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28105 STORMWATER DRAINAGE REPORT
. BOWSTF1NG CALCULATIONS UA7E = 6/ 17/yb DESIGNER = F: W MCMULKIIV BASIN 4r9&u~E=*`~°~~ ' F'ROJECT NAME = ADAMS COURl' 30~1C~ I.ANE DESCF T F'T I ON = Sl"OFiMWAI"ER DRA I NFiGE ' t t Intensity Qdev. Vin Vout Storage (min. ) (sec. ) (in./hr. ) ic.f.s. ) (cLt. ft. ) (cu. ft. ) (cu, ft. ) 5.0' 3(.)0 2.00 80J 300 505 7.4 ~c 447 2.61 1.65 985 447 539 10.0 600 2.24 1.41 1061 600 461 15.0 900 , .1. 77 1.12 1 173 900 273 Z 0• 1200 1.45 • 91 1235 1 20V Z, 5 2J • 0 1500 1.21 .76 1259 1500 - 241 30. cl 1800 1. 04 .66 1279 1sCio . -521 1 c " . O ~ 1 c~C~ .91 .57 1 291 2100 --8C~9 ' 40. . 0 2400 .82 .52 1 318 21 4C►0 -1 082 45.0 2700 .74 " .47 1330 2700 -1370 50. C) 3000 .68 .43 1350 3000 -1 b '5 O 55.0 3300 .64 .40 1 392 33Gc:) -1908 60. C) 3600 ; .61 .38 1442 3600 --2158 6 1%5 . C) 3900 .60 .37 1 519 : 900 -2381 70. 0 4200 .58 .31 7 1590 4200 -26 1 C) ' 75.0 4500 .56 .35 1627 4500 "'.i 573 EIC). 0 4300 . 5ZI-34 • . 3:3 1653 4800 -3147 , 1 8 0 ~ . 5 100 .52 .32 1704 5100 -33-96 90.C1 5400 . 50 .32 1749 5400 -3651 ' . . 95. t) 5700 .49 .31 1806 5700 -3,894 100.0 6(-')(-.)C) .48 .3o 1860 6000 -4140 1'HE MAX I MUM STORAGE ! S 538. 52834= 856 CU. FT. ~k The t i me of eoncentrati on i s 7.448573 mi nutes. The Ui;devel oped f 1 ow out i a 1 c. f. s. ,~ov,b~2. $a~re1 Drywe~l ~ TEN YEAR STORM CALC , . i RATIONAL FORMULA HYDFOLOGY DATE _ 5/10/96 DESIGNER = C SIMPSON BASIN CURH CUT 2+00 ' PROJECT NAME = ADAMS COURT DESCRIPTION = 12TH AVE INTO POND ' SUPAREA 1=. 043 ACFcES SUPAFtEA 1 RUNOFF COEFF I C I ENT = .9 TOTAL AREA =.043 ACFES COMFOSITE RUNOFF COEFFICIENT =.9 OVERLAND FLOW VALUES ' -Ct _ .15 ' L 20 N = .016 S • _ .02 . ~ CHANNEL FLOW VALUES ; , ' L _ 95 . ! . Z 1 .178 ' Z2 = 20 : I : N =.016 t P = 4 • ; . S- _ .006 ! TD . 11 . : ' ~ COMPUTED VALUES ; • • DUR = 5.00 ~ I10 = 3.18 010 = .12 ~ • QA = ..12 ; ~ . • . __...~_.._~_,,,,.~...,•un,wv,:enuaru.r..aanr~e.1LL_i1"IL.S:S.Yii~i3li~C79f.tI:L.'~f . . • y!: _ y._.._ 1 . RATIONAL FOFMULA HYDROLOGY DATE = 5/10/96 . DESIGNEk = C SIMPSON bH5IN 12TH CURb CUT 2+90 PROJECT NAME ADAMS COURT . ' DESCRIFTION = 12TH AVE INTO POND ' . SUBAREA 1=.07 ACRES SUHAREA 1 RUNOFF COEFFICIENT =.9 TOTAL AFEA =•.07 ACRES COMPOSITE RUNOFF COEFFICIENT =.9 OVERLAND FLOW VALUES Ct = .15 L - 20 N - .016 S = .02 CHANNEL FLOW VALUES L = 1 55 Z1 = .178 Z2 = 40 N = .016 H = C ~ S = .013 , . . TD = .088 . . . . . • . ' j COMPUTED VALUES : DUR - 5.00 I10 - 3.18 - ' 010 - .20 ~ C!A = .20 • , . ' • ~ , ' . C9 ' A a cA,~, S I ~ o/g'r" _..__.._.C~.r L C) ar..~.~.._..~~ 7Z..+ - - - - - - ~ ( ~ c-~ ~t~,.l_p„~ s ~ • J8 I __Q O J ~ Q 8 7 ZQS /O•4~, • - _ ~ - - ~ ~n • ~ ~r, ► ~ ~ 01' -_rO c•Q__~ c. ~-.t - - - -S ~_v~~ . ~ . . _ . ' ~ ~ . ..__...__...._,_~_._..__.._...._.~.___.~.._._.~____e__ ~w---.____._._. - . - ; - o. :-o . 0 . . . . - ~ 9--'Ce F-! q Q r. f~.. I. b ~ c.< e~ I_n.~ .s__ ..1 O~'_. _L~r►?~c,va.~~_r.' . . . Q~/ ~o•..o__~-____.~:__w.. _LL.__~._..__.__ r ~ 0. ?-~Q-._U4-~__= . . - - ~ ~~~.r, - S_I_L=!.!.._Q .r2,.. ..__7 (r_,d e.-~-)~--------:_~~..,_2_+ ~ 5----'!'. Z. 4- 90-- - - ~ ' V • _._~-_------._._~_...~..a~..____.~.~►_C.~..~M 5~.~ .o~r'~ ~ 5 ~1.~.~L 9 ~ __a. • - y.... ~ e1':Y_~~ti.in. w_~!rP_~.~ .C_..__....o.~~h. v_ ~ ~a • . _ __.--_._.._r a ±_Y4-_ ~.~_._.d_.9._S x ? Q~.__ ~._~_g_~ ~7' Z ' ~ • 73 ~ . ~ ~ _ ~~.-~-b.____.~.,.~ . ~Q_o_ . ._~o__..._~__~.~..._n_...Y , ~ . . . _tQY.1^n_Ls/.,l.~,.~E.c_-~~/~... -na-`(- - - r 1 - - _ e.._._ ~ _ W __r . - - • - ~ - _ _ _ ~ . _ . . . _ _ . _ ~ _ ~ ~ _ ____._w _ _ . _ , _ _ , I l - _ _ _ w._ .r., ~ ~ • . _ _ ..r . - • _ . _ _aw _ - - _ _ _ . : _ . . _ _ _ . _ ~ - . , - - . . . . _ C . _ - • - _ . _ - - - __v_.__ . . .a__. ~ ~ _...r ~ _ _ ~ • - ,F.._ _ i i ~ ! - - - - , .__.o........_~...o. ~m . . ~_..r~~ _ ' - ° - . - --w.... -r.. . ~.,....._.._..,_._..__...~...r~,___.~ _ I ~ ' - P o sac ~ v t o o v. o lo w_ . , ~ 016 - 5 6 4a 6 3 ~ o 0 o Z 5:t~, 'toZAL ~ , Z ; . . . QAvT_ ' ~ GRPVEL . Vd q r,r eh 'Y-vac~ 636.0 ; . ~ - - . A- ~RA s s z- 5 ~-~-3 ~ 6 - 3 .4 S,b N o ~ 1.40 ~ z _.3 ~.l ~ 1. AV~1 N ~ - - - - , . ; • , _ _ _ . _ . . w...__---- - - - . g.,,~of ~ -~low;~9 o~'fs►te. -fo~:~__.Io_-_y_~~r_._s-t4r_,~~__Q-~o-~.1_._~~_~~~ i 1 . ~!A_1_41n.~__~-C - - - - r - - ~ , 0 3 "c FS ~ . . Z; ; Z ~ _ s _ _ - ~ RATI OIVAL FUR{hULA HYDROLOGY DATC = fa/ 14 / 96 ` DESI GIVER = h; W MCIhULHz I N BAS I N OlVS I"f E+STFEETS F'ROJECT tVAIhE = ADAMS COIJF~'T DESCRI F'T I OR! = F'OST DEVELUF'MEIVT SUDAREA 1=. 84 ACRE,ra SUBAREA 1 RUNOFF LOEFF I C I ENT = .15 SUPAFCFi . =.23 ACr'ES - SUBAFiEA RUNOFF COCF'F I C I ENT = .55 , SUBAREA 3=.08 ACRC5 5UBAFEA 3 RUNOFF COEFF I C I ENT = .9 1"OTAL AREA = 1.15 ACRES . CO{"IPU5 I-fE RUNOFF COEFF I C I ENT = . c8217,:>91.:}U43 CIVEFLA{VD FLCIW VaLUES ' ' Ct - .15 . L = L48 N - .1 5 = .02 CHANhaEL FLClW VF;LUES L = C) . TD = 0 GOMF'UTED VALUCS • DUR 5.00 I1c) 3.18 010 = 1. 03 CA C). G0 , SCALE I" = 50' . . . Y, ~ . . _ , . . . , . : . _ ; . . . ' °,05~ 2~~ , • . . . . . i r I . • . . . .i " ' - .:.f~ ;v+'~ . ~ . ( --q~ "N , • ~ ' : ~ ~{0' UT1lITT~~1ief1ENT ~ . ~ • + _ c'.,.;,,:-+ + ' ~ II~ SoitoeR E~GEM¢HT - _ . . ( ~ ~ ~ .13. ' ~ ~ • ' ~ ~ ~ ~ ~ 2ob4,36 ~ ~p ~ ~ • ' • se.o2 , . ~s.oo 141.71'~ Sin9leSarre IDrTc,eU ; ~ ~ ~i' ' ~ • _ ' y . , - . ~ ~ . . ~ : . ; . `77 ~•$UIlD1~IG_ SST,i/~GK'~ , - , • _ ; . ; . ~ ~ D r,.,r►a9e. Pond ' ~ ~ . . ~ _ . . ~ . . ti. , N: -1 •2 _ . . . . - ~ ` . . . . , N !l -4r4l 53 , m . . _ . . ~ ~ ~ R=20.00 N . Z L= 2t.92 / ~a W Tc t2~21 ~ Q / ~ C ~ ~ Pc~cem n4- ~ urb ~ , , > ~ . , . . . . . •I 7- unurr 0 ~ ~t~,P~ . L1,p►i . ~ ~ _ ~ Ln _ ~raac►c . i . 4 I ~ ♦ ~ p . ~ . G0 Curb Cu N JOYCE 86.00 ~ T - 68.00 LANE r ul l°Wide Curb + . r O I D , A Wj,' tmUT1' KMENT ~ . ~ . . N p ♦ • I r \j i,~ ~U7ILtTT / ORAI ' , . _ 7~~ ~ • (O W ~ss [AtmMEIfT / 0bA' CAfL•1'S~[HT y _ / . F- I ~~l~ • . , . ~ ~ ~ y~ ~ . N ~ b ~=62415~~,~~ jr~ouble8arrel ~ i~ I tASCM ~ ` ~ ~ r Well TYpe e M L=~92 00 0 T = It .21 '9) W/Mc~al . . . . . I ~ Or T e. 4 SpoKsne C u ahdard ~ ` . dU1LD1M6 LETP1ICK YP ~ ~ . T.p eFZrn.~c ~ ~ Bo~~o►n.~ Er~v.~bsa ~ • UTILITY • [NT • • • ' ~ ~ i • ; ~ 67.98 u0.c 8.8! Auurs r'~ . 141.'S8 , ~7,46 •i - ~ - ~13.75 ' i~~i . PI►n.1~ S~ ~ nE - . . . . . . , . . ^ ADAMS RD. i ~ - Ada.w~s Co~r.t . _ . . ~3Z2.o . ~ra~ha9 e. C~~c%.,1a~~ohs .6 1~ 196 . .~re - DeVelop ft pCov\dit.~o" ~ , ~ A~EA ? ~34Z-` 348~ ) z t 1°I,OL~ ~-t.2 _ ti 2.1~. Ac.gE , . f~ PAVI. ' z (01600 D.16 Acf-ti - - . p` G~AvE~. ~Z-tN .Pve.~ue (~o'..~ (33i ) Z 33 Zo . ~ Ac~Qv~nS_ g.~.- - C►o') C3Z8') 32~ ~ . . . W ~lrre.v~ ~d • ~2p'~ ~3~,~~ ~ Z ~0 560 _ . . . . . _ ~r . . 13 ,16 o FZ ? 0.3 o A c.~E . . . ' . )(-36tg~- 20~ z 99,056 FZ.~ ti.2.Zl A~~~ ~kowiK9 o~isite. iDr lo- j2q1P .StOryv~ 1 ('~►o z. Z.ZI c~s _ . ; - ~ ~ - ~ ~ ~ . . _ _ . _ . . . ~ _ . _ . . . . . ► ~ ~ ~ - - ~ . ~ , . _ . . , ~ . F . . . . . . _ _ . . . . : . . _ . _ . ' . ' . ' - RAT I fJIVAL FC1R1`1ULA NYDROLCIGY DATE = b/ 14/ 9b DLS I GhJER = K, W MCMULk: T N BF,S I N L1NS I TE+STREETS F'F;OJECT NAME = ADAMS COURT DESCRI PT I ON = F'RE--DEVELOF'MEIVT SUBAREA 1=2.27 AChCS SUBAREA 1 F:UNGFF CQLFF I C I ENT = .3 SUBAREA 2 _.3 ACRES SUBAREA 2 RUNOFF COEFF I C T ENT = .55 SUBAREA 3 16 ACFES SUBAREA = hUNUI= F COEFF T C I ENT = .9 TOTAL AREA = 2.73 AC:FiES COM1='0SI'TE RUNOF N COEFF I C I ENT = .362637362637 QVERLaIVD FLOW VALUES , ' Ct = .15 L = 4;C) N - .3 ' S = . c:11 5 CHANNEL FLUW VALUES L = C) : TD = G C;Oh1F'UTED VALUES DUR = 1 U. C)~ I I~~ 2.24 ' 010 = 2.21 `4 . OA u. OU , , GRAPHIC SCALE f IN FEET1 NORTH ~ 0 25 50 100 ~ , I" = 50' 286.54 . . . . . , j . I . . _ i ' . ~ ~ ~ • ~ / . ~ I ~ 6 ~ ~ ~69~'--- • - ~ - - • i ~ s. ' , - a cc. Q ~ X2p~76 / co ~ ' ~ ~ cm i , / / , ~ ~ ~ f ° { Z ~ ~ 1 ~ I W ~ cr h ~ ~ - ~ ~ • ~ Q ~ .A Q ~ ~ i ~ Q ~ 251 30' i . , ,,Z~ / ~ / ~ i i ; ~0"/ ,012.04 Zoi~}.2 ~2o'lO.l 246.63- ~ \ X ~ ~ a , . . N ~ o G r o.v e.l - j ------------M -------------~~-------------------7--------------y------~' ' ' , 2p.36 ~-~dge o~E..-Ex►st~h~ 2o?2.5C~, Qo.vement-~ o.~ ~ Zo'l5.1► ~ f 12 TH ~ AVENUE LEGEND ~ ADAMS COURT X 2o61 .9G - SPot ~levat~ch : DRAINAGE MAP: PRE-DEVELOPMENT , Con+o~)r S' NP909NARG ENGINE ROAD'NC.. 1 ~ y = F 1 ow SPOK ANE, WASH. 99212 - _ . ' PHONE 926-1322 ~ _ ~ramo.9e '50.sin goti hdary . , ' ' Stormwater Drainage Report: Adams Court 1 III. ROADWAY SURFACING DESIGN: The Spokane County Alternative Pavement Design (Interim) for Local Access Pavement Structures was used for design of the roadway surfacing. ' From the table, Local Access Pavement Structures, the following information is needed to determine the required surfacing depths. 1) The type of street must.be local access. 2) Soil type (as classified by the United Soil Classification System) 3) The average daily traffic, ADT Street TWe: 12th Avenue is designated as local access (residential). Soil T Joyce Lane is designated as local access (private -road). , , ~e: In accordance with "Soil Survey, Spokane County, Washington" by United States Department of Agriculture, Soil Conservation Service, 1968, the soil found at the site is categorized as: GmB, Gamson very gravelly loam, similar to Gamson gravelly loam, except that the surface layer is very gravelly. The Unified Soil Classification System classifies the soil as: GM, silty gravels, gravel-sand-silt mixture. (See S.C.S. soils map i.ncluded) ' . Averaize Dailv Traffic, ADT: ' To be conservative, an ADT count of 600+ is assumed for 12th Avenue. An ADT count of 0- 200 is assumed for the private road cul-de-sac, Joyce Lane. ' Desiizn: . From the table, 2 inches of asphalt concrete pavement over 8 inches of crushed surfacing is required for 12th Avenue widening. ' From the table, 2 inches of asphalt concrete pavement over 6 inches of crushed surfacing is planned for Joyce Lane. . ' , i . ~ ' - • . . ' i : . i I. . , " . - - . ; LOCAL ACCESS PAVEMENT STRUCTURES ~ - ~ - . ' AVERAGE DAILY TRAFFIC SOIL TYPE 0- 200 ' 200-600 C60.0.+) GW 211/6" • 214/611 2"/6" ~ GP 211/61' 217711 211/7" GM 211/6" 2~~17" (-2"/89 , . GC 201R10 210/811 3'76" SW , 2'1/g0' 211/71' 211/710 SP 217611 2111711 21781' SM 211/71' 2178" 311/6" SC Pavement Design ML 31116" 3118" 4"16" ~ CL Pavement Design OL 4~1/7" 511n1' 5'1/811 . MH Pavement Design , , . ~ OH Pavement Design PT Pavement Design ' 1 Soil t e is classifed b the Unifed Soil ) yp y Classification System. ~ 2} Required thickness is given as inches of asphalt concrete pavement over ~ inches of crushed surfacing.- ~ SPOKANE COUNTY ALTERNATE PAVEMENT DESIGN : (INTERIM) ~ . ' - ~ ~ I 1 ` , y'✓ ' ' ( 3Z~ o rn s Co-~~r`-~ - Cs •~,r.• . 1~. ~ u e.1~ u G ~r-~ -t 4( Z 3/ 9 e " . -t'on Cvr b . C-Ci7~Gdfc/I E P C)t ' - ; o o /-5j u, ~ Z-O. c~ ~ C~r- 4- E(e-ufE. p- Ef ev., C D + t2:3 , Zo?O. 9 E, , . 71.0L fz.5 ~ ; 7►, (5 . -7f.'7o.-?cr 70.95 K)-0 711.43 -7 1,09 -7 1.Z~5 70.-Ic 7o.91. ic.o8 (o.Z S ~1 7 0 l• ~8 7.t- 38 70.80 -71•ob, Il•1G 1_t-&4 71.4-4r ~ ~(•38 7f-58 7(•o0 7(.20. 7_1,-3~ (O•4- 7Z.oG 7 S ? I- 57 ~ l. ? 8 -1 ► 5 7 f-`<> S-G lo. 3 7Z. l~ ~ ~ lt•%:. -7 1-G8 71•88 71 -3o 7(•5o 7I-UG (0.4 lz.28 -1 l. `I l• 86 1 Z.vS `l 50 7 I•?O ~ 7(•8G 10.4 ~l- SO -l2. Z0 8 ~ 2.-0Z 72-ZZ -7 ( - (~og- -7( - 84 1~. U i Io• 2.. 7Z -C~8 S e6v ~ Z . ~ S . -+7s 7z_~--0 .?z. ~6 7Z.~ s -7Z.Z~ .9-s Io.~ _ 7 ? aa 4' ~S~J~~ ~ 7z.w'~1 U ._.7.3. f € ~~.a~~Z.gk , . ~z-G 9 _72. 91 72-3 ( 72.53 7Z.&5 (0,( -r z 17 7. 'a .-73.07 73 , z7 7Z• C'9 72--89 7?.n, (U.Z. 7?.~ I fsa ~ 73,9s: ~ T3•75 73-3'7 73-95 .73.S7 .??-7A- td.z.. `l~-c~ ~3. C?, -t 3,9 4 74-. c 4 "l 3. s~ 73. 7(:~) 13.9( lo. 6 79-. 3 c Y?`~ ~ ?4-t~ l~,• S 74• S~3 lS~ f f ~ ~ ''1 c0 • ~ lfl ~ ~l- L^ r ( d ~~r ni M v I C!` M M d+ L~ L o 0 ~ L aJ J .i• ~ ~`f" W Li LLJ 0 T ; - t 1" ~i . ~ ~ ~ ~ _ NUMBER 16 ~ TY WASHINGTON HEET ° . ANE COUN , ~ SPOK ~ ~~.,~.,~-a „ . . R.44 E.~ R_45 E,_ ~ , a, . ~ .y _ f~, A ..~r~ ,i . • L L fl t i ~ t~ ~ ~ t~ ~ \ ' 1 fl e~ U7 ~'=rr- ~ a i ~t •"~~7'. ~ . 7 ~'1 ,Y~',=: i t, ;~r.~~p, , (1o~ns s e ) _ ~ c , ~ • •a r 1 ~ f• " - M : i i . ,•r '9 ~ i ~ ~'1 ~ ~ P~ ~ ' ~ • t u ~ ~{v ,i' '.il~'v"'~'+~:r~.~ . .i 4 , ,1..~ . M ~'a~: 'L ~'~1• 1 'A ~i ~ ~ ~ ~ .i~.. 1 1 4.i~ .i,...Yr.~~ t ' . , . ~ . ~B .1 ~ - - - _i~: ~~r~.~ - . ~ ~~m j~~° ~.1' ' ~IND , ir ~ ik ~:A 1 ~'.i: ' ' ~ ~ ' 'S7~'AUL'. ~ . ~ , ~ y... :t `;!'r` 'i. ~ ~ L ~~~C`i.' `•~'r.`."~~ 1 ~ ~ • - ; . , ; ~ : r . . ~ y ~ ; ~ . • . ; c , ~ , . . . ~ . , ry}~.,. . . 76 ~ 1 ~ t . t KEE~ ~ 1 ' {1b ~17i'~+w:~~ .r a~.x . ~r~. ':R rr t•,~ ' : w^:.s- :d • . 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BhD , loins sheef 85) - . ~ ( . s, -,~T,x~,~e,a, . . . ~ ~ i . i ! ~ soiL su~vEY F ~ ~ 74 . ~ ; SPOKANE COUNTY~ tiVASHINCTON TA1~LE G.-l~rie dcscri ~tions o suils a~rad tli . 75 ~ 1 ~ e2r esdimatecl pl~yszcal an,cl cliem~cal ro cr~ies- 1~ p Conlinued Cl«.~,Sification ~ ~ Cl;►.~sificntion-Contiiiurd Pcrccntn c ~.~i ' D p~l 6 P ng sic~ c. ~1fnp Soil nainc Description of soil nnd sitc from . Arnilnblc d s~~mbol ~ surfuce T Permcnbili~y ~t~A~~~ Renction 'c . . • U~DA I,cxturc No. 4 I~a 10 I~o. ?00 n~.Persion Sl~rink-st >n Slirink-swcll potcntinl , ~ ~ Uuificd AASIiO (4.7 mm.) (2.0 mm. p,p cnpncit,y (1:5 dilution) pot~~nti~ ) ( 79 mm.) Ix. DsC- llragoon stony silt loaro, 0 to 30 pcrcciit Similar to Dragoon silt loam, 0 to 30 pcrccnt ln. prr br,, Jn, ~r i~ o slo ca. slopcs, except thnt the surfnce layer is stony. p'' f d0j~ p~~ P . DsD • llrngoon atony silt loam, 30.10 55 pcr- ' ' . - . . . . . _ _ _ . cent slo s. • . . . . . . . : P~ DvD llrngoon very rocky complcx, 20 to 55 1)ragoon pnrt similar to Dragoon silt loam, 0 to . pE:rcent slopcs. 3U percent slopes, escept thnt depth to bcd- rock ranges from !0 to 'l0 inclics. Rock oiit- crop included in tliis complex. , Fk8 ~loikn silt loncn, 0 to ?0 pcrcent slopcs. ~Iedium-tcxturc~l, ~scll-drained soil fortned from U to 2~3 Silt loum_ ~fIr L ' lac~al till contsin~u * a lar c nmount of vol• • 85 to 95 80 to ~35 60 to i0 0. - B b B ~ 8 to ~ 5 0. ] r to 0. 2U 6. 1 to G. 5 Hi h__ cnnic nsh in the surfa~ce ln~cr; underlnin by .,4 to 44 Grn~clly lontn.______ _ B.-__. Lo«• to m Low to mod- cratc. gravel nt dc tli of 30 to GU inches; occupics 44 to 5;i Vcr ~ rn~•ell snnd SAI_______. A-4.._.._ ~5 to 8~ 90 to 80 35 to 50 0. 8 t , crate. ~ J s Y Y o_. a 0. l2 to 0.14 G. i to G. G]l~ Th------- J. ~ tuidulnting, mor~unclikc topogrnpht•. louu~. . b o. - - Low. 53 to fi0 Grn~~cl-•----------- • ~~I...----- A-2_-•--- 30 to GO 20 to SQ ,5 to l;i 5. 0 • GP-------- A-l.._--- ?;i to 35 10 ~ to l0. II ,0. Ob to 0. U~ G. 1 to 7. 3 I~f i h_.. I,on• ~ to_U Uto5 ~10 O.U4ioU.UG g ' - - I,ow. EIC ~loikn ver aton silt loam, 0 ta 30 per- Similnr to rloik;►silt lunm, 0 to 20 pcrcent slopes, . G. G to 7. 3 ll i~h..__. Lo«~. Y Y ccnt slopcs. czccpt thut thcy nrc vcry stony t•l~roughout. , - - l.ow. E10 Lloika ~~er ston • silt lonm, 30 to 5~ ~ Y J pcrcciit slones. Em ' Lmdcntsiltloam. Dledium-textured, some~vhnt poorly drnined, Olo2G SiltloAm_____.__.._ ~ji,_ i a l k n l i n e s o i l f o r m e d m a l l u~•~ u m f r o m c n l c n r- C~---- ~ 1 5 t o 1 0 0 ~ 0 t o 1 0 0 9 0 t o 9;i 0. ~ ~ 8 t 0 ~ D. l( t 0 2 ~ 7. s l 0 ~ ~ jl ~ ~l_ c o u s s i l t, o l c n n i c a s h, n n d d i n t o n i t c; d e p t h ° 6 t o 4 1 1' c r v fi u c sn n d y 6---._. L o~~• t o m ~ to ~~•at~cr table fluctuztt~s from ncar t~hc surface lonm. ~IG_._._._. A-4.____. 95 to lU0 90 to ]00 GU to i0 U. S - ernie. • ~ • ~ , . t o ~ 0, I~ t o 0. ? 0 7. 4 t o 8. 4 A fo dcru tc___ L n• Lotr to mod- craic. t ~ o a b o u t 6 f c c t. 9 1 t o G O S n n d d,~ y l o n m. o. A- G___._. 9 5 t. o 1 0 0 9 0 t o 9,; S ~ t. o 9 0 0. 2 to 0. 8 - ~ Low. . r1~ 0.]ito0._0 G.Gto7.3 1.o~r___.___ llodcrnt.c, Fa6 Frccman silt lonm, 5 to 20 pcrccn~ 1'cry decp, modc n ~l} ~•cll drAincd upland soils 0 to 22 Silt lonm___________ ~IL- Modcrnt.c. s1o , ~+~ith medium-tesGurcd surfuce la ~er nnd medi- CJ~---- 9;i to l00 90 to 100 80 to 90 U. ? ~ ~ } . la 0. S 0. l7 l0 0. 20 G. G i~o 7. 3 Alodcralc_ L n• . . FaB3 I~rcemnn silt loam, 5 to _0 pcrcent umor modcralch fine Ic~tured sub..oil, formcd io i_ Silty clay loam._.__. CL o to mc Low to mod- slo , sc~•ercl eroded. from silt. oi~ rolling to hilly u}~luuds. A-~------ to IQO 90 l.o ]00~ SO to 90 ~ p, p;, - ~ _ cr;~te. I~ Y < 0. l r to Q. .,0 G. G ta 3 I,o~c----- r FaC3 Frcc~nau silt loa~n, 20 to 30 pcrcenl. R1o Icraic, cntc. A1odcratc. slopcs, scvcrclv craded. Fm Tresh ~~•atrr ~narsh. ~h;illo~~•, sa•am n•, intc~rn~illcut }~onds nnd fringcs nroun ~lakes th:it, htn•e a fluctu,iting «~~tcr t.~b1c. E►~gincerinF dat~ is not gi~•en, . AS I1111d t~)~pe is t~ao ~~uri~ble. , GaC3 Gur6dd silty clny lozim, 0 to 30 percent 1'er~~ dcep, ~sell-drnined soil de~~cloped in loess 0 to f Silty clnp lonm..____ , ~ lo s se~•crel ~ croded. on rid rto s nnd knobs on tlie rolliu to hill • b to 23 Silt ~ cln CI'-------- A-~------ to l00 h0 t~o l0U 90 to 95 0 s pc , ~ K, P , 6 , J , Clf---.. ~ . 2 tA O.~~i ' 0, 1 i l0 0. lG G, G to i. 3 Lo~v uplnnds in ~l~c Pi~lousc ~oil nrc,~. • ..3 to GO Sil~y cln~• lo:►m__..._ A-7---.-- 95 to 100 .lU to 100 90 to 95 0. 05 to (1. 2 1~lodcrAtc. _ AlodcrAtc. C~.-----._ ~-G-----• 9g to 100 4J0 to l0U 40 to r ~ . 14 t.U 0. l"/ 6. G to i. 3 Loti~•------- lii ~h. 9,, U.2 to _.5 0.)7toU.2p G.Gto7. 6 GgA Gnrrison gravelly loam, 0 t~o 5 percci~t Cru~•c:lly, mcdiu~n-t~extauccl, sotne~rliat cxces- 0 to 15 Grn~~clly lonm_ . _ 3 Lon~. I1~odcrnte. _ lii6h. _ Alodcrnte. S1I-------. A-g------ g~ t~o 85 40 t.o RO 35 t~o 50 (1. ' o slopes. si~•cly dr~ined soils far~ricd in gri►~~clly gliicinl ]5 to 94 1~cr~• gr:it~clly lonm._ ~~~t ~ S to 2, 5 0• l. to 0. 14 G . G B Gnrrison r;i~•cll ~ lonm, 5 to ?0 pcrcci~t out~~~nsh mntcrial from <~nriet~• of nci~, 94 to GO Snnd, grn~~cl, und A ~ 6~ 3Q t4 GO 510 l5 2. ~ to r,, 0 E • ~ 14 7• 3 A1odcrate Lou. _ Low. g ~ y Gr- A-1.----- 25 t~o 3y 10 to ?lI ~ ( S 1.0 0. 10 G. G to 7. 3?11odcrutc... Low slopes. iRucous pnrcut rock; on ~►ciu•ly le~~el to mod- cobblcstones. 0 to a ~14 0. 0~ tu U, UG G. G t ' cr:il~ly ~lo~~ing tcrr:~c~s; dcpth to n►iat,urc of U 7. 3 lligli------- Lo~~~. _ J.ow. _ Low. snnd, fir;~rel, nnd cobblcstonc~s rnugcs from , 2;~ t~o 5 fcet. ~ Gm6 Garrison ~~u~~ ~;rn~~cll~• lovn, 0 to S Simil:~r ~o Cnrrison grnrcUy~ 1o~m, csccpt that 0 to 15 1'cr~~ gr~n~elly lo:un_. ~ ~ ~ crccut slo es. tlic siuf:ice la •er is ~~er~~ r~i~~ell 1510 94 1'cr ~ ruvcll lo~m.. • i-------- A-2___.._ 30 t,o GU 20 to SO 5 t~o lb 2. 5 1A ~ ~ p A ) , s ) ~ s Y _ A_2 4~ ~ ~ ~.,0 0. OS to 0. 10 G. 1 t4 G. G D~lodci'~~t,C._ ~ . 44 to GO Sund, grnvcl, and , r ~ 3U t~ GII 5 to 15 5 to 5. 0 (1. (IS to (1, . . Lo~ti. , cobblestones. . A-~----•- ~ 3J ]0 to 20 p to 5 1 G. G to 7. 3 Afodernt.e.._ Lo~v. _ Low. _ Low. ~IU U,09t~~U.UG 6.Gtfl7.3 lli 1~ , B Loti~~, . Low, Gn6 Gnrrison very stony lo;~m, 0 to 20 Similnr to G,irrison gr~~rcll~• lo~im, escept tlint pcrccnt slopes. 11ic Eurf;~cc: ln~~cr is ~•cr~~ ston~~. , GpA Clenrose siltlouiu, O tA J ~~~rcClit&~OpCS. 1'cr~• dc~p, n~cdium-trxtured, a~~ll-druincd Foily O to 72 Sil6loam..__.._._.. ~ G B 1 nr s'I , ' 20 ~crcentslo ~es. tornicd fruiu acicl i~ucou~ locinl till• surtucc 11L'Cj~---- A-g------ b~ to 415 75 to !15 fi0 tA 85 0. p G e 0 C RI I~OA111, ~ fA ~ ~ K , 3 ta 2. 5 0. l 7 to 0.20 G.1 to 7. 3 . GpC Clcnrosc si16 loa~u 20 to 30 pc~rcc~nt Iayrr influcnced bi~ locss anc1 volcanic s~li; on niodcrntc_. Lo~ti to Loiv to ~;lopcs. ~ g~~iilly ruping ~u sli~i~~► u~i1auclr. modetnEe modcrnte. GpD Clenrosc sil~ loani, 3Q 1,0 55 p~~rr.~~ut ~ hlop~w. ~ t ' • r • R . . . . ~ . . . ' ~t' . . i . . ~ .-r" . . ~ . ~ . ~ ' • ^ . ~ . . ~v....- . . . . . . ~ . r ~ ~ 8 a-~ ~ ~ • 1107~ , ~ ' ~ "nr~o ~ " • ~ ~ ~Cb ~ ~ ►4n~ ' ~ fi , ~ / ~ t.11 >o c ~ ' - ` t ~ ~ VT fi~'' ~ 1£ ri ~a 'y~° a - ' ~ 30~ ~c - ~ 3 ~u ~ ¢.S 9$.0 I Zo ~ ~ yV ~ ~ ~ 06 N o ----t.~,,l . ~ 1~' 'r~ ~ / ^o / ~ " ' ~ ` ~ ~ N E / ~ 1 " / / o `r ~ 0 C~ ~ i . ~ ~ ~f ~ Q ~t~~, sE~' aa sp' ~ , ~ •~,p 4 4 S~ • ` , • t"~ ' S',~ , . 1 SE ZQ ' ,g~„~ ~ L~' t ~ `t ~j•` . , r ~ J ~ I " V~` ~ -~„vk5/ 8$.oc 1 o/ TU,~.~ P•5oo,`t -ta , n ' ~1•`~ Q ~ ,ZC°' ~ 50OC ~ A $Q , - ` - , ~ ~t- - p, s P ~ ~ °1 cJ ` I_ - STORMWATER DRAINAGE REPORT 1 for ' . Final Plat Adams Court 12th & Adams in the SW 1/4 of Sectioa 23, T. 25 N., R. 44 E.W.M. Spakane Couuty, Washington June 18, 1996 Repon Prepared By: Simpson Engineers, lnc. North 909 Argonns Road Spokane, WA 99212 ' PROJECT NO. 13220 The design improvements shown in this set of plans conform to ~/7Vg the applicable editions of the Spokane County standards for . road and sewer construction and Spokane County guidelines for s,.~6 W-2 stormwater management. All design deviations have been approved by the Spokane County Engineer. I approve these C-,•P~ plans for construction TABLE QF CONTENTS w McM oF wns.4y, , I. Drainage Summary y ~ Z U. *Drainage Basin Data &"208" Pond Volume Calculations *Rational Formula Hydrology & Bowstrin$ Calculations ' * 2a57s . Curb Openmg CalculaUons Cf~~ *Undevelopeci vs. Developed Offsite Drainage Calculations AL III. Attachments: ExP oA-TE ~ w4i *Roadway Surfacing Design * 12th Avenue curb grade calculation sheet * S.C.S. Soils Map and Descriptions Stonnwater DrainagelreportsU 3220 . 6118l96 ' Stormwater Drainage Report: Adams Court ' I. DRAINAGE SUMMARY: The proposed plat Adams Court is located on 12th Avenue between Adams Road and Warren Road. The plat is ' approximately 2.1 acres in size, and will be divided into seven lots. The site sloPes downhill from south to north about 1 % to 2%. The Rational and Bowstring Methods were used to calculate the peak onsite flow for the developed property, and the type and number of drywells needed for each basin based on the storage capacity of the pond. The Rational Method was also used to calculate the peak stormwater flow off the site under two property conditions; a) undeveloped, and b) developed (with houses; driveways, and grass lawn). The undeveloped property has a peak stormwater runoff of 2.21 cubic feet per second flowing offsite. If developed, the property would have a peak stormwater runoff of 1.03 cubic feet per second flowing offsite. ' Since, the developed runoff is less than the undeveloped runoff, no drainage facilities are planned to catch offsite runoff. In accordance with "Soil Survey, Spokane County, Washington", 1968, the soil is categorized as: CrmB, Garrison very gravelly loam, similar to Garrison gravelly loam, except that the surface layer is very gravelly. Figure 2, page 6-3, of the "Guidelines for Stormwater Management", by Spokane County Engineers, was used ' for rainfall intensity and duration occurring at a 10-year storm frequency. ' ' wo tio ' . wo so ~ ~ ~ ► t~w~t 5° W R EN ' . P;Phwlt - . ~,sEn~NY ~a~'~'~~ ~ a t'~ ~„c►,t• 14,~ ~ o-~ pQ 88 , , • , . , ~ ~ 68 0 2 . • , . . ' ' ' ' ' ~ . . ~ 56,t SACK ~ ~C , n,; Dt~n~rw-9~ eona ~ ~ ~ . M ~ ~ ~ ' ~Tb . 4h'`~ / • / $ ~G~ • n~ . ..~'41~~ W . ~ ~9 ~ ` ~ \ ta`c►c • . • - Z ~ ~ ~ \ ~ \g~ . ~ ~ ta~~f` • . W ~ , ~ yh ' ..--I `.'9"'~ o,~~ 4 , ~ . , . Q ~ ~ ~ / ~ / ut~lN~pt •`R~'~ + ~ . - 1 ' ' • u K w ~ y►' y''~~ lp~ Z,'k .00 'ao t rb Cv, µ 1 + -"s•' " ~Q'3p ' G { „~j y ~S E t Be„ ~ ~pNE 00°06 I Iw~h I' ~4°° tJ~'~ vt~ ~ IN „-c~-~+~t 5+~a.2;~► ~ P 3 9 ~ ~~9Y a~~~►.M E q/~„~o~~~ 952 ~ ~,.h~ ,.100, o.. M 1 ~n r ~ '~3 ~ ~ ~ i►4 ~ ~i8 / . ; ~ ,~o~Ubl~ B e , . ~I t,l p~ ~ pt, 3/ , ~ •T~'•t3p %y~ t~i, W~M~}°~ t 4Zo ~ r 1 1~ ~ IN~K ~ p f ~ . 2~' f CI , 6L_ ~}}OM ♦ I' . ~ ' _ , ~ _ . . ~ k ~ _ ~ - ~ . ~^a/ ~ n/ ~ r ~ Q ~ /YMI~. ~'i %f (1{~ J ~ • ' . p9AMS 4 ' • ~ ~ 13 2, ~O ~ . _ . . . ~ • ' - ._.r._. , ._~~.e~. . . . _nT ? ~j . _ . _ _ • - _ _ _ _ ---,._~1_v_. . ~..vi_ri. - - - - -.-1--- - - - - z.8 __O_--_ . L .E . . _ ~E 4-C~ ._~~_i i ~ ~%t- X _ 1:., - ~ ~._..__..w _ . . . C - • ~.Q..... - - - .~~1,, ~ ► .1zr~--x 5-,? S 2 .1 J.~~~ ~ ~ ~ ~U.?_•~- ~ ~f3 . . , _ . . _ . _ ~ . _ . _ _ . _ _ _ . - - _ ~ _ _ ~.d_.____.~~ ....1~~ 1_~~0 Z~ ~.s ~ ~ 4 Qcz__~f i ` . _ . _.J :~.~r_.e__~ • - ~ l~ . • x c.c~ 2. ' ...i ~ ~'.~.5~ - C~-..a.. f._.._. _ . _ - - r / , . ~ . - ~ j , ~ c~.~ r~.~,~...T..____...._. . . - - _ Ll, - - - - ~T_o. ~ ~._l_ . _ ►r.~~ -t=- .r - o ~..~.s - _ . _ . 4' ? ~ ~ . . . _ - - - - - - - ~ - . - ~F-4 ~ Q_ _~Q_.~-- - ~ . . ~ ~ .l.r t :~.3 . _ . - _ . . ~ . _ 1 - - ~=r' {.r. r,.._~: ~r ~ ~.l ~~.L~ ~ ' __1..aY.,O_ O~ ' - aa G-L'-t- + -c-r' t , - " ~1-- _ .~____w._...__ _ _ , S_? ~ hAl" I ONAL FOkMULA HYDFOLCIGY DATE _ 6/ 17/ 96 DES I GNEF; = k: W MCMULk: I IV EcASI N 12TH AVENUE NROJECT NAME = ADAMS COUC"T DESCR I F'T I ON = STDRMIrJATEh DRA I IVAGE SUEcAREA 1=. 1= AChES . SUBaREA 1 RUIVCIFF LOEFF I C I ENT = .9 TOTAL AREA = .13 ACRES COMF'OS I TE FUNOFF COEFF I C I ENT = .9 OVERLAND FLOW VALUES Ct = .15 L N = .016. S = .01 CHF;NNEL FLAW VALUES L = 280 . ' z 1 _ 4c) Z.i .172 N _ .016 R = c_i ; - , S _ .01 ; • TD = .1162 , COMFU"fED VALUES DUFt - 5.00 I 1 o - ; . 18 010 - .37 , QA - .37 . • • - , . , Ki~ ~.HL t •t - - • . ' BOWSTFING CALCULATIOIVS UATE = b/ 17/96 DES I GhIEFi = k: W MCMULk:I N . EtAS I N 12TH AVE ' F'ROJECT NAME = ADAMS COURT DESGF I F'T I ON = STOF(MWATEF: DRA I NAGE t t Ii-itensi ty Odev. VY n Vout Storage (rnin. ) (.sec. ) (in. /hr. ) (c.f.s. ) (cu. ft. ) (cu. ft. ) (cu. ft. ) 5• t:) ~c 3C~~7 ;.18 .37 150 9t) bc i 10.0 . 600 2.24 .26 184 180 4 ' 1 C~ 1.77 .21 22. c:I 8 270 -62 4C).C) 1200 .1.45 .17 221 360 -13:1 9 - .:~J. ~ ~ 1500 , . 1.21 .14 227 450 -223 = C~. 0 18C~~~ 1.04 .12 2 ~ 1 540 --09 35.0 21~~U .91 .11 234 63~a -L 96 1 . . 4C~. 0 2400 .82 .10 240 720 -480 ' 45.0 2700 .74 . 09, 243 Ei 1 o --56l 56. C~ 3000 68 .08 247 900 -653 JJ. i) 00 .64 .07 99c) --735 60. U 4600 . 61 . U7 264 10110 -816 6 5) . C) 3900 .60 . 07 279 1170 -891 7C~. G 4~GC~ . 58 .07 292 1260 -968 ' . 75. C) 45~ )0 .56 .06 299 1350 -1 051 ' @C). 0 4800 . 5 -3 . 06 3(.~4 1440 -1 13b 55.0 5 1OC) .52 .06 .2s 13 1530 - 1 i 1 7 ' 90.0 5400 .50 .06 3,22 16'' - ^ 1..98 9 5.C) 5700 .49 .06 333 171 C) -1 37 7 ' 100.0 6000 .48 .06 343 1 SGO -1457 1"NE MAX I MUM STOFAGE I S =09. 5 6812 CU. FT. ~ The ti me of concentrati on' i s 5 rni nutes. , " 5 iv~gle. Bc~rr e1 Dr y~e.l1 The Undcvel oped f l ow out i s .3 c. f. s. ..Q , TEN YEAF STORM CALC . . _ _ _ , - • _.......1._„_._ ~ _ ~ _ _ ~ - - RAl" I OIVAL FCIFMULA HYDFOLOGY ' DATE = 6117 / 96 DES I GNER = F: W MCMULF: I N BAS I N4&WPOE LHME ~ o`l c.E F'ROJECT NAME = ADAMS COURT DESCRIRTION = STORMWATEfi DFAIIVAGE SUBAREA 1=. 55 ACFiES SUBAFiEA 1 RUIVUFF COEFF I C I ENT = .9 SUBiREA 9 (iL:FiES SUBAhEF, 2 FUNOFF COEFF I C I ENT = .15 1"OTAL AFEA = 1.45 ACRES COMF'OSTTE RUfVOFF COEFFICIENT =.434482758621 qVERLAhiD FLOW VALUES Ct = .15 L = 85 IV - .4 ~ S . 01 CHANNEL FLOW VALUES , L M 288 Z1 36 Z 2 _ 4.5 IV - . 016 - B C) . S = . 009 . TD = .2U5 , CCIMF'UTED VALUES - DUF; 7.45 11 = 21. 61 Q10 = 1.65 DA = 1.64 , ' - BOWSTRING CALCULATIONS I}ATE = 6117196 DES I GNER = w: W MCMULk: x N PF,S I N 3oYcE I.ANE ' F'ROJECT NAME = ADAMS LOUFT I)ESCF I F'l" I ON = STOFihrIWATEF' DFiA I IVAGE . t t Intensity Qdev. Vin Vout Storage (min. ) (sec. )(in. /hr. ) (c.f.s. (cu, ft. ) (cu. ft. ) (cu. ft. ) 5.0 3(--)U 3. 18 2.00 BcyJ =00 505 7.4 ~K 447 ~.61 1.65 98'5 447 539 1 i),C) 600 2.24 1.41 1061 600 461 15.0 900 , .1.77 1.12 1173 900 273 20. 1.^(:)_) 1.45 .91 1235 1yC~0 5 25.0 1500 1.21 .76 1259 1500 -241 ;o , C) 1 sc:)0 1. CJq .66 1 2- 79 1800 . --521 v 2100 .91 .57 1291 2 100 -809 40.0 +400 .82 . 52 134 18 2400 -1 ci82 45.0 2700 .74 .47 13 340 2700 -1 3- 70 50.0 3000 .68 .43 1350 ~ t) Cl Cl -1 !S J G ~~.0 .64 .40 1 Y9~ L=~,pC) --19U8 -;~.~GQ JJ 60. 0 = d00 .61 0 3-8 1442 3600 --2158 65.0 3900 .60 .37 1519 3900 --2381 70 , 0 4200 . 58 . 37 1590 4200 --26I0 75.0 4500 .56 .35 1627 4500 --2873 60.0 4800 .53 Z. 1653 4800 --3147 85.0 5100 . 52 1704 5100 -,:~.~9b 90,1) 5400 .50 .32 1749 5400 -3651 , 18C 9~, C) ~700 .49 .31 ~b 57GC~ 894 100. 0 60oQ .48 .30 1860 6000 -4140 THE MA X I MUM STORAGE T~ 538.528343856 CU. FT. " The ti me of concentra-ti on i r 7.448573 mi nutes. 17ov,ble. $arrel 17r~we11 The Undevel oped 1100 oLIt i a 1 c. f. s. ' l"EN lr'CAF 5TOR1`1 CALC , RATIONAL FORMULA HYDROLOGY DATE _5/10/96 DESIGNER = C SIMPSOIV PASIN CURH CUT 2+40 . PROJECT NAME = ADAMS COURT ' . . ~ DESCRIPTION = 12TH AVE INTO ROND ' SUPAREA 1=.043 ACFcES SUBAREA 1 RUNOFF COEFFICIENT =.9 TOTAL AREA =.043 ACFES COMFOSITE RUNOFF COEFFICIEIdT*= .9 _ ' ' . . OVERLAND FLOW VALUES' -Ct = .15 ' L = 20 N = .016 S - .02 . . , ~ CHANNEL FLOW VALUES ~ L = 95 j ' Z 1 = .178 ' Z2 = 20 ~ . ! N = .016 ' P = 4 ; . S. ~ .006 ~ T D = . . 1 1 . j . . . . . COMPUTED VALUES • ' DUR = 5.00 • 110 = 3.18 • 'a . 010 = .12 . 9 QA = .12 • ~ . - • ry.-.~_.•.••---- ~ w.rsory;'ettt.~4P.•1.!wnr~.,tll._~'Y1.:L333iii3liiJ.I11',LxL3f11 . _~_a« 1• „i .c. _ -7177- ~ • ~ - i RATIONA1,. FQRMULA HYDROLpCY. DATE 5! 1 0I 96 . , ❑ES$ GNER = C SI MPS[]iV 8A5 IN 1 2TH GURB CUT 2+90 PRaJECT NAME = ADAMS COuRr - ~ DESCR I P 1` I DN = 12TM, AVE I NTO PON13 ' I aUBAREA = 1 •07 ACRES SLIBRREA' I RUNOFF CqEFF I C IENT = .9 1 OTA4 ARi...A ~ ' • Y7 ACI1ES r COM1 OSITE liL.!NOFF CO4FFICIENT .9 1 QIIERLAhlD FLUW VALUES - ~ ct _ .15 . L - 20 _ N ~ .016 s - .02 CHANNEL FLOW VALUES . . . L ~ 155 L l = .17a L2 = 44+ . N ~ s016 B 0 . ' s = .013 ~ TD ~ . 068 - . . - - . ~ CDMPUTED VALUES DUR - 5. 04 . ` I1U - 3.18 ; 014 .20 ~ - ' • C!A w .20 ~ h . * ' • . . ~ Aar-AY20 S 1 1 019.( .C _~__.__.__.W._-_-__-_ -------------~..m~._ _ _ . ~ _ _r.- --C 1~.L ~ Z~ SL~ n ~1 c r_Z .L[n c~ ` ~d L „ . S._.S , a•, _ J p ~ c.A. c.d C LIP ~ Z O S ; L- 4i3.....s~8~! ~s~~3~'' _ ~ • 8 % l3~L ~ . ~ t.ti. - L _t~ ~ ► ~ Q . ~ J ; ^ _ - - - . - - ~ - - - S. .:~...._..:~?,..t 9 o _ ; _ - - - - . _ _ . _ ~ . 4_..l_ • - - . ~ ~ _ . _ ~ o • z~ Q ~ _ _ - 1 . . 1 . ~~_~Ow_~,1[1~.__._~~_'l_~_-SI.Qn_ __~._~!_-------__._..~...._~~__.._.____.__r._ _ . - ~ ..._..~~2 ~rcr_~:.~Crc:._. . t1.YE ~?,.---G_c.~~__~e~_1 nC_= .TO!'....~~..ior►?~_c.v~.~~_r' . .M ~ _ . - Q..Q.~.L_~= ~ __.4__• o-k'___ ~ - _._.Y_- - - _r.~~i_.~..-~ Z-4-90 ~ . ` . . . . _ . _ _ . ~ W.~~-r ~-----.fi~ _W ~ ~ ) ~ ~ . . _ . . . _ _ ...Na__ ~ , ~ . _._o.~ , l . ~ ~..rs`.. ~O~.O~_7..._._._..~~..+...»~rC.:.~,-~/ •-V-~~.~~_.~~._..~~Z.w..~._~~j.~r...... 1 • -Aa ~ t _ . _ . _ . . -_~._J _ _rt_~ ~ _..__.__..~o_ _r~___ _ - • - - T . . ---.~_.___..___._____~__......__.._.,___...__._,_._----__....._._._.__y_.~ _.___w__ ~ I c _ • _ _ _ _ ~ w~._ ~ ~ i . ~ . . - _ . ~ o.:_,.~.__ ._.._~_.....~...___e.___ _ _ - - - - Ac~aV~►S _ ,co~xri _.__~~Z~~-------- . . 1 . _ , _ . , . . . . . . _ . . . . ~ . , ,Pos~ ~~.ve.loP~n,e~-} Cov. i-~~o.~, ~f~~wing .o~'-~'s►~'c~ , ~oZAL ~ _ _ _ _ _ . _ _ . ti Aa_o~w► S __g o As~__~ ~o~ ( 3 4~a' 3 ~}_s_o ~~i Z ~ _Q~9 ~._As~~ _ Q Av 1:~ . A~60.~xS . ~~Qd ~~o~~C 338~~ = 338o F1:21 . . _ . _ - - : _ V~I arr eh _gQad ~ - - ; 14\ z 3 _4 80. Vo, 1 1-9 -n-- ' ' 1.AWN . ~l o w ►.VX5 ~ ~ f S 1 e. - O Y._.__~ O y e ar _-S -t or__m-, 1 . , . _ . ...-~or_ ~ ~ S.~ .-~CV 4.~.o.Q.~nn~h.~[._ _ G.9.h ~ ~t_i~.~~..• ~~~_s ~ Q~.s-~~ia~. P 03 cFs ' . . ..n - - _ - - - - _ ~.A-• . _ . ~ . . _ . . . , _ . _._~a__.~ _ - RAT I (]NAL FOFMUL'A HYDKOLOGY . DATC = 6/ 14 / 96 DES I GIVEF = h; W MCMULk: I N NAS I N OIVS I"fE+STFEETS F'r'OJEC7 tVAME = iiDAh1S,CQIJR1" DESCC'; I F'T I ON = FOST DEVELOF'MENT , SUBAREA 1=. 84 ACRLS SUBAREA 1RUIVOFF COEI= F I C I ENT = .15 SUBAI;CA 2 23 AChks ' SUBAREA 2 f;UNOFF COEFF I C I ENT = .55 SUEcpRLA 3 08 ACI;ES SUBAhEA 3 I;UNUFF LOEFF I C I EIVT = .9 TOTAL AFiEA = 1.15 Fy` CRES COh1f='O5 T TE FFUIVQFF COEFF I C I ENT = . 2.8i 1 7J9 1 J04' OUEFLAIVD FLOW VraLUES t Ct - .15 , L = 340 N - .1 • S = . t'.) ? CHANNEL FLOW VALUES L = C) . T D = c'~ COh7F'UTED VALUCS DUR = 5.00 I 1 c) _ 3.18 . 010 - 1. 03 ~ GEA - i ► , 00 t 1 , 1 " ' ' ✓ (~1 - ' - - - - - - - - - ~I - - - - - - ~ SCALE I = 50= REN. RD. . . . . . _ ~ _ - „ ~ . . . . . ~ . . ~ l°05~5=r~~~ UTILIT'/`r~►=en~ir ~ . , . , , . . . . • 1 Y.13 . - ° , ° ~ I' sawfia -F.^r.cncwr . , _ . ; . 88.00 141-~ ~ 71 Si 9 le Sarre ( Prvocll \ ~ , . . ' ,s, ' ~ . - • ~ f Dnuro~9G P0rbd ~ ~ ~ a ~ e =6r4153 _ m - - - ~ j R- 20.00 ~to Z W L Zi.92 ~ a ~ ~ . _ T` I2~,2 I B ~ ~ ` ~ ~ ~cetn n ~ urb ~ k , y . . . . . , h•~ o ~ ~ ~F~~ . L~V++i ` • : ~ . . . ~ ~ ~ UTtUTY ~ ~A •Y •i ~ , • I ~ ~ cK . ~ suILDi►,~ ~ l.04Curb C \ ~ yA ` ~ p ~ ' uyz.o+ 88.00 JOYCE 88.00 3 , " LANE ~ T°wide Curb A 7✓UT'tUTY ENT ~ . O Sn oCGp } N ~ ' • \n~ N ~NTILITY \S [At~MEUT N~~ r CK7 m ' ~ ~ _ > . \ ' / . ~ . \ ~ \ •1 . . N ~ ~i a = ~2'4~'S3` v~ ~rY~ T~Ooubl~ 8~ I ~ N. • , . ~ ~ o .~1b[►1 / ~ ` - R= 20.00 ~ rrwo) i TYP e 8 i ~ M L = 21.92 . . . . . . ~ ~ a T = it .2I ~ W/Me+al fro.fne ~ 4 3 s - ~ 7 tuiwowc tcTwcK Typp- 4 SpoKsru C~u~r ~ananrd • ~ . s.p ei'Zr ~ tn ~f Iev~bSa 60440 . . . 4vf-- ~ • ti . ~ ^ ~ ^ - - - - UTILtTY ~.~uRC„~88.00 Au ~s ARu ~ ~ '141.'S8 -2T ,~•a. . . ~ ~ o ~ Mcur 348~~ • , , Zo7J,75 • E I~~i a ',!Y~'~' ADAMS . RD. ~ _ , ~ . v e. Il4 (q<o .Qre- D.eve.~o~pv~er~ . Coy., d,%-~io~.. , . ACzEA oT ? (342~)( 348') z 1 lq 1O16 F'f.Z Ac-?-E-- A PPV~ . 12t~ ~vehv~~ 00')(34z: ) z 342.0 Ado~hnS d. (1u' )~338~ } z 33 $ o - . o. , r G~AV~L ~Z~H AVe.Nu~e. ~~D } ~332 ) Z 33 ?o . . _ _ _ . AaQ~S ~a. ~,0~~~328') = 32so . . . ' V~I 0.r r ev. ~ d• 2 2~ Z . . ~ ( ~(3 ~ ) 6560 . . . . ~ . 13,16 o F~? 0.30 Ac.~E : r 6►RASS ~ ~ 4'L - Zo -2p )C348 ~ Zo~_ z-- 9q 105_4 fZ~ ~.v__2,Z1 /iCFLF- . . CY°O ~low,%*K9 ok{sitt- -~or to-~j e0.r storm cFs ' ~ - - . . , . . , . . , , . . . . . _ ~ . . , . . _ . ; . . . . . , - - . _ . . . . . . . ~ . . . _ . hAl'IUNAL FvRMULA HYDKULOGY DAl"E = 6/ 14 / 9b DES I GIVER = k: W MCMULH: I N NAS I N ONS T TE+STF:EETS F'ROJECT NAME = ADAMS COURT I DESCFt 1F'TlON F~, - ' 'E- DEVELOFMEIV1 SUBAREA 1=2.27 ACRCS SUBAREA 1 RUIVOFF COEFF I C IEN7 = SUBAREA 2 =.3 ACFES ' SUBAREA 2 F:UIVOFF COEFF I C T ENT = . %55 SUBAREA 3 =.16 ACRES SUBAREA LRUNCIFF COEFF I C I ENT = .9 1"OTF,L AFtEA = 2.73 ACFr'CS COMPOS I TE RUNOF"F COEFF I C I ENT = .362b 37= b2637 QVEFLAND FLOW VAL_UES C t = . l ,C.~ L = 450 N = .v S c_i 15 CH~NNEL FLOW VAL_UES L = c:) TU = U C:,01"iF'UTED VALUES DUR = 10.03 I 10 = 2.24 ' 010 2. il 'q . C! A t). 00 ' ' : NORTH 6RAPHIC SCALE (IN FEET ) t.. 0 25 50 100 I" = 50' ~ 20G~•9 • ~ a r. ` -~~~~l~ ~pp-~ _ ~ . - 1. 2 6 5q~~ . . . . . . . . - , ~ , ~ ~ • ~ ~ - 6 i ~ ~ p- ~ Ir X2~~~ ,n ~ ; • - ` 0 ~cr_ "oo" N 2113 -15 ~ • . ~ I ~ Z O • W ~ ~ ` ~ • • ! - ~ 1 ~ cr_ cr_ k, , t°r ~ c p Q ~ / i Q Q ` q ~h fN . a v-l ~ . ~ ? p 1~' N . ' ~ 25' •S ~ . l ~ ~O • i ~ . jLo'12 . 0 4 ~ . X ~2 0'1 O.~ j 246.63' ~ ~C\ G r o.v e-k , M o~~,-Ex~st~h9------`S ~ - - - ~ 12 TH AVENUE ~ LEGEND ~ ADAMS COURT - 2p6~.9~ ~ 5 0~ ~1evo.~~on DRAINAGE MAP: PRE-OEVEL.fJPMENT P ~ X ~ I NC. ~ ---2oio--~= Conio~r SIMPSON ENGINEERS, N.909 ARGONNE ROAD 0 ~ y- _ f1ow Dtre.c-~ton SPOKANE, WASH. 99212 ~ PNONE 926-1322 - ~raina9e Bo•s~h ~o~hdary . ' . Stormwater Drainage Report: Adams Court ' III. ROADWAY SURFACING DESIGN: The Spokane County Alternative Pavement Design (Interim) for Local Access Pavement Structures was used for ' design of the roadwaY surfacing. From the table, Local Access Pavement Structures, the following information is needed to determine the required surfacing depths. 1) The type of street must.be local access. 2) Soil type (as classified by the United Soil Classifica.tion System) 3) The average daily traffc, ADT Street Type: 12th Avenue is designated as local access (residential). Joyce Lane is designated as local access (private road). ' . Soil TWe: In accordance with "Soil Survey, Spokane County, Washington" by United States Department of Agriculture, Soil Conservation Service, 1968, the soil found at the site is categorized as: GmB, Garrison very gravelly loam, similar to Garrison gravelly loam, except that the surface layer is very gravelly. ' The Unified Soil Classification System classifies the soil as: GM, silty gravels, gravel-sand-silt mixture. (See S.C. S. soils map included) Averaee Dailv Traffic. ADT: To be conservative, an ADT count of,600+ is assumed for 12th Avenue. An ADT count of 0- 200 is assumed for the private road cul-de-sac, Joyce Lane. Desi M. 1 From the table, 2 inches of asphalt concrete pavement over 8 inches of crushed surfacuig is required for 12th Avenue widening. - ' From the table, Z inches of asphalt concrete pavement over 6 inches of crushed surfacing is planned for Joyce Lane. , . . . . , . ; ' . . ' ~ - ~ . • . i : . . ; LOCAL ACCESS PAVEMENT STRUCTURES ~ . . ! ' . ~ ; . ~ . . , ' AVERAGE DAILY TRAFFIC ~SOIL TYPE 0- 200 200•600 C600 ~ _ . , GW 2"/601 . 2176" 2'76s' . GP 216/6'0 21771' 210R11 (G M) 21~~61, 211n►1' C201189 ' . ~ GC 2111711 211/8" 3876" 1 . SW 2111611 21771' 211/71 SP 217611 211R11 2"/810 SM 2'01711 211/81' W/601 ' SC Pavement Design M L 311/6" 3"/8" 4176" - CL Pavement Design OL 4"R" 5177" 511/8" - . MH Pavement Design OH Pavement Design ' . PT Pavement Design ' 1) Soii t e is classifed b the Unifed Soil Classifcation 'YP Y System. :2) Required thickness is given as inches of asphalt concrete pavement over inches of crushed surfacing.- .SPOKANE COUNTY ALTERNATE PAVEMENT DESIGN . (INTERIM) a_ . , ~ a ~ . - ! 3 Z? o . ~ ms , C0vr-4 C~ v e. v~ v ~ ~r~-f- ~ ~ . g- I Z 319 ~ -To p C vr ~ . C-ctl .f- G,-fi-f-c,r- ~ . E P . C urb C~r&~.~., a -O"~ ~(e-u- E. j? ZFjev, ~ G + Z.o?o . 9 ~ 1 ~ 71.ob ~ -t- Z.. s. r 1 _ . . . ? l 3 C. -t- -7 1. ~ 3z o.70.95 Io•0 4. 7t -43 c i. o~ . ~ -7 t.1 o '7 1.09 -71 .Z'9 ~ 70•-l t 70.91 1 c.o8 (O.Z 7(•~3 1.-L7 0 7 i. t8 7(_ 38 70. 80 -7 1 •0 b 10.4- 11-84 ~ So ~ t~.~-Q; + ~(•38 7f-S~3 ~(•o0 7t-~.d ~l-3~ l0•4- 12.0~ I. cz,2 ~-7I- 57 ~1. `I 8 -t ► 9 7(-40 71. sG lo. 3 7Z- Ko -7.I•Gg ?1•S8 -7 I-30 7f•5o 7(-~~ 10,4 1~.Z8 ~140 `I 88 ?Z.vB -7 ( Sv 7 I-?o 86 10•4 7Z Z9.l-7 F ~ _ so -7Z.z~ ~ 72.01 72-z2- 7 (-(:2q- 7 1-84 '7Z.ot i0•.2 ?z.~8 +G s r u IZ. 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Yih • i , S' 'tj;,,~~ ~ .l,ti r', , ~ , : ~s ` ~ ~1~ . ~{~i AJ~:', l:: ' 1~: ~ ~ ~.r yA`;4t~•'~, .t.,l•' ~i ry~ . 1 ~.y . r r, i;~•'~ . ye ~ ~ ~ A~ :~r~.~~~~j~.~/~ , f 1. .JS J + r~"i'~ . 1'! ,~•'4. h~ ~Y 1..'•~~ t~~ • A' '~'i • t ~~"N~~i 1 J'' 'ti~,~4 ' ~ ~t~ ' ~i .s: •r ~`r~t. ~~t~\ a.~ :l~S' ~~~i t~' ~4 • C9 =;r~ ,~t . ~ .1 ~.i 4. ti . ~j 11i' ~ ,5 t\~A !~~y, ~ . ~ ~ ,'y f` ~,Y 'a' J ~`'D ~ r+r,~~y ~/y . _ _ l~i ~iT~ ' ~i 'Te/..~_l ~ Ja ~fC~L . 7'.~~~ ~ ~ • ; . . . _ - - , I . ~ 60IL BURVEY o . 74 . . , ~ SPOKANE COUNTY, WAS$INGTON e~L~ -l~rie de '~tions o soils a►zd tlc T G. f scnp f ezr ?5 est~zrnated T1~ys~cal ancl clae~nical ro c'- . p p rizes Continued Clnssification p ti Cl;t.~si6cution-Contiuucd Pcrccntn c cp L , 6 nnss~ng su~c Dtnp Soil ueme Dcscription of ~oil and sitc from A~~uilnblc 5~.~~~~o~ 6urtnce ~ , T Pcrmcubility ~~~nt~;~ en i • ~ U51)A I~xturU ~a• 4 l~o• l0 Ko. 2U0 R ct on ni.Persian Sluink-~ ion Shrink-awcll ~ Uuificd AASIIO capncit.y (l:5 dilution) potcnt (4.7 mm.) (2.0 rnm.) (O.Oi4 potcntinl . mm.~ Iu. , DsC ~ llrngoon stony silt lonm, 0 to 30 pcrccnt Similar to llraboon silt lonm, U to 30 pcrccnt 1~~. prr hr~ In. ncr ~r~. oJanU yll sloprs. slopcs, exccpt thnt tlie surfncc lnyer is stony. DsD ~ Drugoon stony silt loam, 30 ~0 55 pcr- . ~ ~ ~ • ' ' . . . cent slopcs. ~ ~ ~ DvD Drngoon very rocky comples, 24 io 55 llragoo~i pttrt similar to Drlgoon silt loam, 0 to . percent slopes. 3U crcent slopes, escept thnt deptli to bed- mc tnngt~ from 1(1 to YQ inclics. Rock out- ' crop included in this coulplcz. Ek8 ~loikn silt lonm, 0 to 20 perccnt s1olx:s. Aledium-te~tured, ~rcll-drnined soil formed from U to 2~ Silt lonm_ ~I1,-CL lucial till containu~ n lar c amount of vol• A-4------ 85 ~o ~J5 80 t,o ~J5 GO to i0 0. b F ~ 8~o 5 0. 1 i to 0. 2U G.1 to G. 5 lli h canic nah in ihc surfncc la~'er; undcrlain by 24 to 44 Grn~~elly loam____... _ _ . 8---____ Latir to ~ Low to mod. rrn te. ruvel nt dc th of 30 t.o GU inches~ occu ~rs 44 to 53 1'er • rurell ~ snnd 5~~-------- A-'~------ ~5 to 8~ ~f0 to 80 35 to 50 rrnte. E P ~ A y~ 7 Y 0.8 to 2.5 0.12to0.14 6.1toG.G lli~h iuidulnting, morait~clikc topography. loiui~. . b------. Lo~~•. Low. . 53 to 60 Grnrcl G~~-------- A'2------ 3~ to GO 20 to 50 5 to l5 ~ ~ ~P-------- A-1 ?J ~ . 0 to U 0. Ub io 0. 0~ G.1 to 7, 3 Ili ~1► • 0 35 l0 to _0 U to 5 >lU 0. U4 6--•---- 1,on. 1,o11•. ~ ' t loam 0 to 30 ~r- Similnr (o ~loika silt lunm 0 to?0 erceiit slo es to U. UG G. G to 7, .3 ]1 i~;l,_.___ I,uu•, EIC ~loil,a very stony sil , ~x , P P r ecut slopes. escept that ti~ey nre vcry stony tliroughout. I.Ow. EID Lloikn vcry stony silt lonm, 30~ to 55 . pcrceut slopc.w. Em ~~mdcntsiltloam. Atedium-textured, some~vlint poorly drnincd, Oto2G Siltloam___.___.___ ~IT,-CI, ~ alkuline soil formed in allu~•iuro from cnlcnr- ~-4------ 95 to l00 !10 to 100 90 to 9;~ 0. 8 t ~ i ~h nd di tonitc• dc th ?6 to 91 1'erv finc s;►nd ~ ~7 to 0. 20 7. S to 9. 0 Iligli._._.._ Lo~~• to n eous s~lt, ~~olcan c a.. , n a , p • y lIL_.___... A- ' - • , 1.0 ~c~ter table fluctutitcs from near the surfnce loani. 10100 90 to 100 GU to ~ 0 U. 8 to 5 ~ er~le. Low to rnod. era tc. U, 1 i to Q..0 , 7. 4 to 8. 4 Alodcratc._. Lo«'. ' to nbout 6 fect. 41 to GO Snnd~~ cl~y loam_ ' • CL-------. A-G------ t,o ]00 90 to 9;i 8;, t,o 9 Low. 0 0,2 to 0.8 0.]it~o0.?0 G.Gtoi.,3 1a • Fa8 Freemun silt lonm, 5 to 2~ Ixrcrut ~'ery cleep, moderntcl~ ~•ell dreined upland soils 0 to23 Silt lonm...____..._ ~ o~~-___.._ Alodrrat~ Modrrntc. ~~•itl► mcdium-te~t,urcd surface ln er and medi- 11L-CL_._. ~1-4...___ 9;i to ]00 90 to 100 SO to 90 ~ aloPes. Y U. . to (1. 8 0, 17 to 0. 20 G. G l0 7. 3\f ~ . F a 6 3 I' r e e m n n s i l t l o a m, 5 t o 2 ~ p c r c c i ~ t n m O r m O d C r A t c l~• fi u e t c x t, u r e d s u l~ o i l; f o r m c d t o i_ S i l t y c l l y l o a m._____ _ . o d~ r a l c... L o r+• t o n C L-------- A- G------ ~ J ~ t o 1 0 0 9 0 to l O Q• S O to 9 ~ cr;i tc. t slo}xs, sc~~ercly eroded. from si lt. on ro l ling to l~i l l}• i~p luu ds. 0~ ~0. 0. ] i io 0. 20 G. G to i. 3 1.oti~~---- r FaC3 Frccinni► silt loam, 20 to 30 pcrcent Alo lcrati cr;itc. A1odcrafc. slopes, sc~~crcly crodcd. Fm rresh o•atcr tnarsh. Sh,~llo~~•, st~•am n•, iul.c~rmiti~c~~t ~~on~ls nnd , fringcs nroun ~lakc~ that bn~•c a(IuctuntinF ~ ~rat~cr t;~blc. ~ngincerin~ dnta is ~iot givcn, , as lt~nd type is t~oo ~•ari~ble, GaC3 Gnrfidd silty clny 1o;im, 0 to 30 perccut 1'cry~ ~cep, ~+•ell-drnined soil dc~•cloped in locss 0 ~o ~ Silty cln}~ lo~m.____. ~ n rid ~eto s:~nd knobs on the rollu~ to hill } b to 23 Silt ~ cln~~....._____. ~I'-------- A-G__.___ 95 to ]00 ~►0 to 100 90 tA r slope~, se~crel~ ~rodcd. 0 6 p ~ B ) S CII-------. 'A-7 ~ 0. 2 to 0, S' p, li to 0. ]G G. Gto" . tiplnnds in the 1 zilouse soil nrca. ~ ?3 to 60 Silty cla~~ lonm____.. _ , 4 „ i. 3 ocv...__._ Aloderntc ` 95 to 100 lU to 100 90 to 9,i 0. 05 to 0. 2 O, C~-------- A-G---._. 9~ to l0U ~►0 io l0U 90 to ' ~ ] tu 0. l r 6. G to 3 Lo«•.------ ]ii h. rfodcratc. . , ~ J~ U. 2 to 5 0.17 io U. 20 6. G to S GgA Cnrrison grnvell • loam, 0 to 5 perccut Gra~•cll5~, medium-t.e~furecJ, son~en~liat c~ces- 0 to 15 Grn~•cll~~ lonm._._.._ ~ .3 on~__.____ AlodcratF ]iigh. Asodcrnte. } si~~cl drained soils for~ncc! in ravcll ~ lucui) l5 tq 94 1'cr • r:►vcll ~ loam.. ;~t-------- A-4__.__. G5 i.o S5 40 to RO 3~ t~o ~0 O slopes. Y , 6 ) 6 , J 6 5 to 2, 3 0, GAf_._..... A-2_.__.. gi, t~o G5 30 to GO 5 t ~ r 1'to 0. ]4 G. G 1~0 7. 3 Afodcrnte Lon•. ~ Gg6 Garrison gra~•clly loam, 5 to ?0 prrccut outa•,ish mntcru~l from n~•uriet~• of nci~l, 44 to GO Snnd, Frn~~cl, und C~, o l5 2. ~ t.o 0 p. (I,S to 0. Lon•. slo c. ~~ucous arent rock• oii ~icurl ~ lc~~cl to rnod- cobblcstoncs. A-I___._. 25 t~o 3~ lU t.o 0 tq 5 ~ ~ 7. 3 Alodcr;,tc.._ I,o~~~. P5 ~ p ~ ~ ~~1 U.04to0,UG G.Gto7.3 ]li~ . crat~~lS~ ~lo~,ing tcrr.~ces; drpih to mixtairc of 6}~------- Lot~. - - -LoAV- s;md, ~r;i~•el, and co~l~lcs~onc~s raugcs fro~n , . 2, io 5 fcct. ' Gm8 Garrisan ~~cry~ grn~~clly lo~~n, 0 to S Simillr to Carrison gr~n~cll~~ loam, cxccpt thnt 0 to l5 1'cr~~ grurelly lonm__ , crccnt 51o cs. tlic siufiicc 1H~~er i~ rcr~~ grn~~clly. l5 to 49 1'cry griivclly loam_ _ A-2----•- 30 to GU 20 to ~Q 5 to 15 2, y 1,p p~ P P Gli-------- A-2-----. 45 to G5 (1 ~ r.0 . 0~ to 0.10 G.1 t.o G. G A1adcrntc _ . 94 to GO Sund, gruvcl~ Alld , G ~ 30 t~o G 5 lo l5 5 ~o 0 US to p, Lor~. . cobUlcstones. , A-1------ to 3~ ]0 to 20 0 to 5 ~ G. G to 7. 3 Afodrrntc__. Low. Low. ~ 1 U U. 09 I o U. UG G. G to 7. 3 l I i . 6>>-•----- Lou~. Low. Gn6 Gnrrisan very stany lo~im, 0 io ?0 Siuiilar to G;irrisou gru~•cll~• 1o:un, except I,bnt pcrccnt rlopcs. Ilic surfncc !nS•~r is ~~cr~~ s~on~~. Low. GpA Clenrosesiltloa►u OiqS~►crcentslopc5. 1'cr~• dcer, u~ediuin•tcxl.ured, ~~•ell-drniucd F~~ily Oto72 Sill.loniu._.__._._.. `i~ ~ G B Glenrosehilt) nni~5 t,o20 crcent51o ~es. formrd fron~ aeid i~~icous Klucia) ~ill• surfnce ~J'---- A-g------ b0 ~O 9~ 75 to !15 fi0 to S5 0. 8 t p o, P I ~ ~ 0 2. 5 0. 17 40 0.20 G. l ~0 7. 3 lliodcrstc__ L• GpC Glcnrose silt lunm, 20 iu 30 percent ln}~~r inlluenccd b~' loc,s ancl volcnnic s~1►; oi► o~~ to r~lopcs, gi~nily rullinK 6u sta~~~p upltuicl~s. ~ mod~tnt _ LoAv to modcrate. GpD Glenrosc Ei1t lontn, 30 I.o 55 prrc~~ut tilup~~. • . ; ~ ' s I' ; . ~ ~ t . . ~ . , . . ~,t• , - . . : . - -r• , . , , . ~ , . . ~ . ~ . , , , . . , , ,_..1' . . . . . . . . . . . _ ~ . ' - . .