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HomeMy WebLinkAboutWSMU_MRSV_Fax_19970924_Annotated 09/24/97 WED 11:14 FAX 7046641778 BK BARRINGER ! J001 B. K. Barringer St. Associates, PA. u, 11C0— 104 Westfield Center ✓ ri"141 Cv� Mooresville, NC 28115 N jo .-t" I (704) 664-7888 Fax: (704) 664-1778 FAX TRANSMISSION COVER SHEET Date: September 24, 1997 To: Brent McDonald RECEIVED Fax: ! 715-6048I Re: Shoe Major Variance Request U Sender: Dick Brolin199/ NonWATER'�lsciiargeQALITY SECTION Compliance Ent. YOU SHOULD RECEIVE 11 PAGE(S), INCLUDING THIS COVER SHEET. IF YOU DO NOT RECEIVE ALL THE PAGES, PLEASE CALL (704) 664-7888. Brent, Sony this has taken so long. Attached is a final rough draft of the additional information the Committee requested at our hearing. Per Mr. Teddar's comments, I am submitting our information for your review and comments prior to our final submittal. Additional information will be included in our final package from the Shoe's attourney and the Ford Motor Co. supporting the need for 5.5 acres of site for their intended purpose. Please call or fax your feedback ASAP so I have tine to submit prior to the October meeting of the ommittee. p^� eP41 1 Pb4 610,441. Liglikacd gr,H Thanks, %irks, oild Mr, (�,,� �►,�, r4L, �1 1/ 7 1 SAN4' p:1 -4 10(.4 r1-4 t� ►�., dl TSS ►-cam . o v- ,�,,( ,.,..Q teP,4 x,LiM(F`� /01^ �/�' S h,14 (j C `e € , .41 L.-et AA rj Y,lk11841,Adtkrev S S+^-e /Y roteb rA / tk7-`15 it.vt MlC ess'P) N�k✓.fYIuC A C/44•1/ O 1.--eh.cr l`di r<42 4� h. r e rot...4k ( ,.,.,. a L s.F-� t,t-jrit des%a-r,,%-Y-dd- 09/24/97 WED 11:15 FAX 7046641778 BK BARRINGER !j002 ADDITIONAL INFORMATION FOR MAJOR VARIANCE REQUEST FROM THE TOWN OF MOORESVILLE SHOE ENTERPRISES TRACT, NC 150 as requested by the EMC Water Quality Committee 9-24-97 The following information regarding the Mooresville, NC/Shoe Enterprises, LLC major variance request is being provided to clarify important issues addressed at the 9-10-97 EMC Water Quality Committee meeting. The proposed enhancements to the original watershed detention site plan are being submitted at the request of the Committee by the applicant. The applicant feels that a balance between natural and engineered BMPs which exceed regulatory requirements has beeil demonstrated for this unique site. Based on these enhancements and the clarifying information shown herein, the applicant requests the Committee recommend approval of the proposed major variance request. Attached for the Committee's review are the Town of Mooresville wet-detention pond bonding and maintenance procedures which will govern this site. 1. The applicant would like to refer the Committee to research by Wendell Gilliam, Soil o e_ Scientist at NCSU,Raleigh,NC on natural buffers. His research indicates that a 50'natural buffer offers the greatest benefits in preserving water quality. Gilli 's work focuses on the effect of natural buffers ' o.ettings in watershed where arge tract drain to rivers and s streams. Although not direc y related, his conclusions provide a va id consideration when ` determining t e impact on water quality of small commercial sites where maximum treatment techniques are employed. 2. The regulations embrace the principle that the run-off from the first one inch of rainfall collects the majority of non-point source pollution during that rainfall. Each additional inch '- of rainfall collects increasingly less non-point source pollutants. The design requi s for t is wet=detention pond are based on this principle. All run-off from impervious areas on the applicant's site will be collected and managed in a wet-detention pond which has been designed to 1.3 times the volume specifications required in the watershed regulations. Due to the larger detention pond, the applicant's storm water collection and management system offers greater protection than provided by other projects using wet-detention under the High Density Option. tJ 4ee "-�c .jam sila - v›o'f; 3. The subject site is distinguished from other sites using wet-detention under the High Density Option. Problems in accurately predicting up-gradient run-off volumes is eliminated due to the fact that all run-off up-gradient from the site is being diverted away from the applicant's site by up-gradient topography and existing commercial development. The fact that the subject tract is only 9.080 acres in size and is not impacted by run-off from other areas up- 00/24/07 WED 11:15 FAX 7046641778 BK BARRINGER lj003 gradient from the site is of extreme importance. tyt.`19- r fr When up-gradient run-off volumes are eliminated,the combination of detention an uffer techniques employed by the landowner provides more than adequate protection to e impacted watershed. With this greater ability to accurately predict run-off volumes affecting the site and BMP,the Commission should have greater confidence in allowing variances under this type of circumstance. 01,1 k 4. The buffer area as shown on the applicant's site plan will be designed to include the optimal O k( - c(y1 r plantings of tress, shrubs and ground cover as recommended by the Division of Water Quality. It should be noted that the only run-off to be treated by the planned buffer will be rainfall on the planned buffer. All other rainfall will be treated by wet-detention. The beneficial effect of using a 100' buffer versus a 50' buffer, given the applicant's site storm water design, is negligible. 5. Attached is an analysis of surface water treatment efficiency for the applicant's site. It should be noted, that the applicant's site is designed with a collection system comprised of 6"rolled curb and gutter and other interior stormwater collection measures which will collect all run- off front impervious areas on the site. Three site design configurations are compared. 1.)The volume of a one inch rainfall treated by a similar size site developed under the "Typical High Density(HD)Option w/1"Rainfall Detention"on which the maximum 70%impervious area ,r� has been developed is shown for comparative purposes. 2.) Also shown is the volume of a OtC- °14‘ one inch rainfall treated by the applicant's site (64% impervious area) if the standard 4 detention pond design were used, "Applicant's Site w/1" Rainfall Detention". 3.) Lastly, V\,, � � the volume of rainfall treated by the applicant's site (64% impervious area) using the proposed detention pond design of 1.3 times that required by regulation design standards, `_ "Applicant's Site w/1.3"Rainfall Detention" is shown. 0. The comparison shows that the applicant's proposed site development plan with an oversize wet-detention pond will provide 4,867.92 cubic feet more treatment volume than if developed with a wet-detention pond designed to regulation standards. It also demonstrates that the applicant's proposed site design with oversized detention will provide 3,346.70 cubic feet more treatment volume than a similar size site developed to the maximum with a standard wet-detention pond. Cite_ Conclusion. In this case,the issue of changing the size of the buffer, 50'versus 100',is less important than the effectiveness and efficiency of the storm water collection and treatment systems. The applicant's plan provides greater than maximum collection and treatment effectiveness and efficiency in its design. The applicant seeks a variance from the buffer demands of the regulations due to the uniqueness of his site and that he exceeds the efficiency and effectiveness demands of the regulations. The applicant's variance request clearly presents a development plan which preserves the spirit and the intent of the ordinance,protects the general health and welfare of the community and shows that substantial justice will be done for all concerns by granting the requested variance. B.K. Barringer & Associates, P.A. Comparative Analysis of Treatment Volumes Presented for Shoe Enterprises, LLC by B.K. Barringer &Associates, P,A. September 15, 1997 Typical HD Option Applicant's Site Applicants Site Item w/1" Rainfall Detention wI't" Rainfall Detention w/1.3" Rainfall Detention Factor/CFS SF Factor/CFS SF Factor/CFS SF Gross site size 9.08 395,524.80 9.08 395,524.80 9.08 395 524.80 Impervious area in % 70.00% 64.00% 64.00% Impervious area in SF 276,867.36 253,125.87 253,135.87 Impervious area run-off coefficient 0.95 0.95 0.95 Impervious Area Run-Off 20,879.58 19,089.90 24,816.87 Wet detention efficiency rating 0.85 0.85 0.85 _ Treated Rainfall in Cubic Feet 17,747.64 16,226.42 21,094.34 — - - o • g ss co i 5 n"eG�C gtc6/J a,15'"Yv� 4 y - r /y TS S rt4241.vV w• I cc go ti n co co er 0 n c, L=. 0 A W N rn ^ 03 0 09;24/.97 WED 11:16 FAX 706641778. BK. ...BAREI.NGER 1005 . . . .\ .."--).:' c , N. \s.... ---:---- ----7.-4.14\ (// -\_ylV .;' ( (-----.'..;.- ' • _•t____I . \:::'...11\‘'.:,.. `•••.,. 'L. k,...:•....--:-..:>il \ ..C(( i•--,7.- *.\- . 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I • \ \., -..• i ji • ( ------l-'7 / ' .1.1',---9 r''`../ /./ ',,, '''-`L.C.C.,‹ "---7 r---1,;:9..'e; 44-,k.;.::.7:'_A,'''':.\.\(gav ----=>••z.:!'!''7t"---- ./( i // / .4,/ •-• \-,\ .,'„,___\_-..r---: i ix ,,,44‘::-..4\,., -.14r7V,:.. -4.,- -.: ..-::_..F-g ...e. .) „ ,,, iviAk. , •• . - -nd -70c1-1.5 Po /.. „•11/ A. ,-.wps ...•‘ • k...-.r,i=4.4.i,•,.....,.: • • .;,.--4... _..-/ (1 " • ,.... ., ttot,..,.:" ! 3,j..v-..• ; ..",--) , q( .•..-. ,--7-•-.--Thl: 7_,,/ i / \- -) C V/4\ .' \t ,/ 1 - ,T,. 11:.);:r.'•'''•••• ' 1 lil ., '\ isiaiii;.--.-7• ,:.___. wg ,, \ / ,... .. .„.. „.._..„..:- „--(-..---, ,•-\ '---,....--, — ',.\ •-•',/,44itis:j ' 'I • '•••. - • / • • A - \ 1 . \... / '‘-.—___,.....„-\ \_,...,c--.... , ____:....,...„ . .2---711t.z.„.;.. „ 4 i , k"...---\ ___\ ..---- • ' ‘.• ..); \.\\\*.\ f's --- :(-\ c'' . \ C--.- -."' f-D-3-) '\11 _/(M11 47- ‘i( /‘ N.i.!.;.,{ • _(-- if . ..N.:%-----::-.7-a-„--Y( ' ' )%))) Y/3/' . --(1)-)irc ---- :-\ k - r\-/"A i j;(..‘ A '''.-•':'4::::: ),/tiLril.:-/-----))\:\::.,.:::::`--) ) • 09/24/97 WED 11:18 FAX 7046641778 BK BARRINGER g1006 Annual Inspection/Maintenance Procedures 1.) Annual Inspection: Annual inspections shall be scheduled by the Town of Mooresville and Owner on the first of June of each year. 2.) Inspection Activities: a.) Testing of the emergency drain pipe val . b.) Visual inspection of drawdown orifi . c.) Visual inspection of the trash rue t the intake orifice. d.) Visual inspection of the emerg cy spillway. e.) Visual inspection f the pon im and slopes. f.) Measurement oft e wet d depth(distance from the permanent pond drawdown orifice invert to ttom basin) at the dam end of the detention pond. g_) Visual inspection of al tormwater structures on the served site feeding the detention pond. h_) Visual inspectio of the total site drainage basin for adequate ground cover to stabilize site. i.) Visual inspection of upstream(off-site)areas feeding into the site drainage basin for potential off-site sedimentation sources. 3.) Maintenance Activities,if required: a.) If the permanent pond depth is measured to be less than 2',the pond shall be drained, cleared of sediment to a depth specified in the original construction documents and disposed of off-site. Off-site disposal based on sediment analysis. Pond to be reseeded as required to prevent erosion. b.) Riser mechanism shall be cleaned and repaired as necessary to bring the mechanism up to functional condition as originally specified. c.) Uniformly grade and stabilize any disturbed areas on the remainder of the site. 09/24/97 WED 11:18 FAX 7046641778 BK BARRINGER J007 Section 14.12 Enforcement 1. These regulations shall be enforced by the Zoning Administrator (refer to Section 11.1 -11 A of this Ordinance). In addition to his other duties, the Zoning Administrator shall keep records of the Town's utilization of the provision that a maximum of ten (10) percent of the WS-II BW Balance of Watershed be developed with non-residential development to a maximum of seventy (70) percent built-upon surface area, provided such developments are located in an EX-I or CU EX-I zoning district. The Zoning Administrator shall keep records on the.total amount of acreage available under this option, total acres approved for this option, and site specific information on each development employing said option including: location, acres, site plan, use, stormwater management plan, etc. 2. The Zoning Administrator shall maintain a file on all applications for minor and major variances. A copy of information pertinent to any minor variance application request (including minutes of the hearing, findings made by the Board of Adjustment, actions taken by the Board of Adjustment, names and addresses of all persons giving evidence at the public hearing) shall be submitted annually during the last week of December to the Division of Environmental Management, Supervisor of the Classification and Standards Group. Section 14.13 High Density Option A. General Requirements In any designated WS-II, WS-lll, or WS-IV watershed, any development (other than a single-family residential development) may occur using the high density options subject to approval by the Town Board under the rules and guidelines herein outlined. The use of the high density option for any particular project shall be subject to Town Board approval and, where deemed necessary by the Town Board, may be submitted to the Division of Environmental Management's Water Quality Section for review and recommendation. Except for Planned Residential community (PRC) zoning, the use of the high density option for any single-family residential development shall be prohibited. B. High Density Options Development Standards The Town Board may approve a project using the high density option (other than one for a non-PRC single-family residential development) consistent with the following standards: 14-18 09/24/97 WED 11:19 FAX 7046641778 BK BARRINGER 411008 • 1. If the area proposed to be developed lies in a designated WS-II Balance of Watershed Area watershed, engineered stormwater controls shall be used to control runoff from the first inch of rainfall for development which contains a built-upon area of 12-30 percent. 2. If the area proposed to be developed lies in a designated WS-IV Critical Area watershed, engineered stormwater controls shall be used to control runoff from the first inch of rainfall for development which contains a built-upon area of 24-50 percent. 3. If the area proposed to be developed lies in a designated WS-IV Protected Area watershed, engineered stormwater controls shall be used Zoning Administrator shall keep records on the total amount of acreage available under this option, total acres approved for this option, and site to control runoff from the first inch of rainfall for development which contains a built-upon area of 24-70 percent. C. Application An application for authorization to use the High Density Option shall be signed by the applicant and the consulting engineer and shall also be accompanied by the following: 1. Two reproducible copies of the development plan within the drainage basin containing all applicable and required information. 2. Two reproducible copies of the plans and required specifications of the stormwater control structure. 3. When required by law, written verification that a soil erosion and sedimentation control plan which has been approved by the appropriate State agency. 4. A separate fee shall be required for submittal of any high density option application. Said fee shall be in accordance with a fee schedule adopted by the Town Board. No application for high density approval will be considered complete unless accompanied with the requisite fee. D. Inspection Fees Inspection of all stormwater control structures will be conducted: (i) prior to approval of the high density option for any project; (ii) annually once the stormwater control structures have been approved by the Town, and: (iii) any time after improvements, modifications or changes to said structures have been made by the owning entity. A fee, in accordance with a fee schedule approved by the Town Board, shall be required to be paid by the owning entity prior to each such inspection being conducted. 14-19 09/24/97 WED 11:19 FAX 7046641778 BK BARRINGER Z 009 • verification. The total cost of the stormwater control structure shall include the value of all materials such as piping and other structures; seeding and soil stabilization; design and engineering; and grading, excavation, fill, etc. The costs shall not be prorated as part of a layer project, but rather shall be priced as an individual project. 2. Once the storrnwater control structure(s) has been constructed and inspected in the manner provided in Section 14.13(G) of this Ordinance, and approved by the Town Board, the Town Board may authorize the release of up to seventy-five percent (75%) of the surety bond or other equivalent device outlined in Subsection F(1) of this Ordinance, The remaining portion of the surety bond or equivalent device may be released to the owning entity in accordance with Section 14.13(H)(1)(c). 3. Prior to said release, however, the applicant shall be required to deposit with the Town either cash or similar instrument approved by the Town Board in an amount equal to fifteen percent (15%) of the total construction cost [as defined in Subsection (F)(1)J or one- hundred percent (100%) of the cost of maintaining, repairing or reconstructing said structure over a twenty (20) year period, whichever is greater. The estimated cost of maintaining the stormwater control structure shall be consistent with the approved operation and maintenance plan provided by the applicant as outlined in Section 14.13(E). G. Default 1. Upon default of the applicant to complete the storrnwater control structure as spelled out in the performance bond or other equivalent security, the Town Board may obtain and use all or any portion of the funds necessary to complete the improvements based on actual construction costs. The Town Board shall return any funds not spent in completing the improvements to the owning entity. 2. Upon default of the owning entity to maintain, repair and, if necessary, reconstruct the storrnwater control structure in • accordance with the approved Operations and Maintenance Plan, Tcwn Board shall obtain and use any portion of the cash security outlined in Subsection (F)(3) to make necessary improvements based on the actual costs borne by the Town to make such improvements. H. inspections 1. Inspections of tewly Constructed Stormwater Structures All new stormwater control structures shall be inspected by the Town after the owning entity notifies the Zoning Administrator that all 14-21 09/24/97 WED 11:20 FAX 7046641778 BK BARRINGER 0010 2. Annual Inspection of Storrriwater Structures a. All stormwater control structures shall be inspected by the Town on an annual basis to determine whether the structures are performing as designed and intended. Records of inspection shall be maintained on forms approved or supplied by the North Carolina Division of Environmental Management. Annual inspections shall begin within one year of approval of the Town Board's approval of the filing date of the deed for the stormwater control structure. A fee, in accordance with a fee schedule adopted by the Town Board shall be charged to the owning entity for annual inspections (and re-inspections) made. A copy of each inspection report shall be filed with the Zoning Administrator. b. In the event the Town's report indicates the need for corrective action or improvements, the Zoning Administrator shall notify the owning entity of the needed improvements and the date by which such improvements are to be completed. All improvements shall be consistent with the adopted Operations Plan and specifications. Once such improvements are made, the owning entity shall forthwith contact the Zoning Administrator and ask that an inspection be made. Vegetation and Grounds Management Landscaping and grounds management shall be the responsibility of the owning entity of said structure(s). However, vegetation shall be not established or allowed to mature to the extent that the integrity of the structure(s) is in any way threatened or diminished, or to the extent of interfering with any easement or access to the structure. 2. Except for routine landscaping and grounds maintenance, the owning entity shall notify the Zoning Administrator prior to any repair or reconstruction of the structure. All improvements shall be consistent with the approved Plan and specifications for that structure. After notification by the owning entity, the Town staff shall inspect the completed improvements and inform the owning entity of any required additions, changes, or modifications needed to complete said improvements. A time period for making such changes shall also be stipulated by the Town. A fee, in accordance with a fee schedule adopted by the Town Board, shall be charged to the owning entity for each inspection (or re-inspection) made. J. Stormwater Control Structure Specifications 1. All stormwater control structures shall be designed by either a North 14-23 09/24/07 WED 11:20 FAX 7046641778 BK BARRINGER Ij011 agreement described in Section 14.13(E) of this Ordinance. • 4. A description of the area containing the stormwater control structure shall be prepared and filed, consistent with Section 14.13(1)(2) as a separate deed, with the Register of Deeds along with any easements necessary for general access to the stormwater control structure, should ownership (and maintenance) of the stormwater control structure be transferred to another person, firm, or entity. The deeded area shall include the detention pond, vegetative filters, all pipes and water control structures, berms, dikes, etc., and sufficient area to perform inspections, maintenance, repairs and reconstruction. K. Town Board Approval Process The Town Board shall either approve an application for the high density option, approve the application with fair and reasonable conditions, or disapprove such an application based upon the criteria contained in this Ordinance. 1. If the Town Board approves the application, such approval shall be predicated upon the developer and the Town entering into a binding Operation and Maintenance Plan as indicated in Section 14.13 (E) and the posting of a surety bond or other equivalent security in a manner as provided in Section 14.13 (F). Such approval shall be indicated on the application and on both copies of the plans submitted with the application. If the Town Board approves the application, a copy of the application and ene copy of the plans shall be returned to the applicant_ 2. If the Town Board disapproves the application, the reasons for such action shall be sent by first class mail by the Zoning Administrator to the applicant within five (5) working days of the date of disapproval. The applicant may make revisions or changes to the application and submit a revised plan for approval. If the resubmitted plan is submitted to the Zoning Administrator within sixty (6D) days of the date of denial, the application fee will be waived. Section 14.14. Effective Date The effective date of the regulations contained in Article 14 and all defined words in association therewith to be added to Section 4.2 shall be July 1, 1993. • 1 4-2 5