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Home My WebLink About20070323 Ver 1_More Info Received_2007051047.0323 THE JOHN R. McADAMS COMPANY, INC. LETTER OF TRANSMITTAL To: Ms. Cyndi Karol NCDWQ 2321 Crabtree Blvd -Suite 250 Raleigh, North Carolina 27604 919-733-9721 Re: Falls Village Golf Course Job No. DWQ Project #-07-0323 Date: May 9, 2007 I am sending you the following item(s): "" FEDERAL EXPRESS "` FVD-06000 COPIES DATE NO. DESCRIPTION 5 Res onse to comments letter dated Ma 9, 2007 5 Exhibits These are transmitted as checked below: ^ As requested ~ For approval ^ For review and comment ^ For your use ~~ 1' ~~~ M~',Y 1 €; Z H ^ ~ ~ l^"fly? ~,,~',Tn'~a~,,~A; Fa ~3pAt~tGH Remarks: i ~" - Copy to: ~ Signed: FOR INTERNAL USE ONLY ^ Copy Letter of Transmittal Only to File ® Copy Entire Document to File Group F CIVIL ENGINEERING LAND PLANNING SURVEYING PO Box 14005 Research Triangle Park, NC 27709 (919) 361-5000 • fax (919) 361-2269 www.joh nrmcadams.com Since 1979 Research Triangle Park, NC Post Office Box 14005 Research Triangle Park, North Carolina 27709 2905 Meridian Parkway Durham, North Carolina 27713 800-733-5646 919-361-5000 919-361-2269 Fax Charlotte, NC 5311 Seventy-Seven Center Drive, Suite 66 Charlotte, North Carolina 28217 800-733-5646 704-527-0800 704-527-2003 Fax THE JOHN R. McADAMS COMPANY, INC. 07.0323 May 9, 2007 Ms. Cyndi Karoly North Carolina Division of Water Quality 401 Oversight/Express Review Permitting 2321 Crabtree Boulevard, Suite 250 Raleigh, North Carolina 27604 Re: Falls Village Response to Comments dated April 11, 2007 FVD-06000 Dear Ms. Karoly: ~~,- ~4N~YEzhkt~li~tlilrK ~~+tia:~tt~xt Below please find our comments regarding your request for information for the 401 permit on the above referenced project. Comment 1: Please provide documentation that DWQ or Forest Resources has made intermittent/perennial stream determinations on the site or contact DWQ to schedule intermittent/perennial stream determinations on the site. Response 1: Supplied in original application of March 28, 2007. Satisfied in telephone conversation with Ian McMillan on April 24, 2007. Comment 2: Please specify the percent of project imperviousness area based on estimated built-out conditions and provide an inventory of all impervious surfaces (building footprints, roads, driveways, decks, sidewalks, gravel-covered areas, etc.). Be sure to not include the golf course in your calculations. Please call Ms. Annette Lucas at 919-715-3425 if you have questions. Response 2: Supplied in original application of March 28, 2007. Satisfied in telephone conversation with Ian McMillan on April 29, 2007. Comment 3: Please show all impacts for the entire site on one full plan sheet. Response 3: Supplied in original application of March 28, 2007. Comment satisfied in telephone conversation with Ian McMillan on April 2Q, 2007 Comment 4: Please indicate which 404 permit the USACE would use to authorize this project. Response 4: We will qualify to use the new USACE NWP 29 for Residential Subdivisions, which previously covered under Comprehensive Land Development Design Services www.johnrmcadams.com We help our clients succeed. Since 1979 THE JOHN R. McADAMS COMPANY, INC. Ms. Cyndi Karoly May 9, 2007 FVD-06000 Page 2 NWP 39. Comment satisfied in telephone conversation with Ian McMillan on Apri124, 2007. Comment 5: Buffer impacts will need to be quantified in square feet in the table located in Section X of your PCN application. Response S: 2,178 square feet of zone 1 impacts; 1, 742 square feet of zone 2 impacts. Revise in PCN. Comment 6: All seven of the proposed scour holes have been placed in locations where slopes are too steep. In order to install a scour hole, the slopes must be less than 2 percent and the outlet pipe must be less than or equal to 18 inches in diameter. Please refer to the Level Spreader BMP Manual Chapter on the DWQ web site for more information about the appropriate design of level spreaders: http://h2o.enr. state.nc.us/ncwetlands/documents/LevelspreaderB MPMamialchanter. doc. Response 6: The slopes adjacent to the scour holes will be re-graded to meet the 2% slope requirement and will utilize a drainage pipe of 18" or less. Attached you will see the scour-hole exhibits, that depicts where the slopes are equal to or less than 2% adjacent to the scour-hole, and will utilize a drainage pipe of 18" or less. This same design will be utilized with all other pre formed scour holes in order to come in to compliance (Revised Scour- Hole exhibits are attached). Comment 7: Because of the inappropriate slopes, all seven of the proposed scour holes must be replaced with level spreaders designed according the specifications given in the Level Spreader BMP Manual Chapter. The resubmittal must include plan details for all components of the level spreaders and dated, labeled photographs that show the vegetative conditions in the filter strip for each level spreader. In addition, the resubmittal must include a DWQ level spreader worksheet for each of the level spreaders, available at: http://h2o.enr. state.nc.us/ncwetlands/documents/Levelspreader Worksheet 2007designguidance l.doc. Since 1979 THE JOHN R. McADAMS COMPANY, INC. Ms. Cyndi Karoly May 9, 2007 FVD-06000 Page 3 Response 7: See response to comment 6. Comment 8: The level spreaders that replace scour holes 3, 4, 6 and 7 must be moved downslope from the currently proposed locations of the scour holes. Whenever possible, level spreaders should be located just outside the riparian buffer to prevent diffuse flow from reconcentrating before it enters the stream. Response 7: See response to comment 6. Comment 9: stormwater pond outfall #8 must be redesigned in order to meet the requirements of the Neuse Buffer Rule. This rule states that new stormwater conveyances are not allowed through the buffer unless "a stormwater management facility is installed to control nitrogen and attenuate flow before the conveyance discharges through the riparian buffer." As currently designed, the design of this outfall will likely result in an eroded channel through the riparian buffer. There are two options to bring outfall #8 into compliance with the Neuse Rule: a. Install a properly designed level spreader to diffuse the flow from stormwater pond #2 through the riparian buffer. b. Submit design calculations, plans and a worksheet for stormwater pond #2 so that DWQ staff can determine whether it has been designed according to DWQ BMP Manual standards. Then, provide an engineered conveyance (a pipe or properly designed Swale) to convey the outflow from stormwater pond #2 directly to the stream channel. Response 9: stormwater pond # 2 is located within an existing isolated pond man-made pond within a natural draw with an existing outfall. The utilization of this pond will not permanently increase the normal pool of the pond, and the outfall is now located within an existing ephemeral drainage/draw to the downstream, stream start point. We are improving the outlet structure at this location and decreasing the current flow velocities at this location, therefore we do not believe a level spreader should be required at this location, nor a pond design submittal. Since 1979 THE JOHN R. McADAMS COMPANY, INC. Ms. Cyndi Karoly May 9, 2007 FVD-06000 Page 4 Consideration of this response is greatly appreciated. If you should have any questions or require additional information, please do not hesitate to contact me at (919) 361-5000. Sincerely, THE JOHN R. MCADAMS COMPANY, INC. J. Kevin Yates Senior Environmental/Wetland Scientist Stormwater and Environmental Department Enclosures cc: Laurie Dennison It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to required state and local buffers associated with the project. The applicant must also provide justification for these impacts in Section VII above. All proposed impacts must be listed herein, and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ Regional Office may be included as appropriate. Photographs may also be included at the applicant's discretion. 1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233 (Neuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC 2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please identify)? Yes ® No ^ 2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer mitigation is required calculate the required amount of mitigation by applying the buffer multipliers. Zone* Impact Multiplier Required (acresl Mitieation ~ 1 ~ 0.05 (2,178 sq. ft.) ~ 3 (2 for Catawba) ~ ~ ~ 2 ~ 0.04 (1,742 sg. ft> ~ l.s Total 0.09 * Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an additiona120 feet from the edge of Zone 1. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation of Property, Riparian Buffer Restoration /Enhancement, or Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as identified within 15A NCAC 2B .0242 or .0244, or .0260. Compensatory mitigation is not proposed at this time; however, if compensatory miti>ation is reauired. the applicant nroiJOSes to make an in-lieu payment to the North Carolina Ecosystem Enhancement Program. XI. Stormwater (required by DWQ) Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stormwater controls proposed in order to protect surface waters and wetlands downstream from the property. If percent impervious surface exceeds 20%, please provide calculations demonstrating total proposed impervious level. Proposed impervious surface is 57.71-acres or 13.23%, additional details will be provided in DWQ stormwater permit application XII. Sewage Disposal (required by DWQ) Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from the proposed project, or available capacity of the subject facility. To minimize run-off, detention of Stormwater is proposed at two existing ponds located on the property. In addition, proper sedimentation and erosion control measures will be implemented Updated 11/1/2005 Page 12 of 13 -, ~~ I I ~ 1 1 / I I ~ ~ ~ I i ) ~ ~ - -~ ( J I I ~~ ~ / I ~ ~ ~ I ~ ~ l I I ~ / ~ ~ I I ~ / ~ / / ~ I ~ ~ ~ ~ I ~~ .___ _ ~ ~ ~'~ _ ~ J I /319.10 ~ ~ I I ~( I \ \ ` I ~ - - / I ~ l~ / 31890 / PROPO~E~ SANITARY J I / ~ SEWER ;MANHOLE ~'` - - - W ~ ~ ;l FLARED END SECTION WITH 19.30 N PREFORMED SCOUR HOLE #1 / ~ -P ~ `~ . - - 319.0 ~ I ` I _ ~ \ ~', \ \ ~; hROPOSE~ \ SANITARY EWER ~ ~ ~ ~ ~ I ~ ~ ~ - ~ ~ --~ -~ ~ \ \ PROPOSF,p~TSRM / ) / _ -BRAIRTGE _ - - ~ ~ \ ~ i ~ ~ i / \ \ ~ ~ ~ ~ ~ ~ ~ ~- -~- -_- 1- ~\ / _~ \ ~ ~- ~ 1 OF 7 PROTECT NO. FVD-OS000 FALLS VILLAGE THE JOHN R. McADAMS ~ ~'~E° Fwosooo-Ei COMPANY, INC. a d ~~~= " ' DWQ SCOUR HOLE EXHIBIT >ia~cn~xs/P1wx-~e~s/suxvsroas y 1 = 20 BesrrxcH TIO~IiGI,g PAx1c. NC ~ DURHAM, NORTH GAROLtNA P.o. Box laoos z>p z~~oa-4oos ~ DATE' Qrj-Q2-Q7 (919) 981-5000 \ ~ ~ ~ I ~ `1 ~ ~ r .~ \ ~ i ~ \ ~- _ ~ \ \I \ ~ ~ ~ 1 ~~ ~ ~ \ \ -~ \ i ~ ~ , / I \ ~ \ \~ \ I ~ - ~ LL ~ ~ I ~ \ ~ \ ~ \ ~ ~ ~ ~ \ "" LARED END SECTION WITN \ ~. / P~OR#€D COUR HOLE #2 ~ ~ ~ \ \~ ~\ / ~ \ \, ~C" I \\~ , 6.90 \ \ ~- ~ ~ / PROPOSED RM ~~ \ ~ DRAINAGE ~ ~ ~ \ ~ ~ f ~ ~ PROPOSED SANITARY SEWfR ~ ~ \ / \ \ w~/~ ~w~ w \ ,,~- PROPOSED S/~NiTARY _ ~ -~-~.._~- I SEWE~M~ANt~OLE ~' '- \~ \ ~ \ J ~~ ~ ~ , -~ I \ ~ __ 1,\ ~ i ~ Is ,_,,\ ~ ~ ~ ~ _, I \ ~` ` I \ ~ \ \ ~ i ,\ ~ 20F7 PROTECT NO. FVD-06000 FALLS VILLAGE THE JOHN R. McADAMS ~ P~~EnuuE: FVD06000-E1 COMPANY, INC. V ORS 9 d SC~.E: " ' DWQ SCOUR HOLE EXHIBIT ENGDdEERS/PLANNE&9/SUR EY a 1 =20 RESEARCR TRLNGIB PARR. NC ~ DURHAM, NORTH CAROIINA P.o. Box 1400b ZIP P7709-4005 ~ DATE: OS-OZ-O7 (919) 981-5000 .~~ ~ i ~ ~ 1 l ~ ~ ~ ~ ~ ~ 1 ~ / 1 ~ ~ / ~ ~" . ~ ~ / ~~ ~ ~ _ ~ / /~ / ~ /' / / / / ~ ~/ ~~ ~~~ ~, / , ~ / / ~ _~ j / / / / / f // / ~~ /// ~ < ~' i~~ - - ~ yam/ ~i7.so /,~ ~ j / ~ / 327.0 W ` \ \ / 7 i /~ / ~ / w / / // / a ~ / ~ ~ % / FLARED END ~CT10N WITH 32 .70 PREFORMED SCOUR HOLE~3 327. ` , / ~ / \ ~ // / 1 / , ~ ~ / ~ ~ ~ / , ~ / / / / ~ ~( ~ / ~/ ~ PROPOSED STO M ~ ~ / / /DRAINAGE ~ 1 / , / / / / ~ U , // / ~ , ~, i i \ / ~ ~ ~ ~ 1 ~ ~ / , `~ ( ~ ~ i ~i ~ ~ ~ ~ / ~ ~ ~ ~ ~ ~ 30F7 ~ PROJECT NO. FVD-06000 FALLS VILLAGE THE JOHN R. McADAMS INC COMPANY ~"~"""e~ . , ~ FVD06000-E1 >.x~is~~OR~ y ~'"$' ~ ' DWQ SCOUR HOLE EXHIBIT xc ~ =20 n~sirrxcH Txurlcis PARK, N~~H ~O~A DU~'~M P.O. HOI 146 ZIP Y7709-4005 ,~ , ~ DATE: O`"J-OZ-O7 (919) 9e1-5000 - I ~~ ~ ~ \\ ~ ~_- \ ~ ~~ ~ ~ ~ `: ~ ~ ~ ~~ -~ \ i ____ _. ___ ~. - -- ___ __ --- __ .. . __ __- _ ~ ~ .,, ~, ,, _. / / / / I ,l ~ ' ' 340.30 _ FLARED END S~TION WITH /PREFORMED SCOUR HOLE #4 / / 340. / / ~ X0.55 / / / / ~ ~ i ~ ,~ . ~~' ~ ~ ~ ~^ ~ ~~ i ~~ i ~ , ~ ~ ~ 40F7 ~~ _ / ~/ ~' . -~ PROFSOSED STORM , D AINAGE ~ ~ / / /__ -__ / >/ ~ / / ~~ ~ ~ / ~ ~ ~ ~ / I ' ~ / 1 ~ / ~ / / I / ~ i/ ,/ ~ / / PROJECT NO. FVD-06000 FALLS VILLAGE THE JOHN R. McADAMS ~ ~"E"""E~ FVDO60oo-E1 COMPANY, INC. 9 e s~~: " ' DWQ SCOUR HOLE EXHIBIT SNGINEERS/PIANNSR9/SURVEYORS a 1 =20 REBEeRCa rR1ANG18 P~Rx, NC ~^ D, N~~'~ ~R~~A P.O. HOX 14006 ZH' E770Y-4005 ~ DATE: OS-O2-O7 (919) 961-b000 ~ - ~_ ~ ~ - - 1 1 ~ ~ I I / ~ i I I_-/ / I___~~ / ~ i i/ _ ~ -, ND SECTION WITH ~ / ~ ~D SCOUR HOt~C~#5 / ,o~~ ~ / ~ / / / ..35 / I / -- ---- / - / ~ 340 / ~ / ~ ~-- / /~ ~ ~ / / /i ~ / i - -l ~ / ~ . / ~ ~ / ~ ~ ~ . l ~~ i ~ i ~ ~ \ ~~ / ~ ~ ~ ~ ~ ~~ ~ / ~ 50F7 PROTECT NO. -FVD-OF)OOO FALLS VILLAGE THE JOHN R. McADAMS ~ PIIENA1tE: FVD06000-E1 COMPANY, INC. a ~~ ~ • DWG SCOUR HOLE EXHIBIT ENC~NEERS/PUNxERS/svRVE~roRs r~ , =20 D V iii l[11~A. NORI~I CAROLINA RESEARCH TRi1NOLE PARK, NC P.O. BOR 14006 ZQ' 27700-005 ~ DATE: 05-02-07 (916) 981-5000 `/ ~ l ~\ ~ 3 i~~ ,`' ~ ~ ' ~~ ~ i J /, ~ i /i / i ~ `~ / ,~ / , ~ , / /~ i ~~' / ~ / ~ ~ i ~ / / \ ~ / ~ / / ~ _ FLARED END SECTION WI~ / 323.45 PREFORMEDh~COI~R HOLE #6 / / ~ / / / / , / / 323.45 / / \ / \ / 60F7 ~ ~ ~\ ~~ YRwecr No. FVD-06000 FALLS VILLAGE THE JOHN R. McADAMS ~ F7IENAYR: FVD06000-E1 COMPANY, INC. Y s~,-~, ~ ~ DWQ SCOUR HOLE EXHIBIT ENGD~ELRS/PI.ANNERS/SUBVEYO$S , =20 DU~~M~ N~~ ~~~~ _ PROS HO~Z 1400b G~ 27~T0~ 4005 ~ DA7~` 05-02-07 (eiv) aai-soon ~ /~ 3 0 / ` ~/ ~~PRQPOSED STORM DRAT GEC ~ ~ ~ ~ ~ \ ` / J _ ~ -~ i ~ ~ ~ / ~ ~ ~ ~~~ s ~ ~~ ~ ~ ~ i ~ ~ / ~ ~ ~ ~ / ~ / PROP09ED STORM DRAINA~E i >~ ~~~ ~i ~ ~ ~~ ~ ~ ~' ~ ' ~ ~ ~ ~ \ ~ \ J 310.70 310.45 \ / / /FLARED END SECTI N WITH ~ _ PREFORMED SCOU~t HOLE #7 I ~ ~ ~ ~ ~ i i ~~ ~ ~ ~ ~ ~ ~ i J ~ 1 / ~ ~ ~ / / ~ ~ ~ / ~~ i / ~ / ,~\ ~\ ~ ~ ~ 70F7 \\ ~~ _-. ® P~a~T "°~ Fvo-osooo T /~ T T r T 7TT T A r ~ j~-~l~ t+ 1~Lj~ V lj THE JOHN R. McADAMS INC COMPANY ~ ~"E""aE= FVD06000-E1 J . , , e ~~~ •• ~ DW SCOUR HOLE EXHIBIT ~ ~'°"''~'"~"~'°'~ 9 ~ =ZO RESSSx~ 77tuNGIB P~Rx. NC ~ B"'~ DLfRHAM, NORTH CAROLINA P.o. sox iaoos am zr~oo-4oos ~ ~ 05-02-07 (si>a) 9ai-soon ~____ ~ \ N 310.70 310.4 /