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Home My WebLink About20041337 Ver 3_More Info Letter_20070913fl~-1337 Y3 Mitchell Environmental P.A. September 13, 2007 Mrs. Cyndi Karoly 401 Oversight and Express Permits Unit 2321 Crabtree Blvd. Suite 250 Raleigh, NC 27604-2260 Re: Harrison Place Subdivision -Request for More Information Fuquay Varina, North Carolina (Wake County- Neuse River Basin) DWQ Project #041337, Version 3 Mrs. Karoly: 'o~ ,. ~~ ~~ N ~S~ ~~ tSo ~QO, This letter is in response to your request for more information for Harrison Place Subdivision dated August 14, 2007. The following restates your requests with a response to each below. 1. Please re-submit your site plans on full plan sheets at a scale of no smaller than 1 "=50'. This permit application is only for the two individual, existing lots illustrated on the previously submitted PCN Application and on the attached BMP design sheets. Impacts for the remainder of the subdivision were previously permitted through separate PCN Applications. Per a telephone conversation with Mr. Ian McMillan, the maps as previously submitted should suffice since this application is only for the two identified lots. These maps are at a scale no larger than 1"=50'. Z. Please indicate the diffuse flow provision measures on the site plan and submit diffuse flow provision measure worksheets and signed and notarized Operations and Maintenance Agreement. Both of these lots discharge stormwater runoff into wide, flat, forested valleys that contain no streams or Neuse Riparian Buffers within several hundred feet of the proposed homes. We have NCDWQ confirmation that no Neuse Riparian Buffer exists downstream of lot 23 for approximately 2,000-feet (Letter & Map are Attached). Additionally, both of these sites are in the upper coastal plain and are covered by coarse grained soils that have a relatively high permeability. It is reasonable to expect that a significant portion of stormwater runoff from the first 1-inch of rainfall will be absorbed by the soils in this area. This expectation is supported by the fact that no streams currently exist in these valleys. The remaining stormwater that is not absorbed into the soil will travel as sheetldiffuse flow, a minimum of several hundred feet through the forested valley detailed above, before entering any stream or Neuse Riparian Buffer. For these reasons, we believe it is unreasonable to require additional diffuse flow measures on these properties. PO Box 341 Fuquay-Varina, North Carolina 27526 D~ce:919-557-4682 Fax: 919-557-4683 Mobile:919-669-0329 In the event that you maintain your requirement for diffuse flow measures, I have attached proposed BMP designs for each lot. The attached basin designs will capture the runoff from the first inch of rainfall and release it through an underdrain that will promote percolation into the soil while reducing the instantaneous flowrate from this I- inch rainfall event. No BMP worksheets or Operations and Maintenance Agreements are attached because we hope that upon your review of the supporting information, you will agree that diffuse flow measures are not warranted on these lots. Thank you for your time spent reviewing these responses. Do not hesitate to call me if you have any questions or concerns about this project or if you need any additional information to process this application. Sincerely, Scott Mitchell, PE, LSS O~O~ W A T~9QG f ~_ ~ ~ ~ July 13, 2007 Mr. Douglas Ball 1401 Aversboro Road, Suite 206 Garner, NC 27529 Subject Property: Fred Holleman Tract Coleen H. Sullins, Director Division of Water Quality DWQ EXP# 07-1189 Wake County On-Site Determination for Applicability to the Neuse Riparian Area Protection Rules (15A NCAC 2B .0233}EXPRESS REVIEW PROGRAM On July 13, 2007, at the request of Mr. Scott Mitchell of Mitchell Environmental, P.A., an on-site determination was conducted to review five stream features located on the subject property for applicability to the Neuse Buffer Rules (15A NCAC 2B .0233). The features are labeled as "A" through "E" on the attached map, initialed by Lia Myott on July 13, 2007. The Division of Water Quality (DWQ) has determined that the following: • Feature "A" is subject to the Neuse Buffer Rule on the property at the flag labeled by DWQ as "A 1 ". Feature A is an intermittent stream. • Feature "B" is subject to the Neuse Bu„tfer Rule from the flag labeled "B 1" to the flag labeled "B2" (isolated stream). At the DWQ flag labeled "B3", the feature again becomes an intermittent stream and is therefore subject to the Neuse Buffer Rule. • Feature "C" is subject to the Neuse Buffer Rule on the property at the flag labeled "C 1 ". The stream was determined to be intermittent at "C 1 ". • Feature "D" is subject to the Neuse Buffer Rule on the property from the flag labeled "D6" to "D7" and from flag "D8" to "D9" (isolated intermittent streams). Downstream from flag "D6" the feature becomes a wetland and is therefore not subject to the Neuse Buffer Rule. • Feature "E" is a wetland with no stream features and is therefore not subject to the Neuse Buffer Rule. This on-site determination shall expire five (5) years from the date of this letter. This letter only addresses the intermittent/perennial status of the stream features listed above according to current DWQ standards and does not approve any activity within the streams or address features that were not observed during the site visit. Nor does this letter approve any activity within Waters of the~nited States or Waters of the State. If you have any questions, please contact Lia Myott at 919.733.9502. Since, ly, P Coleen H. Sullins, Director NC Division of Water Quality CHSlcbk/lem Attachments: NRCS Soil Survey Map, USGS Topo Quad Map 401 Oversight /Express Review Permitting Unit 1650 Mail Service Center, Raleigh, North Carolina 27699-1b50 2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604 Phone: 919-733-178b /FAX 919-733-6893 ! Internet: htto:!/h2o.enr.state.nc.us/newetlands Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Depardnent of Environment and Natural Resources NO"` Car• 'na ~~~ An Equal Opportunity/A~rmative Action Employer - 50% Recycled/10~o Post Consumer Paper ' Fred Holleman Tract Page 2 of 2 July 13, 2007 cc: Scott Mitchell, Mitchell Environmental P.A., 602 East Academy Street, Suite 105, Fuquay-Varina, NC 27526 DWQ Raleigh Regional Office File Copy Central Files .. Fuquay-Varinta ~ ~.,~ ~ ~ .~--_-~~~•- . ~4 _ .~ ., _ ., Flag t,pt 23 °~ +, -~' ~ ~.J .. ~ ~ ~ .: ~ .. -- t 1 6 ~ , ~ •-.. .. ~ .--. • ~, S ..~- ~i~` ~ F ,~-- ~ ~•~~~~ _ ~ yx~cesa! ~~f ~ '. ~~~j// t t ~ ~ d -____~ -•_y, `` ~` e N ~ .. ^ i... + f ~ t. I': j '~ •.i ~., - . _~! ! .ter'` !~, 1 ' ~ ~ t-}: ~ ~ ~ . , FOt ~~- ~ ,. .. _. .. Fond . ' ~ za z a ' •. e~ e l _ ~ ... . • , ! ! 395. ' ! ~ .. .„ `, ., • ~ ''. A - .. . ~ ~• i . I . ,~ c M ~ -~ j~ ~ ~ - -r' ~ Sip *~~ - j ~ ~ ' ^- T ~ ~ rf + . } ~ ,. ~ a~;~a 3, Cem ' ~ 1 ~ = _ ~. ,. - f F -+..-'-Vii'-~--------i p(ltipQ~ ~j~ ~n~Q ! ter- ~ ~ ~ •4,4°a.,~ ~qA ! ~ ~, }i~ Y~ ~i L s~~ ~AINQl9l11911i C~.'T;' ;~' ~,~a7 JFrislcnC~'a:>:'~~ ~r~. ~.~~ ~ --- , 3u~a .fit . ~:~~o--r ~~~ ~ DWQ Project #: 04-1337, Version 3 10 Roof Area: 2,827 ft2 Resultant 1" Runoff Volume: 236 ft3 Required BMP Area @ 1' Depth: 236 ft2 Supplied BMP Area @ 1' Depth: 240 ft2 BMP Underdrain: 4" Slotted I-IDPE w/ Sock Recommended BMP Vegetation: Grass Proposed BMP _ 14 - - ~ ---- 12' 17" N O , w WETLANDS - BOUNDARY 1 - I I ~ ~26 --- --- I -----~ ~ I ~ I 1 ~ I ~ ~ 1 r 1 100 YR. FLOOD LINE ~ I I PROPOSED HOUSE ", I 1 W O I O N 10- ~ ~ - I I PROP. 72.7' M ~ C~ L &WAL ~~~ ~ - I Op I . -. Z w p 20' DRAIAIAfaE ?0' EASEMENT ~ ~ I 20' I ~, 9 1 ~ I 20 ---~---- NORTH HARRISON PLACE LANE -- --- ~so~ rueixc niw> All roof drainage shall be collected and diverted to proposed BMP through the use of a standard roof gutter system in combination with a 4-inch PVC piping system. PVC piping system shall be installed underground to the maximum extent practicable, while maintaining adequate fall to the BMP from all gutter downspouts. YITCIIBLL Is'NYIRONAIENTAL. P.A. P.O. BOX 341 > FUQUAY YARINA, NC 27526 OFFICE:919-557-4682 FAX: 9> 9-557-4683 bemeenv{ronmentalOearthlink.aet PREPARED FOR: Progressive Raiders of NC, Inc. 78 1 PurfoY Road, Sufte 215 Fuguay Vame, NC 27526 DAIE:September 13, 2007 SCALE: 1' = 30' ENHRONaENTa saENnsr caNTACr. SCOTT YITCNELL, PE, LSS HARRISON PLACE S/D FU$UAY VARINA, NC - A'AKE COUNTY LOT 9 -BMP DESIGN SHEET > OF 2 Plan View of Proposed BMP 14' 12' Base of 4-Inch Slotted HDPE w/ Sock and Daylight Outlet Install small berm around upslope borders of BMP to prevent additional runoff from entering and overloading the BMP. Line bottom, sides, berms and 2-foot perimeter around entire BMP with sod upon completion of grading, PVC pipe installation and underdrain installation. Cross-Section View of Proposed BMP Earthen Berm (if Required to Achieve 1-Foot BMP Depth) _. __ ___. j j __.._.... _. ___ . _. _ _ _ a ~ 1-Foot ti Existing Ground (Approximate) 4-Inch Slotted HDPE w/ Sock and Daylight Outlet Top of HDPE underdrain shall be installed between 4 and 6-inches below bottom of BMP and covered with clean sand to finished grade. Ensure positive drainage to prevent extended ponding of collected runoff. ~lITCEELL ENVIRONA[ENTAL. P.A. ~ FUQUAY VARINA, NC 27526 OFFICE: 9>8-557-4682 FAX: 919-557-4683 baynennv~dronsnentatOearthl{nk.nst PREPARED FUR: Prooressivs Guiders of NC, Inc. 7621 Purfoy Road. Suite 215 Fuquay Vaina, NC 27526 DATE:September 13, 20071 SCALE: NTS ENV~tONMENTAI. SC~NIIST CONTACT: scoTr ~xTCNEU. PE, LSS HARRIS~IV PLACE S/D FUQUAY VARINA, NC - HAKE COUNTY LOT 9 -BMP DESIGN SHEET 2 OF 2 DWQ Project #: Roof Area: Resultant 1" Runoff Volume: Required BMP Area @ 1' Depth: Supplied BMP Area @ 1' Depth: BMP Underdrain: Recommended BMP Vegetation: N 01°21'40"E 180.78' 100 YR. FLOOD LINE-- `, `` ------- \ ..; ........ .... ~ ~ J -~.. 04-1337, Version 3 2,414 ft2 201 ft3 201 ft2 220 ft2 4" Slotted HDPE w/ Sock Grass ~~ ~~\ 2 3 ~' 20' DRAINAGE EASEMENT / ~ `~~ 100 YR. FLOOD LINE 25 ~ ~ N~ ~ ~ . ~ ~\~ a ~\ ~. .~ ~. rn\ ~• S.\ ~. / iZ /.• ~~ .~ Ito I~ c~ ~. Ica I °~ All roof drainage shall be collected and diverted to proposed BMP through the use of a standard roof gutter system in combination with a 4-inch PVC piping system. PVC piping system shall be installed underground to the maximum extent practicable, while maintaining adequate fall to the BMP from all gutter downspouts. Proposed BMP PROPOSED HOUSE ~~ ~~ J \ .' ~/~/~ 24 & Im I~ IO I~ _~ g~ vg ~o ti 21 PACE ~E ~,- SONS ~e~sc ~Iwl ~0/ ~,,,- / ,, /,, ~. bfITCHELL BNVIRONYENTAL. P.A. ~~ ~' e1 ~°e's°~~ts` HARRIS4N PLACE S/D P.O. BOX S41 fuQuay Mena NC 27526 FUQUAY VARINA, NC zT5z8 FUQUAY MARINA, NC - A'AKE COUNTY DAIESeptember 13, 2007 SCALE: 1" = 50' OFFICE: 919-557-4682 L D T 23 - RMP DESIGN FAx: 919-557-4688 ENNRONAIENra scmtnsr ca+tACr: SHEET 1 OF 2 bamenvartmmenttctOearthlink.»et ~~ ~T~" ~' ~ Plan View of Proposed BMP ao~ 11' Base of BMP -~~ j ,-~ , ~-----, :_ =- -- --~ x1.11=1;j1 1~'j~: ~_.._~ ` 1=-;~! ~ 711== 11=--; :!~~ ~ t .111=~1~ ti~~;i,~..~~~_ `! ~~ ~ i-~ i i~=i 1 ~~`~ 20' 11' 4-Inch Slotted HDPE w/ Sock and Daylight Outlet Install small berm around upslope borders of BMP to prevent additional rtmof from entering and overloading the BMP. Line bottom, sides, berms and 2-foot perimeter around entire BMP with sod upon completion of grading, PVC pipe installation and underdrain installation. Cross-Section View of Proposed BMP Earthen Berm (if Required to Achieve 1-Foot BMP Depth) _ -- _._ ~ _ I. __. ~ti 1-Foot ~ Existing Ground (Approximate) 4-Inch Slotted HDPE w/ Sock and Daylight Outlet Top of HDPE underdrain shall be installed between 4 and 6-inches below bottom of BMP and covered with clean sand to finished grade. Ensure positive drainage to prevent extended ponding of collected runoff. ~_ ~1TCXISLL ENYIRONAfENTAL. P.A. ~' FUQUAY MARINA, NC 27526 OFFICE: 9 f 9-567-4682 FAX: 918-557-4683 6smenv{ronmentalOearthlink.nst PREPARED FOR: ve Raiders of NC, Ina 76 PurfoY Road, Suite 218 FuQuay Varn0. NC 27526 DATE:Septemtkr 13, 2007 SCALE: NTS ENVIRONMENTAL SCN]i11ST CONTACT: SCOTT MITCHELL, PE, LSS HARRISON PLACE S/D FUQUAY MARINA, NC - A'AKE COUNTY LOT 23 -BMP DESIGN SHEET 2 OF 2 ~~ ~ ,____-,,~-_:_~ 1 ~. ~--= =~11~=' i 1--~~1==E-_ j~;~~i