance ❑Reinspection Amount of Fee Submitted (from Fee Schedule): $760 Existing Permit Number(if applicable): FOR DEQ USE ONLY Date: DC#: (DEQ 199-213)(08/13) CONSTRUCTION ACTIVITY PERMIT FEE SCHEDULE A. Individual Permits.Applications for issuance of new Construction Activity individual permits, and for permittee initiated major modifications that occur (and become effective) before the specified state permit expiration date. (NOTE: Individual Construction Activity permittees pay an Annual State Permit Maintenance Fee instead of a reapplication fee.The permittee is billed separately by DEQ for the State Annual Permit Maintenance Fee.) TYPE OF STATE PERMIT ISSUANCE MODIFICATION Construction Stormwater Individual $15,000 $0 B. Registration Statements for Construction Activity General Permit Coverage.The fee for filing a state permit application(registration statement)for coverage under a Construction Activity general permit issued by the Board is as follows: TYPE OF STATE PERMIT ISSUANCE Construction General/Stormwater Management—Phase I Land Clearing("Large" Construction Activity-Sites or common plans of development or sale equal to or greater $750 than 5 acres) Construction General I Stormwater Management—Phase ll Land Clearing("Small" Construction Activity--Sites or common plans of development or sale equal to or greater $450 than 1 acre and less than 5 acres) Construction General I Stormwater Management—Small Construction Activity/Land Clearing (Sites within designated areas of Chesapeake Bay Act localities with land $200 disturbance acreage equal to or greater than 2,500 square feet and less than 1 acre) (Fee valid until July 1,2014) C. Permit Maintenance Fees. The annual permit maintenance fees apply to each state permit identified below, including expired permits that have been administratively continued. TYPE OF STATE PERMIT MAINTENANCE Construction General/Stormwater Management Phase I Land Clearing("Large" Construction Activity—Sites or common plans of development or sale equal to or greater $0 than 5 acres) Construction General/Stormwater Management—Phase II Land Clearing("Small" Construction Activity Sites or common plans of development or sale equal to or greater $0 than 1 acre and less than 5 acres) Construction General/Stormwater Management—Small Construction Activity/Land Clearing(Sites within designated areas of Chesapeake Bay Act localities with land $0 disturbance acreage equal to or greater than 2,500 square feet and less than 1 acre) Individual Permit for Discharges from Construction Activities $3,000 D. Reinspection Fee. The reinspection fee is required to be paid when the Department is required conduct a follow-up inspection based upon the findings of a previous Inspection. TYPE OF FEE REINSPECTION Construction Activity Reinspection $125 (DEQ 199-213)(08/13) GlTe ENGINEERfr473 r.r:. INTEE o UR as@NaWaa 9850..i.ORi ROAD SUITE 201 CHESTERFISLG VIRGINIA 2:;832 RECEIVED DATE JOB NO. 8i)4 PHONE ( `)748-9011 t F. X. (g0,1) 748. 5 DED FRO?, 1 DE ATTENTION 'TO ZO I tiRAY -6 Pt4 2t 07 RE: k WE ARE SENDING YOU 0 Attached ❑ Under separate cover via the following items: ❑ Shop drawings El Prints ❑ Plans ❑ Samples LI Specifications ❑ Copy of letter ❑ Change order C] COPIES DATE NO. DESCRIPTION THESE ARE TRANSMITTED as checked below: ❑ For approval ❑ Approved as submitted O Resubmit copies for approval ❑ For your use ❑ Approved as noted ❑ Submit copies for distribution ❑ As requested Ll Returned for corrections ❑ Return corrected prints ❑ For review and comment [3 • ❑ FOR BIDS DUE ❑ PRINTS RETURNED AFTER LOAN TO US REMARKS COPY TO SIGNED: If enclosures are not as noted,kindly notify us at once. Registration Statement General VPDES Permit for Discharges of Stormwater from Construction Activities (VAR10) (Please Type or Print All Information) 1. Construction Activity Operator: (General permit coverage will be issued to this operator. The Certification in Item#12 must be signed by the appropriate person associated with this operator.) Name:NorthPointe Charlottesville,LLC Contact:David Mitchell Mailing Address:2619 Hydraulic Road City:Charlottesville State:VA Zip.22901 Phone:434-296-4141 Email address(if available):david@southem-classic.com Indicate if DEQ may transmit general permit correspondence electronically: Yes p✓ No❑ 2. Existing General Permit Registration Number(for renewals only):VAR10C806 3. Name and Location of the Construction Activity: Name:North Pointe Development Address(if available):North East quadrant of the RT.29 and Proffit Road Intersection City:Charlottesville State:VA Zip:22911 County(if not located within a City):Albemarle Latitude(decimal degrees): Longitude(decimal degrees): Name and Location of all Off-site Support Activities to be covered under the general permit: Name:N/A Address(if available): City: State: Zip: County(if not located within a City): Latitude(decimal degrees): Longitude(decimal degrees): 4. Status of the Construction Activity(check only one): Federal❑ State❑ Public❑ Private�✓ 5. Nature of the Construction Activity(e.g.,commercial,industrial,residential,agricultural,oil and gas,etc.): Residential/Commercial mixed use community 6. Name of the Receiving Water(s)and Hydrologic Unit Code(HUC): Name:North Fork Rivanna River-Jacobs Run Name: HUC:020802040303/JR11 HUC: 7. If the discharge is through a Municipal Separate Storm Sewer System(MS4),the name of the MS4 operator: NIA 8. Estimated Project Start and Completion Date: Start Date(mm/dd/yyyy):01/02/2014 Completion Date(mm/dd/yyyy):06/30/2024 9. Total Land Area of Development(to the nearest one-hundredth acre):268.00 Estimated Area to be Disturbed(to the nearest one-hundredth acre):267.00 10. Is the area to be disturbed part of a larger common plan of development or sale? Yes❑ No❑✓ 11. A stormwater pollution prevention plan (SWPPP) must be prepared in accordance with the requirements of the General VPDES Permit for Discharges of Stormwater from Construction Activities prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. 12. Certification:"I certify under penalty of law that I have read and understand this Registration Statement 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 imprisop nt for knowing violations."/ n Printed Name: .ay..c (T- 'z el) Trtie:OeieLcpre. Signature: Date: .t////y (Please sign in INK. This Certification mu tie signed by the appropriate person associated with the operator identified in Item#1.) 01/2014 Page 1 of 1 DEPARTMENT OF ENVIRONMENTAL QUALITY CONSTRUCTION ACTIVITY OPERATOR PERMIT FEE FORM (Please Type or Print All Information) Instructions: Applicants for a Construction Activity Individual Permit are required to pay permit application fees. Fees are also required for registration for coverage under a Construction Activity General Permit. Fees must be paid when applications for state permit issuance, reissuance, modification or transfer are submitted. Applications will be considered incomplete if the proper fee is not paid and will not be processed until the fee is received. The fee schedule for state permits is included with this form. Fees for state permit issuance, reissuance, maintenance, modification and transfer are included. Once you have determined the fee for the type of application you are submitting, complete this form. The original copy of the form and your check or money order payable to 'Treasurer of Virginia" should be mailed to: Department of Environmental Quality Receipts Control P.O.Box 1104 Richmond,VA 23218 A copy of this form and a copy of your check or money order should accompany the permit application (or registration statement). You should retain a copy for your records. Construction Activity Operator: Name:North Pointe Charlottesville LLC Contact:David Mitchell Mailing Address:2619 Hydraulic Road City:CharlottesvilleState:VA Zip.22901 Phone:434-296-4141 Email address(if available):david@southern-classic.com Name and Location of the Construction Activity: Name:North Pointe Development City:Charlottesville State:VA Zip:22911 County:Albemarle Type of State Permit: ❑Construction Activity Individual Permit p Construction Activity General Permit (from Fee Schedule) Type of Action: ❑ New issuance Reissuance ❑ Maintenance 0 Modification 0 Transfer Amount of Fee Submitted(from Fee Schedule):$9,600 Existing General Permit Registration Number(if applicable):VAR10C806 FOR DEQ USE ONLY Date: DC#: 01/2014 Page 1 of 1 Townes IJEW ] C VRA NNY SITE ENGINEERING, P.C. DATE 8/10/2015 I JOB NO. 20070105 9850 LORI ROAD, SUITE 201 ATTENTION Holly Sepety/ Drew Hammond CHESTERFIELD, VIRGINIA 23832 RE North Pointe Development CGP Amendment PHONE (804) 748-9011 FAX (804) 748-2590 TO: DEQ - Stormwater Permitting 629 E. Main St., 10th Floor WE ARE SENDING YOU X Attached Under separate cover via the following items: Shop drawings Prints Plans Samples Specifications Copy of letter Change Order X Other: COPIES DATE NO. DESCRIPTION 1 8/10/15 1 Amended 2014 Reissuance Registration Statement 1 8/10/15 1 W-9 Refund Form THESE ARE TRANSM1 I I ED as checked below: For approval Approved as submitted Resubmit copies for approval x For your use Approved as note Submit copies for distribution As requested Return for corrections Return corrected prints For review and comment Other: FOR BIDS DUE PRINTS RETURNED AFTER LOAN TO US REMARKS Mr. Hammond, Attached please find an amended 2014 reissunace registration statement along with W-9 form to amend the perm North Pointe Development. Thank you for your assistance with this project! COPY TO SIGNED Mona Gabriel, P.E. Mona Gabriel From: Hammond, Drew(DEQ) <Andrew.Hammond@deq.virginia.gov> Sent: Wednesday, February 25, 2015 6:23 PM To: Mona Gabriel; 'Brian Mitchell'; David Mitchell' Cc: Sepety, Holly(DEQ);GBROOKS@albemarle.org Subject: RE: Permit Modification Attachments: W9_Refund.pdf Good afternoon, Mona, Please submit an amended 2014 reissuance registration statement indicating that the total area of development is 267.00 acres and that the estimated area to be disturbed is 4.27 acres. In addition, please have the party responsible for providing the original permitting fee ($9600)complete the attached W-9 form(this information must match the information provided on the original check or money order). Also, a permit modification fee is not applicable for this action. Once received, the applicable 2014 reissuance fee will be adjusted from $9600 to $2700 and a refund will be issued for the difference. The local VSMP authority,Albemarle County, will then be reimbursed 72%of the applicable permit reissuance fee for permit administration. Please let me know if you have any questions. Thanks, Drew From: Mona Gabriel [mailto:mgabriel@cctownes.com] Sent: Tuesday, February 24, 2015 3:37 PM To: Hammond, Drew(DEQ) Cc: 'David Mitchell'; 'Brian Mitchell' Subject: FW: Permit Modification Mr. Hammond, I wanted to send you the email below that I received from Holly Sepety in reference to the permit modification for North Pointe. I sent Ms. Sepety an email yesterday to verify the fee amount for the permit modification and I received the email below. I think that Ms. Sepety is not aware of the decision that was made on how to handle the permit modification for North Pointe. I will give you a call to discuss the best way to handle the permit modification process and see what the steps that we need to take are. Thank you, Mona Gabriel, P.E. Townes Site Engineering (8041920-1459 From: Sepety, Holly(DEQ) [mailto:Holly.Sepety@deq.virginia.gov] Sent: Tuesday, February 24, 2015 7:14 AM To: Mona Gabriel Subject: RE: Permit Modification 1 Permit coverages cannot be modified to decrease acreages. You can only increase acreages. if a portion of the site is completed or stabilized or sold or is no longer in your operational control,you should note that in the Stormwater Pollution Prevention Plan (SWPPP) that is maintained onsite. You cannot terminate a portion of a permit coverage,you can only terminate then whole permit coverage once the entire permitted site meets one or more of the termination conditions. The SWPPP is where you note when portions of the site are completed, sold, stabilized or under someone else's operational control until such time as you are able to terminate the entire permit coverage. Please do not submit a modification or fee for this action. You only need to update your onsite SWPPP to show the changes to the site area. Also, if you intend to work on the other portion of the site in the future, it would be cheaper to maintain your current permit coverage so you will not have to pay additional permit tees. If you must have a permit coverage for the lower acreage amount,you will need to obtain a new permit coverage and pay applicable new permit fees, then terminate the existing larger coverage. It you chose to do this,you may be responsible for the current 2014 permit's technical criteria and no longer be vested under the previous 2009 permit cycle's technical criteria (which you currently are since you renewed permit coverage from the 2009 permit cycle). Please let me know if you have questions. Holly C.Sepety Stormwater Permit Specialist Department of Environmental Quality 629 E Main St 10th Fl Richmond VA 23219 804-698-4039 bolly.sepetyadeq.virgi nia.gpv www.ded.virginia.gov From: Mona Gabriel [mailtQ:mgabriel cctownes.com] Sent: Monday, February 23, 2015 4:34 PM To: Sepety, Holly(DEQ) Subject: Permit Modification Hi Holly, Hope all is well. I left a message on your voice mail earlier today and thought I'd follow up with this email.We are getting ready to submit a revised registration statement for permit No.VAR10C806 to modify the disturbed area to be only for the first phase of the project as opposed to the overall anticipated disturbed area.The disturbed area on the current permit is 267 acres and we are revising it to be 4.27 acres.Since the permit modification is to reduce the disturbed area will the fee be only for the permit modification($200 for sites with land disturbance acreage equal to or greater than one acre and less than five acres).Could you please confirm the fee amount or let me know if I got it wrong. Thank you. Mona Gabriel, P.E. Project Manager 9850 Lori Road,Suite 201 Chesterfield.VA 23832 Office:(804)748-901 1 Ext.297 Cell:(804)920-1459 Fax:(804)748-2590 www.cctownes.com •j$" 2 Registration Statement General VPDES Permit for Discharges of Stormwater from Construction Activities (VAR10) (Please Type or Print All Information) 1. Construction Activity Operator: (General permit coverage will be issued to this operator The Certification in Item #12 must be signed by the appropriate person associated with this operator.) Name:NorthPointe Charlottesville,LLC Contact:David Mitchell Mailing Address:2619 Hydraulic Road City:Charlottesville State:VA Zip:22901 Phone 434-296-4141 Email address(if available):david@southern-classic.com Indicate if DEQ may transmit general permit correspondence electronically: Yes 0 No 0 2. Existing General Permit Registration Number(for renewals only):VAR10C806 3. Name and Location of the Construction Activity: Name:North Pointe Development Address(f available):North East quadrant of the RT.29 and Proffit Road intersection City:Charlottesville State.VA Zip:22911 County(if not located within a City):Albemarle Latitude(decimal degrees): Longitude(decimal degrees): Name and Location of all Off-site Support Activities to be covered under the general permit: Name:N/A Address(if available): City: State: Zip: County(if not located within a City): Latitude(decimal degrees): Longitude(decimal degrees): 4. Status of the Construction Activity(check only one): Federal 0 State❑ Public 0 Private 0 5. Nature of the Construction Activity(e.g.,commercial,industrial,residential,agricultural,oil and gas,etc.): Residential/Commercial mixed use community 6. Name of the Receiving Water(s)and Hydrologic Unit Code(HUC): Name:North Fork Rivanna River-Jacobs Run Name: HUC:020802040303/JR11 HUC: 7. If the discharge is through a Municipal Separate Storm Sewer System(MS4),the name of the MS4 operator: N/A 8. Estimated Project Start and Completion Date: Start Date(mm/dd/yyyy):05/01/2015 Completion Date(mm/dd/yyyy):06/30/2024 9. Total Land Area of Development(to the nearest one-hundredth acre):268.00 Estimated Area to be Disturbed(to the nearest one-hundredth acre):4.27 10. Is the area to be disturbed part of a larger common plan of development or sale? Yes 0 No 0 11. A stormwater pollution prevention plan (SWPPP)must be prepared in accordance with the requirements of the General VPDES Permit for Discharges of Stormwater from Construction Activities prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. 12. Certification: "I certify under penalty of law that I have read and understand this Registration Statement 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." n ! Printed Name � i' YV1'I/�GLL-- Title: �/G�+ 4 .t/,7I ' Signature' Date: $/'7115 (Please sign in INK. This Certification must be signed by the appropriate person associated with the operator identified in Item#1.) 01/2014 Page 1 of 1 Instructions for Completing the Registration Statement General VPDES Permit for Discharges of Stormwater from Construction Activities (VARIO) GENERAL stormwater pollution prevention plan or comply with other permit conditions). A.Coverage Under this General Permit. The entities that are considered operators will commonly consist of the Any operator applying for coverage under this general permit who is owner or developer of a project(the party with control of project plans required to submit a Registration Statement (see Section B below) and specifications)or the general contractor(the party with day to day must submit a complete Registration Statement to the Department. operational control of the activities at the project site which are The Registration Statement serves as a Notice of Intent for coverage necessary to ensure compliance with the general permit). under the General VPDES Permit for Discharges of Stormwater from Construction Activities(VAR10). Provide the legal name(do not use a colloquial name),contact,mailing address. telephone number, and email address (if available) of the B.Single-family Residences. construction activity operator;general permit coverage will be issued to this operator. Indicate if the Department may transmit general permit Operators with an existing stormwater discharge or proposing a new correspondence electronically. stormwater discharge associated with the construction of a single- family residence separately built, disturbing less than one acre and Item 2:Existing General Permit Registration Number. part of a larger common plan of development or sale is not required to submit a Registration Statement, provided that the stormwater For reapplication only,provide the existing general permit registration management pian for the larger common plan of development provides number for the construction activity. This item does not need to be permanent control measures (i.e., stornwater management facilities) completed for new construction activities applying for general permit encompassing the single family residence. coverage. Operators of these types of discharges are authorized to discharge Item 3: Name and Location of the Construction Activity under this general permit immediately upon the general permit's Information. effective date of July 1,2014. Provide the official name,street address(if available),city or county(if C.To Apply for Permit Coverage. not located within a City)of the construction activity. Also,provide the latitude and longitude in decimal degrees of the approximate center of 1. New Construction Activities. Any operator proposing a new the construction activity(e.g.,N 37.5000,W 77.5000). stormwater discharge from construction activities shall submit a complete Registration Statement to the Department prior to the Name and Location of Off-site Support Activity Information. commencement of land disturbance,unless exempted by Section B above. Any operator proposing a new stormwater discharge from This general permit also authorizes stormwater discharges from construction activities in response to a public emergency where the support activities (e.g., concrete or asphalt batch plants, equipment related work requires immediate authorization to avoid imminent staging yards, material storage areas, excavated material disposal endangerment to human health or the environment is immediately areas, borrow areas) located on-site or off-site provided that (i) the authorized to discharge under this general permit and must submit a support activity is directly related to a construction activity that is complete Registration Statement to the Department no later than 30 required to have general permit coverage;(ii)the support activity is not days after commencing land disturbance; documentation to a commercial operation, nor does it serve multiple unrelated substantiate the occurrence of the public emergency must construction activities by different operators; (iii) the support activity accompany the Registration Statement. does not operate beyond the completion of the construction activity it supports; (iv) the support activity is identified in the registration 2. Existing Construction Activities. Any operator that was statement at the time of general permit coverage; (v) appropriate authorized to discharge under the general permit issued in 2009, control measures are identified in a SWPPP and implemented to and who intends to continue coverage under this general permit, address the discharges from the support activity areas; and (vi) all shall submit a complete Registration Statement to the Department applicable state, federal, and local approvals are obtained for the on or before June 1,2014,unless exempted by Section B above. support activity. D.Where to Submit Registration Statements. Provide the official name,street address(if available),City and County (if not located within a City) of all off-site support activities to be All Registration Statements should be submitted to: covered under this general permit. Also, provide the latitude and longitude in decimal degrees of the approximate center of the off-site Department of Environmental Quality support activities (e.g., N 37.5000, W 77.5000). Also, if an off-site Office of Stormwater Management,10th Floor support activity is going to be covered under this general permit the P.O.Box 1105 total land area of the off-site support activity and the estimated area to Richmond,VA 23218 be disturbed by the off-site support activity need to be included in Item #9. LINE-BY-LINE INSTRUCTIONS Item 4:Status of the Construction Activity. Item 1:Construction Activity Operator Information. Indicate the appropriate status (Federal, State. Public, or Private) of "Operator" means the owner or operator of any facility or activity the construction activity. subject to the Stormwater Management Act and regulations. In the context of stormwater associated with a large or small construction Item 5:Nature of the Construction Activity. activity, operator means any person associated with a construction project that meets either of the following two criteria:(I)the person has Provide a brief description of the construction activity, such as direct operational control over construction plans and specifications, commercial,residential,agricultural,oil and gas,etc.This list is not all including the ability to make modifications to those plans and inclusive. specifications or(ii)the person has day-to-day operational control of those activities at a project that are necessary to ensure compliance Item 6:Receiving Waters(s)and HUC Information. with a stormwater pollution prevention plan for the site or other state permit or VSMP authority permit conditions(i.e.,they are authorized to Provide the name of the receiving water(s)and corresponding HUC for direct workers at a site to carry out activities required by the all stormwater discharges including any stormwater discharges from off-site support activities to be covered under this general permit. 01/2014 Page 1 of 2 Hydrologic Unit Code or HUC is a watershed unit established in the gather complete and accurate information for permit application most recent version of Virginia's 6"order national watershed boundary requirements; and where authority to sign documents has been dataset assigned or delegated to the manager in accordance with corporate procedures. Item 7:MS4 Information. b. For a partnership or sole proprietorship: by a general partner or If stormwater is discharged through a municipal separate storm sewer the proprietor,respectively. system(MS4),provide the name of the MS4 operator.The name of the MS4 operator is generally the Town,City,County, Institute or Federal c. For a municipality,state,federal,or other public agency:by either facility where the construction activity is located. a principal executive officer or ranking elected official. For purposes of this part,a principal executive officer of a public agency includes: Item 8: Construction Activity Start and Completion Date Information. (i)The chief executive officer of the agency,or Provide the estimated start date (month/day/year) of the construction (ii)A senior executive officer having responsibility for the overall activity. Provide the estimated completion date (month/day/year) of operations of a principal geographic unit of the agency. the construction activity. Item 9:Construction Activity Area Information. Provide the total area (to the nearest one-hundredth acre) of the development (i.e.., the total acreage of the larger common plan of development or sale). Include the total acreage of any off-site support activity to be covered under this general permit. Provide the estimated area(to the nearest one-hundredth acre)to be disturbed by the construction activity. Include the estimated area of land disturbance that will occur at any off-site support activity to be covered under this general permit. Item 10:Common Plan of Development or Sale Information. Indicate if the area to be disturbed by the construction activity is part of a larger common plan of development or sale.Larger common plan of development or sale is defined as a contiguous area where separate and distinct construction may be taking place at different times on different schedules. Plan is broadly defined as any announcement or documentation, including a sign, public notice or hearing, sales pitch, advertisement, drawing, permit application, zoning request, etc., or physical demarcation such as boundary signs, lot stakes, or surveyor markings indicating that construction activities may occur. Item 11:Stormwater Pollution Prevention Plan(SWPPP). A Stormwater Pollution Prevention Plan(SWPPP)must be prepared in accordance with the requirements of the General VPDES Permit for Discharges of Stormwater from Construction Activities(VAR10)prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. Item 12:Certification. A properly authorized individual associated with the operator identified in Item 1 of the Registration Statement is responsible for certifying and signing the Registration Statement. Please sign the Registration Statement in INK. State statutes provide for severe penalties for submitting false information on the Registration Statement. State regulations require that the Registration Statement be signed as follows: a. For a corporation: by a responsible corporate officer. For the purpose of this part,a responsible corporate officer means: (i) A president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function,or any other person who performs similar policy-making or decision-making functions for the corporation,or (ii) the manager of one or more manufacturing, production, or operating facilities, provided the manager is authorized to make management decisions that govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long-term compliance with environmental laws and regulations;the manager can ensure that the necessary systems are established or actions taken to 01/2014 Page 2 of 2 Form W-9 Request for Taxpayer Give Form to the (Re(Rev.August 2013) requester.Do not v.Augusnt t 201the 3reasury Identification Number and Certification send to the IRS. Internal Revenue Service Nameas s own on o` e tax re um ►- ► 3 Ch to eSVI ( LLC Business name/disregarded entity name,if different from above Check appropriate box forfederal tax classification: Exemptions(see instructions): a ❑IndividuaVsole proprietor ❑ C Corporation ❑S Corporation ❑ Partnership ❑Trust/estate N n o Exempt payee code(if any) o`Limited(ability company.Enter the tax classification(C=C corporation,S=S corporation.P.-partnership)► Exemption from FATCA reporting cHc code(f any) a u 0 Other(see instructions) • ► Address(nu r,street.and apt.or suite no.) Requester's name and address(optional) Nob _ rJ City, tate,and ZIP code co Camc - QSVi l ie( \) 0 qO5 List account number(s)here(optional) Part I Taxpayer Identification Number(TINS Enter your TIN in the appropriate box.The TIN provided must match the name given on the"Name"line Social security number to avoid backup withholding.For individuals,this is your social security number(SSN).However,for a resident alien,sole proprietor,or disregarded entity,see the Part I instructions on page 3.For other - - entities,it Is your employer identification number(EIN).If you do not have a number,see How to get a TIN on page 3. Note.If the account is in more than one name,see the chart on page 4 for guidelines on whose Employer identification number number to enter. 3 - ' b 317 3 Part II Certification Under penalties of perjury,I certify that: 1. The number shown on this form is my correct taxpayer identification number(or I am waiting for a number to be issued to me).and 2. I am not subject to backup withholding because:(a)I an,exempt from backup withholding,or(b)I have not been notified by the Internal Revenue Service(IRS)that I am subject to backup withholding as a result of a failure to report all interest or dividends,or(c)the IRS has notified me that I am no longer subject to backup withholding,and 3. I am a U.S.citizen or other U.S.person(defined below),and 4.The FATCA code(s)entered on this form(if any)indicating that I am exempt from FATCA reporting is correct. Certification instructions.You must cross out item 2 above if you have been notified by the IRS that you are currently subject to backup withholding because you have failed to report all interest and dividends on your tax return.For real estate transactions,item 2 does not apply.For mortgage interest paid,acquisition or abandonment of secured property,cancellation of debt,contributions to an individual retirement arrangement(IRA),and generally,payments other than interest and dividends,you are not required to sign the certification,but you must provide your correct TIN.See the instructions on page 3. HSof Here u.s.personDate .gI7//5 General Instructions witi'holding tax on foreign partners'share of effectively connected income,and Section references are to the Internal Revenue Code unless otherwise noted. 4.Certify that FATCA code(s)entered on this form(it any)indicating that you are exempt from the FATCA reporting,is correct. Future developments.The IRS has created a page on IRS.gov for information Note.If you are a U.S.person and a requester gives you a term other than Form about Form W-9,at www.irs.gov/w9.Information about any future developments W-9 to request your TIN.you must use the requester's form if it is substantially affecting Form W-9(such as legislation enacted after we release it)will be posted similar to this Form W-9. on that page. Definition of a U.S.person.For federal tax purposes,you are considered a U.S. Purpose of Form person if you are: A person who is required to file an information return with the IRS must obtain your •An individual who is a V.S.citizen or U.S.resident alien, correct taxpayer identification number(TIN)to report,for example,income paid to •A partnership,corporation,company,or association created or organized in the you,payments made to you in settlement of payment card and third party network United States or under the laws of the United States. transactions,real estate transactions,mortgage interest you paid,acquisition or •An estate(other than a foreign estate),or abandonment of secured property.cancellation of debt,or contributions you made •A domestic trust(as defined in Regulations section 301.7701-7 to an IRA. 9 ). Use Form W-9 only if you are a U.S.person(including a resident alien),to Special rules for partnerships.Partnerships that conduct a trade or business in provide your correct TIN to the person requesting it(the requester)and,when the United States are generally required to pay a withholding tax under section applicable,to: 1446 on any foreign partners'share of effectively connected taxable income from 1.Certify that the TIN you are giving is correct(or you are waiting for a number such business.Further,in certain cases where a Form W-9 has not been received, the rules under section 1446 require a partnership to presume that a partner is a to be issued), foreign g person,and pay the section 1446 withholding tax.Therefore,if youare a 2.Certify that you are not subject to backup withholding,or U.S.person that is a partner in a partnership conducting a trade or business in the 3.Claim exemption from backup withholding if you are a U.S.exempt payee.If United States,provide Form W-9 to the partnership to establish your U.S.status applicable,you are also certifying that as a U.S.person,your allocable share of and avoid section 1446 withholding on your share of partnership income. any partnership income from a U.S.trade or business is not subject to the Cat.No.10231X Form W-9(Rev.a-2013) DEPARTMENT OF ENVIRONMENTAL QUALITY CONSTRUCTION ACTIVITY OPERATOR PERMIT FEE FORM (Please Type or Print All Information) Instructions: Applicants for a Construction Activity Individual Permit are required to pay permit application fees. Fees are also required for registration for coverage under a Construction Activity General Permit. Fees must be paid when applications for state permit issuance, reissuance, modification or transfer are submitted. Applications will be considered incomplete if the proper fee is not paid and will not be processed until the fee is received. The fee schedule for state permits is included with this form. Fees for state permit issuance, reissuance, maintenance, modification and transfer are included. Once you have determined the fee for the type of application you are submitting, complete this form. The original copy of the form and your check or money order payable to "Treasurer of Virginia" should be mailed to: Department of Environmental Quality Receipts Control P.O. Box 1104 Richmond,VA 23218 A copy of this form and a copy of your check or money order should accompany the permit application (or registration statement). You should retain a copy for your records. Construction Activity Operator: Name: NorthPointe Charlottesville LLC Contact: David Mitchell Mailing Address:2619 Hydraulic Road City: Charlottesville State:VA zip:22901 Phone:434-296-4141 Email address (if available):david@southern-classic.com Name and Location of the Construction Activity: Name: North Pointe Development City: Charlottesville State:VA zip:22911 County:Albemarle Type of State Permit: ❑ Construction Activity Individual Permit ❑✓ Construction Activity General Permit (from Fee Schedule) Type of Action: ❑ New Issuance ❑ Reissuance ❑ Maintenance ,r❑ Modification ❑Transfer Amount of Fee Submitted (from Fee Schedule): N/A per Drew Hammond's email dated 2/26/15 Existing General Permit Registration Number(if applicable):VAR10C806 FOR DEQ USE ONLY Date: DC#: 01/2014 Page 1 of 1 CONSTRUCTION ACTIVITY PERMIT FEE SCHEDULE A. Individual Permits. The fee for filing a state permit application for a Construction Activity Individual Permit issued by the Board is as follows: (NOTE: Individual permittees pay an annual permit maintenance fee instead of a reapplication fee. The permittee is billed separately by DEQ for the annual permit maintenance fee.) TYPE OF STATE PERMIT ISSUANCE Individual Permit for Discharges from Construction Activities $15,000 B. Registration Statements. The fee for filing a state permit application (registration statement) for coverage under a Construction Activity General Permit issued by the Board, including a state or federal agency that does not administer a project in accordance with approved annual standards and specifications,is as follows: TYPE OF STATE PERMIT ISSUANCE General/Stormwater Management-Small Construction Activity/Land Clearing(Areas within common plans $290 of development or sale with land-disturbance acreage less than one acre) General/Stormwater Management-Small Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than one acre and $2,700 less than five acres) General/Stormwater Management-Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than five acres and $3,400 less than 10 acres) General/Stormwater Management-Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 10 acres and $4,500 less than 50 acres) General/Stormwater Management-Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 50 acres and $6,100 less than 100 acres) General/Stormwater Management-Large Construction Activity/Land Clearing(Sites or areas within $9,600 common plans of development or sale with land-disturbance acreage equal to or greater than 100 acres) The fee for filing a state permit application (registration statement)for coverage under a Construction Activity General Permit issued by the Board for a state or federal agency that administers a project in accordance with approved annual standards and specifications is as follows: TYPE OF STATE PERMIT ISSUANCE Construction General/Stormwater Management—Phase I Land Clearing("Large"Construction Activity— $750 Sites or common plans of development or sale equal to or greater than 5 acres) Construction General/Stormwater Management—Phase II Land Clearing("Small"Construction Activity— $450 Sites or common plans of development or sale equal to or greater than 1 acre and less than 5 acres) 01/2014 Page 1 of 2 C. State Permit Modification or Transfer Fees. The following fees apply to the modification or transfer of a Construction Activity Individual Permit or a Construction Activity General Permit issued by the Board. The fee assessed shall be based on the total disturbed acreage of the construction activity. In addition to the state permit modification fee, modifications resulting in an increase in total disturbed acreage shall pay the difference in the initial Construction Activity General Permit fee paid and the Construction Activity General Permit fee that would have applied for the total disturbed acreage in Section B above. TYPE OF STATE PERMIT MODIFICATION General/Stormwater Management—Small Construction Activity/Land Clearing(Areas within common $20 plans of development or sale with land disturbance acreage less than one acre) General/Stormwater Management—Small Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than one and less $200 than five acres) General/Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than five acres and $250 less than 10 acres) General/Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 10 acres and $300 less than 50 acres) General/Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 50 acres and $450 less than 100 acres) General/Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within $700 common plans of development or sale with land-disturbance acreage equal to or greater than 100 acres) Individual Permit for Discharges from Construction Activities $5,000 D. State Permit Maintenance Fees. The following annual state permit maintenance fees apply to each state permit identified below, including expired permits that have been administratively continued. No annual state permit maintenance fee is required for coverage under a Construction Activity General Permit for a state or federal agency that administers a project in accordance with approved annual standards and specifications. TYPE OF STATE PERMIT MAINTENANCE General/Stormwater Management—Small Construction Activity/Land Clearing(Areas within common $50 plans of development or sale with land disturbance acreage less than one acre) General/Stormwater Management—Small Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than one and less $400 than five acres) General/Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than five acres and $500 less than 10 acres) General/Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 10 acres and $650 less than 50 acres) General/Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within common plans of development or sale with land-disturbance acreage equal to or greater than 50 acres and $900 less than 100 acres) General I Stormwater Management—Large Construction Activity/Land Clearing(Sites or areas within $1,400 common plans of development or sale with land-disturbance acreage equal to or greater than 100 acres) Individual Permit for Discharges from Construction Activities $3,000 01/2014 Page 2 of 2 Section 2. Notice of general permit coverage (This notice is to be posted near the main entrance according to 9VAC25-880-70, Part II, section C.) Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County T 011 y COMMONWEALTH of VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY Street address:629 East Main Street,Richmond,Virginia 23219 Douglas W.Domenech Mailing address:P.O.Box 1105,Richmond,Virginia 23218 David K.Paylor Secretary ofNatrral Resources TDD(804)698-4021 Director www.deq.virginia.gov (804)698-4020 1-800-592-5482 1/8/2014 North Pointe Charlottesville LLC 2619 Hydraulic Rd ' Charlottesville,VA 22901 RE: Construction General Permit Coverage#VAR1OC806,Northe Point Development-Residential/Commercial- Mixed use community- Charlottesville Dear David G Mitchell: DEQ has received your registration statement for the proposed land-disturbing project under the General Permit for Discharges of Stormwater from Construction Activities(VAR10). The project's date of coverage is either the date of this letter or fifteen business days after the postmark date of the project's complete registration packet submittal to DEQ. By submission of the registration statement,you acknowledge that the proposed project is eligible for coverage under the General Permit and you have agreed to the conditions in the General Permit including any applicable conditions regarding Total Maximum Daily Loads and impaired waters. Please be aware that§62.1-44.15:35 of the Code of Virginia and the General Permit contain additional requirements if nonpoint nutrient offsets are chosen to meet the post-development nonpoint nutrient runoff compliance requirements. Section§62.1-44.15:35 I requires that the permit issuing authority require that nonpoint nutrient offsets or other off-site options achieve the necessary nutrient reductions PRIOR TO THE COMMENCEMENT OF THE PERMITTEE'S LAND DISTURBING ACTIVITY. A copy of the General Permit is available on the DEQ web page at http://www deq.virginia.gov/Portals/0/DEQ/Water/Publications/CGPvarlo.pdf. Print the VAR10 permit and read it carefully as you are responsible for meeting all the permit conditions.The General Permit will expire on June 30,2014. Your project specific permit registration number is VAR10C806. A copy of this permit coverage letter,registration statement,copy of the VAR10 permit,and the project's Stormwater Pollution Prevention Plan(SWPPP)must be at the construction site from the date of commencement of the construction activity to final stabilization. In addition,DEQ staff conduct periodic site inspections for compliance with the permit. Additional information is available on the DEQ webpage at: http://www.deq.virgins.gov/proet'ams/water/stormwatermanagement/vsmppermits/constructiongeneralpermit.aspx. For questions,contact the Permit Processor at(804)698-4039. Sincerely, ateLe‘. Frederick K.Cunningham,Director Office of Water Permits f COMMONWEALTH of VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY Street address:629 East Main Street,Richmond,Virginia 23219 Molly Joseph Ward Mailing address:P.O.Box 1105,Richmond,Virginia 23218 David K.Paylor Secretary of Natural Resources Fax: 804-6984019-TDD(804)6984021 Director www.deq.virginia.gov (804)698-4020 July 25,2014 1-800-592-5482 North Pointe Charlottesville LLC 2619 Hydraulic Rd Charlottesville, VA 22901 RE: Coverage under the 2014 VPDES Construction General Permit(VAR10) General Permit No.VAR10C806 North Pointe Development Private- ResidentialCommercial-Mixed Use Community Dear Permittee: DEQ has reviewed your Registration Statement received on May 6, 2014 and determined that the proposed land-disturbing activity is covered under the General VPDES Permit for Discharges of Stormwater from Construction Activities(VAR10). The effective date of your coverage under this general permit is the date of this letter. A copy of the general permit can be obtained from DEQ's webpage at the following location: http:Uwww.deg.virginia.aov/Portals/01DEQNVater/Publications/CGP2014.pdf: The general permit contains the applicable Stormwater Pollution Prevention Plan (SWPPP) requirements and other conditions of coverage. Please print the general permit and read it carefully as you will be responsible for compliance with all permit conditions. The general permit requires that you update your SWPPP to incorporate the changes that the Department made for this permit reissuance. Please update the SWPPP as soon as possible but no later than sixty(60)days from the date of this letter. • DEQ staff has determined that the proposed land-disturbing activity will discharge to a surface water identified as impaired or for which a TMDL wasteload allocation has been established and approved prior to the term of the general permit for (i)sediment or a sediment-related parameter or(ii) nutrients. Therefore, the following general permit(Part I.B.4)and SWPPP requirements(Part lt.A.5) must be implemented for the land-disturbing activity: • Permanent or temporary soil stabilization shall be applied to denuded areas within seven (7) days after final grade is reached on any portion of the site; • Nutrients (e.g., fertilizers) shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; • Inspections shall be conducted at a frequency of(i) at least once every four (4) business days or (ii) at least once every(5) business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and • Representative inspections used by utility line installation, pipeline construction, or other similar linear • construction activities shall inspect all outfalls. Page 2 of 2 General Permit No.VAR10C806 North Pointe Development The general permit will expire on June 30, 2019. The conditions of the general permit require that you submit a new registration statement at least 90 days prior to that date if you wish to continue coverage under the general permit, unless permission for a later date has been granted by the Board. Permission cannot be granted to submit the registration statement after the expiration date of the general permit. If you have any questions about this permit, please contact the DEQ Office of Stormwater Management at ConstructionGPCcDdea.virginia.aov. Sincerely, Frederick K.Cunningham, Director Office of Water Permits Section 3. Nature of activity The North Pointe Development is proposed to be a multi use residential/commercial development. The proposed work will involve the construction of the road network shown on the Modified Zoning Plan along with the associated storm sewer, waterline, sanitary sewer and stormwater management and best management practice facilities to service the North Pointe Development. The construction will occur in phases. The first phase of land disturbing activities will involve the construction of the sanitary sewer extension along U.S. Route 29. Phase 2 will involve the construction of the Middle Entrance Road and associated utilities and U.S. 29 improvements. Phase 3 will involve the construction of the road network that will serve the single family detached houses. Future sections will be dependent upon the market conditions. The proposed Construction Phase is Phase 2 are as follows(this section will be updated as future phases are added to the SWPPP): Phase 2—North Pointe Middle Entrance and Route 29 Improvements: This project involves the construction of North Pointe Middle and Southern entrances and the associated Route 29 improvements which includes the construction of the required turn lanes and superstreet to satisfy VDOT's requirements. The project also involves the construction of SWM/BMP basin 2 shown on the North Pointe zoning case application plan. The SWM/BMP has been designed to address the water quality and quantity associated with a portion of the middle entrance road and the future commercial sites north and south of the middle entrance road. Water and sanitary sewer will be extended to service the future north pointe developments. The disturbed area associated with this project is 16.10 acres. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County Section 4. 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' 2 I 1111' ma m.. I t 1( (_, WI £ E 6 445 0000 l ) ♦ I... // ll/ : .• �� ♦♦ it% / / ' 1....--- - z.v. ' - a� A14'1., i h 1,,,pI a t '', ,i) i 106, , I Y ', 4 / . r I4. �,- s < {} SII j, 1,i,t$;i t ii w.a�vr.p:m:,:�wrcertiznasona e.,,woe,nw«,.�en.....,m.a.,.ionrz,mrsm,:i Section 5. Stormwater Management Plan North Pointe—Middle Entrance and Route 29 Road Improvements This project involves the disturbance of 16.1 acres. A SWM/BMP (SWM 2 on the approved Zoning Application plan) is proposed with this project to address the Stormwater Management and CBPA requirements for the project area. The basin will act as a sediment basin during construction to address the sediment control needs for the current and future construction sites and it will be converted to a permanent SWM/BMP facility after the upslope land activities are complete and upstream sites are stabilized. The SWM/BMP facility has been designed to control the post development 2 and 10 year storm events to reduce the post developed runoffs to the 2 and 10 year storm events pre-developed rates. The SWM/BMP is designed to meet the water quality requirement for the future commercial sites. The anticipated removal requirement for the future sites is 4.58 pounds/year. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County North Pointe Middle Entrance SWM/BMP 2 -Compliance Storm Pre-Development Flow Allowable Post Computed Post Elevation Event Development Flow Devlopment Runoff From SWM/BMP (yr) (cfs) (cfs) (cfs) (ft) 2 Year 1.53 1.53 1.07 435.03 Storm 10 Year 7.63 7.63 4.19 436.16 Storm 100 Year 25.31 N/A 52.8 436.97 Storm PERFORMANCE-BASED WATER QUALITY CALCULATIONS APPENDIX 5D Worksheet 1 Page 1 of 3 STEP 1 Determine the applicable area(A) and the post-developed impervious cover apos)• Applicable area(A)* = 11 .17 acres Applicable Area Breakdown: -Middle Entrance Road 1.26 Post-development impervious cover: acres; anticipated79% impervious - Commercial sites 9.91 acres; structures = acres 30% anticipated impervious area parking lot = acres roadway = acres other: = acres acres Total = acres 'post=(total post-development impervious cover±A) X 100= 36 * The area subject to the criteria may vary from locality to locality. Therefore, consult the locality for proper determination of this value. STEP 2 Determine the average land cover condition (Iwatershed) or the existing impervious cover(Iexisting)• Average land cover condition('wateiahed) If the locality has determined land cover conditions for individual watersheds within its jurisdiction,use the watershed specific value determined by the locality as Iwatershed• __ 16 'watershed /0 Otherwise,use the Chesapeake Bay default value: 'watershed = 16°/0 5D-5 PERFORMANCE-BASED WATER QUALITY CALCULATIONS APPENDIX 5D Worksheet 1 l Page 2 of 3 Existing impervious cover(Listing): Determine the existing impervious cover of the development site if present. Existing impervious cover: structures = acres parking lot = acres roadway = acres other: acres acres Total = 0' acres 'existing=(total existing impervious cover 4-A*) x 100= 0.0 * The area should be the same as used in STEP 1. STEP 3 Determine the appropriate development situation. The site information determined in STEP 1 and STEP 2 provide enough information to determine the appropriate development situation under which the performance criteria will apply. Check( )the appropriate development situation as follows: Situation 1: This consists of land development where the existing percent impervious cover(Iexisting)is less than or equal to the average land cover condition °watershed)and the proposed improvements will create a total percent impervious cover(Ipo5)which is less than or equal to the average land cover condition(Iwatershed)• Ipost % 'watershed 5D-6 PERFORMANCE-BASED WATER QUALITY CALCULATIONS APPENDIX 5D Worksheet 1 Page 3 of 3 X Situation 2: This consists of land development where the existing percent impervious cover(Iexisting) is less than or equal to the average land cover condition ('watershed) and the proposed improvements will create a total percent impervious cover(Ipost)which is greater than the average land cover condition(Iwatershed)• 'existing 0.0 % <Iwatershed 16 %; and post 36 % >/watershed 16 Situation 3: This consists of land development where the existing percent impervious cover(Iexisting) is greater than the average land cover condition(Iwatershed)• o existing o o)/watershed io Situation 4: This consists of land development where the existing percent impervious cover(Iexisting) is served by an existing stormwater management BMP(s) that addresses water quality. If the proposed development meets the criteria for development Situation 1,than the low density development is considered to be the BMP and no pollutant removal is required. The calculation procedure for Situation 1 stops here. If the proposed development meets the criteria for development Situations 2,3,or 4,then proceed to STEP 4 on the appropriate worksheet. 5D-7 PERFORMANCE-BASED WATER QUALITY CALCULATIONS APPENDIX 5D Worksheet 2 : Situation 2 Page 1 of 4 Summary of Situation 2 criteria: from calculation procedure STEP 1 thru STEP 3, Worksheet 1: Applicable area(A)* = 11 .17 acres Ipost =(total post-development impervious cover-A) x 100= 36 16 0 'watershed = /o or 'watershed = 16% 'existing=(total existing impervious cover_A*) x 100= 0.0 0.0 0 16 'existing 0 < 'watershed %; and Ipost 36 °/0>'watershed 1 6 p/0 STEP 4 Determine the relative pre-development pollutant load(Lpre). Lpretwatershed)_ [0.05 +(0.009 x 'watershed)] x A x 2.28 (Equation 5-16) where: Lpre(watershed) = relative pre-development total phosphorous load(pounds per year) 'watershed = average land cover condition for specific watershed or locality or the Chesapeake Bay default value of 16% (percent expressed in whole numbers) A = applicable area(acres) Lpretwatershed)= [0.05 + (0.009 x 16 )ix 11 .17 x 2.28 4.94 pounds per year 5D-9 PERFORMANCE-BASED WATER QUALITY CALCULATIONS APPENDIX 5D Worksheet 2 : Situation 2 Page 2 of 4 STEP 5 Determine the relative post-development pollutant load(Lpst). Lpost = [0.05 + (0.009 x Ipost)] x A x 2.28 (Equation 5-21) where: Lpost = relative post-development total phosphorous load(pounds per year) Ipost = post-development percent impervious cover(percent expressed in whole numbers) A = applicable area(acres) Lpost = [0.05 + (0.009 x 36 )] x 11 •17 x 2.28 9.52 = pounds per year STEP 6 Determine the relative pollutant removal requirement(RR). RR = Lpost - Lpre(watershed) = 9.52 _ 4.94 4.58 pounds per year STEP 7 Identify best management practice(BMP)for the site. 1. Determine the required pollutant removal efficiency for the site: EFF = (RR-Lp.st) x 100 (Equation 5-22) where: EFF = required pollutant removal efficiency(percent expressed in whole numbers) RR = pollutant removal requirement(pounds per year) Lpost = relative post-development total phosphorous load(pounds per year) EFF = ( 4.58 _ 9.52 ) x 100 48 5D-10 PERFORMANCE-BASED WATER QUALITY CALCULATIONS APPENDIX 5D Worksheet 2 : Situation 2 Page 3 of 4 2. Select BMP(s) from Table 5-15 and locate on the site: BMP L• Retention basin II (4 x WQ Vol) BMP 2: BMP 3: 3. Determine the pollutant load entering the proposed BMP(s): LBMP = [0.05 + (0.009 x IBMp)] x A x 2.28 (Equation 5-23) where: LBMP = relative post-development total phosphorous load entering proposed BMP (pounds per year) IBMP = post-development percent impervious cover of BMP drainage area (percent expressed in whole numbers) A = drainage area of proposed BMP(acres) LBMPi = [0.05 + (0.009 x 50 )] x 8.83 x 2.28 9.17 pounds per year LBMp2 = [0.05 +(0.0(9 x )] x x 2.28 pounds per year LBMP3 = [0.05 + (0.009 x )] x x 2.28 = pounds per year 5D-11 PERFORMANCE-BASED WATER QUALITY CALCULATIONS APPENDIX 5D Worksheet 2 : Situation 2 Page 4 of 4 4. Calculate the pollutant load removed by the proposed BMP(s): Lremoved = EffBMP X LBMP (Equation 5-24) where: Lremoved = Post-development pollutant load removed by proposed BMP (pounds per year) EffBMP = pollutant removal efficiency of BMP (expressed in decimal form) LBMP = relative post-development total phosphorous load entering proposed BMP (pounds per year) 50 9.17 4.58 LremovedBMP1 = X = pounds per year Lremoved/BMP2 = x = pounds per year Lremoved/BMP3 = X = pounds per year 5. Calculate the total pollutant load removed by the BMP(s): Lremoved/tow = Lremoved/BMP1 +Lremoved/BMP2+Lremoved/BMP3 + • . . (Equation 5-25) where: Lremoved/tow =total pollutant load removed by proposed BMPs Lremoved/BMP1 =pollutant load removed by proposed BMP No. 1 Lremoved/BMP2=pollutant load removed by proposed BMP No. 2 LremovedBMP3 =pollutant load removed by proposed BMP No. 3 4.58 Lremoved/total = + + + . . . 4.58 = pounds per year 6. Verify compliance: Lremoved/total RR 4.58 4.58 Water Quality Volume Calculations: Anticipated future Impervious Area = 4.0 Acres VWQ(ft3) = 4.00 (AC) x 43560 x 0.5 / 12 = 7,260 ft3 4 x VWQ(ft3) = 29,040 ft3 5D-12 3S Ultima e Post Devel pment SWM/BMP 2 Subca Reachl 'on• Routing Diagram for NP SWM-BMP 2 Prepared by TOWNES SITE ENGINEERING, Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 2 Time span=5.00-120.00 hrs,dM/05 hrs,2301 points Runoff by SCS TR-20 method,UH=SCS,Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 3S: Ultimate Post Development Runoff Area=8.830 ac 45.30%Impervious Runoff Depth=1.59" Flow Length=1,060' Tc=13.3 min CN=78 Runoff 19.01 cfs 1.169 af Pond 2: SWM/B1VIP 2 Peak Elev=435.03' Storage=96,488 cf Inflow=19.01 cfs 1.169 af Primary=1.07 cfs 1.387 af Secondary=0.00 cfs 0.000 af Outflow=1.07 cfs 1.387 af Total Runoff Area=8.830 ac Runoff Volume=1.169 af Average Runoff Depth=1.59" 54.70%Pervious=4.830 ac 45.30%Impervious=4.000 ac You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 3S: Ultimate Post Development Runoff = 19.01 cfs @ 12.06 hrs, Volume= 1.169 af, Depth= 1.59" Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=5.00-120.00 hrs,dt=0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area(ac) CN Description * 4.000 98 Anticipated Impervious Area(B-Soils) * 4.830 61 Anticipated open space pervious area(B-Soils) 8.830 78 Weighted Average 4.830 54.70%Pervious Area 4.000 45.30%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.5 50 0.0330 0.09 Sheet Flow,Sheet Flow Woods: Light underbrush n=0.400 P2=3.62" 2.7 550 0.0500 3.35 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 1.1 460 0.0200 6.79 325.70 Channel Flow, Area=48.0 sf Perim=23.4' r=2.05' n=0.050 Mountain streams w/large boulders 13.3 1,060 Total Subcatchment 3S: Ultimate Post Development Hydrograph 2L 19.01 cfs _I Runoff 18 a Type II 24-hr 16 2-Year Rainfall=3.62" Runoff Area=8.830 ac N 14= Runoff Volume=1.169 af 12 : Runoff Depth=1.59" 0 10_ Flow Length=1,060' 8= Tc=13.3 min 6 CN=78 4= 2 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP SWM-BMP 2 Type II 24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 4 Hydrograph for Subcatchment 3S: Ultimate Post Development Time Precip. Excess Runoff Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 56.00 3.62 1.59 0.00 107.00 3.62 1.59 0.00 6.00 0.29 0.00 0.00 57.00 3.62 1.59 0.00 108.00 3.62 1.59 0.00 7.00 0.36 0.00 0.00 58.00 3.62 1.59 0.00 109.00 3.62 1.59 0.00 8.00 0.43 0.00 0.00 59.00 3.62 1.59 0.00 110.00 3.62 1.59 0.00 9.00 0.53 0.00 0.00 60.00 3.62 1.59 0.00 111.00 3.62 1.59 0.00 10.00 0.66 0.00 0.05 61.00 3.62 1.59 0.00 112.00 3.62 1.59 0.00 11.00 0.85 0.03 0.31 62.00 3.62 1.59 0.00 113.00 3.62 1.59 0.00 12.00 2.40 0.72 16.57 63.00 3.62 1.59 0.00 114.00 3.62 1.59 0.00 13.00 2.79 0.99 1.58 64.00 3.62 1.59 0.00 115.00 3.62 1.59 0.00 14.00 2.97 1.11 0.93 65.00 3.62 1.59 0.00 116.00 3.62 1.59 0.00 15.00 3.09 1.19 0.73 66.00 3.62 1.59 0.00 117.00 3.62 1.59 0.00 16.00 3.19 1.26 0.57 67.00 3.62 1.59 0.00 118.00 3.62 1.59 0.00 17.00 3.26 1.32 0.50 68.00 3.62 1.59 0.00 119.00 3.62 1.59 0.00 18.00 3.33 1.37 0.44 69.00 3.62 1.59 0.00 120.00 3.62 1.59 0.00 19.00 3.39 1.42 0.39 70.00 3.62 1.59 0.00 20.00 3.45 1.46 0.33 71.00 3.62 1.59 0.00 21.00 3.49 1.49 0.31 72.00 3.62 1.59 0.00 22.00 3.54 1.53 0.30 73.00 3.62 1.59 0.00 23.00 3.58 1.56 0.29 74.00 3.62 1.59 0.00 24.00 3.62 1.59 0.28 75.00 3.62 1.59 0.00 25.00 3.62 1.59 0.00 76.00 3.62 1.59 0.00 26.00 3.62 1.59 0.00 77.00 3.62 1.59 0.00 27.00 3.62 1.59 0.00 78.00 3.62 1.59 0.00 28.00 3.62 1.59 0.00 79.00 3.62 1.59 0.00 29.00 3.62 1.59 0.00 80.00 3.62 1.59 0.00 30.00 3.62 1.59 0.00 81.00 3.62 1.59 0.00 31.00 3.62 1.59 0.00 82.00 3.62 1.59 0.00 32.00 3.62 1.59 0.00 83.00 3.62 1.59 0.00 33.00 3.62 1.59 0.00 84.00 3.62 1.59 0.00 34.00 3.62 1.59 0.00 85.00 3.62 1.59 0.00 35.00 3.62 1.59 0.00 86.00 3.62 1.59 0.00 36.00 3.62 1.59 0.00 87.00 3.62 1.59 0.00 37.00 3.62 1.59 0.00 88.00 3.62 1.59 0.00 38.00 3.62 1.59 0.00 89.00 3.62 1.59 0.00 39.00 3.62 1.59 0.00 90.00 3.62 1.59 0.00 40.00 3.62 1.59 0.00 91.00 3.62 1.59 0.00 41.00 3.62 1.59 0.00 92.00 3.62 1.59 0.00 42.00 3.62 1.59 0.00 93.00 3.62 1.59 0.00 43.00 3.62 1.59 0.00 94.00 3.62 1.59 0.00 44.00 3.62 1.59 0.00 95.00 3.62 1.59 0.00 45.00 3.62 1.59 0.00 96.00 3.62 1.59 0.00 46.00 3.62 1.59 0.00 97.00 3.62 1.59 0.00 47.00 3.62 1.59 0.00 98.00 3.62 1.59 0.00 48.00 3.62 1.59 0.00 99.00 3.62 1.59 0.00 49.00 3.62 1.59 0.00 100.00 3.62 1.59 0.00 50.00 3.62 1.59 0.00 101.00 3.62 1.59 0.00 51.00 3.62 1.59 0.00 102.00 3.62 1.59 0.00 52.00 3.62 1.59 0.00 103.00 3.62 1.59 0.00 53.00 3.62 1.59 0.00 104.00 3.62 1.59 0.00 54.00 3.62 1.59 0.00 105.00 3.62 1.59 0.00 55.00 3.62 1.59 0.00 106.00 3.62 1.59 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type 1124-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 5 Summary for Pond 2: SWM/BMP 2 Inflow Area= 8.830 ac, 45.30% Impervious, Inflow Depth= 1.59" for 2-Year event Inflow = 19.01 cfs @ 12.06 hrs, Volume= 1.169 af Outflow = 1.07 cfs @ 13.70 hrs, Volume= 1.387 af, Atten=94%, Lag=98.6 min Primary = 1.07 cfs @ 13.70 hrs, Volume= 1.387 of Secondary= 0.00 cfs @ 5.00 his, Volume= 0.000 af Routing by Stor-hid method,Time Span=5.00-120.00 hrs,dt=0.05 his Starting Elev=434.00' Surf.Area= 19,411 sf Storage=75,477 cf Peak Elev=435.03' @ 13.70 his Surf.Area=21,321 sf Storage=96,488 cf (21,011 cf above start) Plug-Flow detention time=(not calculated:initial storage exceeds outflow) Center-of-Mass det.time=355.8 min( 1,202.0-846.1 ) Volume Invert Avail.Storage Storage Description #1 429.00' 168,310 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 429.00 11,005 0 0 430.00 12,569 11,787 11,787 431.00 14,201 13,385 25,172 432.00 15,881 15,041 40,213 433.00 17,618 16,750 56,963 \ 1 434.00 19,411 18,515 75,477 �^SS 435.00 21,261 20,336 95,813 r` v 436.00 23,167 22,214 118,027 .. r 437.00 25,129 24,148 142,175 ') A v 438.00 27,140 26,135 168,310 �✓ Device Routing Invert Outlet Devices #1 Primary 429.00' 30.0" Round Culve, L=82.3'/RCP,square edge headwall, Ke=0.500 Inlet/Outlet Invert= 9.00' / 7.00' S=0.0243 '/' Cc=0.900 n=0.013, Flow Area=• • #2 Device 1 433.50' 6.0"Vert.Orifice Cr 0.600 #3 Device 1 436.00' 48.0"Horiz.Riser C=0.600 Limited to weir flow at low heads #4 Secondary 436.50' Emergency Spillway,Cv=2.68(C=3.35) Head(feet) 0.00 1.50 Width(feet) 10.00 19.00 Primary Outflow Max=1.07 cfs @ 13.70 his HW=435.03' (Free Discharge) "Culvert (Passes 1.07 cfs of 51.68 cfs potential flow) 2 Orifice (Orifice Controls 1.07 cfs @ 5.45 fps) 3=Riser (Controls 0.00 cfs) §econdary Outflow Max�.00 cfs @ 5.00 his HW=434.00' (Free Discharge) 4=Emergency Spillway (Controls 0.00 cfs) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NPSWM-BMP 2 Type II 24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 6 Pond 2: SWM/BMP 2 Hydrograph 19.01 cfs II Inflow / Inflow Area=8.830 ac C Outflow 20-7 Peak Elev=435.03' ■ Primary 18= Storage=96,488 cf _❑ Secondary 16 "07 14 = 12 _ 3 10 0 u 8-= 6= n7 _r 4 1.07 cfs 0.00 cfs 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond 2: SWM/BMP 2 Stage-Discharge �.�r',/'a,,rr,�rrrr►/'�n'' ❑ Total 438 A,,�.�►Advoir .. III Primary 437 _i'' Emergency Spillway ❑ Secondary 436 d 435 C 434 • 1 433 w 432 7, 431 430. r' Elm 429 , , , 0 50 100 Discharge (cfs) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 7 Pond 2: SWMIBMP 2 Stage-Area-Storage Surface/Horizontal/Wetted Area (sq-ft) D Surface 0 5,000 10,000 15,000 20,000 25,000 I Storage 438 437 436 11 435 Starting Elevation c 434 7-; 433 a 432 431E 430Z____SLStage Data429 0 50,000 100,000 150,000 Storage (cubic-feet) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 8 Hydrograph for Pond 2: SWM/BMP 2 Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs) 5.00 0.00 75,477 434.00 0.47 0.47 0.00 7.50 0.00 72,176 433.83 0.27 0.27 0.00 10.00 0.05 70,407 433.74 0.15 0.15 0.00 12.50 3.04 1 94,107 434.92 1.02 1.02 0.00 15.00 0.73 1 95,510 434.99 1.05 1.05 0.00 17.50 0.47 1 91,527 434.80 0.97 0.97 0.00 20.00 0.33 86,909 434.57 0.86 0.86 0.00 22.50 0.29 82,496 434.36 0.74 0.74 0.00 25.00 0.00 78,190 434.14 0.59 0.59 0.00 27.50 0.00 73,815 433.91 0.38 0.38 0.00 30.00 0.00 71,262 433.78 0.21 0.21 0.00 32.50 0.00 69,839 433.71 0.12 0.12 0.00 35.00 0.00 68,984 433.66 0.08 0.08 0.00 37.50 0.00 68,402 433.63 0.05 0.05 0.00 40.00 0.00 67,995 433.61 0.04 0.04 0.00 42.50 0.00 67,711 433.59 0.03 0.03 0.00 45.00 0.00 67,498 433.58 0.02 0.02 0.00 47.50 0.00 67,312 433.57 0.02 0.02 0.00 50.00 0.00 67,150 433.56 0.02 0.02 0.00 52.50 0.00 67,007 433.55 0.01 0.01 0.00 55.00 0.00 66,882 433.55 0.01 0.01 0.00 57.50 0.00 66,772 433.54 0.01 0.01 0.00 60.00 0.00 66,676 433.54 0.01 0.01 0.00 62.50 0.00 66,592 433.53 0.01 0.01 0.00 65.00 0.00 66,518 433.53 0.01 0.01 0.00 67.50 0.00 1 66,454 433.52 0.01 0.01 0.00 70.00 0.00 66,397 433.52 0.01 0.01 0.00 72.50 0.00 ' 66,347 433.52 0.01 0.01 0.00 75.00 0.00 66,304 433.52 0.00 0.00 0.00 77.50 0.00 66,266 433.51 0.00 0.00 0.00 80.00 0.00 66,232 433.51 0.00 0.00 0.00 82.50 0.00 66,203 433.51 0.00 0.00 0.00 85.00 0.00 66,177 433.51 0.00 0.00 0.00 87.50 0.00 66,155 433.51 0.00 0.00 0.00 90.00 0.00 66,135 433.51 0.00 0.00 0.00 92.50 0.00 66,118 433.51 0.00 0.00 0.00 95.00 0.00 66,103 433.51 0.00 0.00 0.00 97.50 0.00 66,090 433.51 0.00 0.00 0.00 100.00 0.00 66,078 433.50 0.00 0.00 0.00 102.50 0.00 66,068 433.50 0.00 0.00 0.00 105.00 0.00 66,059 433.50 0.00 0.00 0.00 107.50 0.00 66,051 433.50 0.00 0.00 0.00 110.00 0.00 66,044 433.50 0.00 0.00 0.00 112.50 0.00 66,038 433.50 0.00 0.00 0.00 115.00 0.00 66,033 433.50 0.00 0.00 0.00 117.50 0.00 66,028 433.50 0.00 0.00 0.00 120.00 0.00 66,024 433.50 0.00 0.00 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 9 Stage-Discharge for Pond 2: SWM/BMP 2 Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary (feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs) 429.00 0.00 0.00 0.00 434.10 0.56 0.56 0.00 429.10 0.00 0.00 0.00 434.20 0.63 0.63 0.00 429.20 0.00 0.00 0.00 434.30 0.70 0.70 0.00 429.30 0.00 0.00 0.00 434.40 0.76 0.76 0.00 429.40 0.00 I 0.00 0.00 434.50 0.82 0.82 0.00 429.50 0.00 0.00 0.00 434.60 0.87 0.87 0.00 429.60 0.00 0.00 0.00 434.70 0.92 0.92 0.00 429.70 0.00 0.00 0.00 434.80 0.97 0.97 0.00 429.80 0.00 0.00 0.00 434.90 1.01 1.01 0.00 429.90 0.00 0.00 0.00 435.00 1.06 1.06 0.00 430.00 0.00 0.00 0.00 435.10 1.10 1.10 0.00 430.10 0.00 0.00 0.00 435.20 1.14 1.14 0.00 430.20 0.00 0.00 0.00 435.30 1.18 1.18 0.00 430.30 0.00 0.00 0.00 435.40 1.21 1.21 0.00 430.40 0.00 0.00 0.00 435.50 1.25 1.25 0.00 430.50 0.00 0.00 0.00 435.60 1.29 1.29 0.00 430.60 0.00 0.00 0.00 435.70 1.32 1.32 0.00 430.70 0.00 0.00 0.00 435.80 1.35 1.35 0.00 430.80 0.00 0.00 0.00 435.90 1.39 1.39 0.00 430.90 0.00 0.00 0.00 436.00 1.42 1.42 0.00 431.00 0.00 0.00 0.00 436.10 2.75 2.75 0.00 431.10 0.00 0.00 0.00 436.20 5.16 5.16 0.00 431.20 0.00 0.00 0.00 436.30 8.26 8.26 0.00 431.30 0.00 0.00 0.00 436.40 11.93 11.93 0.00 431.40 0.00 0.00 0.00 436.50 16.10 16.10 0.00 431.50 0.00 0.00 0.00 436.60 21.78 20.69 1.08 431.60 0.00 0.00 0.00 436.70 28.83 25.69 3.14 431.70 0.00 0.00 0.00 436.80 36.96 31.05 5.90 431.80 0.00 0.00 0.00 436.90 46.05 36.76 9.29 431.90 0.00 0.00 0.00 437.00 56.06 42.80 13.27 432.00 0.00 0.00 0.00 437.10 66.95 49.14 17.81 432.10 0.00 0.00 0.00 437.20 78.69 55.77 22.92 432.20 0.00 0.00 0.00 437.30 91.26 62.69 28.57 432.30 0.00 0.00 0.00 437.40 97.98 63.20 34.78 432.40 0.00 0.00 0.00 437.50 105.18 63.64 41.54 432.50 0.00 0.00 0.00 437.60 112.93 64.08 48.85 432.60 0.00 0.00 0.00 437.70 121.23 64.51 56.72 432.70 0.00 0.00 0.00 437.80 130.09 64.94 65.15 432.80 0.00 0.00 0.00 437.90 139.51 65.37 74.14 432.90 0.00 0.00 0.00 438.00 149.50 65.80 83.70 433.00 0.00 0.00 0.00 433.10 0.00 0.00 0.00 433.20 0.00 0.00 0.00 433.30 0.00 0.00 0.00 433.40 0.00 0.00 0.00 433.50 0.00 0.00 0.00 433.60 0.03 0.03 0.00 433.70 0.11 0.11 0.00 433.80 0.23 0.23 0.00 433.90 0.36 0.36 0.00 434.00 0.47 0.47 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) �s it J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 2-Year Rain Prepared by TOWNES SITE ENGINEERING Printed "two ° HydroCAD®10.00-12 sin 06356 ©2014 HydroCAD Software Solutions LLC Page 10 Stage-Area-Storage for Pond 2: SWM/BMP 2 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 429.00 11,005 0 434.10 19,596 77,427 429.10 11,161 1,108 434.20 19,781 79,396 429.20 11,318 2,232 434.30 19,966 81,384 429.30 11,474 3,372 434.40 20,151 83,389 429.40 11,631 4,527 434.50 20,336 85,414 429.50 11,787 5,698 434.60 20,521 87,457 429.60 11,943 6,885 434.70 20,706 89,518 429.70 12,100 8,087 434.80 20,891 91,598 429.80 12,256 9,304 434.90 21,076 93,696 429.90 12,413 10,538 435.00 21,261 95,813 430.00 12,569 11,787 435.10 21,452 97,949 430.10 12,732 13,052 435.20 21,642 100,103 430.20 12,895 14,333 435.30 21,833 102,277 430.30 13,059 15,631 435.40 22,023 104,470 430.40 13,222 16,945 435.50 22,214 106,682 430.50 13,385 18,276 435.60 22,405 108,913 430.60 13,548 '', 19,622 435.70 22,595 111,163 430.70 13,711 20,985 435.80 22,786 113,432 430.80 13,875 22,364 435.90 22,976 115,720 430.90 14,038 23,760 436.00 23,167 118,027 431.00 14,201 25,172 436.10 23,363 120,354 431.10 14,369 26,601 436.20 23,559 122,700 431.20 14,537 28,046 436.30 23,756 125,065 431.30 14,705 29,508 436.40 23,952 127,451 431.40 14,873 30,987 436.50 24,148 129,856 431.50 15,041 32,483 436.60 24,344 132,280 431.60 15,209 33,995 436.70 24,540 134,725 431.70 15,377 35,524 436.80 24,737 137,188 431.80 15,545 37,070 436.90 24,933 139,672 431.90 15,713 38,633 437.00 25,129 142,175 432.00 15,881 40,213 437.10 25,330 144,698 432.10 16,055 41,810 437.20 25,531 147,241 432.20 16,228 43,424 437.30 25,732 149,804 432.30 16,402 45,055 437.40 25,933 152,387 432.40 16,576 46,704 437.50 26,135 154,991 432.50 16,750 48,371 437.60 26,336 157,614 432.60 16,923 50,054 437.70 26,537 160,258 432.70 17,097 51,755 437.80 26,738 162,922 432.80 17,271 53,474 437.90 26,939 165,606 432.90 17,444 55,209 438.00 27,140 168,310 433.00 17,618 56,963 433.10 17,797 58,733 433.20 17,977 60,522 433.30 18,156 62,329 433.40 18,335 64,153 433.50 18,515 65,996 433.60 18,694 67,856 433.70 18,873 69,734 433.80 19,052 71,631 433.90 19,232 73,545 434.00 19,411 75,477 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) vnft� /(1 J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 10-Year Rainf Prepared by TOWNES SITE ENGINEERING Printed 1 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 11 Time span=5.00-120.00 hrs,dt .).05 hrs,2301 points Runoff by SCS TR-20 method,UH=SCS,Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 3S:Ultimate Post Development Runoff Area=8.830 ac 45.30%Impervious Runoff Depth=3.11" Flow Length=1,060' Tc=13.3 min CN=78 Runoff=37.24 cfs 2.286 af Pond 2: SWM/BMP 2 Peak Elev=436.16' Storage=121,771 cf Inflow=37.24 cfs 2.286 af Primary=4.19 cfs 2.503 af Secondary=0.00 cfs 0.000 af Outflow=4.19 cfs 2.503 af Total Runoff Area=8.830 ac Runoff Volume=2.286 af Average Runoff Depth=3.11" 54.70%Pervious=4.830 ac 45.30%Impervious=4.000 ac You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP SWM-BMP 2 Type II24-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 sin 06356 ©2014 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 3S: Ultimate Post Development Runoff = 37.24 cfs @ 12.05 hrs, Volume= 2.286 af, Depth= 3.11" Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=5.00-120.00 hrs,dt=0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area(ac) CN Description * 4.000 98 Anticipated Impervious Area(B-Soils) * 4.830 61 Anticipated open space pervious area(B-Soils) 8.830 78 Weighted Average 4.830 54.70%Pervious Area 4.000 45.30%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.5 50 0.0330 0.09 Sheet Flow,Sheet Flow Woods:Light underbrush n=0.400 P2=3.62" 2.7 550 0.0500 3.35 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 1.1 460 0.0200 6.79 325.70 Channel Flow, Area=48.0 sf Perim=23.4' r=2.05' n=0.050 Mountain streams w/large boulders 13.3 1,060 Total Subcatchment 3S: Ultimate Post Development Hydrograph A 4( 37.24 cfs S Runoff II Type II 24-hr 35 10-Year Rainfall=5.46" 30 Runoff Area=8.830 ac 25 Runoff Volume=2.286 af = Runoff Depth=3.11" c 20: Flow Length=1,060' " 15= Tc=13.3 min 10- CN=78 5 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 13 Hydrograph for Subcatchment 3S: Ultimate Post Development Time Precip. Excess Runoff Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) i (cfs) (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.34 0.00 0.00 56.00 5.46 3.11 0.00 107.00 5.46 3.11 0.00 6.00 0.44 0.00 0.00 57.00 5.46 3.11 0.00 108.00 5.46 3.11 0.00 7.00 0.54 0.00 0.00 58.00 5.46 3.11 0.00 109.00 5.46 3.11 0.00 8.00 0.66 0.00 0.05 59.00 5.46 3.11 0.00 110.00 5.46 3.11 0.00 9.00 0.80 0.02 0.19 60.00 5.46 3.11 0.00 111.00 5.46 3.11 0.00 10.00 0.99 0.06 0.40 61.00 5.46 3.11 0.00 112.00 5.46 3.11 0.00 11.00 1.28 0.15 1.05 62.00 5.46 3.11 0.00 113.00 5.46 3.11 0.00 12.00 3.62 1.59 33.35 63.00 5.46 3.11 0.00 114.00 5.46 3.11 0.00 13.00 4.22 2.06 2.81 64.00 5.46 3.11 0.00 115.00 5.46 3.11 0.00 14.00 4.48 2.27 1.64 65.00 5.46 3.11 0.00 116.00 5.46 3.11 0.00 15.00 4.66 2.43 1.27 66.00 5.46 3.11 0.00 117.00 5.46 3.11 0.00 16.00 4.80 2.55 1.00 67.00 5.46 3.11 0.00 118.00 5.46 3.11 0.00 17.00 4.92 2.65 0.86 68.00 5.46 3.11 0.00 119.00 5.46 3.11 0.00 18.00 5.03 2.74 0.76 69.00 5.46 3.11 0.00 120.00 5.46 3.11 0.00 19.00 5.12 2.81 0.66 70.00 5.46 3.11 0.00 20.00 5.20 2.88 0.56 71.00 5.46 3.11 0.00 21.00 5.27 2.94 0.53 72.00 5.46 3.11 0.00 22.00 5.33 3.00 0.51 73.00 5.46 3.11 0.00 23.00 5.40 3.05 0.49 74.00 5.46 3.11 0.00 24.00 5.46 3.11 0.47 75.00 5.46 3.11 0.00 25.00 5.46 3.11 0.00 76.00 5.46 3.11 0.00 26.00 5.46 3.11 0.00 77.00 5.46 3.11 0.00 27.00 5.46 3.11 0.00 78.00 5.46 3.11 0.00 28.00 5.46 3.11 0.00 79.00 5.46 3.11 0.00 29.00 5.46 3.11 0.00 80.00 5.46 3.11 0.00 30.00 5.46 3.11 0.00 81.00 5.46 3.11 0.00 31.00 5.46 3.11 0.00 82.00 5.46 3.11 0.00 32.00 5.46 3.11 0.00 83.00 5.46 3.11 0.00 33.00 5.46 3.11 0.00 84.00 5.46 3.11 0.00 34.00 5.46 3.11 0.00 85.00 5.46 3.11 0.00 35.00 5.46 3.11 0.00 86.00 5.46 3.11 0.00 36.00 5.46 3.11 0.00 87.00 5.46 3.11 0.00 37.00 5.46 3.11 0.00 88.00 5.46 3.11 0.00 38.00 5.46 3.11 0.00 89.00 5.46 3.11 0.00 39.00 5.46 3.11 0.00 90.00 5.46 3.11 0.00 40.00 5.46 3.11 0.00 91.00 5.46 3.11 0.00 41.00 5.46 3.11 0.00 92.00 5.46 3.11 0.00 42.00 5.46 3.11 0.00 93.00 5.46 3.11 0.00 43.00 5.46 3.11 0.00 94.00 5.46 3.11 0.00 44.00 5.46 3.11 0.00 95.00 5.46 3.11 0.00 45.00 5.46 3.11 0.00 96.00 5.46 3.11 0.00 46.00 5.46 3.11 0.00 97.00 5.46 3.11 0.00 47.00 5.46 3.11 0.00 98.00 5.46 3.11 0.00 48.00 5.46 3.11 0.00 99.00 5.46 3.11 0.00 49.00 5.46 3.11 0.00 100.00 5.46 3.11 0.00 50.00 5.46 3.11 0.00 101.00 5.46 3.11 0.00 51.00 5.46 3.11 0.00 102.00 5.46 3.11 0.00 52.00 5.46 3.11 0.00 103.00 5.46 3.11 0.00 53.00 5.46 3.11 0.00 104.00 5.46 3.11 0.00 54.00 5.46 3.11 0.00 105.00 5.46 3.11 0.00 55.00 5.46 3.11 0.00 106.00 5.46 3.11 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 14 Summary for Pond 2: SWM/BMP 2 Inflow Area= 8.830 ac, 45.30% Impervious, Inflow Depth= 3.11" for 10-Year event Inflow = 37.24 cfs @ 12.05 hrs, Volume= 2.286 af Outflow = 4.19 cfs I,@ 12.63 hrs, Volume= 2.503 af, Atten=89%, Lag=34.4 min Primary = 4.19 cfs j@ 12.63 hrs, Volume= 2.503 af Secondary= 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routing by Stor-Ind method,Time Span=5.00-120.00 hrs,dt=0.05 hrs Starting Elev=434.00' Sutf.Area=19,411 sf Storage=75,477 cf Peak Elev=436.16' @ 12.63 hrs Surf.Area=23,482 sf Storage=121,771 cf (46,294 cf above start) Plug-Flow detention time=1,189.9 min calculated for 0.771 af(34%of inflow) Center-of-Mass det.time=422.2 min( 1,249.0-826.9) Volume Invert A,rail.Storage Storage Description #1 429.00' 168,310 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 429.00 11,005 0 0 430.00 12,569 11,787 11,787 431.00 14,201 13,385 25,172 432.00 15,881 15,041 40,213 433.00 17,618 16,750 56,963 434.00 19,411 18,515 75,477 435.00 21,261 20,336 95,813 436.00 23,167 22,214 118,027 437.00 25,129 24,148 142,175 438.00 27,140 26,135 168,310 Device Routing Invert Outlet Devices #1 Primary 429.00' 30.0" Round Culvert L=82.3' RCP,square edge headwall, Ke=0.500 Inlet/Outlet Invert=429.00' /427.00' S=0.0243 '/' Cc=0.900 n=0.013, Flow Area=4.91 sf #2 Device 1 433.50' 6.0"Vert.Orifice C=0.600 #3 Device 1 436.00' 48.0"Horiz.Riser C=0.600 Limited to weir flow at low heads #4 Secondary 436.50' Emergency Spillway,Cv=2.68(C=3.35) Head(feet) 0.00 1.50 Width(feet) 10.00 19.00 rrimary Outflow Max-x.10 cfs @ 12.63 hrs HW=436.16' (Free Discharge) Avert (Passes 4.10 cfs of 57.46 cfs potential flow) 243rifice (Orifice Controls 1.47 cfs @ 7.48 fps) 3=Riser (Weir Controls 2.64 cfs @ 1.31 fps) §econdary Outflow Max=0.00 cfs @ 5.00 hrs HW=434.00' (Free Discharge) T 4=Emergency Spillway (Controls 0.00 cfs) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP SWM-BMP 2 Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 15 Pond 2: SWM/BMP 2 Hydrograph 37.24 cfs • Inflow Inflow Area=8. ac C 40 Peak Elev=436.16' Primary 35 Storage=121,830771 cf _ Outflowdary Secon 30 25 20 0 L 15 A do ..i 10 4.19 cfs .iiiiiiiiiiiiiiiiiiii,iiiiiiiiiii 0.00 cfs �` 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond 2: SWM/BMP 2 Stage-Discharge ,r,,mi►/' Total 438 A,,e,,ir..r/,'�` • Primary 437- tee" Emergency Spillway (l Secondary 436 435 = 434 j 1111, 433 tv w 432 431 430 429 0 50 100 Discharge (cfs) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 16 Pond 2: SWM/BMP 2 Stage-Area-Storage Surface/Horizontal/Wetted Area (sq-ft) Surface 0 5,000 10,000 15,000 20,000 25,000 4 Storage 438 437: 436 435 starting Elevation c 434 .."1"1'11#11°114.11°°1111111711.1°111111111#////// 433 co d 432 431 430 Custom Stage Data 429 0 50,000 100,000 150,000 Storage (cubic-feet) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 0 2014 HydroCAD Software Solutions LLC Page 17 Hydrograph for Pond 2: SWM/BMP 2 Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs) 5.00 0.00 75,477 434.00 0.47 0.47 0.00 7.50 0.01 72,179 433.83 0.27 0.27 0.00 10.00 0.40 71,599 433.80 0.23 0.23 0.00 12.50 5.52 121,443 436.15 3.84 3.84 0.00 15.00 1.27 118,276 436.01 1.48 1.48 0.00 17.50 0.81 114,537 435.85 1.37 1.37 0.00 20.00 0.56 108,776 435.59 1.28 1.28 0.00 22.50 0.50 102,391 435.31 1.18 1.18 0.00 25.00 0.00 95,251 434.97 1.05 1.05 0.00 27.50 0.00 86,704 434.56 0.85 0.85 0.00 30.00 0.00 79,929 434.23 0.65 0.65 0.00 32.50 0.00 74,977 433.97 0.45 0.45 0.00 35.00 0.00 71,896 433.81 0.25 0.25 0.00 37.50 0.00 70,205 433.72 0.14 0.14 0.00 40.00 0.00 69,213 433.67 0.09 0.09 0.00 42.50 0.00 68,561 433.64 0.06 0.06 0.00 45.00 0.00 68,106 433.61 0.04 0.04 0.00 47.50 0.00 67,789 433.60 0.03 0.03 0.00 50.00 0.00 67,561 433.58 0.02 0.02 0.00 52.50 0.00 67,368 433.57 0.02 0.02 0.00 55.00 0.00 67,198 433.56 0.02 0.02 0.00 57.50 0.00 67,049 433.56 0.02 0.02 0.00 60.00 0.00 66,919 433.55 0.01 0.01 0.00 62.50 0.00 66,805 433.54 0.01 0.01 0.00 65.00 0.00 66,705 433.54 0.01 0.01 0.00 67.50 0.00 66,617 433.53 0.01 0.01 0.00 70.00 0.00 66,540 433.53 0.01 0.01 0.00 72.50 0.00 66,473 433.53 0.01 0.01 0.00 75.00 0.00 66,414 433.52 0.01 0.01 0.00 77.50 0.00 66,362 433.52 0.01 0.01 0.00 80.00 0.00 66,317 433.52 0.00 0.00 0.00 82.50 0.00 66,277 433.52 0.00 0.00 0.00 85.00 0.00 66,242 433.51 0.00 0.00 0.00 87.50 0.00 66,212 433.51 0.00 0.00 0.00 90.00 0.00 66,185 433.51 0.00 0.00 0.00 92.50 0.00 66,162 433.51 0.00 0.00 0.00 95.00 0.00 66,141 433.51 0.00 0.00 0.00 97.50 0.00 66,123 433.51 0.00 0.00 0.00 100.00 0.00 66,107 433.51 0.00 0.00 0.00 102.50 0.00 66,094 433.51 0.00 0.00 0.00 105.00 0.00 66,081 433.50 0.00 0.00 0.00 107.50 0.00 66,071 433.50 0.00 0.00 0.00 110.00 0.00 66,061 433.50 0.00 0.00 0.00 112.50 0.00 66,053 433.50 0.00 0.00 0.00 115.00 0.00 66,046 433.50 0.00 0.00 0.00 117.50 0.00 66,040 433.50 0.00 0.00 0.00 120.00 0.00 66,034 433.50 0.00 0.00 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 18 Stage-Discharge for Pond 2: SWM/BMP 2 Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary (feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs) 429.00 0.00 0.00 0.00 434.10 0.56 0.56 0.00 429.10 0.00 0.00 0.00 434.20 0.63 0.63 0.00 429.20 0.00 0.00 0.00 434.30 0.70 0.70 0.00 429.30 0.00 0.00 0.00 434.40 0.76 0.76 0.00 429.40 0.00 0.00 0.00 434.50 0.82 0.82 0.00 429.50 0.00 0.00 0.00 434.60 0.87 0.87 0.00 429.60 0.00 0.00 0.00 434.70 0.92 0.92 0.00 429.70 0.00 0.00 0.00 434.80 0.97 0.97 0.00 429.80 0.00 0.00 0.00 434.90 1.01 1.01 0.00 429.90 0.00 0.00 0.00 435.00 1.06 1.06 0.00 430.00 0.00 0.00 0.00 435.10 1.10 1.10 0.00 430.10 0.00 0.00 0.00 435.20 1.14 1.14 0.00 430.20 0.00 0.00 0.00 435.30 1.18 1.18 0.00 430.30 0.00 0.00 0.00 435.40 1.21 1.21 0.00 430.40 0.00 0.00 0.00 435.50 1.25 1.25 0.00 430.50 0.00 0.00 0.00 435.60 1.29 1.29 0.00 430.60 0.00 0.00 0.00 435.70 1.32 1.32 0.00 430.70 0.00 0.00 0.00 435.80 1.35 1.35 0.00 430.80 0.00 0.00 0.00 435.90 1.39 1.39 0.00 430.90 0.00 0.00 0.00 436.00 1.42 1.42 0.00 431.00 0.00 0.00 0.00 436.10 2.75 2.75 0.00 431.10 0.00 0.00 0.00 436.20 5.16 5.16 0.00 431.20 0.00 0.00 0.00 436.30 8.26 8.26 0.00 431.30 0.00 0.00 0.00 436.40 11.93 11.93 0.00 431.40 0.00 0.00 0.00 436.50 16.10 16.10 0.00 431.50 0.00 0.00 0.00 436.60 21.78 20.69 1.08 431.60 0.00 0.00 0.00 436.70 28.83 25.69 3.14 431.70 0.00 0.00 0.00 436.80 36.96 31.05 5.90 431.80 0.00 0.00 0.00 436.90 46.05 36.76 9.29 431.90 0.00 0.00 0.00 437.00 56.06 42.80 13.27 432.00 0.00 0.00 0.00 437.10 66.95 49.14 17.81 432.10 0.00 0.00 0.00 437.20 78.69 55.77 22.92 432.20 0.00 0.00 0.00 437.30 91.26 62.69 28.57 432.30 0.00 0.00 0.00 437.40 97.98 63.20 34.78 432.40 0.00 0.00 0.00 437.50 105.18 63.64 41.54 432.50 0.00 0.00 0.00 437.60 112.93 64.08 48.85 432.60 0.00 0.00 0.00 437.70 121.23 64.51 56.72 432.70 0.00 0.00 0.00 437.80 130.09 64.94 65.15 432.80 0.00 0.00 0.00 437.90 139.51 65.37 74.14 432.90 0.00 0.00 0.00 438.00 149.50 65.80 83.70 433.00 0.00 0.00 0.00 433.10 0.00 0.00 0.00 433.20 0.00 0.00 0.00 433.30 0.00 0.00 0.00 433.40 0.00 0.00 0.00 433.50 0.00 0.00 0.00 433.60 0.03 0.03 0.00 433.70 0.11 0.11 0.00 433.80 0.23 0.23 0.00 433.90 0.36 0.36 0.00 434.00 0.47 0.47 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 19 Stage-Area-Storage for Pond 2: SWM/BMP 2 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 429.00 11,005 0 434.10 19,596 77,427 429.10 11,161 1,108 434.20 19,781 79,396 429.20 11,318 2,232 434.30 19,966 81,384 429.30 11,474 3,372 434.40 20,151 83,389 429.40 11,631 4,527 434.50 20,336 85,414 429.50 11,787 5,698 434.60 20,521 87,457 429.60 11,943 6,885 434.70 20,706 89,518 429.70 12,100 8,087 434.80 20,891 91,598 429.80 12,256 9,304 434.90 21,076 93,696 429.90 12,413 10,538 435.00 21,261 95,813 430.00 12,569 11,787 435.10 21,452 97,949 430.10 12,732 13,052 435.20 21,642 100,103 430.20 12,895 14,333 435.30 21,833 102,277 430.30 13,059 15,631 435.40 22,023 104,470 430.40 13,222 16,945 435.50 22,214 106,682 430.50 13,385 18,276 435.60 22,405 108,913 430.60 13,548 19,622 435.70 22,595 111,163 430.70 13,711 20,985 435.80 22,786 113,432 430.80 13,875 22,364 435.90 22,976 115,720 430.90 14,038 23,760 436.00 23,167 118,027 431.00 14,201 25,172 436.10 23,363 120,354 431.10 14,369 26,601 436.20 23,559 122,700 431.20 14,537 28,046 436.30 23,756 125,065 431.30 14,705 29,508 436.40 23,952 127,451 431.40 14,873 30,987 436.50 24,148 129,856 431.50 15,041 32,483 436.60 24,344 132,280 431.60 15,209 33,995 436.70 24,540 134,725 431.70 15,377 35,524 436.80 24,737 137,188 431.80 15,545 37,070 436.90 24,933 139,672 431.90 15,713 38,633 437.00 25,129 142,175 432.00 15,881 40,213 437.10 25,330 144,698 432.10 16,055 41,810 437.20 25,531 147,241 432.20 16,228 43,424 437.30 25,732 149,804 432.30 16,402 45,055 437.40 25,933 152,387 432.40 16,576 46,704 437.50 26,135 154,991 432.50 16,750 48,371 437.60 26,336 157,614 432.60 16,923 50,054 437.70 26,537 160,258 432.70 17,097 51,755 437.80 26,738 162,922 432.80 17,271 53,474 437.90 26,939 165,606 432.90 17,444 55,209 438.00 27,140 168,310 433.00 17,618 56,963 433.10 17,797 58,733 433.20 17,977 60,522 433.30 18,156 62,329 433.40 18,335 64,153 433.50 18,515 65,996 433.60 18,694 67,856 433.70 18,873 69,734 433.80 19,052 71,631 433.90 19,232 73,545 434.00 19,411 75,477 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 20 Time span=5.00-120.00 hrs,dM105 hrs,2301 points Runoff by SCS TR-20 method,UH=SCS,Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 3S:Ultimate Post Development Runoff Area=8.830 ac 45.30%Impervious Runoff Depth=6.28" Flow Length=1,060' Tc=13.3 min CN=78 Runoff=73.68 cfs 4.618 af Pond 2: SWM/BMP 2 Peak E1ev=436.97' Storage=141,364 cf Inflow=73.68 cfs 4.618 af Primary=40.84 cfs 4.638 af Secondary=11.96 cfs 0.198 af Outflow=52.80 cfs 4.835 af Total Runoff Area=8.830 ac Runoff Volume=4.618 af Average Runoff Depth=6.28" 54.70%Pervious=4.830 ac 45.30%Impervious=4.000 ac You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP SWM-BMP 2 Type II 24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 3S: Ultimate Post Development Runoff = 73.68 cfs @ 12.05 hrs, Volume= 4.618 af, Depth= 6.28" Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=5.00-120.00 hrs,dt=0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area(ac) CN Description * 4.000 98 Anticipated Impervious Area(B-Soils) * 4.830 61 Anticipated open space pervious area(B-Soils) 8.830 78 Weighted Average 4.830 54.70%Pervious Area 4.000 45.30%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.5 50 0.0330 0.09 Sheet Flow,Sheet Flow Woods: Light underbrush n=0.400 P2=3.62" 2.7 550 0.0500 3.35 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 1.1 460 0.0200 6.79 325.70 Channel Flow, Area=48.0 sf Perim=23.4' r=2.05' n=0.050 Mountain streams w/large boulders 13.3 1,060 Total Subcatchment 3S: Ultimate Post Development Hydrograph A 81 73.68 cfs I Runoff 70 Type II 24-hr 100-Year Rainfall=8.95" 60 Runoff Area=8.830 ac w 50 Runoff Volume=4.618 af Runoff Depth=6.28" 40 Flow Length=1,060' LT 30 Tc=13.3 min 20 CN=78 10 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 22 Hydrograph for Subcatchment 3S: Ultimate Post Development Time Precip. Excess Runoff Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.56 0.00 0.00 56.00 8.95 6.28 0.00 107.00 8.95 6.28 0.00 6.00 0.72 0.01 0.11 57.00 8.95 6.28 0.00 108.00 8.95 6.28 0.00 7.00 0.89 0.03 0.27 58.00 8.95 6.28 0.00 109.00 8.95 6.28 0.00 8.00 1.07 0.08 0.46 59.00 8.95 6.28 0.00 110.00 8.95 6.28 0.00 9.00 1.32 0.16 0.85 60.00 8.95 6.28 0.00 111.00 8.95 6.28 0.00 10.00 1.62 0.29 1.32 61.00 8.95 6.28 0.00 112.00 8.95 6.28 0.00 11.00 2.10 0.54 2.83 62.00 8.95 6.28 0.00 113.00 8.95 6.28 0.00 12.00 5.93 3.52 67.27 63.00 8.95 6.28 0.00 114.00 8.95 6.28 0.00 13.00 6.91 4.39 5.17 64.00 8.95 6.28 0.00 115.00 8.95 6.28 0.00 14.00 7.34 4.78 2.99 65.00 8.95 6.28 0.00 116.00 8.95 6.28 0.00 15.00 7.64 5.06 2.30 66.00 8.95 6.28 0.00 117.00 8.95 6.28 0.00 16.00 7.88 5.28 1.80 67.00 8.95 6.28 0.00 118.00 8.95 6.28 0.00 17.00 8.07 5.46 1.55 68.00 8.95 6.28 0.00 119.00 8.95 6.28 0.00 18.00 8.24 5.62 1.37 69.00 8.95 6.28 0.00 120.00 8.95 6.28 0.00 19.00 8.39 5.76 1.19 70.00 8.95 6.28 0.00 20.00 8.52 5.87 1.00 71.00 8.95 6.28 0.00 21.00 8.63 5.98 0.94 72.00 8.95 6.28 0.00 22.00 8.74 6.08 0.90 73.00 8.95 6.28 0.00 23.00 8.85 6.18 0.86 74.00 8.95 6.28 0.00 24.00 8.95 6.28 0.83 75.00 8.95 6.28 0.00 25.00 8.95 6.28 0.00 76.00 8.95 6.28 0.00 26.00 8.95 6.28 0.00 77.00 8.95 6.28 0.00 27.00 8.95 6.28 0.00 78.00 8.95 6.28 0.00 28.00 8.95 6.28 0.00 79.00 8.95 6.28 0.00 29.00 8.95 6.28 0.00 80.00 8.95 6.28 0.00 30.00 8.95 6.28 0.00 81.00 8.95 6.28 0.00 31.00 8.95 6.28 0.00 82.00 8.95 6.28 0.00 32.00 8.95 6.28 0.00 83.00 8.95 6.28 0.00 33.00 8.95 6.28 0.00 84.00 8.95 6.28 0.00 34.00 8.95 6.28 0.00 85.00 8.95 6.28 0.00 35.00 8.95 6.28 0.00 86.00 8.95 6.28 0.00 36.00 8.95 6.28 0.00 87.00 8.95 6.28 0.00 37.00 8.95 6.28 0.00 88.00 8.95 6.28 0.00 38.00 8.95 6.28 0.00 89.00 8.95 6.28 0.00 39.00 8.95 6.28 0.00 90.00 8.95 6.28 0.00 40.00 8.95 6.28 0.00 91.00 8.95 6.28 0.00 41.00 8.95 6.28 0.00 92.00 8.95 6.28 0.00 42.00 8.95 6.28 0.00 93.00 8.95 6.28 0.00 43.00 8.95 6.28 0.00 94.00 8.95 6.28 0.00 44.00 8.95 6.28 0.00 95.00 8.95 6.28 0.00 45.00 8.95 6.28 0.00 96.00 8.95 6.28 0.00 46.00 8.95 6.28 0.00 97.00 8.95 6.28 0.00 47.00 8.95 6.28 0.00 98.00 8.95 6.28 0.00 48.00 8.95 6.28 0.00 99.00 8.95 6.28 0.00 49.00 8.95 6.28 0.00 100.00 8.95 6.28 0.00 50.00 8.95 6.28 0.00 101.00 8.95 6.28 0.00 51.00 8.95 6.28 0.00 102.00 8.95 6.28 0.00 52.00 8.95 6.28 0.00 103.00 8.95 6.28 0.00 53.00 8.95 6.28 0.00 104.00 8.95 6.28 0.00 54.00 8.95 6.28 0.00 105.00 8.95 6.28 0.00 55.00 8.95 6.28 0.00 106.00 8.95 6.28 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 23 Summary for Pond 2: SWM/BMP 2 Inflow Area= 8.830 ac, 45.30% Impervious, Inflow Depth= 6.28" for 100-Year event Inflow = 73.68 cfs @ 12.05 hrs, Volume= 4.618 of Outflow = 52.80 cfs @ 12.15 hrs, Volume= 4.835 af, Atten=28%, Lag=6.3 min Primary = 40.84 cfs @ 12.15 hrs, Volume= 4.638 af Secondary= 11.96 cfs @ 12.15 hrs, Volume= 0.198 af Routing by Stor-Ind method,Time Span=5.00-120.00 hrs,dt=0.05 hrs Starting Elev=434.00' Surf Area= 19,411 sf Storage=75,477 cf Peak Elev=436.97' @ 12.15 hrs Surf.Area=25,066 sf Storage= 141,364 cf (65,887 cf above start) Plug-Flow detention time=590.3 min calculated for 3.101 af(67%of inflow) Center-of-Mass det.time=278.4 min( 1,085.2-806.9) Volume Invert Avail.Storage Storage Description #1 429.00' 168,310 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 429.00 11,005 0 0 430.00 12,569 11,787 11,787 431.00 14,201 13,385 25,172 432.00 15,881 15,041 40,213 433.00 17,618 16,750 56,963 434.00 19,411 18,515 75,477 435.00 21,261 20,336 95,813 436.00 23,167 22,214 118,027 437.00 25,129 24,148 142,175 438.00 27,140 26,135 168,310 Device Routing Invert Outlet Devices #1 Primary 429.00' 30.0" Round Culvert L=82.3' RCP,square edge headwall, Ke=0.500 Inlet/Outlet Invert=429.00' /427.00' S=0.0243 'P Cc=0.900 n=0.013, Flow Area=4.91 sf #2 Device 1 433.50' 6.0"Vert.Orifice C=0.600 #3 Device 1 436.00' 48.0"Horiz.Riser C=0.600 Limited to weir flow at low heads #4 Secondary 436.50' Emergency Spillway,Cv=2.68(C=3.35) Head(feet) 0.00 1.50 Width(feet) 10.00 19.00 rimary Outflow Max-40.66 cfs @ 12.15 hrs HW=436.97 (Free Discharge) culvert (Passes 40.66 cfs of 61.25 cfs potential flow) 2 Orifice (Orifice Controls 1.70 cfs @ 8.63 fps) 3=Riser (Weir Controls 38.96 cfs @ 3.21 fps) econdary Outflow Max=11.82 cfs @ 12.15 hrs HW=436.97 (Free Discharge) Emergency Spillway (Weir Controls 11.82 cfs @ 2.23 fps) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 24 Pond 2: SWM/BMP 2 Hydrograph 73.68 cfs • Inflow Inflow Area=8.830 ac 1 Outflow 80_ Peak Elev=436.97' U Primary 70 Storage=141,364 cf _❑ Secondary 52.80 cfs 60-_ ril i 50 40.84 cfs 0 40 = I v_ 30_ 2 11.96 cfs 10- Aiii'4.1(/iiiiiiiiiiiiii�/iiiii,,,- ii�iiiiiiiiiiiiiiiz/, 0- � ��I..%Z�� :n W��.77 //�� 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond 2: SWM/BMP 2 Stage-Discharge ,�,,�►►,4►, -- ``-- r" Total 438 ��,,��•�/ -"''' � U Primary 437 .�'''' Emergency Spillway ❑ Secondary 436 d 435 0 = 434 �a 433 0 w 432 431 : 430 /429 0 50 100 Discharge (cfs) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP SWM-BMP 2 Type II 24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 25 Pond 2: SWM/BMP 2 Stage-Area-Storage Surface/Horizontal/Wetted Area (sq-ft) Surface 0 5,000 10,000 15,000 20,000 25,000 ' Storage ii ,: Starting Elevation 430 Custom Stage Data 429 0 50,000 100,000 150,000 Storage (cubic-feet) You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type I124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 26 Hydrograph for Pond 2: SWM/BMP 2 Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs) 5.00 0.00 75,477 434.00 0.47 0.47 0.00 7.50 0.36 73,370 433.89 0.35 0.35 0.00 10.00 1.32 76,475 434.05 0.52 0.52 0.00 12.50 10.29 129,696 436.49 15.81 15.81 0.00 15.00 2.30 119,958 436.08 2.53 2.53 0.00 17.50 1.46 118,488 436.02 1.54 1.54 0.00 20.00 1.00 116,598 435.94 1.40 1.40 0.00 22.50 0.88 112,624 435.76 1.34 1.34 0.00 25.00 0.00 106,116 435.47 1.24 1.24 0.00 27.50 0.00 95,771 435.00 1.06 1.06 0.00 30.00 0.00 87,129 434.58 0.86 0.86 0.00 32.50 0.00 80,254 434.24 0.66 0.66 0.00 35.00 0.00 75,202 433.99 0.46 0.46 0.00 37.50 0.00 72,021 433.82 0.26 0.26 0.00 40.00 0.00 70,276 433.73 0.15 0.15 0.00 42.50 0.00 69,256 433.67 0.09 0.09 0.00 45.00 0.00 68,591 433.64 0.06 0.06 0.00 47.50 0.00 68,128 433.61 0.04 0.04 0.00 50.00 0.00 67,804 433.60 0.03 0.03 0.00 52.50 0.00 67,573 433.58 0.02 0.02 0.00 55.00 0.00 67,378 433.57 0.02 0.02 0.00 57.50 0.00 67,207 433.57 0.02 0.02 0.00 60.00 0.00 67,057 433.56 0.02 0.02 0.00 62.50 0.00 66,926 433.55 0.01 0.01 0.00 65.00 0.00 66,811 433.54 0.01 0.01 0.00 67.50 0.00 66,710 433.54 0.01 0.01 0.00 70.00 0.00 66,622 433.53 0.01 0.01 0.00 72.50 0.00 66,544 433.53 0.01 0.01 0.00 75.00 0.00 66,476 433.53 0.01 0.01 0.00 77.50 0.00 66,417 433.52 0.01 0.01 0.00 80.00 0.00 66,365 433.52 0.01 0.01 0.00 82.50 0.00 66,319 433.52 0.00 0.00 0.00 85.00 0.00 66,279 433.52 0.00 0.00 0.00 87.50 0.00 66,244 433.51 0.00 0.00 0.00 90.00 0.00 66,213 433.51 0.00 0.00 0.00 92.50 0.00 66,186 433.51 0.00 0.00 0.00 95.00 0.00 66,163 433.51 0.00 0.00 0.00 97.50 0.00 66,142 433.51 0.00 0.00 0.00 100.00 0.00 66,124 433.51 0.00 0.00 0.00 102.50 0.00 66,108 433.51 0.00 0.00 0.00 105.00 0.00 66,094 433.51 0.00 0.00 0.00 107.50 0.00 66,082 433.50 0.00 0.00 0.00 110.00 0.00 66,071 433.50 0.00 0.00 0.00 112.50 0.00 66,062 433.50 0.00 0.00 0.00 115.00 0.00 66,054 433.50 0.00 0.00 0.00 117.50 0.00 66,047 433.50 0.00 0.00 0.00 120.00 0.00 66,040 433.50 0.00 0.00 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 27 Stage-Discharge for Pond 2: SWM/BMP 2 Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary (feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs) 429.00 0.00 0.00 0.00 434.10 0.56 0.56 0.00 429.10 0.00 0.00 0.00 434.20 0.63 0.63 0.00 429.20 0.00 0.00 0.00 434.30 0.70 0.70 0.00 429.30 0.00 0.00 0.00 434.40 0.76 0.76 0.00 429.40 0.00 0.00 0.00 434.50 0.82 0.82 0.00 429.50 0.00 0.00 0.00 434.60 0.87 0.87 0.00 429.60 0.00 0.00 0.00 434.70 0.92 0.92 0.00 429.70 0.00 0.00 0.00 434.80 0.97 0.97 0.00 429.80 0.00 0.00 0.00 434.90 1.01 1.01 0.00 429.90 0.00 0.00 0.00 435.00 1.06 1.06 0.00 430.00 0.00 0.00 0.00 435.10 1.10 1.10 0.00 430.10 0.00 0.00 0.00 435.20 1.14 1.14 0.00 430.20 0.00 0.00 0.00 435.30 1.18 1.18 0.00 430.30 0.00 0.00 0.00 435.40 1.21 1.21 0.00 430.40 0.00 0.00 0.00 435.50 1.25 1.25 0.00 430.50 0.00 0.00 0.00 435.60 1.29 1.29 0.00 430.60 0.00 0.00 0.00 435.70 1.32 1.32 0.00 430.70 0.00 0.00 0.00 435.80 1.35 1.35 0.00 430.80 0.00 0.00 0.00 435.90 1.39 1.39 0.00 430.90 0.00 0.00 0.00 436.00 1.42 1.42 0.00 431.00 0.00 0.00 0.00 436.10 2.75 2.75 0.00 431.10 0.00 0.00 0.00 436.20 5.16 5.16 0.00 431.20 0.00 0.00 0.00 436.30 8.26 8.26 0.00 431.30 0.00 0.00 0.00 436.40 11.93 11.93 0.00 431.40 0.00 0.00 0.00 436.50 16.10 16.10 0.00 431.50 0.00 0.00 0.00 436.60 21.78 20.69 1.08 431.60 0.00 0.00 0.00 436.70 28.83 25.69 3.14 431.70 0.00 0.00 0.00 436.80 36.96 31.05 5.90 431.80 0.00 0.00 0.00 436.90 46.05 36.76 9.29 431.90 0.00 0.00 0.00 437.00 56.06 42.80 13.27 432.00 0.00 0.00 0.00 437.10 66.95 49.14 17.81 432.10 0.00 0.00 0.00 437.20 78.69 55.77 22.92 432.20 0.00 0.00 0.00 437.30 91.26 62.69 28.57 432.30 0.00 0.00 0.00 437.40 97.98 63.20 34.78 432.40 0.00 0.00 0.00 437.50 105.18 63.64 41.54 432.50 0.00 0.00 0.00 437.60 112.93 64.08 48.85 432.60 0.00 0.00 0.00 437.70 121.23 64.51 56.72 432.70 0.00 0.00 0.00 437.80 130.09 64.94 65.15 432.80 0.00 0.00 0.00 437.90 139.51 65.37 74.14 432.90 0.00 0.00 0.00 438.00 149.50 65.80 83.70 433.00 0.00 0.00 0.00 433.10 0.00 0.00 0.00 433.20 0.00 0.00 0.00 433.30 0.00 0.00 0.00 433.40 0.00 0.00 0.00 433.50 0.00 0.00 0.00 433.60 0.03 0.03 0.00 433.70 0.11 0.11 0.00 433.80 0.23 0.23 0.00 433.90 0.36 0.36 0.00 434.00 0.47 0.47 0.00 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com) J:\SDSKPROJ\20140064\Documents\Calculations\CBPA\3rd Submittal\ NP_SWM-BMP 2 Type II 24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING Printed 12/22/2015 HydroCAD®10.00-12 s/n 06356 ©2014 HydroCAD Software Solutions LLC Page 28 Stage-Area-Storage for Pond 2: SWM/BMP 2 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 429.00 11,005 0 434.10 19,596 77,427 429.10 11,161 1,108 434.20 19,781 79,396 429.20 11,318 2,232 434.30 19,966 81,384 429.30 11,474 3,372 434.40 20,151 83,389 429.40 11,631 4,527 434.50 20,336 85,414 429.50 11,787 5,698 434.60 20,521 87,457 429.60 11,943 6,885 434.70 20,706 89,518 429.70 12,100 8,087 434.80 20,891 91,598 429.80 12,256 9,304 434.90 21,076 93,696 429.90 12,413 10,538 435.00 21,261 95,813 430.00 12,569 11,787 435.10 21,452 97,949 430.10 12,732 13,052 435.20 21,642 100,103 430.20 12,895 14,333 435.30 21,833 102,277 430.30 13,059 15,631 435.40 22,023 104,470 430.40 13,222 16,945 435.50 22,214 106,682 430.50 13,385 18,276 435.60 22,405 108,913 430.60 13,548 19,622 435.70 22,595 111,163 430.70 13,711 20,985 435.80 22,786 113,432 430.80 13,875 22,364 435.90 22,976 115,720 430.90 14,038 23,760 436.00 23,167 118,027 431.00 14,201 25,172 436.10 23,363 120,354 431.10 14,369 26,601 436.20 23,559 122,700 431.20 14,537 28,046 436.30 23,756 125,065 431.30 14,705 29,508 436.40 23,952 127,451 431.40 14,873 30,987 436.50 24,148 129,856 431.50 15,041 32,483 436.60 24,344 132,280 431.60 15,209 33,995 436.70 24,540 134,725 431.70 15,377 35,524 436.80 24,737 137,188 431.80 15,545 37,070 436.90 24,933 139,672 431.90 15,713 38,633 437.00 25,129 142,175 432.00 15,881 40,213 437.10 25,330 144,698 432.10 16,055 41,810 437.20 25,531 147,241 432.20 16,228 43,424 437.30 25,732 149,804 432.30 16,402 45,055 437.40 25,933 152,387 432.40 16,576 46,704 437.50 26,135 154,991 432.50 16,750 48,371 437.60 26,336 157,614 432.60 16,923 50,054 437.70 26,537 160,258 432.70 17,097 51,755 437.80 26,738 162,922 432.80 17,271 53,474 437.90 26,939 165,606 432.90 17,444 55,209 438.00 27,140 168,310 433.00 17,618 56,963 433.10 17,797 58,733 433.20 17,977 60,522 433.30 18,156 62,329 433.40 18,335 64,153 433.50 18,515 65,996 433.60 18,694 67,856 433.70 18,873 69,734 433.80 19,052 71,631 433.90 19,232 73,545 434.00 19,411 75,477 You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com)