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HomeMy WebLinkAboutSW8060308_HISTORICAL FILE_20060421STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS I� HISTORICAL FILE C ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE C� � YYYYMMDD JBSC NCDENR - Express Permitting 127 Cardinal Drive Extension Wilmington, NC 28405 LAfE Robert Gordon LETTER OF TRANSMITTAL DATE: April 21, 2006 PROJECT NO: 01 1-007 TASK NO: RE: Sunset Marina TRANSMITTAL NO: 1 PAGE 1 OF WE ARE SENDING: x Originals ❑ Prints ❑ Shop Drawings ❑ Samples ❑ Specifications II Calculations Other - Applications ications Quantity Drawing No. Rev. Description Status 3 Revised Post Drainage Basin Map G 3 Revised Stormwater Management Permit Application page 2 G Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid E. Construction F. For Review & Comments G. For Approval H. See Remarks: Action Status Code: 1. No Exceptions Taken 2. Make Corrections Noted 3. Other 4. Amend & Resubmit 5. Rejected - See Remarks REMARKS: RECETVED APR 2 1 2006 BY: 7332 Cotesworth Dave Wilmington. NC Phone 1 a10-619-49W Fax 1910.401-16M cc: File Copy JBS C sulting, P Signed AS PA p�g ' ti' . • a4ioeiru ConshrlionMaxpaTient April 13, 2006 Robert D. Gordon NCDENT- DWQ 127 Cardinal Drive Extension Wilmington, NC 28405-3845 RE: Sunset Marina Stormwater Project No. SW8 060308 Response to April 10 Comments Robert: 7332 Cotesworth Drive Wilmington, NC 28405 Phone.'910-619-9990 Fax: 910-401-162G Email: BrodSedgwick@Hotmail.Com Attached is the re -submittal of the above referenced project. Inctuded below are responses to the comments of your April 10, 2006 letter. Your comments have been included for ease of reference. 1. Request for inrf7tration Basin Supplement. This BMP Supplement its attached 2. Note on suitable sass in infr7tration basin # 1. Note added to both the Sheet C2 and Sheet C4 (detcd sheet). 3. Please Est drainage area on the drainage area map. I hove added the areas to the four drainage basins. 4. Please add a note to the plans indicafing that all roof drains wig be directed to the permitted inhTfration systems. Note added to Sheet C2 RE: Roof Drain routing. Should you have additional questions please do not hesitate to call me. Sin ely, Bra Sedgwick, PE Attachment: 2 - Revised Construction plans (Sheets C1, C2 and C4) 1 - Post Drainage Basin Map 2 — Basin 2 Supplemental firm O-J z _<. "IU6 dJ, n . . , . J'l - - '� * * * COMMUNICATION RESULT REPORT ( APR.11.2006 1:59PM ) * * * P. 1 FILE MODE - 002 MEMORYTX OPTION REASON FOR ERROR-------------------- E-1) HANG UP OR LINE FAIL E-3) NO ANSWER 5OK CDENR WIRO ADDRESS (GROUP) PAGE -------------------------------- ----------------- 919104011620 P. 1/1 E-2) BUSY E-4) NO FACSIMILE CONNECTION FAX COVER SHEET Date: April 10, 2006 No. of Pages: 1 To: Brad Sedgewick, PE From; Robert Gordon Jeff Roney Express permitting section Company: JBS Consulting FAX # 910-350.2004 FAX #: 401-1620 Phone # 910-796-7303 DWQ Stormwater Project Number: SW8 06030B Project Name: JBS Consulting MESSAGE: There are just a few additional items I need before I can issue the permit for Sunset Marina. Because there are only a few items, I am not planning to send any further correspondence. There is no required return date, but please try to return the modifications within two weeks. Please call if you have any questions. Thanksl • I mentioned this on the last fax I sent, but you may not have seen it. I need to get an infiltration basin supplement for the bioretention area (basin #2). Technically, there is supposed to be 2' of reparation between the bottom of the fill layer and the SHWT for a bioretention area (which your Date: To: Company: FAX #: FAX COVER SHEET April 10, 2006 No. of Pages: 1 0.41 Brad Sedgewick, PE From: Robert Gordon Jeff Roney Express permitting section JBS Consulting FAX # 910-350-2004 401-1620 Phone # 910-796-7303 DWQ Stormwater Project Number: SW8 060308 Project Name: JBS Consulting MESSAGE: There are just a few additional items I need before I can issue the permit for Sunset Marina. Because there are only a few items, 1 am not planning to send any further correspondence. There is no required return date, but please try to return the modifications within two weeks. Please call if you have any questions. Thanks! I mentioned this on the last fax I sent, but you may not have seen it. I need to get an infiltration basin supplement for the bioretention area (basin #2). Technically, there is supposed to be 2' of separation between the bottom of the fill layer and the SHWT for a bioretention area (which your system does not provide). This is a little unfair for a system without underdrains, so I have to permit it as an infiltration basin (which only requires 2' from the bottom of the storage pool). The bioretention O&M plan you submitted will still be valid. According to Vincent's field data, basin #1 has unsuitable soils from 20" — 48" (or from elev. 9.0 to 11.3). This is below the bottom of you basin and will affect that basin's ability to infiltrate. This layer must be removed and replaced with clean sand. Infiltration systems are not typically allowed in fill, but Vincent feels the underlying, in -situ soils are good enough to allow it. Please list the drainage area on the drainage area map. Please add a note to the plans indicating that all roof drains will be directed to the permitted infiltration system. • r • March 28, 2006 Robert D. Gordon NCDENT - DWQ 127 Cardinal Drive Extension Wilmington, NC 28405-3845 7332 Cotesworth Drive Wilmington. NC 28405 Phone.910-619-9990 Fax: 910-401-I620 Email: Brad$edgwickQHotmail.com RE: Sunset Marina — - - :Ala Stormwater Project No. SW8 060308 i_ Robert: (AAAMOUZI Attached is the re -submittal of the above referenced project. Included below are responses to the comments of your March 17, 2006 letter. Your comments have been induded for ease of reference. 1. Please provide one copy of a drainage area map for the site. This map should show and fist the DA for each of the BMP`s. Attached is a drainage area map for your review. 2. Please dimension the entire project boundary. It was only partially dimensioned. The attached plan has been revised to include the entire boundary information. 3. There were no contours provided for the South side of the property, they appear to be clipped at the parcel # 1 boundary. The missing contours are indicated on the attached revised plan. 4. There appears to be wetlands near the Southern project boundary. Please clarify. A portion of the 50' vegetated filter (for basin #31 appears to be within the wetlands. There are wetlands 0 the area you refer to, the attached plan has been revised to more clearly indicate the Omits of the wetland. None of the 50' vegetated filler is in the wetlands, the revised plan shows that area more dearly now. 5 Please correct the river basin listed on Section lA (2)of the application. The corrected application is attached. b. Please clarify the column fisted as "bash 4" on the application. There are only BMP`s proposed. This column appears to be everything else. That is correct basin 4 is everything else not inducted in basins 1, 2 and 3. Basin 4 is made up of existing impervious surfaces that did not require a BMP but was used in the total project impervious area calculation. • Page 2 April 4, 2006 7. Please correct the vegetated frTier detarl.lt may have a maximum longitudinal slope of 5% not 5.1. The detail has been corrected. 8. Please show the SHWr and storage/bypass elevation on the x section for the inffitrafion basin(s). I have added a table that indicated the SHWT, storage and the bypass elevation to the bio- retention and infiltration basin detail. 9. Please correct the fiffe of the applicant. The He must be VP or higher. 10. Please provide a typical bypass structure detail A bypass structure detail has been added to the plans. 11. Please note the following comments from the site visit by Vincent Lewis the DENR soil scientist, and make any necessary changes to accommodate his findings. The borings were taken at approximately the some locations as was marked on the ECS boring log. a. Basin 1-SHW depfh = 48" (ECS = 36"). Unsuitable sal from 20" to 48", may be removed and backtiNed with clean sand Sand below 48". b. Basin 2 -SHW depth = 55" (ECS = 48"). Unsuitable soil layer from 30" to 41 ", may be removed and backfilled with clean sand (or sand mw a for bioretention area). c. Basin 3 - SHW depth = 51 " (ECS = 70"). AN soils suitable (sand). The information has been noted and incorporated in to the plans. Should you have additional questions please do not hesitate to call me. Sincerely, Jeff A. Roney Senior Designer Phone: (91 Q) 232-0359 Emal roneyi@garthlink.net Attachment 2 -- Revised Constu lion plans 2 — Revised S'WU-101 StornwrdW Management Permit Application 2 — Drainage Basin Map 2 — Revised Basin 3 Supplemental form P. 1 * * * COMMUNICATION RESULT REPORT ( MAR.17.2006 FILE MODE OPTION ---------------------------- 545 MEMORY TX REASON FOR ERROR E-1) HANG UP OR LINE FAIL E-3) NO ANSWER ADDRESS (GROUP) ------ 94011620 5:14PM ) * * * TTI NCDENR WIRO RESULT PAGE ----- -------------------- E-3)3)3)3)3) P. 0/3 E-2) BUSY E-4) NO FACSIMILE CONNECTION FAX COVER SHEET Date: March 17, 2006 No. of Pages: 3 To: Brad Sedgewick, PE From: Robert Gordon P-6— Express permitting s®ction Company: JBS Consulting FAX # 910-350-2004 FAX #: 401-1620 Phone # 910-796-7303 DWQ Stormwater Project Number: SW8 060308 Project Name: Sunset Marina MESSAGE: Attached is the request for additional information for sunset {farina. The original will be mailed to the applicant and a copy will also be mailed to you. please call if you have any questions. Please note Vincent's comments on the add -info letter. Please use the more conservative of the 2 soils reports if possible. if not, go with Vincent's findings. The bioretention standard requires 2' of separation from the bottom of the back#iil layer to the SHWT. This is reasonable where a BIB is utilizing an underdrain (common in piedmont soils), but unreasonable Y 1 •- ..I. . I..P•1."--,0-- -`----'--.-1 0^1 -r-`- - - -v -- a---_ 1� - FAX COVER SHEET Date: March 17, 2006 No. of Pages: 3 To: Brad Sedgewick, PE From: Robert Gordon P4- Express permitting section Company: JIBS Consulting FAX # 910-350-2004 FAX #: 401-1620 Phone # 910-796-7303 DWQ Stormwater Project Number: SW8 060308 Project Name: Sunset Marina MESSAGE: Attached is the request for additional information for sunset Marina. The original will be mailed to the applicant and a copy will also be mailed to you. Please call if you have any questions. => Please note Vincent's comments on the add -info letter. Please use the more conservative of the 2 soils reports if possible. If not, go with Vincent's findings. => The bioretention standard requires 2' of separation from the bottom of the backfill layer to the SHWT. This is reasonable where a BR is utilizing an underdrain (common in piedmont soils), but unreasonable when compared to the infiltration standard (2' of separation from the bottom of the storage volume). I would like to permit BMP#2 as a hybrid. Lets "officially" call it an infiltration basin — that allows a higher SHWT. Please submit a supplement (not just the O&M agreement). I will have to hold you to some of the bioretention standards though (ex. Plant density, ponding depth etc...). If you do use backfill material other than clean sand (and you may need to in order to get plants to grow), please specify the mixture. => This project is going to require a fairly detailed re -review. I would like to schedule a date for re -review (rather than just resubmit whenever — as with a typical add -info). I have scheduled this project for re -review on 3/30 (no additional fee). If you complete it sooner -- go ahead and send it in. Michael F. Easley, Governor William G. Koss Jr., Secretan North Carolina Department of Fnvironment and ;natural Resources Alan W. Klimek, P.E. Director Division of %Vaier Quality March 17, 2006 Mr. Steve Shuttleworth Colorado Coastal Development Company 7741 Market Street, Suite I Wilmington, NC 28405 Subject: Request for Additional Information Stormwater Project No. SW8 060308 Sunset Marina Brunswick County Dear Mr. Shuttleworth: The Wilmington Regional Office received a Stormwater Management Permit Application for Sunset Marina on March 9, 2006. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review. /' Please provide one copy of a drain g map for the site. This map should show and list the DA for each of the BMP , X 2. Please dimension the entire projectlbAndary. It was only partially dimensioned. 3. There were no contours provided f6r the -So h side of the property. They appear to be clipped at the parcel #1 boundary.L--"� 4. There appears to be wetlands near fhe_Sout erh n project boundary. Please clarify. A portion of the 50' vegetated filter (fo�sin #3) appears to be within the wetlands. 5. Please correct the river basin listt-d on Section III (2) of the application. 6. Please clarify the column listed as "basin 4" on the application. There are only 3 BMP's proposed. This column appears to be rything else. 7. Please correct the vegetat d ' ter detail. It may have a maximum longitudinal slope of 5%, not 5:1. 8. Please show the SHWT any storage/bypass elevations on the x-section for the infiltration basin(s). 9. Please correct the title of the applita/tThe title must be VP or higher. 10. Please provide a typical pass structure detail. NorthCarolina ✓Vaturall� North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone (910) 796-721.5 Customer Service 1-877-623-6748 Wilminetoil Regional Office Wilmington, NC 29405 Fax (910) 350-2004 Intemet! ww .nmaterduality.org An Equal Opportunity/Affirmative Action Employer - 50% Recycles /l0% Post Consumer Paper sunset Marina March 17, 2006 Stormwater Permit # SW8 060308 11. Please note the following comments from the site visit by Vincent Lewis, the DENR soil scientist, and make any necessary changes to accommodate his findings. The borings were taken at approximately the same locations as was marked on the ECS boring log. a. Basin 1 — SHW depth = 48" (ECS = 36 .e soil from 20" to 48", may be removed and backfilled with clean sandYfKw 48". b. Basin 2 — SHW depth = 55" (ECS = 48").uitable soil layer from 30" to 41 ", may be removed and backfiiled with clean sansand mixture for bioretention area). Sand below 41 C. Basin 3—SHW depth = 51" (E S 70"). All soils suitable (sand). Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to March 29, 2006, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter please feel free to call me at (910) 796-7303. Sincerely, Robert D. Gordon Environmental Engineer II ENB/RDG: S:IWQSISTORMWATERIADDINFO120061060308mar17 CC' Brad Sedgewick, PE Robert D. Gordon INFILTRATION SITE VISIT REQUEST Name of the Project Location (attach a clear vicinity map): :5c E 4) -v) < f�E� Street address, SR number, community. etc. Directions from the nearest major intersection! Pam, ; ! 7 y f �4 LE t I �1 Owner/Applicant Name-. Consultant Name: Consultant Contact information: Phone, fax, email, etc. #1 #2 #3 #4 #5 #6 -#7 #8 Existing ground elev. @basin/trench= SHWT elev.= SHWT plus 2' (max_ bottom elev.)= Date[Time of Soils Investigation Summary/Comments: _ All proposed infiltration areas and existing, active utility lines located within the proposed basin/trench must be marked and flagged. If these areas are not flagged, the Soils Scientist reserves the right to decline to do the investigation. If the proposed infiltration system will be located in an area of existing pavement and there is no open area nearby, equipment capable of breaking through the impervious layer must be provided. The soils investigation does not take the place of a soils report prepared by an appropriate professional. The Soils Scientist will only verify the soil conditions that are reported in the Soils Report, and make a determination as to the suitability of the site to meet the infiltration design requirements under NCAC 2H.1000, and assumes no liability should, the system fail. n , , 4 j1 t ■ tl it ,'.�` �•�` �� � ' + � � P � § "' M) ff F .0 it x I 3• 1��.� 4 I N ry 1 >tl YC Q n 4 3F W 1 D. BCAfSni Stancland ' l31%348 , "ai t ` pg. 2 5a I / Mad Cad. •P, \� $ �a .Yc = a yxy l�` a� gF. ^ y-rfi3a 3 - q pu �g€:+� :�� f" �3 s., s 3�''• A€ s e > 6� �N? €3 o g� x q°r i = yen �i n 4* a l.att• ; } S�•� r � � �� ��' �a @a' �a�•� 6^!=a'.•i 5 i� ' €„F sod t 9 g J$ 499 WPM a. ai �✓' Cis r a a$ d s i� 1Ead,� :a i� 54 vi 9�"" �'js a 1�edi.� q _� gi. � �; �'•6 �• !R Y >:�C alR° 3t X ] 010100 d i$ i 6° E• ° 9�i t f',.a "qt a i ; C! �.� t v s @ 6 f:s'`s Pub >; 0{ %, 3y r°tr 3 a4 a•� err' a !' 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Infiltration Rate. 0.15inches per minute (8.9 inches per hour) Test was conducted at 24 inches. #2 0-6" Dark Grey silty SAND 6" -24" Tan Silty SAND 24"-48" StiffOrange CLAY 'Seasonal High Water Table was not identified up to.48" below land surface. Infiltration Rate: 0.007 inches per minute (0.4 inches per hour) Test was conducted at 24 inches. #3 0-6" Dark Grey silty SAND 6"-72" Tan fine SAND Seasonal High Water Table was estimated to be at 70" below the existing grade elevation. Infiltration Rate at 24 inches: 0.1 5 inches per minute (8.7 inches per hour) Infiltration Rate at 48 niches: 0.13 inches per minute (7.9 inches per hour) Cedar Flay s - � � 1T11 �,_ � F1'.a�eT4�r �'1`rCrlpJ .. x .. �,;• +•f,. '��'��ihf..C.�, , , e bQnrios 1[7Chj h yy It'f �It'r 4r� tzIckiiiati. 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JBSC NCDENR - Express Permitting 127 Cardinal Drive Extension Wilmington, NC 28405 ATTENTION: Cameron Weaver LETTER OF TRANSMITTAL DATE: March 9, 2006 PROJECT NO: 01 1-007 TASK NO: RE: Sunset Marina TRANSMITTAL NO: 1 PAGE 1 OF 1 WE ARE SENDING: x Originals Z Prints ❑ Shop Drawings ❑ Samples II Specifications Z Calculations Other - Applications Quantity Drawing No. Rev. Description Status 3 D1, C1,C2, C3,& C4 Construction Plans G 3 Stormwater Calculations and Supporting Data Report G 3 Stormwater Management Permit Application form G 3 Infiltration Basin Supplement form for Basin #1 G 3 Infiltration Basin Supplement form for Basin #3 G 3 Bioretention System Operation and Maintenance Plan G Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid E. Construction F- For Review & Comments G. For Approval H. See Remarks Action Status Code: 1. No Exceptions Taken 2. Make Corrections Noted 3. Other 4. Amend & Resubmit 5. Rejected - See Remarks REMARKS: Attached are 3 sets of plans and calculations for your review. The $4000.00 express review application fee check has already been turned in when the S&E application that was made on the 28th of February.e. RECEIVED MN� V to looe,� Sr- -3j L 1 LLTN - 1133 $ �' 7332 Coteswo th Drive Wilmington, NC Phone 1-910-619-9M Fax 1.910-792-9760 cc: File Copy S C JB onsultrng, PA Signed ` �� , .,-,�' , 4 1. y ' t 4 ®NAB NCDENR V rLtc North Carolina Department of Environment and Natural Resources 127 Cardinal Drive, Wilmington NC 28405 (910) 796-7307 FAX (910) 350-2004 t�l Request for Express Permit Review , FILL-IN all information below and CHECK required Permit(s). FAX or email to Cameron. Weaver@ncmail.net along with a narrative and vicinity map of the project location. Projects must be submitted by 9:00 A.M. of the review date, unless prior arrangements are made. APPLICANT Name —Steve Shuttleworth„ Authorized Agent Company _Colorado Coastla Development Copany Address-7741 Market Street, Suite I City/State_Wilming ton, NC_Zip_28405_ County —New Hanover Phone_910-686-4194 Fax_910-686-0733 Email steveshutt@aol..com PROJECT Name —Sunset Marina (Town Homes) PROJECT SYSTEM(S) TRIBUTARY TO_Calabash_(STREAM NAME) _Lumber River RIVER BASIN ENGINEER/CONSULTANT Company JBS Consulting, PA Address 7332 Cotesworth Drive City/State—Wilmington, NC Zip_28405 County —New Hanover Phone_910-619-9990 Fax_910-401-1620 Email_bradsedgwick@hotmail.com ----------------------------------------------------------------------------------------------------------------------------------- State or National Environmental Policy Act (SEPA, NEPA) — EA or EIS Required ❑ Yes XNo ----------------------------------------------------------------------------------------------------------------------------------- ❑ STREAM ORIGIN Determination; # of stream calls; Stream Name ❑ STORMWA TER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other Wetlands MUST be addressed below ❑ Low Density -Curb & Gutter X High Density -Infiltration ❑ Off Site -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- X COASTAL ❑ Excavation & Fill ❑ Bridges &Culverts ❑ Structures Information MANAGEMENT - - - - - - - - - - - - - - - - - - ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront X Demo Only - - - - - - - - - - - - - - - - - - - - X LAND QUALITY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - X Erosion and Sedimentation Control Plan with 1.15 acres to be disturbed. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- WETLANDS (401) Wetlands on Property X Yes ❑ No Isolated Wetlands on Property X yes ❑ No Check all that apply Wetlands Will Be Impacted ❑ Yes X No Wetland Impacts: _0 Acre(s) Wetlands Delineation has been completed ❑ Yes ❑ No ❑ Buffers Impacted: Acre(s) USA COE Approval of Delineation completed ❑ Yes ❑ No 404 Application in process w1USACOE ❑Yes []No I Permit received from USACE ❑Yes ❑No ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 401 Application required ❑Yes X No If Yes, ❑ Regular ❑ Express Additional fees, not to exceed 50% of the original Express Review permit application fee, may be charged for subsequent reviews due to the insufficiency of the permit applications. SUBMITTAL DATES SW CAMA LOS 401 , For DENR use only Fee Split for multiple permits; Total Fee Amount $ INFILTRATION SITE VISIT REQUEST Name of the Project Location (attach a clear vicinity map): C j C orE� Street address, SR number, community, etc. Directions from the nearest major intersection: /l i'v 1 4 t N _� 1 c)�Ii ce; AC 17 Z_`F i N Ne-30 Owner/Applicant Name: Consultant Name: Consultant Contact Information: Phone, fax, email, etc, Existing ground elev. @basin/trench= SHWT elev.= SHWT plus 2' (max. bottom elev.)= DaterFime of Soils Investigation : ly - 1-101 - #1 #2 #3 #4 #5 #6 #7 #8 Summary/Comments: JAj v0 4- v c U _J 1,� j Ii r �'J 751�5i� S A &-; D ., / _ -3 t 0 :?::�7 E ."J _Il'3"J , 1 L 5 ) /S All proposed infiltration areas and existing, active utility lines located within the proposed basin/trench must be marked and flagged, If these areas are not flagged, the Soils Scientist reserves the right to decline to do the investigation- If the proposed infiltration system will be located in an area of existing pavement and there is no open area nearby, equipment capable of breaking through the impervious layer must be provided. The soils investigation does not take the place of a soils report prepared by an appropriate professional. The Soils Scientist will only verify the soil conditions that are reported in the Soils Report, and make a determination as to the suitability of the site to meet the infiltration design requirements under NCAC 2H.1000, and assumes no liability should the system fail. C -disr Buy I km . - -j ro swoo d k LD N iza r+ns tc'ad, Trace- 4o JI 'M bd� Ar J� C, -Sunsbt Beach Y-o c. River ;if r C If Clh m u Lvst, t o nin c ENGINEERING CONSULTIX6 SERVICES, LTD. 3i Geotechnical • Construction Materials m Environmental December 16, 2005 Mr. Brad Sedgwick JBS Consulting 7332 Cotesworth Drive Wilmington, North Carolina 28405 Re: Infiltration Evaluation Sunset. Marina Sunset. Beach, North Carolina ECS Project No. 22.11764 Dear Mr. Sedgwick, Engineering, Consulting Services, Ltd. (ECS) recently conducted an inRltration evaluation for .the proposed infiltration ponds at the proposed Sunset Marina at. 1358 Beach Road in Sunset Beach, North Carolina. This letter, with attachments, isthe report of our investigation. FiOd,Iuvestigations On December: 12, 2005, ECS conducted an investigation of the subsurface soil and ground water conditions at the'three requested locations shotvn.on the attached Site Diagram., The purpose of this investigation was to obtain subsurface information. of the suitability of the in - place soils for the proposed infiltration ponds. We investigated the subsurface soil and ground water conditions by advancing three hand auger borings into the existing ground surface at the requested test locations. We visually classified 'the subsurface soils and obtained representative samples of each soil type encountered. We also recorded the bmound Water.level observed at the time of the hand auger- boring. The attached Infiltration Evaluation Form provides a summary of -the subsurface conditions encountered at the hand auger boring locations. Ground water was encountered at the time of our exploration at test location #1 at a depth of 36 inches and at test location #3 at a depth of 72 inches below the existing grade elevation. The seasonal high ground water level (SHWL) was estimated to be at a depth -of 36 inches for test locations #1 and at a depth of 70 inches below existing surface grade for test locations #3. Ground water- and the MWL were not encountered at test location �#2 were the, boring was terminated at 48 inches due to encountering a very stiff clayey soils. We hiive°.conductedinfiltration tests near our hand auger borings to estimate infiltration rates for the, subsurface soils. The infiltration tests were requested to be conducted at two and four feet at each test location. The four foot infiltration tests were not conducted at locations#1 and #2 due to saturated soil conditions and non permeable clay soil conditions, respectively. The results of the tests.are summarized on the Infiltration Evaluation Form and are also listed below. 721 1 Ogden Busine5� Park • Suite 201 " Wilmington, NC; 2841 1 ° 010) 686-91 14 • Fax (9-10) 686-9666 N Infiltration E�atuatiori Stlnset.Marina Sunset Btrach, Norih.Carolina ECS Project No. 22.1 1764 Field Test Results At test location {rl, the infiltration test was performed at 24 inches in a tan fine SAND and indicated a calculated infiltration rate of 0.15 inches per minute (8.9 inches per hour). At test location #2, the infiltration test was performed. at 24 inches in a brown silty SAND and indicated a calculated infiltration rate of 0.007 inches per minute (0.4 inches per hour). At test location 43, the first infiltration test was 'performed at 24 inches in a tali fine SAND and indicated a 'calculated -infiltration rate.. of 0.15 inches per nunute (8:7 inches per hour), and the second it�ltration. test was performed at 48 inches in a tan fine SAND and indicated an infiltration rate of 0.13 inches per minute (7.9 inches per hour). If you leave any, questions. regarding this report, please contact us at (910) 686-91 14. Respectfully, ENGINEERING CONSULTING SERVICES, LTD. K. Brooks Wall Staff Geologist Attachments: Site Diagram . infiltration Evaluation Walid M.. Sobh, 3. E. Principal r3ngineer NC License No. 22983 4 1 WrtnO ♦� 't ` 1 i I � _ Q..� t...s r! I 'E III• I IL f —51ca _ I .11' ie p° I Y •� �-• � f I Q I Ei. 7 4 y rf RIO , s � €9 IL `mil t D. Brd $tonalanC "'-.•+rer y , � /• 'Pr/.ua - Map Cab. •P, P9• 2a8 `• :� y 3� da d •�• € diE ► a #;4' �� 7i E !I Q e; r� g�5g: �gp6gr E 6�d d�a�13 Y. '79l1�ggrf l�EdpE �s E,°EgA �E 4� 3 ;QIE 9¢9 �1 1 aDd E�^ ;d; � �'3 $ e7 ` I a 62vA �`�"-t s 9i �$a� s �d4�gj4 tl gf�� € pill Q! $q AEC E ■ # gg g rA" y v$" € Ei g d!?� ,�9� a x ..nQ k•r —yi'A a;r Rye di E: { � E �� °JE E •viC �x C er% x� YF gf��E yd! i��ap all e d F[R C �d � �E el�y° a� ITa• CF@ '� s! ,�,����.11 ��p q gEz 8y8p yr 9yy A 3 k E ty— 7 sa d� de ; .C�p;d f� � PRELIMINARYPLAT CONSULTING. PA JES mr+eR+n vc igri .•� — SUNSET MARINA faralerosw u Fu �➢10! rOfnRY rrlTtaY.� re•y.•.y _ _ mM['nen �vwpYM r Infiltration Evaluation. Sunset Marina Sunset Beach, North Carolina. ECS Project No. 22.11764 December 12, 2005 Location Depih Soil Descri ti.on. # l 0-6" Dark Grey silty SAND 6"-12" Orange Clayey SAND 12"-36" Tan Mine SAND 36"48' Saturated Orange CLAY with little sand Seasonal High Water Table was estimated to be at 36" below the existing grade elevation. Infiltration Rate: 0.15inches per minute (8.9 inches per hour) Test was conducted at 24 inches. #2 0-6" Dark Grey silty SAND 6"-24'' Tan Silty SAND 24"-48 Stiff Orange CLAY Seasonal High Water Table was not identified up to 48" below land surface. Infiltration Rate: 0.007 inches per minute (0.4 inches per hour) Test was conducted at 24 inches. #3 0-6" Dark Grey silty SAND 6"-72" Tarr fine SAND Seasonal High Water Table was estimated to b_ e at 70 below the existing grade elevation. Infiltration Rate at 24 inches: 0.15 inches per ininute (8.7 inches per hour) Infiltration Rate at 48 inches: 0.13 inches per minute(7.9 inches per hour) State Stormwater Management Systems Permit No. SW8 060308 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Mr. Steve Shuttleworth & Colorado Coastal Development Company Sunset Marina 1358 Beach Drive, Calabash - Brunswick County FOR THE construction, operation and maintenance of 2 infiltration basins and 1 bioretention area in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules") and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit. This permit shall be effective from the date of issuance until April 21, 2016, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.6 & 1.7 on page 3 of this permit. Infiltration basin 1 has been designed to handle the runoff from 8,513 square feet of impervious area. Infiltration basin 3 has been designed to handle the runoff from 4,409 square feet of impervious area. The bioretention area has been designed to handle the runoff from 10,542 square feet of impervious area. Each BMP must be operated with a 50' vegetated filter. 3. The tract will be limited to 28,132 square feet , as per approved plans. There is no impervious area available for future development in this permit. 4. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. Page 2 of 8 State Stormwater Management Systems Permit No. SW8 060308 5. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. 4,668 square feet of existing impervious area will be allowed to remain untreated. 6. The following design criteria have been provided in the infiltration basin and must be maintained at design condition: 7 Ohits ,Basin #1' ' Basin#3 Drainage Area Onsite Offsite Acres ftz ft2 0,21 0.21 0 0.12 0.12 0 Total Impervious Surfaces ft 8,513 4,409 Basin Depth feet 1.5 1.5 Desi n Storm inches 1.5 1.5 Bottom Elevation FMSL 12.0 13.5 Permitted Surface Area Bottom ft2 440 193 Permitted Storage Volume ft3 990 524 Storage/Bypass Elevation FMSL 13.5 15.0 Expected Infiltration Rate inlhr 8.9 8.7 Time to Draw Down hours .126 .156 Type of Soil r°x, y'£ Pactolus soil type Receivin Stream -P:.: '_';=' . Calabash River stream River Basin Lumber river basin Stream Index Number 15-25-13 stream index # Classification of Water Body "SA;HQW" I "stream class" 7. The following design criteria have been provided in the bioretention area and must be maintained at design condition: Units BioretentionAreai Drainage Area Onsite Offsite Acres ft2 ft2 0.30 0.30 0 Total Impervious Surfaces ft2 10542 Max Ponding Depth feet 1 Design Storm inches 1.5 Bottom Elevation FMSL 13.0 Permitted Surface Area @Bottom ft2 1048 Permitted Storage Volume ft 1260 Storage/Bypass Elevation FMSL 14.0 In -Situ Soil Infiltration Rate inlhr 0.40 Time to Draw Down hours 36.01 Total Required Plants Woody Shrub stems 24 6 18 Mulch Layer Depth inches 3 Receiving Stream stream River Basin river basin Stream Index Number stream index # Classification of Water Body "stream class" Page 3 of 8 State Stormwater Management Systems Permit No. SW8 060308 8. The planting soil media for the bioretention area must be a loam, sandy loam or loamy sand as described by the USDA soil textural triangle and as described on the approved plans. The minimum infiltration rate of the planting soil must be 0.52 inches/hour. The planting soil media in the bioretention area must maintain nutrient levels adequate fbr the growth of the plant species specified on the approved plans. II. SCHEDULE OF COMPLIANCE The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of bypass structure, infiltration media, flow spreader, catch basins, piping and vegetated filter. g. A clear access path to the bypass structure must be available at all times. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 6. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 7. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. The bioretention area may not be used as a sediment and erosion control device once the planting soil has been placed. 8. Access to the stormwater facilities shall be maintained via appropriate easements at all times. Page 4 of 8 State Stormwater Management Systems Permit No. SW8 060308 9. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 11. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 12. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. Ill. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. Page 5 of 8 State Stormwater Management Systems Permit No. SW8 060308 6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 7. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 8. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 9. The permittee shall notify the Division any name, ownership or mailing address changes within 30 days. Permit issued this the 21st day of April, 2006. NORT,KCAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION for A[an W. Klimek P.E., Director Division of Water Quality By Authority of the Environmental Management Commission Page 6 of 8 State Stormwater Management Systems Permit No. SW8 060308 Sunset Marina Stormwater Permit No. SW8 060308 Brunswick Countv Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL Page 7 of 8 State Stormwater Management Systems Permit No. SW8 060308 Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. .3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure weir elevation is per the approved plan. 6. The bypass structure is located per the approved plans. 7. A Trash Rack is provided on the bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office Delaney Aycock, Brunswick County Building Inspections Page 8 of 8 C200601700358 SOSID: (1823045 Date Filed: 1/20/2006 8:13:00 AM Elaine F. Marshall North Carolina Secretary of State C200601700358 State of North Carolina Department of the Secretary of State APPLICATION FOR CERTIFICATE OF AUTHORITY Pursuant to §55-15-03 of the General Statutes of North Carolina, the undersigned corporation hereby applies for a Certificate of Authority to transact business in the State of North Carolina, and for that purpose submits the following: I. The name of the corporation is COLORADO COASTAL DEVELOPMENT COMPANY; and if the corporate name is unavailable for use in the State of North Carolina, the name the corporation wishes to use is: NIA 2. The state or country under whose laws the corporation was organized is: COLORADO 3. The date of incorporation was JANUARY 7, 2004, its period of duration is: PERPETUAL. 4. Principal office information: (Select either a or b.) a. The corporation has a principal office. The street address and county of the principal office of the corporation is: Number and Street 7741 MARKET STREET, UNIT I City, State, Zip Code WILMINGTON, NC 28411 County NEW HANOVER The mailing address, if different from the street address, of the principal office of the corporation is: b. The corporation does not have a principal office. 5. The street address and county of the registered office in the State of North Carolina is: Number and Street 7741 MARKET STREET, UNIT I City, State, Zip Code WILMINGTON, NC 28411 County NEW HANOVER b. The mailing address, if different from the street address, of the registered office in the State of North Carolina is: 7. The name of the registered agent in the State of North Carolina is: STEVE SHUTTLEWORTH C200601700358 8. The names, titles, and usual business addresses of the current officers of the corporation are (attach if necessary): Name Title Business Address RENE MONDEJAR, III PRESIDENT 620 SOUTH CASCADE:, SUITE 101, COLORADO SPRINGS, CO 80903 H. LOWELL MOORE VICE-PRESIDENT 620 SOUTH CASCADE, SUITE 101, COLORADO SPRINGS, CO 80903 STEVE SHUTTLEWORTH VICE-PRESIDENT 7741 MARKET STREET, UNIT I, WILMINGTON, NC 28411 Attached is a Certificate of Existence (or document of similar import) duly authenticated by the Secretary of State or other official having custody of corporate records in the state or country of incorporation. The Certificate o Existence must be an original and less than six months old. APPLICATION FOR CERTIFICATE OF AUTHORITY 10. if the corporation is required to use a fictitious name in order to transact business in this State, a copy of the resolution of its board of directors, certified by its secretary, adopting the fictitious name is attached. 11, This application will be effective upon filing, unless a delayed date and/or time is specified: This is the � day of January, 2006. NAME OF CORPORATION COVMndcj*ar, COA AL DEVELOPMENT COMPANY By:Ren11 , Pres nt NOTES: ]tiling fee is $250. This document must be filed with the Secretary of State. C200601700358 --� OFFICE OF THE SECRETARY OF STATE OF THE STATE OF COLORADO CERTIFICATE 1, Ginette Dennis, as the Secretary of State of the State of Colorado, hereby certify that, according to the records of this office, COLORADO COASTAL DEVELOPMENT COMPANY is a Corporation farmed or registered on 01/07r2004 under the law of Cobrado, has complied with all applicable requirements of this office, and is in good standing with this office. This entity has been assigned entity identification number 2004IM4647 . This certificate reflects facts established or disclosed by documents delivered to this office on paper through 01/06020M that have been posted, and by documents delivered to this office electronically through 01/11/2006 @ 19:27:43 I have affixed hereto the Great Sea] of the State of Colorado and duly generated, executed, authenticated, issued, delivered and communicated this official certificate at Denver, Colorado on 01/11/2006 @ 19:27:43 pursuant to and in accordance with applicable law. This certificate is assigned Confirmation Number 6388173. Secretary of State of the State of Colorado 0*0assoso4*08w*srss00ss*saw0arar00s0000Ed ofCa6fiede"o040ofgo0s*f•sr00006e*s*a0so00aeae000s fttk# i'if WOW. ¢r m opdam dr Lvmnm ad vdift, ofa coVIcaa o ttlttwf shun kagy sw be rma &%Pd by.kAbw d w C- -0 CP#Vm d- Pw 4f the Secretary ojState's Web s11e, t //www.sossra e.ca ns/bir/ i r are.Searc rit iadv eniering the cenfcafe s cortJirmation number &Whptd an Ow wr4lcaw, awd fbaewlr# do ltswraWw d4pf*vd Cexaftdrl:»k imkwY eta eerdfic= is mere& oydad and Is not necessary to the valid and efecitve kiiiamc via cerf&W For more lrl/ormatton, visit our Web rite, http://www.sas.siate.co.uS/ click Business craerr and sawt "Froil wtrbp Add orut►onr. CHRT GS ❑ Revised 09r'27l S TopoZone - The Web's Topographic Map Page 1 of 1 52 ' h,_ YY Ey � • •• ✓V . I( •` • S . .^ ,.{ r�a F 1 �'" e 3 Pj 1 • � �` � b` • ft � ��; i � � ram' ��' �• a • 1Ib ♦•'st'r r ♦�11* 'S —t%� - .f jJ; ' r� ••''• : : ' S �•tea ." '`::%��i� .`' a i .�` 5�;' v , •• • �,^tr �,.. �• t ' �....ask '`, i� ^ s..,y✓�— :a_ I ,.'�.....rti.o �,�J. _r'^� / P3 �i'� 3 . i l '"�✓ . � .��''1 `���,� �,`--= _ i%-�'r,r`-'_r� � ,�,��-•-5.. _�-"�' mow'_--i'��� � � "` � / 1nr '' I.,i t° - Jf ,\_ .'il, `. ..d ��N ti.•i�•r J [ ti 61. `j �jp , r �,� YA �ii ' `='` �r� 1 ,..r�' f �,w !'�'r•;`b'��., �� 'iv r `�.r,.Y_. `'V"'�. �r �- u.� �� � `\.� •1 \ T ' -+';r, '""� •°"''�°�" J �' j• 0 t^ ter ^•-�""`•... zz,\4 r._11i�. .J,r t n �•� �i":"'� "� •�If"' : �� �1�> In ��\i�=+ _.I_�\ ��� .�-4r-.I�::� err <. f �.� l�n'sJ! :`F t4 ids"T� ��Tr i �♦ f� r �,1�� . 4 �� , �0� yid -���F �,. ,! �•, / N;:,�t61�.es' •�i-srh'..r� I' �t a• oaf :.} "'1��.....�: jf, �,'`��\.���� / ti.: � . i L� � _ - �� s J i'�• � r•SS��\�`� t . � s� r% "fir / - \ �'�S ���,.� "..""",.,,_ ` �,t� •g •' T f � a / •ter � � . ,/h /Jj�r•� �,� r1w�1�e� (`0`�;•T`.. ; :�• •:', r ~rJ�/��ie�.�r±Kwi �.�•v,� �4 �t•�...'; .� �.•Boat Pram Nec 0 0.3 0.6 0.9 1.2 1.5 km G 0 0.1 0.2 0.3 0.4 0.5 mi Map center is 330 53' 17"N, 780 33' 00"W (WGS84/NAD83) Calabash quadrangle M=-$.461 Projection is UTM Zone 17 NAD83 Datum G=1.367 http://www.topozone.com/print.asp?z=17&n=375243 7.28409553&e=726575.079147845&... 3/16/2006 NC DENR - DIVISON OF WATER QUALITY .0310 LUMBER RIVER BASIN classification Name of Stream Description Class Date Index No. Calabash River From source to North SA;HQW Carolina -South Carolina State Line Hangman Branch From source to Calabash SA;HQW River Atlantic Ocean The waters of the Atlantic SB Ocean contiguous to that portion of the Waccamaw River Drainage Area of the Lumber River Basin extending from the Cape Fear River Basin to the North Carolina -South Carolina State Line 12/01/63 15-25-13 12/01/63 15-25-13-1 12/01/63 99-{I) 2B .0300 + This symbol identifies waters that are subject to a special management strategy specified in 15A NCAC 2B .0225 the Outstanding Resource Waters {ORW) rule. Note: "CA" means critical area. 22 Permit No. (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM INFILTRATION BASIN SUPPLEMENT This form may he photocopied for use as an original _DWQStormwater Mannement Plan Review: A complete stormwater management plan submittal includes a stormwater management permit' application, an infiltration basin supplement for each system, design calculations, soils report and plans and specifications showing all stormwater conveyances and system details. I. PROJECT INFORMATION Project Name : V 0JG 1 Contact Person: N 'ri pi Clow", tk>- tj 1 c6 , 7 C Phone Number: ` )b 61 `l' `9 70 This worksheet applies to: Basin No. _ Z- _ in Drainage Area (as identified on plans) Z (from Form SWU-101) 11. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Soils Report Summary Soil Type Infiltration Rate SHWT Elevation Basin Design Parameters Design Storm Design Volume Drawdown Time Basin Dimensions Basin Size Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation inl r cf/hr/sf (circle appropriate units) fmsl (Seasonal High Water Table elevation) �inch c.f. •.� days C] ft. x c.f. 3 fmsl 1 fnisl finsl (1.5 inch event for SA waters, I inch event for others) fk = l ��� sq. fk (bottom dimensions) &" , 1 S U G,S HL REQUIRED JTEMS CHECKI.1<ST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, Febnwy 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate that the following design requirements have been met and supporting documentation is attached If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. Attach justification if a requirement has not been met. Applicants Initials a. System is located 50 feet from class SA waters and 30 feet from other surface waters. VL b. System is located at least 100 feet from water supply wells- .11? c. Bottom of system is at least 2 feet above the seasonal high water table. d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. e. System is not sited on or in fill material or DWQ approval has been obtained. f System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way- g. Drainage area for the device is less than 5 acres. h. Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is attached. ( i. System caphnres and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas draining to SA waters ). Design volume and infiltration calculations attached. j. System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage. Calculations attached. k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H: V). 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided m. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches or dense vegetative cover is provided 2 n. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum length is 50 feet for SA waters, 30 feet for other waters). c o. Flow distribution mechanism within the basin is provided. �— p. A benchmark is provided to determine the sediment accumulation in the pretreatment device. q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided). r" System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days. A soils report and all pertinent draw -down calculations are attached. s. Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized. Form SWU-103 Rev 3.99 Page 2 of 3 • IV. INFILTRATION BASIN OPERATION AND MA MNANCE AGREEMENT 1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion, trash accumulation, vegetative cover, and general condition. 2. Repair eroded -areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetated cover to maintain a maximum height of six inches, and remove trash as needed. 3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow structures for blockage and deterioration. Remove any blockage and repair the structure to approved design specifications. 4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over -excavating. Over -excavating may cause the required water table separation to be seduced and may compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.). A benchmark shall be established in the pretreatment unit. The benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the design depth reads O. af feet in the pretreatment unit, the sediment shall be removed from both the pretreatment emit and the infiltration basin. 5. If the Division determines that the system is failing, the system will immediately be repaired to original design specifications. If the system cannot be repaired to perform its design £unction, other storarwater control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed. I acknowledge and agree by my signature below that I am responsible for the performance of the five maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print Name and Title: '�-rFEV} F.r1 7 Address:_' Date_ _ , Z? -,2 e _ Note.- The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a , ( resident of hye}�subdiviission has been named the president. I, (l �t_ P ! ! l U,I�T, a Notary Public for the State of kde- &CC,&-6 U Y1 Q , County of HWgOyer+r , do hereby c�;ertify that fly appeared be ore me this d3 day of 0(, , and acknowledge the due execution of the forgoing ir► itration basin maintenance requirements. Witness r"{p official seal, P. M&. ���4 Y*AA'(- s1W ,> t�otarV1 . 6 ' My commission expires �� a Public �Q�4•V = Forrff ��9 Page 3 of 3 '��t1111l1it��,`