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Home My WebLink About20060172 Ver 1_More Info Received_20060307L E T T E R O F T R A N S M I T T A L Alit Cyndi Karoly Date: March 6, 2006 ~{ O RVgTH 2321 Crabtree Blvd, Ste. 250 Project: Hope Valley Commons A.iS<~ ~~IATCS 2321 Crabtree Blvd, Ste. 250 Job #: 0479 Civil Engineers Planners Landscape Architects Raleigh, NC 27604 CC: Jason Payne, S&EC We are sending: Qty: Comments: Cyndi, ^ Sketch Plans Please find attached our response to your letter requesting more information for Hope Valley Commons (DWQ Project # 06-0172) to impact 779 linear feet of stream. ^ CD/Digital Feel free to give me a call should you have any questions. Thanks, ^ Shop Drawings John Schrum ^ Rendering ^ Development Plan ^ Samples ^ Specifications ^ Changes/Modif. ^ Prints / MAR 7 2006 DENR - WATEF"t c2UAUTv VIIETLANDS AND STORMWATER BRANCH ^ Other Signature: North Carolina 16 Consultant Place, Suite 201 Durham, NC 27707 p 919-490-4990 f 919-490$953 Tennessee 537 Market Street, Suite LL20 Chattanooga, TN 37402 p 423-266-4990 f 423-266-5700 , ), y,' r~ r ~~ HORVATH ~, ASSOCIATE S Civil Engineers Planners HOPE VALLEY COMMONS Landscape Architects QUALITATIVE CUMULATIVE IMPACT ANALYSIS Hope Valley Commons Highway 751 and NC 54 Durham, North Carolina DWQ Project #: 06-0172 Horvath Associates Project Number: 0479 February 27, 2006 MAR 7 200E Prepared for: Hughes-Baran Development, LLC 6409 Westgate Road Raleigh, North Carolina 27617 Phone: (919) 847-7309 Prepared by: Horvath Associates, P.A. Engineers -Planners -Landscape Architects P.O. Box 51806 Durham, North Carolina 27717 (919) 490-4990 [~ENI~ - VYATER QUAI.I': 9VETLANDS AND STORMWATER BRf+t~:;~ North Carolina 16 Consultant Place, Suite 201 Durham, NC 27707 p 919.490.49901 f 919.490.8953 Tennessee 537 Market Street Suite LL20 Chattanooga, TN 37402 p 423.266.4990 / f 423.266.5700 HOPE VALLEY COMMONS QUALITATIVE CUMULATIVE IMPACT ANALYSIS General Description Hope Valley Commons is a proposed shopping center located on the southeast corner of Highway 751 and NC 54. NC 54 is north of the property, Highway 751 is west of the property and US Army Corps Jordan Lake Flood Plain property is located east of the property. South of the property is an existing apartment community. A relatively smaller parcel of undeveloped land that is currently slated for office buildings is to the south and west of the property. The project is located in the Cape Fear River basin and in the F/J-B watershed protection district. This narrative is a qualitative analysis that demonstrates that cumulative impacts are not expected in association with the construction of this project. This qualitative analysis is based on "Draft Internal Policy, Cumulative Impacts and the 401 Water Quality Certification and Isolated Wetland Programs", NC Division of Water Quality, October 3, 2002, Version 1.6. Cumulative Impact Potential -Qualitative Analysis The proposed shopping center is anchored by a grocery store and is classified as urban infill. The property is located adjacent to US Army Corps of Engineers Lake Jordan Flood plain. Commercial development will not occur in the US Army Corps flood plain. A high percentage of the land surrounding the shopping center is US Army Corps flood plain. A copy of the USGS Southwest Durham Quad map, which shows the location of the shopping center and adjacent flood plain property, is provided. The anchor of the shopping center is a grocery store, and another grocery store-anchored shopping center exists across the street. The Streets at Southpoint Mall and numerous other commercial shopping areas exist approximately'/2 mile south of Interstate 40, which is just south of the proposed project. This shopping center area is completely disconnected with the property, but is the center of retail shopping for the region. The proposed shopping center will serve local residential neighborhoods and subdivisions. The immediate local vicinity is `built out' to a large extent, and the proposed shopping center is unlikely to stimulate the construction of any new single- or multi-family developments. Nearby neighborhoods that are nearly completely built-out include Hope Valley Farms and Woodcroft. Proposed Constructed Wetland A constructed wetland is proposed to treat stormwater runoff from the proposed retail center. This wetland will additionally treat the property that is adjacent to the site as well as some existing offsite property. Potential new development directly adjacent to the site will therefore be treated for 85~ TSS removal. A preliminary grading plan and watershed maps is included with this report. Additionally, preliminary sizing calculations are included. These calculations demonstrate that the surface area of the wetland is appropriately sized for full build-out of the site. Note that the impervious area is higher than 70~ because drainage from a significant amount of the dedicated open space will not be directed to the wetland. PRELIMINARY WETLAND Volume Check ,II. SURFACE ~~~E~'K '' ~ , Impervious Area = 19.42. acres Drainage Area = ?.4.'71. acres Impervious = 79% Average Depth = Z / b Average Depth = 3.00 ft (Assume min average depth (conservative)) From the DWQ BMP Handbook (11/95), the required SA/DA ratio =_> ~.i) 3.00 4.i) Lower Boundary=> 7(~.ft 2.$~ 2.=1d) Site % impervious => 78.6 3.29 3.29 2.73 Upper Boundary => BE).O ;~.3C~ m~.7R Area Required = 35438 sq.ft. Area Provided = 36048 s .ft. OK J. E. Schrum, P.E. 2/22/2006 i ~ ~ ~ ~ iiiii«~ ire r~r~~~~ C„' \ \ ,~ 6 SCALE: ~-80' `~ PLAN ~ ~ LANUS ANU STORMWATER BRANt:h ^ . ^ ^ ^ ^ ^ ^ ^ ^ .. .. .. . .............................. ....... .......... DRAWN BY: ; ~j J~ ~ ~i N ", i' HORVATH ASSOCIATES CONSTRUCTED WETLAND CHECKEDBY~ ~E$ x'':'~ t7t° 16 CONSUITAM PLACE, SURE 201 H CAROLINA 27707 L PLAN VIEW SCALE N.T.. DURHAM, NORT ATE P 919.490.4990 F 919.490.8953 SUffE LL'1D ET HOPE VALLEY COMMONS D 03-3-06 . 537 MARKET STRE CHATANOOGA. TENNESSEE 31402 PROJECT NO P 423.266.4990 F d23.266.570o 751 C 54 ~ N N C . . . . 0479 NT,NVP. crvu =a~ es.ccm 0 0 0 to 0 ~' C7 Q L Q) Y O ~ ~ O ~n _ ~ Q~ a L u 0 z E 0 uD O n~ ~_ o°o ~o o ao ~ ~ O ~ ~ L Q. Q c~ C O n N ,000'9SoS£ N ,000'SSoS£ 0 a 0 u~ 0 M1 O c=„-, ca ~ m p ~ a o ~ 3~' C~ N ~ ~ ~~ ~? r~- ""~~~~rr~~ s ' -ry `Q G ~`~•~°J W .~~~~.~"`...f ~ ~ O Q ;y ~ v ~~ G O ao ~ M1 ~ ~:E ~ ~~x ~~ ~. II ~ "`' ~ ' .s d z a' °o ~ iy ~ o i~ ~ 0 o i~ o ro ~ o w ~Q u a' •~ 4 fl O n z H ~---- ~ °` N ,000'9SoS£ N ,000'SSoS£ / ~---'' sigh Seh T~ ^ -' ~ _~ .~ • . •~.~ . A #~ ~~ .~ ~~ ~ 1:. _..~ ~ ~~, _ _ k ~ ~ _ __ ..., - -~ w ~ - ~, ~_ 1 R! ~ ~~~ {{rr .i ~~ _ ~ _ _. ._ . ~. _ _ r~ ti~ ~ --- ~.. . r. ~ _ ~ .. - -- ~ ~... _ } _. .. r - D ~~ MqR ~ ~0 N ~ v~H~ ~6 0 250 500 1000 ~~SANpSTrE~~ ~~q~R ~~y SCALE: 1" = 500' .............................................................. ....... 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