Loading...
HomeMy WebLinkAboutSDP201700009 Assessment - Groundwater 2017-05-02 sHimp PROTECTCIVIL MANENGINEERAGEMEINGNT LAND PLANNING ENINEER ! NGIY: May 2,2017 Matt Wentland Albemarle County Department of Community Development 401 McIntire Rd Charlottesville, VA 22902 Regarding: Boyd Tavern Market Water Usage Report Mr. Wentland, We estimate the daily water usage at Tiger Fuel's Boyd Tavern Market, located ott of Back Cat Road,will not exceed 800 gal/day. This estimate is the result of a comparison of Boyd Tavern to three other Tiger Fuel Market locations within Albemarle County, including the Market at Bellair(Ivy Rd.),the Market at Mill Creek(Avon St.), and the Market at 5th St. (5th St.). The comparison includes VDOT 2015 average annual daily traffic(AADT)estimates, hours of operation,number of gas pumps, and whether or not a deli is present. Water usage data provided by Albemarle County Service Authority(ACSA) and City of Charlottesville meters for these three locations made it possible to determine the anticipated water usage at Boyd Tavern Market based on its similarity to other sites.The table below summarizes the information collected for this study. Mill 5th Creek Bellair Street Boyd AADT 11,000 13,000 19,000 7,700 6am- Hours 24/7 11pm 24/7 TBD Gas Pumps 8 6 12 12 Deli Yes Yes No Yes Daily Usage (gal/day) 803 903 829 - Boyd Tavern Market is most similar to the Market at Mill Creek because of its location and traffic volume. Both are located to be convenient for commuters to stop on their way to and from work to get gas or food from the deli. The Market at Bellair is positioned similarly, but with a much higher AADT than Boyd's main road.Other factors such as number of gas pumps and hours of operation did not have a discernible influence on water usage. We do not anticipate the AADT of Black Cat Road to increase due to the new market.Although the market will be located off of the interstate, it is unlikely that interstate travelers would stop there for gas when there are more attractive options in Zion Crossroads to the east and US 250 to the west. Convenience stores have limited water usage in general, and Boyd Tavern will be using water efficient toilets and sinks. As an example,the Market at Pantops off of Richmond Road has an AADT of 52,000 (6.75 times that of Boyd Tavern) and shares a water meter with a fast food restaurant, yet only uses 1,120 gal/day. Boyd Tavern Market will have toilets that use only 1.2 gal/flush, as opposed to the 5 gal/flush used in the other Tiger Fuel markets. They will also have motion sensor faucets, which can save 30%-50%on water usage. After considering all of the data,the upper limit of expected water consumption for Boyd Tavern Market is 800 gal/day.Supporting documents are attached. If you have any questions please feel free to contact me via email at Justinashimo-enoineering.com or by telephone at(434)953-6116. ' Shimp mp Engineering, P.C. Supporting Documents Attached: Tier 3 Groundwater Assessment ACSA Monthly Water Bill for Mill Creek Location ACSA Monthly Water Bill for Pantops Location City of Charlottesville Monthly Water Bill for 5th St. Location Mill Creek Floorplan 5th St. Floorplan • Atemwle Canty Service Authgbrlty 188 Spotnap Road I'h� 977J811 Charlottesville,VA 22911 E-mail:custeervikerrviceautho :,46660 Tx Tiger fuel Crmil1any II'1lljpr dnlrIrlllr iml�lhlh,lIo(I IhIIIun16Uh ACCOUNT NUMBER: BILLING ID: Amount Due $ SERVICE ADDRESS: 1345 Parham Cir BILLING PERIOD' 08/22/2016 TO: 09/21/2016 METER READINGS: CHARGES PER 1,000 GALLONS AMOUNT Water Remainder 87.70: 24600 PRESENT 604i CONPR 100 CONSUMPTION(GALLONS) 24600 LAST PAYMENT 09/19/2016 $434.43 CURRENT CHARGES DUE DATE 10/24/2016 TOTAL CURRENT CHARGES $ DISCONNECT DATE 'BALANCE FROM PREVIOUS BILL ACCOUNT BALANCE $ 'Any balance iron previous o18 not credited to your account by the"Disconnect Date"may subject your account --disconnection.BILLS ARE DUE WHEN RENDERED.TO AVOID INTEREST CHARGES AND PENALTY,PAYMENT OF YOUR ACCOUNT BALANCE MUST BE RECEIVED BY THE DUE DATE. There Is a 10%late payRrent penalty plus Interest eharyes of 1.5%on all outstanding balances not paid by the due date 28400 — AVERAGE MONTHLY 25100 ` WATER USE: 24100 -- I I 20900 — El Estimated 16700— - - , ' 11 12500— ; ; , . Actual 8400 — , 4200— 0_ e • • .... Rai$e3541O 335361,31d O0V31J03 3 A9AVd01 100143S tiny inr Nnr AVW NdV NVW 834 NYC 330 AON 130 . Ili : : r 055 0060T TenyOV ■ 00►LZ SaeIL Pa4eutt;e2 I 1 OOELZ 009EE 15SA /MINA OOLZE rrIzelN 93QN8AY 000LE oleP Opt,eql Aq Plod 10o 0005e8311 68811103151 0 Be uo%9'1 l0$06A9g01va104U[snld/wood Iu00iAed spy%O1 0 51 o1ey1 31V0 3(10 3H1 A8 03A1303113H 1SO4*i 3ONV1VB _Wf1000V LIfOA 3O 1N3WAVd'AilVN3d ONV S3OHVHO 1S3331N101OAV 01'03H30N31:1 N3HM 3(10 3EIV STUB t0auuooslp 0;Jun007e Jn0A 10efgns Amu„61ea SOeuuoO$;q,eta.Aq Suno3Oe NIOA al Pallp.JO you ipq snotmud way aoueleq AuV. E 6 S S 3ONV1V81N11000V 1118 S1101A38d WOtld 30NV1V8. 31Ya 103NNOOSIa E65S S3'JHVHa 1N3H11f101V101 9t0Z/80/LT 31V0 3T0 S30t3VNO 1Nomt11YJ SL'E6S9 1NOONV Q 9TOZ/E0/0T 03A1308H1N3VIAVd 1Syl V t co, ,. Jc_ le, OOOSE (SNOTIVO)NOil4WflSN00 ...,.1.,.,.a �' OOOT N3ldillflVl TOL 1N3S3Hd �t 999 S(IOIMIld '0$ •ta54 sown 666 0009E :04'46 x•p1t<ru.e x•+1.6 Aiepu03OS luew4Id .92:6 0004E 1OL'L*l•P* SSS r191 10111V SNO1 1VO 000'1 H3d 0301:IWH0 :SONIOV3t1 t13L3W 9TOZ/E0/0t :OS 9I0Z/T0/60 'oo.N3d ONmle Pi Pa00tg0TN Z6TT :583110OV 301A83S 59IS-6000 99T0 :OI ONfi1I9 SL'E69B et1Q;400W'k/ TO-OELOObT0 :9391WIN11411000V `w1 (AL 1^.r1hmIUMly pyylli midi11i1ybkb11nIi111gIN1 �-,l AL( ')ij QQ')(d.i 6.091-Z06EL VA '°ZL09T Ie4J ld 9L 1S1 X0S Olt , Auedsio0 Tend ae6T1 01 c�S) i, �0-�Stia Cry_ 6wxrp&rr; )AWo/pn9 b 001AJ3SOAIOSISr :IO3w ma -3 1 VA`010»0110Ve11`3 Ii II M 9)!A J9S (V 90-8L8 E1r1 xaj Peotl deulodS es 0 , -]�n Y 9V-LL6KVaeNd .41 l;r;;i};1tTIrliV . . . ,.. CITY OF CHARLOTtESViLLE i • • .__. Department of Finance !licermtiNb. " I IlifferstAB401160 i TIGER FUEL CO Utility Baling Gave ME . P O.Ms 641 'F.'-.7.77."--.----i----------- ---- We Chadottesene,VA 22902 ,11911100111 ,10/23/2016 Siete Alldirea . 1154 5TH STREET SW :-irara,ar 434 970-3211 i.... • I int# 434 970-3212 Fax 866 660..5185 Credit Card Per-00nt 1:11010gPill041 1 00/188016-10/1712016 yornachariottreville.onyiehty I • SHON iNION SINN TOW1 Pm.",361 CuPoMR6•6 • OWN. jimmy,/FRO*.i..Carfactior Pall PGA Foliar ..— Wow i Ached 6410 ttraS WO 1 I 1 I L 1 , i 1 MONTHLY USAGE . DAUM%SUMMARY 1 t " New t Mewls 4 !ANA 1 ACCOUNT STATUS Water Cu.Ft 2780; 3015 3323 i PREVIOUS BALANCE GAL 20848 t 22554 24858 I pa i 10/1372016 BEGINNING BALANCE ass Did yaw know Hat you an pay your ulay 181 from your bank account automatically? Water an'EasyPay"customer Calf 434 970-3211 or veil yninv oha8o1008v60.or9 cumuna CHARGES " _ DUE DATE:11/17/2018 ACCOUNT BALANCE PAY THIS AMOUNT 9 2 /LX) ' CIS 0 CURRENT CHARGES DUE BY 11/17120160R SUBJECT TO A 1,19XFINANCE CHARGE BEGINNING BALANCE DUE IMMEDIATELY ALLOW FIVE DAYS FOR POSTING OF MAILED PAYMENTS PLEASE DETACH AND RETURN THIS PORTION WITH CHECK PAYABLE TO CITY OF CHARLOTTESVILLE f.41* 0 City of Charlottesville iiiovie '110/23/2016 iAoccountiliki. leap- - $ - i:-' i,. i Department ot Finance i• — — ..._ Utility Billing Office MOM P11061 0 08/16/2018-10/17/2016 Tolut Due $ PO BOX 591 I Service Address 1154 5TH STREET SW Charlottesville VA 22902 1 One Ws 711/17/2016 jAmount IS I (434)970-3211 ._ 202 31.14904 00 00000210 0000050i TIGER FUEL CO PO BOX 1607 CAARLCYITF5ViLLE VA 72903-tea? - — EQUIPMENT SCHEDULE 1RN ON. n4srp ,,1 N 41LL/int100 IN OP MO I. id_ r•s J- 4Q 1 ' AH111111!!�P0'MN1I/MONO kars o La4a L•7f1U=snR7c7eesCII . o..— VD s a f7Fi 00 M`RMME.„.S r, - t1 ill00�I .....,...1Y . urtcw i'11 'oIt F.`., lill111 7H:,'c-il:wy7 w n rs ....' s Na4F c•.14 ■Just: *set r lia se m ;. .A - !RP: c-1m+M V 1/MOE V f4YI !1srvMMN I000-14 '10 MI RIO 13-W NU " ;Ill oo- oeLOLsv © ea LOLo - Fi ar,avohE4 i. LiR� ...... okt----milom-1-mrd . i.m . mr. ----Y__ 1 .,,.. r. E , n��l ® I CIO Lvo 16 :0 241.37WWRI,167. E 1 r om o LTEII ®❑ —I © e0 , R T M E IRWIN O tinilliallI �ifmFlwm A M S NM o- x 74 N wo �Ne �® o�� vb ,Sd (; O�OB p �.N 'El —ail ZiNr0A tree PC i .% . -- .. _. rEVAM SA,rwx IIUIIII: : INN1 ❑ >r wa awn i..soon _ - •MK O04NGa �., N-NOW NNW _. •OYIO WO OIRY ma t:Y l 0 a,s NIl maw a Hamm comma 10.Hum,Ha at CC1 mem NO emu N®44 Hawes 4 4Nm1A Femme a WPM PON Wu mem As rt 1Wl A ONYfm NO ro `= L f� 01011 NON x c 4 PO NM SON ROOMrm PR Mu iOxAm MINIM aNua s.IXr,MHOU LOOM seal wa on. WI 4 9k R4e01 I 04 MUM AN SOW NO MN MON(912 MR 11 NI N1Ne410 NINE 141014 i --,1— --❑ ❑ . -„—, �— --1--,1--_—. ,1 THE C10E(Z DESIGNC�iCUP O N*N0114R TIGER FUEL COMPANY MILL CREEK MARKET I� _ ❑ ❑❑ ❑❑ _0 I7 ❑❑ ❑❑ AVON STREET EXTENDED L ___________—__—_____ __ _ _______________-____—______________ Aa4Cr: EQUIPMENT PLAN&SCHEDULE OWN:LTG Ott VS 9GLLL 44 NNW OWN NM EQUIP111ENT ARRANGEMENT PLAN "°' yse =won EQs SCALE 1/4,V-I' REVISION NO. 0 • • — EQUIPMENT SCHEDULE I EQUIPMENT SCHEDULE dates .a. —how M>< o, -AAA ...wmomorral AMON.10. .aR e w 6/15/2007 R .noLaoo.R:Rl.e 6/31/2007 MOO r" 0 0 100 ,. ,. - • Ow -- _ __.. .2196p - ' •.Re CO OLr. w pn nc..•�n.�.ee 1 ro•,.enl0 mn91o.•nn.m I nw•a s - - nln.n0ar.0a _NM M « •acwOea min0.c+lolm a s as•mrMrnp - - - M,a , as A 2.2,WWI. ,a0 0 0 IMO I AM o ui- - MA I-. . . .,,,,,,,,,,.....,,,,,...map,, .no.mea q - IV a..wapnowo.,.w®® 0410.0.11.6110.24.e R _ _ • 200•b ',. ..12 c - _ eR.a p..al rWpaL SWAM �:.. - IN+Rp . .9Ep4T1:2210 sil 0 'p _ • w.WO O.IW.oat @ Q I a ,v Ye -0GIMixRl ui-sY. — ; lui.pi. . p A. • M.IO OA._YMMIxa .... I,n:vlr. 61 Op . O WM MI.001100 W.0 • i. 2.01 __ Ovw mama nn�omt.ra,.m dUpgnR.MO <-pVbrtfVnn 9tl E. 1..............�, ' ISM.,la nwsm w m.0..01...x,n..NO MO mmm102WAW�m•nw..nn:.R W.R. mnw xem sn,ac..cvoo C ,,, .ow 0 Ip 0 +m . . 0) 5��4 �..a..l �� rti ate' i 0 1 1 I i ® 1 t I I i 19 N ` I �'� .4° o sti t �j J I ® .../ STORAGE I �R IILL Q C< - o �� WAIF-RI RENbGMVI! o o a> a i I II II i © col m c da a© -��_ h . A _---1 •� GALA ROOM 9 ( eS < '%%% S S. ly* n,,--,...., © NeoaN CD �4{ / COMER — MI.• II 0 CT Li W 4 —_ ir' i .:3 ° :-)re7-_,rK: iiii 0 0- CO MEN / `\ " 1=1 II scale:as noted ��0}^fat I1 s ' J 'V - --- — d/L— R __.- wl ® I �®1111 drawing no. I EQUIPMENT PLAN Filth Street WpMnp '»"Q sheet no. EQ1 Boyd Tavern Market TMP 94-39 Tier 3 Groundwater Assessment Groundwater Management Plan Prepared for: Shimp Engineering, P.C. Charlottesville, VA Draft submitted March 31, 2017 Nick H. Evans PhD CPG Virginia Groundwater LLC PO Box 1424 Charlottesville VA 22902 nick(c�virginiagroundwater.com 434-466-1280 1 Key Findings Hydrogeologic setting: Located in gently rolling topography in eastern Albemarle County, the property is underlain by about 45 feet of soils and saprolite, and fractured mica schist and metagraywacke bedrock. The parcel is at the crest of a low divide between the Middle Rivanna and Mechunk drainages, about 1000 feet east of the Mountain Run fault zone. Groundwater availability: Favorable. Are hydrogeologic conditions favorable to proposed use? Yes. Contamination threats on record within 2000 feet of parcel? None. Additional contaminant threats observed in field reconnaissance? None. Anticipated impacts of proposed use on existing users of groundwater: None. Groundwater management plan: Implement runoff-neutral development to the extent possible. 2 Project Overview The proposed development is a convenience store to be located on Black Cat Road (Rt. 616) immediately southwest of Interstate 64 interchange 129, in eastern Albemarle County (Figure 1). Figure 1 +�.' �M`son Co. R.x;kinghaltl Co Y6 ' y. Y `'•� Gene o. . r 231 ,,I1L--' 'C). ,1,.\.---441(k !a,'.04',Iii; . • . ...�.cc 1_ ( �� 2• 1 . 231i 21:471:: WI)iM St 411-' .ta Co Hal _r. 231 Y ._ J Wayn .Croast J vs* - 1 eon ' G� V - : \�\ '/� �, •' a } � Y., gf 151 .- « , ;t t 4 f Yifdk, ....v....._ , ,,,,\,,f I -s Ai ...Ili ` } r NM , /0.1 s3 fee. 1 4 , t , 7, a 201-,- Woodridge �.. -,, g v)i, Cdy ' Ile S.ir I H� _ S a i'`` 6' �� �' 2 Pluvanna Ca 9 1 *• '( t Nelson Co. J J( 1•� }I g S" le `-L J 6 _ 56 Howe; ville Buckingham Co. Cumberlanc The parcel includes 12.486 acres located on a drainage divide between the Middle Rivanna River and Mechunk Creek drainages (Figure 2). The parcel slopes gently westward, with elevations ranging between about 420 and 460 feet above sea level. Existing land cover on the parcel is mixed forest in the eastern portion and open field in the remainder. Surrounding land use is a mix of small lot residential, farmland and forest. A site plan showing the proposed development layout and approximate land disturbance is attached to this report. 3 v Projected average daily water consumption for the facility, based on historical records of water usage in a similar facility operated by the applicant, is 800 gallons. Wastewater will be disposed of through an on-site drainfield. There is no existing well on the parcel. Figure 2: Watershed boundaries and topography, TMP 94-39 7,1\1%\w‘29..,,y4:-;44.),Q\10 \,,,,,,,1/741 ,,. ...1.01 „.„-i--„... 40 ,..;-/ii, ----.. .... * , ) :/ -------- -\,-z._>6L—(4,-, l.))s.i:i0. # .lt ,, l01,fair j 44 @ /� :t.4,))) e ._. ...'er` r.° lC_ ��^-� ,,,,,.., ., t , ,,,,_ % 1 -,ir - ^1 . sSELMAN R `C ...\,. ----- '?1 tilt - v� . '' ate•..- ;�1� '' l .,,► r -,,41 /0 yam- �� .,u • I il , 71. if"--- ;/ \\W: ,ip /..."----- 44, ''' 'J?'.':: N.t‘N... ------, . ":fpri.iiitelial N,,,_,,. .s.,..4044,1 t.:) ''*.'rii.. '(''4hp IIPN."4111)11 ,;4.j - ,,,,, e; g i .0 •'ER-lp /� ,,396•R ass �ss: - - fly „ , , ,. '''''',/4w 7., ,:_„. , ") irr, ' --- , ) -1 j .,... ,‘,... 0 ) r;"/ _tea,//� - 790 ft .�--1 t \r` 41 77� .r .. :-c(t-444' %P`-----,,, )%to .. :,"\-41011- VII Q-4'. 4ll )__4 \-1— I - ---- ?e r'l Hydrogeologic Assessment Bedrock geology, fracture density and water well productivity The parcel is located a few hundred feet east of a regional geologic structure known as the Mountain Run fault zone. This zone of fractured bedrock rock including limestone juxtaposes mica phyllite to the west against schist and metagraywacke to the east. Bedrock on the parcel includes schist and metagraywacke which are likely to be heavily fractured due to proximity to the fault (Figure 3). No bedrock exposures were observed on the parcel during field reconnaissance. 4 S � Figure 3 : Bedrock geology in the vicinity of TMP 94-39 (adapted from the 1993 Virginia Geologic Map) e \ _ ,.. 0 ' 1 1 (k, a 6k.e/: ilopoili 0 odeellitik -- - .. .-- Np 14 .�,� ' M `ate \upoc41 • ,ioik �4.4iik 6, v" .`�a F ,�a r'� V _lJ . e, \___ , ', e / ,\ rA` ~ ; / .1.7 MWOrkiM MWMAI iNeigroiwuiVeM myrimkr _L— mwevykew nnnnn — In the absence of good bedrock exposures with which to directly observe bedrock fractures, the yields of randomly-sited water wells can be used as a proxy for fracture density. Table 1 (below) summarizes data from 290 wells in the County database that were constructed in the same bedrock formation as underlies this property. The average yield of this group of wells is 7.7 GPM (gallons per minute), which is low to moderate relative to average yields from other geologic formations in the county. (Note that dry holes or "zero" GPM wells are under reported in the database). 5 I yield total well depth casing length Geologic map unit (gallons per minute) (feet) (feet) count ®q 1 I I CZpm 0 (mica schist and average: 7.7 average: 179 average: 50.4 290 metagraywacke) maximum: 75 maximum: 630 maximum: 322 There are 11 domestic wells in the database and 4 public water supply wells within 2000 feet of the property (Figure 4). The average yield of the 11 nearby domestic wells is 21.5 GPM. This is almost 3 times the overall county-wide average for wells drilled in this geologic formation. The greater yields are likely due to increased bedrock fracture density in proximity to the Mountain Run fault. Figure 4: Existing water wells and known yields in the vicinity of TMP 94-39 Key: ' 12 public water - as 7\ zo supply well �� ,,,, ® \ (VDH oversight) �-- w`�, private well ' - == - _-- in County database 30lit*— WafeisheriM�ah tershed Watars a Middle Rlvanna River .�� well yield , i�a h (gallons per 20 minute) ems$ O ` �. '*#, r drainage 4 divide • 1'*L' ''''' W Ali r 794 a rt..I scale: 1000 feet i , NT 6 Groundwater recharge and flow paths Groundwater recharge and flow in the Virginia Piedmont begins at the surface where rainwater soaks into soils, saprolite and weathered rock. The groundwater percolates downward to enter fractures in the underlying bedrock. At shallow levels, recharge and flow direction are influenced by both topography and the thickness and character of soils and saprolite. The proposed site is positioned on the western flank of a local drainage divide, with the divide almost coinciding with the eastern margin of the parcel (Figure 5). Because there is no adjoining land topographically above the parcel, the parcel does not receive hydraulically-driven shallow recharge from off-site. Figure 5: Drainage divide and predicted shallow groundwater flow paths in the vicinity of TMP 94-39 \\...„..40\ .., 1\--- yc ,,e, N.7.1 _,..j),,,.,j,, , , ...s___,_,,,, ! ,:, zr, . coov _ts --\J , z /coeia. ,� .1(..„ , Q ), .--- ,.... r c„,%._.) , ,,J c,,/ ,s_,.() ,. ,:„...,..;, , kes,. 4 ,t„ . , Atty , . -4-ACM. Ue` R )4,-(v �f"_"-c�� sis �� w '(� � �.. `� �� .�'ry , (M w , ) Middle Rivanna $ ,./_..-ri CJ.h \ ° ! - :�q W. Mechunk Creek �''` k ,Ro .� �( drainage divide r_ (:\' -+�n.,-.4 G E.LMA� fc/.....:,:rf N....__I .*/#11 ;.:.*-r...j..-. - .� predicted kirks Rive nee fiver i�atershrd' CyG� A / •i»i► \\\\!! groundwater F NCR flow direction 1 N ( p iiviv:t----- ", r� _ S �1 On the basis of surface topography, shallow-level groundwater flow on the parcel is predicted to be westward, toward discharge into Limestone Creek. 7 , USDA soils mapping shows the parcel contains Nason and Tatum soils (Figure 6). These are classified as well-drained and moderately permeable, meaning they serve as a favorable sponge to soak up rainwater and feed it downward to recharge bedrock fractures. Figure 6: USDA soils mapping (Nason 62B, 62C; Tatum, 80B) •}i ... Ott -, `' `��- v 1 girt., + r FA } A kilt 468 h fiIli effi3 ' :- ... se) 11110,1:,.. v.. . • * iiiiiiiii • .-... t• i 0, * iilb .k.`, tglittlivt • «. 10 . , ,, , f- --#, .,'..., ..„,, A., ir , ,i , , ilk ,, 1,, or, ?'i..t ,. .;Li,I .I '1. g.. / .. 4r •"a' Casing lengths are a good indicator of the thickness of the soil and saprolite "sponge". The average length of casing reported for the 11 nearby domestic wells in the County database is 43 feet. This represents a significant volume for potential groundwater storage on the parcel. At deeper levels, below the soil-sparolite "sponge", groundwater in bedrock fracture networks on the parcel would potentially receive recharge from off-site, including possible connection with the highly productive fractured rock aquifer associated with the Mountain Run fault zone. Overall natural flow at deeper levels is likely southwestward, driven by a regional gradient toward discharge into the Rivanna River (2.5 miles southwest of the site). 8 Water budget estimate It is instructive to review the proposed use of water relative to the amount of water available to the site from natural recharge. Annual regional precipitation: 44 inches Conservative estimate for the percentage of precipitation contributing to groundwater recharge, subtracting runoff and evapotranspiration: 15% Annual regional groundwater recharge: 6.6 inches Average regional daily groundwater recharge: .0181 inches = .0015 feet Daily recharge per acre: .0015 feet X 43560 square feet per acre = 65.6 cubic feet recharge per acre Gallons recharge per day per acre: 65.6 cubic feet X 7.48 gallons per cubic foot = 491 gallons per day per acre Gallons per day recharge on parcel: 491 gallons per acre X 12.486 acres = 6131 gallons per day Gallons per day recharge to the parcel from off-site up-drainage lands: 0 Predicted maximum daily groundwater withdrawal on site: 800 gallons. These numbers indicate that the proposed net use of groundwater is substantially less than naturally occurring recharge on the parcel. A significant portion of the groundwater withdrawn will be returned to the ground on site via the drainfield. Potential for proposed use to affect existing users of groundwater The proposed use of groundwater is unlikely to affect existing nearby domestic wells because 1) the proposed use is very modest relative to available on-site recharge; and 2) the site is separated from nearby existing users of groundwater by a drainage divide. Significant quantities of groundwater are being withdrawn at the Keswick Hall community well field, about 1500 feet northwest of the site. It is very unlikely there will be interference between these wells and a future well on TMP 94-39 because 1) the proposed use is very modest relative to available on-site recharge and 2) dominant recharge feeding the Keswick wells is predicted to be from the northeast, away from the parcel under study. 9 Contaminant threats There are four documented petroleum releases on the current Virginia DEQ database within 2000 feet of the parcel (Figure 7). Each of these is listed as a "closed case", meaning remediation no further action is required. None poses a threat to TMP 94-39. Figure 7: Contamination threats in the vicinity of TMP 94-39 201? 513v TMP 94-39 A \. petroleum release A listed on Virginia DEQ database as of 03-28-2017 0a3601 Further•�312r?�B 198911a 111 A . . 616 scale: 1000 feet N 10 Reserve wellfield The parcel is sufficiently large that there would be room to site a replacement well in the event of failure of the primary well. Groundwater management plan Implement runoff-neutral development to the extent possible. Attachment: Site Plan 95-39 SP (2.6.17).PDF II Submitted by Nicholas H. Evans, CPG # 2801 001041 1 March 31, 2017 DEPARTMENT OF PROFESSIONAL AND OCCUPATIONAL REGULATION COMMONWEALTH OF VIRGINIA ExPIRES OA 81048ER 06-31 2017 9960 tAxylond Di Suit*400 RwAmond VA 23233 2801001 041 Telvotione (84341 387 8300 BOARD FOR PROFESSIONAL SOIL SCIENTISTS,WET LAND PROFESSIONALS 8.GEOLOGISTS CERTIFIED PROFESSIONAL GEOLOGIST NICHOLAS H EVANS 4609 BURNLEY STATION ROAD BARBOURSVILLE VA 22923 • ) r 12