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HomeMy WebLinkAboutSW7970407_HISTORICAL FILE_20070604NORTH CAROLINA Department of Environmental Qual STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SWl CUy DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMM D Quible Quible & Associates, P.C. ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SUR,(EMNG SINCE 1959 May 31, 2007 Mr. Samir Dumpor, PE Environmental Engineer North Carolina Division of Water Quality 943 Washington Square Mall Washington, NC 27889 Re: Stormwater Review SW7970407 Renewal Graveyard of the Atlantic Museum Dare County Dear Mr. Dumpor: G-11ECIETYEDD JUN 0 41007 P.O. Drawer 87o KHfy Howk. NC 27949 Phone, 252-261-3300 Fax: 252-261-1260 PRINCIPALS Sean C, Boyle, P.E. Joseph S. Losster. C.E.P. Eouartlo J. MaIdMeso. P.E. ASSOCIATES Joseph J. Anlouf, P E. Kafherine C. Marchello. P.L.S. VIA FEDERAL EXPRESS In response to your May 4, 2007 request for additional information for the referenced stormwater permit renewal, please find enclosed: One (1) complete set of signed and sealed Record Drawings. Set consisting of two sheets, C3 Grading & Drainage Plan and C4 Site Work Details. One set of signed and sealed calculations that show total built upon area, provided storage volume and number of infiltration basins. Note that basin bottom and top of storage elevations are indicated on the above mentioned sheet C4. One copy of circa 2003 color aerial plot of the Graveyard of the Atlantic Site. Note, improvements field corroborated via on -site visual observation conducted on May 16, 2007. Thank you for your continued attention to this renewal request. Please contact if you have any questions or need additional information. Otherwise, on behalf of the Graveyard of the Atlantic Museum, we look forward to receipt of the renewal permit. Sincerely, QUIBLE & ASSOCIATES, P.C. Eduardo . Valdivieso, P.E. Vice President cc: Joseph K Schwarzer, Ex. Director, Graveyard of the Atlantic Museum, Inc. u GRAVEYARD OF THE ATLANTIC MUSEUM SW7970407 RENEWAL STORMWATER CALCULATIONS May 29, 2007 A. Run-off from existing impervious surfaces sheet flows to vertical curbing where it is conveyed to dry infiltration basins by concrete flumes with NCDOT Class A erosion control stone installed as shown on enclosed "Record Drawing". B. There are 3 drainage areas on this project. See attached Exhibit A for drainage and basin area orientation. I . Drainage Area #1 is the main parking lot ,associated concrete walks, and west and north west portion of exiting structure. Stormwater runoff from Area 1 is captured and treated in infiltration basin IB 1. a. Built upon area draining to IB I: Asphalt & Concrete = 69,345 sq.ft. West Wing of Museum = 3,752 sq.ft. Future Museum Expansion = 3,400 sq.ft. Total built upon area in Drainage Area #1 = 76,497 sq.ft b. Volume retained in IB I from Drainage Area#I built upon area: Above ground basin volume = 28,764 cu.ft. * 28,764 cu.ft. _ 76,497 sq.ft. = 0.37 feet or 4.51 inches SA water required to retain first 1-'/z" ** We are treating 3.01 times what is required for Drainage Area #1 2. Drainage Area #2 consists of the remaining asphalt (access loop for loading area), the loading dock, adjacent concrete walk and the future theater expansion area. Stormwater runoff from Area 2 is captured and treated in infiltration basin I132. a. Built upon area draining to IB2: Asphalt = 4,692 sq.ft. ,aaaaaOR.CARoi ESSI °.q - Concrete = 500 sq.ft. � OE ON . Future Theater Area = 1,050 sq.ft. �EAL �P Total built upon area in Drainage Area #2 = 6,242 sq. ft. ' tr 18723 d w .y .::,.• V 1 b. Volume retained in I132 from Drainage Area #2 built upon area: �d• ° * 2,825 cu.ft. - 6,242 sq.ft. = 0.45 ' or 5.4 inches b� ti13� l Stormwater SW7970407 Renewal May 29, 2007 Page 2 of 2 ** We are treating 3.60 times what is required for Drainage Area #2 3. Drainage Area #3 consists of the museum building (exclusive of west wing itemized in line item 1) and concrete deck in front of the building. Stormwater runoff from Area 3 is captured and treated in infiltration basin I133 a. Built upon area draining to I133: Museum Building = 15,046 sq.ft. Concrete Deck = 3,400 sq.ft. Total built upon area in Drainage Area #3 = 18,446 sq.ft. b. Volume retained in I133 from Drainage Area #3 built upon area: * - 4,590 cu.ft. _ 18,446 sq.ft. = 0.25 feet or 2.98 inches ** We are retaining 2.0 times what is required for Drainage Area #3 4. Summary: Total Built Upon Area = 101,185 sf Required treatment/storage volume (1.5") = 12,648 cf. Provided above ground treatment/storage volume (4.3") = 36,179 cf.* Total number of infiltration basins: 3 *Note: Based on current DWQ policy, provided storage volume calculation did not take into account storage volume available in soil voids between seasonal high water table and bottom of basin elevation. This volume was claimed in the original stormwater permit. For general comparison proposes only, if the soil void storage volume were made a part of the current provided storage volume calculation, soil void space would add approximately 14,000 cf to the total amount (+/- 50,000 co. f lii -; ► ► I x w i' i I I 1 I I II I I I 1 I II I e. IL 6 P k w" WIN W! x w 44, r r 16 � F Io m rfi c W A TF9 Michael F. Easley, Governor �pI ' QG William G. Ross Jr., Secretary WV r North Carolina Department of Environment and Natural Resources �� � 1 "'C Alan W. Klimek, P.E. Director Division of Water Quality May 4, 2007 Graveyard of the Atlantic Museum Mr. Joseph K. Schwarzer, Ex. Dir. P.O. Box 191 Hatteras, NC 27943 Subject: Stormwater Review SW7970407 Renewal Graveyard of the Atlantic Museum Dare County Dear Mr. Schwarzer: This office received a request for renewal of permit SW7970407 on January 26, 2007.. The Site Inspection on March 1, 2007 resulted in issuance of a Notice of Violation (NOV) on March 13, 2007. This office received your itemized response to the above referenced NOV together with the response from Quible & Associates, P.C. on April 17, 2007. Since most of the items from NOV are addressed satisfactorily this office will not entertain the Assessment of Civil Penalties option, however in order to continue with the renewal of Stormwater Permit the following additional information is needed. 1. One (1) complete set of signed and sealed as -built plans, with all required details; 2. Please provide one set of signed and sealed supporting documents that includes the following: Calculations to show total impervious area, provided storage volume and number of infiltration basins; C Basin bottom and overflow elevations; The above requested information must be received in this office prior to June 4, 2007 or your application will be returned as incomplete. The return of this project will necessitate resubmittal of all required items including the application fee. If you need additional time to submit the required information, please mail or fax your request for time extension to this office at the Letterhead address. You should also be aware that the Stormwater Rules require that the permit be issued prior to any development activity. Construction without a permit is a violation of 15A NCAC 2H.1000 and North Carolina General Statute 143-215.1 and may result in civil penalties of up to $10,000 per day. Please reference the Stormwater Project Number above on all correspondence. If you have questions, please feel free to contact me at (252) 948-3959. Sincerely, = Samir Dumpor, PE Environmental Engineer Washington Regional Office cc: Eduardo Valdivieso, PE, Quible & Associates, P.C. k4ashington Regional Office North Carolina Division of Water Quality Washington Regional Office Phone (252) 946-6481 FAX (252) 946-9215 Internet: h2osnr.state.nc.us 943 Washington Square Mall, Washington, NC 27889 An Equal OpportunitylAffirmaflve Action Employer— 50% Recycled110% Post Consumer Paper Customer Service 1-877-623-6748 tCarolina urallil 30UUaritime History The Campaign to Build the Graveyard of the Atlantic Museum ivlr. Al Hodge, Regional Supervisor Surface Water Protection North Carolina Division of Water Quality 943 Washington Square Mall Washington, North Carolina 27889 Re: Notice of Violation (13 March 2007) Stormwater Project SW7970407 Gavevard of the Atlantic Museum Dare County Dear Mr. I -lodge: 011-ICE i ELU APR 17 2007 ®wQ-WARO On behalf of the Graveyard of the Atlantic Museum, this is a response to the above referenced Notice of Violation letter specifically the "HIGH DENSITY STATE STORMWATER INSPECTION REPORT", "SITE VISIT"', items: 7, 12, 15, and 26; and "COMMENTS" 2, 4, and 5. All other issues item 3 under"GENERAL QUESTIONS FILE REVIEW", item 9 under "SITE VISIT"; and items: 1, 3, and 6 under "CONDIMENTS", are addressed via written response directly to you from Mr. Eduardo J. Valdivieso, P.E., Vice -President, Quible Associates, P.C., the Museum's site engineers on this project. Items: 7, 12, and 15 under "SITE VISIT", and items 2, and 4 under"COMMENTS" deal specifically with: bank erosion, mowing, and vegetation/re-vegetation. As you are aware, the Museum is located on property belonging to the National Park Service (NPS), Cape Hatteras National Seashore. The Museum has a thirty (30) year Memorandum of Understanding (MOU) with the N'I S allowing the use of the land for the Museum. The NPS has been quite specific that we are not allowed to do any landscaping, planting, seeding, etc. and that all wetlands and native vegetation on the site be allowed to grow as they would in the natural environment of the seashore. We are allowed to mow and remove vegetation from the curb cuts to infiltration areas (around loose rocks), but all other areas must be left "natural". Some of the areas requiring re -vegetation are the result of construction activity, specifically the installation of parking lot and pathway lighting which was completed in January 2007. 1 am pleased to report that natural re -vegetation is occurring in these areas and should be complete by the end of summer. The fight front corner infiltration basin continues to be problematic in terms of bank erosion and re -vegetation. The area needs constant maintenance (at least once a month) and "natural beach vegetation is extremely slow to grow in this area (wind, blown sand, and erosion are factors �iratwY`rtl�rdic Ile Graveyard of the Atlantic Museum P.O. Box 191 • Hatteras, North Carolina 27943 • (252) 986 2995 • fax (252) 986 1212 e-mail museum@graveyardoftheatlantic.com • web site www.GraveyardohheAdantic.com Response to Notice of Violation (13 March 2007) Page 2 here). Under the terms of our MOU, all we can do is "let nature take her course" and sustain the area through constant maintenance. I am delighted to comply with any requirements of the NCDWC but, to be frank, we are on federal land, the NPS has told us what they require I am not in a position to dispute their instructions. Regarding "SITE VISIT", item 26, and "COMMENTS" item 5, pertaining to "Allainienaiice Records inusi be kepi of the O X, M cictiviiies cis require ui your permiP', I fully acknowledge the Museum's responsibility here and can only plead confusion. The May 12, 1997 cover letter from DEFINR Division of Water Quality notes we should "... pay special attention to the Operation and Maintenance requirements...". This was confused with the "WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT" which, unfortunately, does not mention the need for keeping maintenance records. As you can see from the report, all areas have been maintained to the fullest extent possible under the circumstances. Curb cuts and infiltration areas are inspected weekly to keep them clear of debris, sand, shells etc., and are thoroughly cleaned at least quarterly or more often as needed. Given the fact we are in a prime hurricane zone, the Museum takes this responsibility very seriously and we have been scrupulous in maintaining these areas (after Isabel, Museum grounds were the only place to land Helicopter support because we were "dry" and clear of debris). Needles to say, we are most embarrassed and have taken steps to rectify the situation. I am enclosing a copy of our recording format which will be kept in a separate, suitably marked binder and hope this will meet with your approval. We sincerely apologize for the misunderstanding and any inconvenience this may have caused. Thank you for your patience, attention, and cooperation in this matter. Sincerely, J eph [45r1 Sch(varzer, II Ex cutive Director Graveyard of the Atlantic Museum .. �`.., 'Well v FLUME DETAIL N.T.S. NOTES: 0 j'. 4 L9, \... b 1* • 2007 AREA ACTION TAKEN DATE 1 Removed all trash and debris, uncovered erosion control stone, 2/23 trimmed all vegetation around flume removed vegetation Used blower to clean flume, removed all trash and debris, 2/23 2 removed vegetation from erosion control stone, trimmed vegetatio from edges of flume. Used blower to clean sand and shell from flume and erosion 3 control stone. 2/23 Removed all trash and debris from area, trimmed vegetation 4 from erosion control stone and infiltration area. 2/23 Removed all trash and debris from area, trimmed vegetation 5 from erosion control stoneand infiltration area. 2/23 Removed all trash and debris from flume and erosion control 6 stone, used blower to clean sand from flume and stone, trimmed 2/23 ve etat ion Used blower to clean off flume and stone, removed vegetation from flume mouth and erosion control stone. 2/23 7 Removed trash and debris from flume, erosion control stone, 8 and infiltration area, trimmed vegetation from flume and 2/23 infiltration area. Removed trash, debris, and vegetation from flume and erosion 9 control stone, trimmed vegetation in infiltration area around 2/23 flume. Removed trash, debris and vegetation from flume mouth, flume, 10 and erosion control stone. 2/23 Removed trash and vegetation from flume and erosion stone, 11 trimmed vegetation from erosion control stone, from around flume 2/26 and adjacent curb areas. Removed trash, used blower to clear off sand, shells, and 12 loose vegetation; trimmed vegetation off erosion control stone 2/26 and edges of flume. Used blower to remove sand and shells from erosion control store 13 and flume; trimmed vegetation from flume, erosion control ston 2/26 and infiltration area. Removed trash from erosion control stone, and flume, trimmed 14 back vegetation from curb, flume, and erosion control stone. 2/26 Trimmed back vegetation from erosion control stone, flume, 15 and adjacent curb. Used blower to clear off sand and shell 2/26 iron the paved surfaces. Trimmed vegetation from erosion control stone and curb areas. 2/26 16 Removed trash and debris from flumes, erosion control stone, 17 and infiltration area; trimmed vegetation from flumes, stone, and infiltration area. 2/26 Cleaned out flume, dug out and repositioned erosion control stone, removed build—up of sand from around flume. Checked 2/26 18 depth of infiltation basin. Quible Quible & Associates, P.C. ENGINEERING • ENVIRONMENTAL. SCIENCES • PLANNING • SURVEYING SINCE 1959 April 16, 2007 Mr. Al Hodge, Regional Supervisor Surface Water Protection North Carolina Division of Water Quality 943 Washington Square Mall Washington, NC 27889 Re: Notice of Violation (13 March 2007) Stormwater Project SW7970407 Graveyard of the Atlantic Museum Dare County Dear Mr. Hodge: P.O. Drawer 870 Kiny Hawk, NC 27949 Phone: 252-261-3300 Fox. 252-261-1260 PRINCIPALS Sean C. Boyle, RE Joseph S. Lassiter. C.E.P. Eduardo J. Voldideso. P.E. REC DJoseph J cA nlout. L 5 KafF�erin5 "'� APR 17 2007 Via Overnight Delivery On behalf of the Graveyard of the Atlantic Museum, this is an itemized response to the above referenced Notice of Violation letter (copy attached) and specifically the "Comment" portion of respective "High Density: State Stormwater Inspection Report" contained therein. • Comment # 1: A copy of the recorded deed restrictions is not in the file as required. You should file a copy immediately." Response: Recorded deed restrictions are not a specified condition of permit number SW7970407. • Comment #2: "There are many areas in the infiltration trenches that need to be re -vegetated. " Response: Acknowledged. Partially attributable to recent site lighting installation work. In any event, this item will be addressed via written response directly to you from Graveyard of the Atlantic officials under separate cover. • Comment #3: "There were several inlets that were not shown on the approved plans. " Response: See response below for Comment # 6. Mr. Al Hodge April 16, 2007 Page 2 of 3 Comment #4: "The grass should be kept mowed as required in your permit. " Response: Acknowledged. Comment #5: `Maintenance records must be kept of the O & M activities as required in your permit' Response: Acknowledged. This item will be addressed via written response directly to you from Graveyard of the Atlantic officials under separate cover. • Comment #6., "Your facility was not built according to the submitted plans and specifications. " Response: From your perspective technically correct, however as evidenced by my October 2001 issuance of a "Designer's Certification" (copy attached) it was then and continues today to be my professional opinion that "construction was observed to be built within substantial compliance and intent of the approved plans and specifications." Please allow me to elaborate. Attached as Exhibit A find a copy of the "permitted" stormwater management plan dated 26 March 1997, entitled "Grading and Stormwater Management Plan; Graveyard of the Atlantic Museum" as prepared by Quible & Associates, PC. This plan was approved by DWQ on May 12, 1997. This plan authorized a built upon area of 2.3 acres with on -site mitigation of stormwater via multiple designated on -site infiltration areas with total treatment capacity (68,501 cf) well in excess of the 12,689 cf volume based on the 1.5" minimum required standard. In December 1999, the main parking lot configuration of the project was value engineered by Quible & Associates, P.C. to minimize the amount of import fill material, eliminate the costly network of drainage culverts, and linear interior traffic islands. Please consult Exhibit B. Note that the size of the western most infiltration basin was increased to compensate for the loss of the interior parking island infiltration areas. Built upon area did not increase and while the resultant on -site treatment capacity of the infiltration system in total was reduced to 46,954 cf, it was still well in excess of the aforementioned 12,689 minimum required volume. Exhibit C is an informative digital color aerial photography (circa 2003) plot of the Graveyard of the Atlantic site confirming as constructed layout. Mr. Al Hodge April 16, 2007 Page 3 of 3 In my professional judgement, these siting adjustments did not warrant a significant change to the intent of the original plans. In further support of this judgement call are the following affirmative findings recently itemized and made by your inspector on the respective 13 March 2007 State Stormwater Inspection Report: 1. Drainage area is consistent with the permit; 2. Built -upon area to drainage area is consistent with the permit; 3. All built -upon area (as permitted) is graded such that the runoff drains to the system. On behalf of the Graveyard of the Atlantic Museum, we respectfully request that the Washington Regional Office of the Division of Water Quality consider and accept the responses outlined above and subject to satisfactory review of forthcoming supplemental vegetation and maintenance related data directly from the Graveyard of the Atlantic, grant there request for renewal of permit SW7970407. Thank you for your attention to this matter. Sincerely, QUIBLE & ASSOCIATES, P.C. Eduardo J.b14ldivieso, P.E. Vice President cc: Mr. Joseph K Schwarzer, Graveyard of the Atlantic Museum n HIGH DENSITY STATE STORMWATER INSPECTION REPORT Project Name: The Graveyard of the Atlantic Museum Permit No: SW7970407 Expiration date: 5/12/07 Contact Person: Joseph K. Schwager, Exec. Dir. Phone No: 252-986-1212 County: Dare Center of Project GPS: Lat: Long: Facility Address: 59200 Museum Dr. City: Hatteras ZIP: 27943 (If multiple basins exist, specify basin(s): Entry. time: 1:30 am ❑ pm ® Exit time: 2:45 am ❑ pm Method of Treatment: (check one) ❑ Wet Detention ❑ Dry Detention ❑ Bioretention ❑ Wetland ❑ Sandfilter ❑ Swale ❑ Pocket Wetland ❑ Level Spreader ❑ Permeable Pavement ® Infiltration Basin. Other Receiving Waters: Classification: River Basin: GENERAL QUESTIONS FILE REVIEW 1. A signed copy of the Engineer's certification is in the files: 2. A signed copy of the Operation & Maintenance Agreement is in the files: 3. A copy of the recorded deed restrictions is in the files: SITE VISIT 1. Drainage area is consistent with the permit: 2. Built -upon area to drainage area is consistent with the permit: 3. All built -upon area (as permitted) is graded such that the runoff drains to the system: 4. The outlet structure is located per the approved plans: 5. The trash rack is provided on the outlet/bypass structure: 6. The trash rack is free of debris and excess trash: 7. All slopes are grassed with permanent vegetation: 8. Vegetated slopes are no steeper than 3:1 9. The inlets are located per the approved plans and do not cause short-circuiting of the system YES NO NA NE ❑ ❑ ® ❑ ❑ ® ❑ ❑ ® ❑ ❑ ❑ ❑ ® ❑ ❑ YES NO NA NE 10. Access points are clear and well maintained: ® ❑ ❑ ❑ 11. Forebay is free of excessive sediment: ❑ ❑ ® ❑ 12. Banks are stable with no erosion present: ❑ ® ❑ ❑ 13. Vegetation and trash have been removed as needed: ® ❑ ❑ ❑ 14. Drawdown device is correctly sized per the approved plans: ❑ ❑ ® ❑ 15. Grass is mowed (not scalped) as required: ❑ ® ❑ ❑ 16. All required parts of the system are provided (such as vegetated shelf and a forebay): ❑ ❑ ® ❑ 17. The swale or outlet bypass is in the correct place and is in good condition: ® ❑ ❑ ❑ 18. Vegetated shelf is 6:1 and properly vegetated: ❑ ❑ ® ❑ 19. Invasive species/tree control is provided as needed ® ❑ ❑ ❑ 20. Tree pruning, mulch and plant replacement are provided as needed in the bioretention basin: ❑ ❑ ® ❑ 21. Permeable pavement has had regular sweeping and vacuuming: ❑ ❑ ® ❑ 22. Gravel replacement is performed as needed: ❑ ❑ ® ❑ 23. Excessive landscape debris (grass clippings, leaves, & sediment) are controlled: ❑ ❑ ® ❑ 24. Large stemmed vegetation is kept off of the level spreader: ❑ ❑ ® ❑ 25. Sediment and debris is removed from behind the lip of the level spreader on a routine basis: ❑ ❑ ® ❑ 26. Maintenance records are available for inspection: 0 ® ❑ ❑ Island showing no curb cuts to allow Infiltration in front showing need for Side infiltration area not on plans use for infiltration as was on the plans additional vegetation Back infiltration area showing need of 0 & M Mowing what is there and re -vegetating as needed. Compliant ❑ Non -Compliant YES NO ® NOV sent B ❑ Date sent 1,5 , The Graveyard of Dare County Stormwater Permit the Atlantic Museum No. SW7970407 Designer's Certification VW Z zr /FSo as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, L for (Project) (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. Signa Regis Date E3 dTTALP. 2. 111 Of WA7ER s'Ul,9c,� `T'/ Michael F. Easley, Governor 13 �G William G. Ross, Jr., Secretary ( North Carolina Department of Environment and Natural Resources Y Alan W. Klimek, P.E. Director Division of Water Quality ryy REUENFED nusvp�u SURFACE WATER PROTECTION SECTION COASTAL STORMWATER PERMIT RENEWAL APPLICATION FORM JAN 2 3 2007 I. CURRENT PERMIT INFORMATION:. DWQ-WARD 1. Stormwater Management Permit Number: SW7970407 NV 2. Permit Holder's name: GRAVEYARD OF THE ATLANTIC MUSEUM 3. Signing official's name:JOSEPH K. SCHWARZER Title: EXECUTIVE DIRECTOR (person legally responsible for permit). 4. Mailing address: P. O. BOX 191 City: HATTERAS State: NC ZipCode: 27943 Phoner252)986-2995 FAX:(252) 986-I2I2 (Area Code and Number) (Area Code and Number) 5. Project Name: GRAVEYARD OF THE ATLANTIC MUSEUM 6. Location of Project: (street address) 59200 MUSEUM DRIVE HATTERAS, NC 7. Directions to Project (from nearest major intersection) POIIOW THE NC"ET]Y SPAR STRATGBT TO RAMP 5S. MUSEUM IS ON THE RIC:HT II. PERMIT INFORMATION 1. Specify the type of stormwater treatment (wet pond, infiltration, etc.): INFILTRATION 2. List any changes (from project that was originally approved, attach additional pages if needed) NONE 3. Do you have a copy of the original Operation and Maintenance Agreement? YesX No_ Applicant's Certification: l,, (print) Joseph K. Schwarzer certify that the information included on this permit renewal Application is to the best of my knowledge, correct and complete. Signature:-4, � Date:01/20/07 Submit thid completed form along with an application fee of $420.00 and a copy of the designer's Certification to the address listed below. North Carolina Division of Water Quality 943 Washington Square Mall Phone (252) 946-6481 Customer Service 1-877-623-6748 One Washington Regional Office Washington, NC 27889 FAX (252)946-9215. Internet: h2o.encstate.nc.us N0it11Ci1r011na An Equal Opportunity/Affirmative Action Employer- 50% Recycled/10%a Post Consumer Paper )Vnturally Michael F. Easley, Governor i William G. Ross Jr., Secretary rNorth Carolina Department of Environment and Natural Resources ti � Alan W. Klimek, P.E. Director Division of Water Quality July 27, 2006 Graveyard of the Atlantic Museum Attn: Mr. Joseph Schwarzer PO Box 191 Hatteras, NC 27943 Subject:: Stormwater Permit No. SW7970407 Graveyard Atlantic Museum Building Dare County Dear Mr. Schwarzer: The Division of Water Quality issued a Coastal Stormwater Management Permit, Number SW7970407 to Graveyard of the Atlantic Museum for Graveyard Atlantic Museum Building on May 12, 1997. This permit expires on May 12, 2007. Section .1003(h) of 15 A NCAC 2H .1000 (the stormwater rules) requires that applications for permit renewals shall be submitted 180 days prior to the expiration of a permit and must be accompanied by a processing fee, which is currently set at $420.00. If this is still an active project please complete and submit the enclosed renewal application in a timely manner. If this project has not been constructed and a permit is no longerneeded, please submit a request to have the permit rescinded. If you have sold the project, or are no longer the permittee, please provide the name, mailing address and phone number of the person or entity that is now responsible for this permit. Enclosed is a form for change of ownership, which should be completed and submitted if the property has changed hands. Your permit requires that upon completion of construction and prior to operation of the permitted treatment units a certification of completion be submitted to the Division from an appropriate designer for the system installed. This is to certify that the permitted facility has been installed in accordance with the permit, the approved plans, specifications and supporting documentation. Please include a copy of the certification with your permit renewal request and processing fee. Enclosed is a copy of a sample certification. Also enclosed is a new Operation and Maintenance agreement that should be completed and submitted along with your renewal application. You should be aware that failure to provide the Designer's Certification and the operation of a stormwater treatment facility without a valid permit, are violations of NC General Statute 143-215.1 and may result.in appropriate enforcement action including the assessment of civil penalties of up to $10,000 per day. If you have any questions, please feel free to contact us at 252-946-6481. Si erely Al Hodge, Re io upervisor Surface Water Protection Section Washington Regional Office Enclosures cc: Quible. & Associates, Inc. Washington Regional Office,' North Carolina Division of Water Quality - Internet: www.newateraualitv.ore 1��One 943 Washington Square Mall Phone (252) 946-6481 1� O Carolina Washington, NC 27889 Fax (252) 946-9215 Naturally An Equal OpportunitylARrmabve Action Employer— 50% Recycled/10%Post Consumer Paper W �lZ State of North Carolina Department of Environment, Health and Natural Resources A14A � • Washington Regional Office " James B. Hunt, Jr., Governor ® C e "� Jonathan B. Howes, Secretary IC f� DIVISION OF WATER QUALITY May 12, 1997 Graveyard of the Atlantic Museum Attn: Mr. Joseph K. Schwarzer P.O. Box 191 Hatteras, NC 27943 Subject: Permit No. SW7970407 Graveyard of the Atlantic Museum High Density.Stormwater Project Dare County Dear Mr. Schwarzer: The Washington Regional Office received the completed Stormwater Application for the subject project on April 1, 1997. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW7970407 dated May 12, 1997 to The Graveyard of the Atlantic Museum. This permit shall be effective from the date of issuance until May 12, 2007 and shall be subject to the conditions and limitations as specified therein. Please .pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30).days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of.the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. 943 Washington Square Mall, Washington, North Carolina 27889 Telephone 919-946-6481 FAX 919-975-3716 An Equal Opportunity Afrtnative Action Employer The Graveyard of the Atlantic Museum May 12, 1997 Page Two If you have any questions, or need additional information concerning this matter, please contact Bill Moore at (919) 946- 6481, extension 264. Sincerely, Roge K. Thorpe Water Quality Supervisor Washington Regional Office cc: Quible & Associates Dare County Inspections John Parker, DCM - Raleigh , ashington Regional Office Central Files State Stormwater Management Systems Permit No. SW7970407 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT, HEALTH 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 The Graveyard of the Atlantic Museum Dare County FOR THE construction, operation and maintenance of stormwater management systems 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 for infiltration basins to serve the Graveyard of the Atlantic Museum located at Hatteras, NC. This permit shall be effective from the date of issuance until May 12, 2007 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 on page 4 of this permit, the Project Data Sheet. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 3 Project Name: Permit Number: Location: Applicant: Mailing Address: DIVISION OF WATER QUALITY PROJECT DATA Application Date: Water Body Receiving Stormwater Runoff: Classification of Water Body: Pond/Basin Depth: The Graveyard of the Atlantic Museum SW7970407 Dare.County Graveyard of the Atlantic Museum P.O. Box 191 Hatteras, NC 27943 04/01/97 Pamlico Sound SA there are 10 infiltration areas, all at elevation 4.5 feet Total Site Area: 7.0 acres Total Impervious Surfaces Allowed: 2.3 acres R d equire Storage Volume:. 12,689 cubic feet (based on 1.5 inches) Provided Storage Volume: 68,501 cubic feet Controlling Orifice: (includes all 10 basins) basin overflow elevation 7.0 feet 4 4. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the _permit and receiving approval from the Division. 5. The following items will require a modification to the permit: a. Any revision to the approved plans, regardless of size b. Project name change C. Transfer of ownership d. Redesign or addition to the approved amount of built -upon area e. Further subdivision of the.project area. In addition, the Director may determine that otherrevisions to the project should require a modification to the permit. 6. 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 been made. certification in writing to the Director that the changes have II. SCHEDULE OF COMPLIANCE 1. The permittee will comply with the following schedule for construction and maintenance of the stormwater management system. a. 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 surfaces except roads. b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 2. The facilities must be properly maintained and operated at all times. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency including, but not limited to: .7 a. Semiannual scheduled inspections (every 6 months) b. Sediment removal C. Mowing and revegetation of side slopes d. Immediate repair of eroded areas e. Maintenance of side slopes in accordance with approved plans and specifications f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping. 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 wereitaken. 5. 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 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. Mail the Certification to the Washington Regional Office, 943 Washington Square Mall, Washington, North Carolina, 27889, attention Division of Water Quality. 7. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of five years from the date of the completion of construction. III. GENERAL CONDITIONS 1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Water Quality accompanied by an application fee, documentation from the.parties involved, and other supporting materials as may be _appropriate. The ed on its merits and approval of this request will be consider may or may not be approved. 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 143-215.6(a) to 143-215.6(c). 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) which have jurisdiction. 6 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 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. Permit issued this the 12 th day of May, 1997. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Preston Howard, Jr., P.E., Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW7970407 VI , as a duly registered Professional Engineer in the State of North Carolina., having been authorized to observe (periodically/weekly/full time) the construction of the project, for The Graveyard of the Atlantic Museum Dare County Stormwater Permit No. SW7970407 Designer's Certification I, (Project) (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. Signature Registration Number Date 0 eD WASHINGTpN OFFICE GRAVEYARD OF THE ATLANTIC MUSEUM APR p 1 1g97 STORMWATER NARRATIVE March 27, 1997 D. E M. A. Drainage from impervious surfaces will sheet flow to vertical curbing where it will be conveyed to dry infiltration basins by concrete flumes with NCDOT Class A erosion control stone installed as shown on plans to eliminate washout around flumes. 24" A.D.S. drainage pipe will be used to equalize and distribute stormwaler among basins. B. There are 3 drainage areas on this project. Drainage Area # 1 is the main parking lot and associated walks - Stormwaler is retained by Basins A, B, BZ C, CZ, D and E and 754 L.F. of 24" A.D.S. pipe. a. Impervious surfaces draining to Drainage Area # 1: g I% - Concrete walks = 1,737 sq.ft. Asphalt & Curbing = 67,037 sq.ft. 12s Total impervious coverage Drainage Area 41 = 68,774 sq.ft Y�o433' 7;: 597�f. b. Volume retained in Drainage Area # I from impervious surfaces: 8� * 48,241 cull. - 68,774 sq.ft. = 0.70 feet or 8.4 inches SA water required to retain first 1-%' ** We are retaining 5.61 times what is required for Drainage Area # 1 2. Drainage Area 92 consists of the remaining asphalt (access loop for loading area), the loading dock, adjacent concrete walk and the future theater expansion area and concrete pad adjacent to the loading dock. a. Impervious surfaces draining to Drainage Area #2: Asphalt r C„rb,49 = 4,692 sq.ft. Concrete = 800 sq.ft. Future Theater Area = 1,050 sq.ft. f, Total impervious coverage Drainage Area 42 = 6,542 sq.ft. X , I zr = 81 e b. Volume retained in Drainage Area 42: * 3,568 cu. . = 6,542 sq.ft. = 0.545 ' or 6.55 inches * * We are retaining 4.36 times what is required for Drainage Area #2 3. Drainage Area #3 is the museum building , concrete deck in front of the building and the future expansion area at the west end of the museum building. a. Impervious surfaces draining to Drainage Area 43: Museum Building = 18,768 sq.ft. Concrete Deck = 3,820 sq.ft. Total impervious F ol7¢ C. coverage Drainage Area #3 = 26,188 sq.ft. X • �t5 - 32ure Museum Expansion = 3,600 sq.ft. b. Volume retained in Drainage Area 93: * (16,69� 26,188 sq.ft. = 0.637 feet or 7.65 inches * * We arc retaining 5.1 times what is required for Drainage Area #3 Stvv Yovi t-5-46Y. — k-e - Ss9� ¢e z4i 4s�z1I 818 3 r4 e # 3 I 3274 /6 z G 87 H N i5 94TM4 PAW &WOCf a a 1 SAND RM........ P �O 4 `� ��z z<� Area 1 Ak f ufw D rZ\n�oJ� SIf area 3 --�� • - —. 1 �1 ` _ fpI[ : SA -WE �y� ;� M ti t a� is 1• 11 ttlL•a .N' Jor.��... ' 1 f rJi'�.�'' ; • 1 Fy re, a) �ZtV � t b Lidt`.L6 fir• 1l'e.� . tlfA �jON C IFAytYARD O-r THE ATLA�471 Mo5Eun1 199� FnIAL D�IIO TIPtylv4A-rEa CALCtsLgTiorJ� II' sea5.0,.a l g1n Ware. A53� � aU�o Uoi�S � Soil +or �or3 e. c1�aJ� I W.T. I! C, n 2trc2c Cu..�uke t S 1q AU�oca� a I �, • A--- 1 �y40Soo-,i,, 0.5�+ 11! v i �e � R- ,;n it '3 A 14H3 rig- o a4s ,`-4S' X � �azySA•-�y �t2 4.5, o.Z -y O =- OOl,r-t� �5-4,$ KO,Z = �� T+� !Z %. Base A 'A �j tnci I z �r i i z Ali � J $• . �bl,� e. �� SJ \k45l t��o�e S.N.wj. - - Jam_ z 'akM f4 3 i I .L r f}� S it �i i III I, , M x Q. SPt 100 kA \/j at w zo - �- II C-1 a � a -, -A &� VtI _ i l(o P-tAxis.s` S+O nO?� i'� V e, Ip r 'S�o rkaP . VA �%a+drtge �ra nt�e Area 1 q 8� �f-1 3 y 645 �'redal S+arage - 2 F=f: r s e �i 11 I � F.4 ri it `t III .I I ph 1 0'1 z+3 bI1 1� -i vlsR� III P93oc.3 {�a�e 7:� .. I!I ' �.-►-= ' Ilj r.o{+i = 233 �t3 a Ll�� V6lutre ?- vs,� G = 16 An;t3i z�a 7)wn�o -Z, 04, .�� v� ---- -f;�Q1 hE� 1-- jl ` III — ail - — --- --- _._._... ----- -- - ------ - _ . -- - ��� 4-- bhc/� Quible Quible & Associates, P.C. ENGINEERS • ENVIRONMENTALISTS • PLANNERS SINCE 1959 March 27, 1997 WASH NGTONEOFFICE OR 0 1 1997 D. E. M. Mr. Bill Moore NCDEH&NR Department of Environmental management Division of Water Quality 943 Washington Square Mall Washington, NC 27889 Re: The Gravcyard of the Atlantic Museum Stomiwalcr Management Plan Dear Mr. Moore: PO. Drawer B70 MY Hawk, NC 27949 Phone: 919-261-3300 Fax: 919-261-1260 F. Richard Quible, P.E.. R.L.S. N.W. &II Gill e . III. P E. Joseph S. Lassiter. C.E.P. Sean C. BoNe. P.E. On behalf of The Graveyard of the Atlantic Museum Committee, 1 would like to submit an application package for the Stormwater Management Plan for the above referenced project. Included within the application package are the following for your review and approval: 1. , One (1) copy of DEM Stormwater Management Plan Application 2. Two (2) copies of the grading and stormwaler plan. 3. One (1) copy of letter from Joe Lassiter of Quible and Associates, P.C. dated March 26, 1997 which details the elevation of the seasonal high water table of the project area. 4. One (1) copy of Stormwater Management Plan calculations dated 3/26/97. 5. One (1) copy of Stormwater Management Plan narrative and calculations dated March 27, 1997. 6. Application & Review Fee check for $385.00. If you have any questions or comments please contact Joe Lassiter or myself at (919) 261-3300. Thank you for your time and attention. Sincerely, Quible and Associates, P.C. U 7t �. cst;;c- Victor E. While cc: Joseph Schwarzer ti I. II. DIVISION OF ENVIRONMENTAL MANAGEMENT. NORTH CAROLINA STORMWATER MANAGEMENT PERMIT APPLICATION GENERAL 1. Project Name: _ Graveyard of the Atlantic Museum REVED WASH NGTO(N'OFFlg APR 0 1 1997 D. E. M. 2. Project Location: (County, State Road, Address) Dare County, Hatteras Township, just west of NCDOT Ferry Docks, Hatteras village 3. Owner Ia Name: Graveyard of the Atlantic Museum Phone:(919) 986-2995 4. Mailing Address: PO Box 191 �as�� K. ScAy ter , City Hatteras State NC Zip 27943 5. Application Date: March 21, 1997 Fee Submitted: $ 385.00 7. Nearest Receiving Stream: Pamlico Sound Class: SA S. Project Description: Construction of museum building, associated parking and walks, stormwater infiltration basins & wastewater treatment system. PERMIT INFORMATION / n ^7 1. Permit No. (will be completed by DEM) : 7 �7 7 �%`�a / 2. Permit Type: X New Renewal 3 4 Modification (existing permit no.) Project Type: Low Density x Infiltration Other State/Federal Permits/Approvals Required: (Check appropriate blanks) $S S-) Detention Other X Sediment/Erosion Control CAMA Major 404 Permit III. PROJECT BUILT UPON Drainage Drainage Basin Basin Breakdown of Impervious Areas Classification SA -Buildings 23018- sq.ft. Prop.&future Allowable Impervious 60n Z510 Access RoadsC/ 70,703. sq.ft. Total Project Area 304�920 sq.ft'. (7.0 Acres) X}iiY-K1{ ,7,385 sq.ft. Concrete a3_cs Proposed Impervious 101,504 sq.ft. (2.3 Acres) Other N/A 8 Impervious Area 33.38 Totals 101',504 sq.ft. IV. STORNWATER*TREATMENT (Describe how runoff will be treated): Stormwater from parking & walks will sheet flow into adjacent dry infiltration basins. S tormwater rom buiiaing 7111 sneer ow dry infiltration basins. See attached stormwater management plan narrative for a more detailed breakdown of stormwater treatment. V. DEED RESTRICTIONS AND PROTECTIVE COVENANTS Deed restrictions and protective covenants are required for all low density projects and All subdivisions prior to the sale of any lot. Please see Attachment A for specific requirements. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the items required by the permit, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the covenant cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. OWNER'S CERTIFICATION I certify that the (Please print name clearly) information included on this permit application form is correct, that the project will be constructed in conformance with the approved plans, that the deed restrictions will be recorded with all required permit conditions, and that to the best of my knowledge, the proposed project complies with the requirements of 15A NCAC 2H.1000. I authorize the below named person or firm to submit stormwater plans on my behalf. AUTHORIZED AGENT Person or Firm Name: Quible and Associates, P.C. Hailing Address: PO Drawer 870 City Kitty Hawk Phone: (919) 261-3300 State NC Zip 27949 Please submit application, fee and plans to appropriate Regional Office. (see attached map) -2- OPERATION AND MAINTENANCE MANUAL I. GENERAL 1. Facility: Graveyard of the Atlantic Museum 2. Owner: Graveyard of the Atlantic Museum Committee PO Box 191 Hatteras, NC 27943 (919) 986-2995 3. Engineering Plans: Plans entitled "Construction Plans for The Graveyard of the Atlantic Museum", Sheet C3 dated 3/24/97, prepared by Quiblc and Associates, P.C. and approved by the North Carolina Division of Environmental Health & Natural Resources, Water Quality Section. It. OPERATION AND MAINTENANCE REQUIREMENTS: Dry detention ponds have moderate to high maintenance requirements, depending on the extent to which future maintenance needs are anticipated during the design stage. The owners, listed above, shall be responsible for both routine and non -routine maintenance tasks. If regular maintenance and inspections are not undertaken, the pond will not achieve its intended purpose. The basic elements of a dry extended detention pond maintenance program arc described below. Routine Maintenance lu'I1zVKCV7 The side -slopes, embankment and vegetative filter of a dry detention pond must be mowed at least once a month to discourage woody growth and control weeds. More frequent mowing may be required during the high growing season. The use of native or introduced grasses which are water -tolerant, hardy and slow - growing are rcconunended. See attached seeding schedule for representative species and fertilization rates. INSPECTION Ponds should be inspected on an annual basis to ensure that the structure operates in a manner originally intended. When possible, inspections should be conducted during wet weather to determine if the pond is meeting (lie targeted detention times. In particular, the overflow structure should be regularly inspected for evidence of clogging, or short circuiting. Other problems which should be checked for include: subsidence, erosion, cracking or tree growth on the embankment; erosion around the inlet and outlet structures; the adequacy of downstream vegetative filler; erosion of the pond's bed and banks; erosion of the downstream vegetative filler; and modifications to the pond or its contributing watershed that may influence pond performance. DEBRIS AND LITTER REMOVAL Debris and litter that accumulate near the inlet and outlet structures should be removed during regular mowing operations. The pond side -slopes, and embankment all may periodically suffer from slumping and erosion, although this should not occur often if the soils arc properly compacted during construction. Regrading and revegetalion may be required to correct the problems. Similarly, the riprap on the inlet and outlet structures may periodically need to be repaired. NUISANCE CONTROL Standing water or soggy conditions within the dry detention pond can create nuisance conditions for nearby residents. Odors, mosquitos, weeds and litter arc all occasionally perceived to be problems in dry ponds. Most of these problems arc generally a sign that regular inspections and maintenance are not being performed (e.g., mowing, debris removal, clearing the overflow structure. Non- Routine Maintenance STRUCTURAL REPAIRS AND REPLACEMENT Any structural damage in the inlet or outlet structures shall be made as soon as possible. SEDIMENT REMOVAL When properly designed, dry detention ponds will accumulate significant quantities of sediment over time. Sediment accumulation is a serious maintenance concern in dry detention ponds for several reasons. First, the sediment gradually reduces available stormwater management storage capacity within the pond. The best available estimate is that approximately 1% of the storage volume capacity associated with the two year design storm can be lost amorally. Thus, as much as 20% of a pond's total storage capacity can be lost within 20 years. Even more storage capacity can be lost if the pond receives large sediment input during the construction phase. Second, sediment accumulation can make dry extended detention ponds very unsightly. Third, and perhaps most importantly, sediment tends to accumulate around the control device of dry detention ponds. Sediment deposition gradually reduces storage capacity reserved for pollutant removal in the pond. For these reasons, accumulated sediment may need to be removed from the lower stage every 5 to 10 years in a dry detention pond. More frequent spot clean -outs may be needed. Sediment removal operations arc relatively simple if access for heavy equipment is provided. Front-end loaders or backhoes can be used to scrape off the bulk of the accumulated sediment, followed by manual removal of sediment deposited around the inlet and outlet structures. The disturbed area should be immediately stabilized with vegetation after removal operations are completed. AGREEMENT TO SATISFY OPERATION AND.MAINTENANCE REQUIREMENTS I, of , agree to maintain the dry retention pond as outlined in this manual. Signed Date Quible Quible & Associates, P.C. ENGINEERS • ENVIRONMENTALISTS • PLANNERS SINCE 1959 March 26, 1997 Mr. Bill Moore NC Division of Water Quality 943 Washington Square Mall Washington, NC 27889 RECEIVED WASH INGTON OFFTt APR 0 1 1997 D.EM. Re: Graveyard of the Atlantic Museum - Stormwater Management Plan Dear Mr. Moore: P.O. Drawer 870 Kitty Hawk. NC 27949 Phone: 919-261-3300 Fax: 919-261-1260 F. Richard Ouible. P.E.. R.LS. H.W. Bill Gilbeit, III, P.E. Joseph S. Las9tw,, C.E.P. Soon C. Boyle, P.E. I have been requested by our staff engineers to provide an assessment of the seasonal high water table at the 7 acre parcel of land designated by the National Park Service for construction of the Graveyard of the Atlantic Museum. The initial environmental assessment that our firm conducted on the property included delineation of the Section 404 wetlands. During that process I hand augured numerous soil borings on the site for the purpose of establishing water table. My findings indicate that the average existing elevations on the site range from +/- 7.5' to 4.5' with an average of approximately 5.5' and that the seasonal high water table in the area proposed for development is at an elevation of approximately 2.5'. Thank you for your attention to this information. If you have questions please contact me at 919- 261-3300. Sincerely, Quibl nd Associates, P.C. J seph S. Lassiter, CEP cc: Victor White