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Home My WebLink About20140786 Ver 1_CWS 401 RESPONSE LETTER WITH ATTACHMENTS_20140923i R r. 1 U r J WA- J ^ �r� 'J 'J T W N J r . J CC " > ) .. 3 , jf J J J W o EE S ni v 7 cj a_ sJ 3 a co Lu ZSo, J '� s s .J J IJ 7J x ^ ^ 3 r r- _ J ') r- ^ -G s Fj , s z / ) \ a »�£z » 7) ............. , !$ # }\} y� »� �;: &, �� w„��2 Jz \ \ \ \ \ \ \ \ \ \ \\ \�\ � \� \\ \2%3}22 - \ \ \\g\ /\ ƒ' /\ / ) \ a »�£z » 7) ............. , !$ # }\} y� »� �;: &, �� w„��2 2 / §/ ACRE$- b..rn u4nt� N �u iu,5b. 3 wly m PROPOSE WETLAND AREAS WETLAND AREA A E COMPACTED `EN B TO FILL BY GROUNDWATER w �„ Tqw MANAGEMENT TRENCH „ - DRAIN INSTALLATION I 20 VT ,; WETLAND IMPACTS A R N CRnaG SFlCTION WETLAND �IMACT D ROAD�CROSSIN0 WETLAND IMACT E & F CROSS SECTION 'T ON 99 (FORCE MAIN TRENCH WITH SILT FENCE) D I �.2 ; /ICINIT I ' I� I � to 13 � I I� BELVEDERE PLANTATION WWTP OFFSITE DISPOSAL A STROUD ENGIN c F: BELVEDERE, - SLOOP POINT ROAD SITE INFILTRATION BASIN SITES PENDERCOUNTY, NORTH CAROLINA PROJECT Er' A RNN'l - 2 -13 Revised June 2014 Basin B is located southeast of Basin A. Basin B is 11,700 SQLlal'e feet loaded at 8.55 gallon pet, (lay pet, square foot, Basin B is modeled for 100,00 gallons per (lay. Basin C is located northeast of Basin B. Basin C is 11,700 square feet loaded at 8.55 gallon per (lay per square foot, Basin C is modeled for 100,00 gallons per day. Each basin is modeled using drains at 24 feet elevation more than 1' 00 feet from each basin. The model simulates a low permeability wall on the otitside of the drain (Wall), in order to reduce impact of the groundwater control system on the nearby wetlands to the SOLIth and west, Using the calibrated aquifer coefficients, it is possible to simulate how a site might respond to a discharge hydraulically and how contaminants might migrate. A series of computer models were prepared to simulate mound height. Using Visual MODFLOWTm a ground water simulation was made using average and 8"' in 10 year rainfall data, evapotranspiration for summer conditions and local drainage to predict the water table surface. Factors that could affect the calibration could be related to drainage features, ET, specific yield or recharge as well as hydraulic conductivity. It slionld be note(] that modeling is not intended to predict the water table COtItOL11' elevation, except for general average annual conditions. The calibrated model is intended as a base platform to ShIll-Ilate the increase in water levels clue to loading. The model reveals the effect of drainage. As a result the model should not be used to offer a prediction, rather, as a tool to simulate engineering alternatives for planning purposes. The model was used as a basis for a loading model with the design infiltration loading rates of 8.55 gallons pet, day per square foot for 300,000 gallons per (lay of wastewater disposal. Tile modeled water level for a wet period in the 8 in 20 years wet rainfall year (900 (lays), was 38.1 feet above mean sea level for Basin A, 37.2 feet above mean sea level for Basin 13, and 36.9 feet above mean sea level for Basin C (Figures 613 through 6E, 720 (lays to 990 (lays for a wet period) (Figure No. 6A, Time vs Equipotential). The resulting water table surface appears to smooth the predicted mound from the the infiltration basins and surrounding drains (Figure # 613 -E, Loading Model 720 to 990 (lay - 8"' in 10 wettest year (Table 6, Rainfall and ET Data used in the Model). The calibration model was subtracted from the resulting loading model to prepare a transient water table mound model for the utilized areas at 900 (lays (Figure No. 7A-E, Loading Founding Model - 720 - 990 days). The computer model calculated drain peak capacity for the installed drains arotind the site (Zones 2, 3 an(] 4) to be 75,965 cubic feet pet- day or and flow of 568,218 gallons pet- day. mm sly SECTION L FFLUENT DISTRI UT10V SPLASH IAD PLAN VIEW GROUNDWATER OUTLET STRUCTURE -1- 112 1 GROl1ND11'ATER OUTLET STRUC'f UP.E 'c o �FJ ?� r its ' —p 9ya ��PF "' ro �( �c" ( �Ti�O 1 F'.... uui.... n�� I FFILUENT DIEM RIDHTION SPLASH PAD �A �0 sly SECTION L FFLUENT DISTRI UT10V SPLASH IAD PLAN VIEW GROUNDWATER OUTLET STRUCTURE -1- 112 1 GROl1ND11'ATER OUTLET STRUC'f UP.E �� \».\ � - � � � Ei�wv" K6 PL, f,A ION T 0 w Af� ` � \ .��« \ ~^ \� � / :� d� �� ^ \: /!� \ \� �� / .� �� \\ . « ? \�, TREATED WASTEWATER APPLICA11,9N SITE '40M ""'G "' 28- PHONE 17041 525-7GGG Al_. -... EN.NN Pl A _« WA NCDENR North Carolina Department of Environment and Natural Resources Pat McCrory Michael Ellison, Director John E. Skvarla, III Governor Ecosystem Enhancement Program Secretary July 1, 2014 Martin Lashua Carolina Water Service, Inc. of NC PO Box 240908 Charlotte, NC 28224 Expiration of Acceptance: January 1, 2015 Project: Belvedere Plantation Treated Wastewater Application Site County: Pender The purpose of this letter is to notify you that the North Carolina Ecosystem Enhancement Program (NCEEP) is willing to accept payment for compensatory mitigation for impacts associated with the above referenced project as indicated in the table below. Please note that this decision does not assure that participation in the NCEEP will be approved by the permit issuing agencies as mitigation for project impacts. It is the responsibility of the applicant to contact these agencies to determine if payment to the NCEEP will be approved. You must also comply with all other state, federal or local government permits, regulations or authorizations associated with the proposed activity including SL 2009 -337: An Act to Promote the Use of Compensatory Mi�tia_ation Banks as amended by S.L. 2011-343. This acceptance is valid for six months from the date of this letter and is not transferable. If we have not received a copy of the issued 404 Permit /401 Certification /LAMA permit within this time frame, this acceptance will expire. It is the applicant's responsibility to send copies of the permits to NCEEP. Once NCEEP receives a copy of the permit(s) an invoice will be issued based on the required mitigation in that permit and payment must be made prior to conducting the authorized work. The amount of the In- Lieu Fee to be paid to NCEEP by an applicant is calculated based upon the Fee Schedule and policies listed at www.nceep.net. Based on the information supplied by you in your request to use the NCEEP, the impacts that may require compensatory mitigation are summarized in the following table. The amount of mitigation required and assigned to NCEEP for this impact is determined by permitting agencies and may exceed the impact amounts shown below. Impact River Basin CU Location Stream (feet) Wetlands (acres) Buffer I (Sq. Ft.) Buffer II (Sq. Ft.) Cold Cool Warm Riparian Non - Riparian Coastal Marsh White Oak 03030001 0 0 0 0 0.138 0 0 0 Upon receipt of payment, EEP will take responsibility for providing the compensatory mitigation. The mitigation will be performed in accordance with the N.C. Department of Environment and Natural Resources' Ecosystem Enhancement Program In -Lieu Fee Instrument dated July 28, 2010. Thank you for your interest in the NCEEP. If you have any questions or need additional information, please contact Kelly Williams at (919) 707 -8915. Sincerely, Jai s. Stanfill Asset anagement Supervisor cc: Chad Coburn, NCDWR Wilmington Tyler Crumbley, USACE - Wilmington James Fentress, Jr., agent File 1652 Mail Service Center, Raleigh, North Carolina 27699 -1652 Phone: 919 - 707 -89761 Internet: www,ncdenr.gov An Equal Opportunity 1 Affirmative Action Employer—Made in part by recycled paper