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Home My WebLink AboutWPO201400067 Study WPO VSMP 2014-08-06 COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY HYDRAULIC COMMENTARY FOR COVENANT CHURCH OF GOD RENOVATION / ADDITION 1 Prepared by Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY SITE DATA: LEGAL REFERENCE:TAX MAP 61, PARCEL 155 SOURCE TITLE: DB 1134, PAGE 635 PARCEL ADDRESS: CHURCH OF GOD (THURMAN HENRY, RAY HENRY, HAROLD HAGA TRUSTEES 1025 EAST RIO ROAD CHARLOTTESVILLE,VIRGINIA 22901 ZONING: COMMERCIAL MAGISTERIAL DISTRICT: RIVANNA VICINITY MAP \.111 .�,Z�i'eel[_FSte lIy` j2 tP2Y+19 a y.atl+i',= "ES. 3 ].i i F'f�'3 , �� y p{ 6 d ,, TuS/�II.. ;` �` ':g Yob ,.w 2 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY amrilWiiiim II Alctutel 2 ' -- 0 101411 , 4100 r:'" ON', StraCIVrt i i r It VSO Type 01-7 13 114441A4 • "SiSii41411try if*was Structure r4 i liaerieto ;, if. Structure 0 S ii4 ,- iii. V00//peal- '11 '1: t' , • t• IIIIIIIIIP ,,,,, if , •- i * , f 40, 47. • 4 ,r,; x telri TElst4slaNt .. 1 voit#1 i 1 - • 'El0i.,..%. N stir :It' .....,......... %mutest? $ 4ir 4it / i, iot t., SITE MAP 3 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY PROJECT NARRATIVE: The project involves renovation / addition to the Covenant Church of God (Church) Buildings. The proposed front addition will connect the Old and New Testament Buildings and will be a unified church front covered entrance lobby. The rear renovation located at the New Testament Building is to improve the existing rear entrance (east side). The project will also include a drive thru curb-side drop off areas for congregants for both the front and the rear entrances.(See Figure 1, 2, 2A, 5 and 6) CHRONOLOGICAL DEVELOPMENT OF COVENANT CHURCH PROPERTY: The property was purchased in 1978 zoned R-1 (farmland) proposed as a church property. The western boundary of the Church property abuts with the NSRR(Norfolk Southern Railroad) R/W (right of way) which pre-existed when the property was acquired. The development of the property incrementally started in 1979, continued in 1981 and 1990 with the completion of the Old Testament Building. Additional property development continued with the re-grading of the northern portion of the property from 1991 to 1994;to match the finish grade of the southern portion of the property. The construction of the New Testament Building followed between the periods of 1994 to 1996. All installation of the drainage structures, construction of curbs and gutters and paving were done in conjunction with the construction of the building structures. DESCRIPTION OF DOCUMENTATION: This documentation provides the drainage area comparison and calculation of the existing and proposed site conditions. This also documents compliance to 4VAC50-60-66(Water Quantity). PRE-CONSTRUCTION DRAINAGE DESCRIPTION: It was determined that the existing property is divided into 5 drainage divides marked Areas 1-5 for identification purposes. Portion of the Church property is occupied by existing building which is approximately 11.70%. The additional impervious areas comprising of asphalt pavements, driveways, concrete pads and entrances was determined to be 42.40%. The remaining Church property is comprised of landscaped areas, grass medians and fields which are about 45.90%. Please refer to Table-1 (Summary of Drainage Area)in the appendix. (See Figures 3& 4) Area-1 includes the northeastern portion of the property and the area that runs along the church periphery that adjoins Belvedere Boulevard. Great portion of this area is pervious(grass field)with some impervious area located at southeastern church entrance. Portion of this drainage area drains into Structure#3 (VDOT Type DI-7). Area-2 consists of the northwestern portion of the property and church periphery that abuts NSRR. Area-3 covers portion of the property that includes asphalt pavements, driveway and parking which also includes grass medians and landscaped areas surrounding the Old Testament Building out. This drainage area drains into Structure#7(VDOT Type DI-3C Mod.)behind the Old Testament Building. 4 Prepared by Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY Area-4 encompasses portion of the property around the New Testament Building which are mostly asphalt pavements, driveways and parking facilities with several grass medians. This drainage area drains into Structure#5 (VDOT Type DI-3C)behind the New Testament Building. Area-5 comprises the southern corner of the property adjacent to East Rio Road and Belvedere Boulevard.These areas mainly consist of peripheral grasses,asphalt pavements and parking facilities. PRE-CONSTRUCTION DRAINAGE PERFORMANCE: Based on the current drainage performance of the property, there has been no local flooding or drainage problems observed or documented. The Church property existed before development started on Belvedere Subdivision and the construction of the SWM basin back in 2007. The construction record drawing of the Stormwater Management (SWM) facility (dated June 22, 2006) as reviewed and approved(per 4VAC50-60-108)by Albemarle County(Program Administrative Authority)was obtained for documentation reference. Using the USDA TR-55 hydrologic method, Belvedere Developers analyzed a 42.30 Acres of watershed which included Belvedere Subdivision Development, the entire Covenant Church property and drainage area of commercial development along East Rio Road shown on Attachment(Belvedere Submission Sheet 22 of 34). As shown on the plan,the entire watershed outflows single point of discharge labeled analysis point #1A. Since the development of Belvedere Subdivision and SWM facility was approved by the County, it is assumed that all requirements for water quantity and quality have been satisfied for the current condition. The pre and post-development peak flows were calculated to check capacity of the existing conveyance system for compliance. These peak discharges were also used to design the current SWM facility approved by Albemarle County and used to currently reconstruct the outfall structure. The subdivision still continues to develop as the proposed Phase II ground breaking will be this year 2014. POST-CONSTRUCTION DRAINAGE DESCRIPTION: The proposed church improvements project involves renovation / addition to the Covenant Church of God Buildings. These improvements will limit its impact primarily to Areas 3 and 4 resulting to an additional impervious drainage area of 1380 SF. SUMMARY AND PROPOSED MITIGATION: As previously noted above, the proposed improvements will cause an increase of impervious area by 1380 SF. The additional impervious area will solely impact Areas-3 (1185 SF)and 4(195 SF). As a mitigation measure, we propose to obscure and seed an equivalent area of asphalt driveway at the southeastern church property entrance (See Site Map and Figure 7 for details). As observed, these areas are within the impacted drainage boundaries of Areas-3 & 4. The result will offset these construction impacts and generate a zero(0)net increase of impervious area. Therefore by using the one percent(1%) rule. The proposed project post-development peak flow will be in compliance to 4VAC50-60-66 Water Quantity Regulation, subsection C3b. 5 Prepared by Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY APPENDIX 6 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY likkg^y< Figure 1 PROPOSED LOCATION OF FRONT ADDITION / RENOVATION 7 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY MI;Mr''%'"Z"', • — ,utel,' ; , ;.•.,0•! 1 4A• A.A ° ' °A•c„ ° ,,,i .'.4.'?:•••,'Nk. * `",A. ' ''''' ;,-"' O. A , -4.-- , 41. 0..' P4-‘1;: ;1* 4X1 ;A 4°,•'°°' • . , . . ;ler IA f.,17'1„;"ri •:*".4#4.. 4i,,•..i.,Y,' -,':.1,,, 1 1 , '..., vc ! ,-. 1 Figure 2 PROPOSED LOCATION OF REAR ADDITION / RENOVATION 8 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY 1 t t sN Figure 2A PROPOSED 1,0CATION REAR i NOV 5 z 9 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY / ,;;;;-,-''''''''''''°—"#:' 4 1 , '1 villii,v. —itttio-s*ff,SAS,, 10,h,b,. 1 ti ,' , ,7 -',7-t7 !,:-TL;f;',10;, -,,,;(i.0,- .. sr ''''';'7,,,',,' '-.- NN I ilf ,,,,,, N. I ..„-........7,.. .z.::::., la Iry ijrzlisoriAnsirtivr 'Nall ' .., i -....-.... iri 1 $ .....,...... to,Tr'zirikENT 1 11 (if ,? k 1 I ,, , \,--„ I if' 4 fl . \ ,,,,.„ ,............ . f \ / ...,..1, / / '...4.. Itr.77* / / Y /5\ , , ''?, ‘., ',, Figure 3 DRAINAGE AREA- 1 (Northern Portion) DRAINAGE AREA- 3 (Around the Old Testament Building—no increse to the impervious area.) 10 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENT ARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY 0 41, :i. \it. ' ,',,, „,,,,,, ,,, 1 r -, --, ',„ -1-, '''''''' '''. ..'..,,.;.■,D.'”^ vdtWet 44APla,44.4,AMIErt \ „...,... /' „ it'-7.4 ,,:: ' /;/ ,/,' „tiNt.,4;.: , -, - -', -vElt rzT4Ait7r ,,, *IwOrlyiriir;Nr,i (-- tro.1,4,, fit r OLDAir r ' s ,,,i. y EsrA N i..4 i",..1 i.„14. nix :411,1;:lifilij; -- 1,. .,..,,......,1,,:irt.if44, / ** t■r, ,;:,'-1:10,,,,,, ' ' .;..'404.,,,-.7'.' S,.S. I., '*;*" lit:,'''. ''lat'il-',',.,.7 '',.ct•:-.P,'$, , • ,,,,,,,„,. , e Figure 4 DRAINAGE AREA-2 (Western Portion+ N.S.R.R. Drainage Area) DRAINAGE AREA-4 (Around the New Testament Building no increase to the impervious area) DRAINAGE AREA- S (Southern Portion) 11 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY \ OLD 1 TA'S T4ME.'v'T BLDG, 1 ----\\----j , git--- \/,'W 7'f.:S14 AIENT --,, A'E ir TESTA 1LN T .,0.. FRONT / MAIN 17NTI..19.NC 1 8111',DING ' 1 NE D' Tli',.cTMENT ) 'X\ ----A I R L'.:1R EN TiINCE i .*N. ) ,,.. .., -\\„ 1 , ,,„/ ./ __----,, Figure PRE-C()NS'FREICT1()N PHASE 12 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY OLD TESTAMENT IAMENT LJ a lip L . s5 sv _. ',, ;° PROP. I'RT %7,1', ENTIZeiNCE fili, .LOIN °�,,If li 1` tiE ' TESTAMENT BUILDING RE R ; _ ;a, ENTR, NCL' ,: a . . r c----\\ ,,,,,, -_,_, .„,, , fl - ' , ,,,,,,,ke, 1 . /,, -- \ / -N. „. _...„.., __ _ 7-------- . , Figure 6 PROPOSED IMPROVEMENT / RENOVATION 13; Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY / \ - / i i i ..,„ .,, 1 ', -/ +4+ d e 4 e 4. r d. 1. %4' •. 4 . ... ÷*4' Proposed Area to be obscured -+-/ - . \\ ts•I ,,, 4 4 ti ..,,, 0 Aeiliki oSit / iht;710 .,„„- // 4' *It / Figure 7 PROP()SED AREA TO BE ()BSCU1ZED anti SEEDED 14 Prepared by: Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY CALCULATIONS 15 Prepared by Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY 1.0 Drainage Area Calculations. (Existing Condition) Drainage Area discharging on to Belvedere Boulevard.(Northeast Corner of the Property) Ala= 62,881.76 SF. 1.44 Acres (Pervious Area) Alb= 5,663.16 SF. 0.13 Acres (Impervious Area - Entrance) A1 = 68,544.92 SF. 1.57 Acres Drainage Area discharging on to NSRR(Northwest Corner of the Property) Ala = 5,447.23 SF. 0.13 Acres (Asphalt Pavement) A21,= 3,762.85 SF. 0.09 Acres (Landscaped Area) A2c = 1,500.00 SF. 0.03 Acres (Shed) A2d= 1,358.83 SF. 0.03 Acres (Pavilion) AZe= 29,609.05 SF. 0.68 Acres (Pervious Area) A2r+g= 4,048.40 SF. 0.09 Acres (Impervious Area- Rock Driveway) A2= 45,726.36 SF. 0.96 Acres Drainage Area discharging on to DI2 (Behind the Old Testament Building) A3a = 8,745.93 SF. 0.20 Acres (Grass Area) A3b = 47,713.48 SF. 1.10 Acres (Asphalt Parking and Pavement) A3c = 3,587.77 SF. 0.08 Acres (Concrete Walk and Entry Way) Aid= 7,534.60 SF. 0.17 Acres (Landscaped Area) A3e= 11,090.40 SF. 0.25 Acres (Existing Old Testament Building) 16 Prepared by Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY A3= 78,672.18 SF. 1.81 Acres Drainage Area discharging on to 013 (Behind the New Testament Building) A4a= 3,425.12 SF. 0.08 Acres (Grass Area) A4h= 6,677.07 SF. 0.15 Acres (Landscaped Area) A4c = 3,255.54 SF. 0.07 Acres (Concrete Walk and Pads) A4d = 21,546.75 SF. 0.49 Acres (Existing New Testament Building) A4e= 38,460.32 SF. 0.88 Acres (Asphalt Parking and Pavement) A4= 73,364.80 SF. 1.68 Acres Drainage Area discharging on to VDOT Facility. Asa= 3,563.29 SF. 0.08 Acres (Grass Area) Ash= 13,108.41 SF. 0.30 Acres (Peripheral Grass Area) A;c = 20,583.97 SF. 0.47 Acres (Asphalt Parking and Pavement) A5= 37,255.67 SF. 0.86 Acres 17 Prepared by Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY 1.0 Drainage Area Calculations. (Proposed Condition ) Drainage Area discharging on to Belvedere Boulevard.(Northeast Corner of the Property) Ala= 62,881.76 SF. 1.44 Acres (Pervious Area) Aib= 5,663.16 SF. 0.13 Acres (Impervious Area - Entrance) Ai = 68,544.92 SF. 1.57 Acres Drainage Area discharging on to NSRR(Northwest Corner of the Property) Ala= 5,447.23 SF. 0.13 Acres (Asphalt Pavement) Alb= 3,762.85 SF. 0.09 Acres (Landscaped Area) A2c= 1,500.00 SF. 0.03 Acres (Shed) A2d= 1,358.83 SF. 0.03 Acres (Pavilion) Ate= 29,609.05 SF. 0.68 Acres (Pervious Area) A2t4g= 4,048.40 SF. 0.09 Acres (Impervious Area- Rock Driveway) A2= 45,726.36 SF. 0.96 Acres Drainage Area discharging on to D12 (Behind the Old Testament Building) A3a= 8,745.93 SF. 0.20 Acres (Grass Area) A3= 78,672.18 SF. 1.81 Acres 18 Prepared by Eulogio A.Javier II PE COVENANT CHURCH OF GOD HYDRAULIC COMMENTARY COVENANT CHURCH OF GOD ALBEMARLE COUNTY Drainage Area discharging on to D13 (Behind the New Testament Building) A4a= 3,425.12 SF. 0.08 Acres (Grass Area) A4= 73,364.80 SF. 1.68 Acres Drainage Area discharging on to VDOT Facility. Asa= 3,563.29 SF. 0.08 Acres (Grass Area) Ash= 13,108.41 SF. 0.30 Acres (Peripheral Grass Area) A5 = 20,583.97 SF. 0.47 Acres (Asphalt Parking and Pavement) As= 37,255.67 SF. 0.86 Acres 19 Prepared by:Eulogio A.Javier II PE