Yelm Plaza Storm Drainage Report No 1 (2)Yelm Plaza
SIN INANE ~°
~l ~'lza
~~l a hi~z~t~rz
Eel}r~aary 2007
rojet Ifo .anon.
Project;
I'rearecl fcar:
C%~antact:
~ie~vin Ag~nc~
e~Llr3. sCllCtlf?n:
PrCFjeCt Li3TI{Jer:
r(2Jeet L1T1taCt
~"oJ~C~ Iisllif'~r
~1 laze
F'c~~Brest Partners, LI.
e el~.inc~ra Sr.
360-352-200
It ~~el
~It11 11DSt}n
Pr°eare by. fly is Engineering
300 I}escl~tes t~a~ , Ste, X15
~'nxnater, A S50I
(360) 705-247 l~ A~ ~360~ 705-243
intact: Chris 1VI_ erritt, P.E.
Pr~jecte 05026
File dumber: 05026 r.oc
~`~
~~
`~'
P~tt~JEC'.'r E~l~INI'El3' CE~#TIEICATION: I hereby certify
that tlxis final ~z°ainage Report for YeF.nz. Plaza in helm,
YtFashington has been prepared by zne ar under my supervision and
meets the zntent. of ttae t~rSDflE Stormwater Management Manual
fc:r ~r4resterr~ ~iFashington, 1~1?2 ed., and the ~'hurston Counter
L,rainage l3esigrs ancfl Erasion Control Manual (DI?EGM}; 199 ed.,
unless noted ot,hcrwise, acid zaarmal standards of engineering
practice. I understand that the ,jurisdiction does not and will not
assname liability far the sufficiency, suitability, ar performance of
~arn~~~ t` o~2itn~a elesi~i~e,~ £rFr t~ia ctevelapancut.
1.
~~ !i f' .;.._..~,..~.. L ~ ~~ 4'7!6 ~ f
le tent
~~~T rar ra~cE~Ar~c ~z~~a~v ................................................a..,,,,..,...,.. ~
S~~`~~CkN 1. - REQUI~I~ ~TTi~T~NC'E..........._ ................a.................7
S~~TIQ2~F `~ - ~tESE'O~3SI~~ E ~I~~xANII4'I'It~}N ...................................... ] 7
~~C',T~4I~T 3 - VEGETA'I°I(}N I47~NA~x~MN~' ~Z,~~I~T .............................. 17
S~C~'ION ~4 - ~C}€i~.C'~ C4N°3'~t~L......._ ................._..,,.................._........ 27
~~
1 T
T1 1 - J~ ~ ~ ~'~
prepared for:
ontact~
rj~~t ve ie
~'ourbest partners, I13~C
ike cliinnon fir.
360-32-.2(104
22730130:900
X3.23 Acres
-]_
lO Plaza I9r I~,TE ~elnz, A 5J7
grading, IJtili.ty, Building, etc.
~Sectian 24
~`ownship 37 I~lorth
Stange 3 Bast, ~.1V3.
'I?he project site is Iocated adjacent to elnz Avenue (~. X07) in helm, Washington.
'The applicant proposes to construct a cozaamercial building and site improvements
for the use of servicing autoanobiles.
The development will be constructed. in ox~e phase. Construction will include
clearing and grading of the site, stozm drainage improvements, underground
utilities, parking lot construction. and paving, frontage improvements, and
extension of water and sewer to the building.
tor~rawater facilities will consist of catch basins with associated piping, a
~orteclzs vault for stor .water treatment, and underground torrpech chambers
for storznwater storage and infaltration back to grauizdwater.
tc~r ater Treat en:
All on-site stornzwater runoff will sheet flow to catch basins azzd piped to a
~fortecs treatment vault. `S'he proposed ~%orteclzs unit meets the minimum
tre~.tinent requirements per the t~~. See the aptaencl~~ ft~r st.ur~tt~r facility
sizing calculations.
3
Stor a~v~er ~ts~ra
oof ono
I~.oof downspouts shall e taght lined to the unergrorind storage chambers with
6"-~" diameter I'~C pipe.
SECTIt~N 2 -EXiSTih1~ ~®ItiIDITI~IVS
There appears to e no lzastory of flooding or other drainage related pxolerzzs on
the existing site or tributary to the existing site.
I 3 -I FILT I S 6 IL. E
The foal Conservation service { ;C) soil sua°vey of Thurston County classifies the
o-site sails as panaway gravelly dandy l~oarn {~Iydrol.ogac group ~). foil
testing confirmed the parzaway series classification. ~ design infiltration rate of
'Q inches per hour lzas beers arsed :in azzfiltration facility design. fee appendix far
soils report.
TI 4 - !.!. E TIC TE
l'~o on-sate wells were found during our site investigationz of this proposed
development. Water arzd sanitary sewer servaces for the proposed project wall be
provided y the City of ~elrn.
lido abandoned or existing septic s~Tsterns were identi~aed on-site during our site
investigation.
E TI -F L T
l'~o fuel tanks were located during our site inspectioz2 or sails work, C~lyxnpic
Engineering reva.eed the latest "Z.ITT" list Leaking Underground Storage Wank)
and found no listing far tlxe subject site.
T6 - - ~I E i TI
The praject site is lacated wi.tlxizx the. Visually River Drainage Basin per Thurston
C',ounty ~ozrzprehensive 1 ap 3. ~'ro ozzr site visit there were nca signs of existing
drainage swales or channels on tl2e prapased propertye There did not appear to e
any significant aff-site rzznaff onto the site fro. the properties®
ldazardaus zxxaterial handling ar transpartatiazx is not expected in the area
tributary to tlz.e on-site detention facility.
E9 - LY 1 1 -l°
The prapased site does xxat lie adjacent to or eontaiia a stream an-site, therefare, it
lxas not been identi.ed as a 100-year flaad hazard area.
TI 8 - EST ET SI E TI tLiTiE
.All disturbed pervious areas including the storm treat area will be vegetated and
landscaped.
SE~T~C3t~ 9 -[?QWNSTF2EAM AIV,OALY alb
Final caleulatiaxxs far the praject starnxwater treatzxaent and storage systeans are
included in the Appendix of this report.
All starznwater rzznoff generated y site development will be treated, stared, and
infiltrated an-site. In the event of a failure, starzxz water will averfla back rota
the an-site catch basins aiad eventztally onto tlxe parking area. Adjacent properties
sozzld xxot be affected due to failure of the proposed starmwater system.
Drainage facilities including catch basins, piping, trenches/galleries, and the
treatment facility will require razitine nzaintenazxce. A maintenazice agreement
will be prepared. and finalized. prior to final project approval.
3
T 1 ~,
C1'1 1 - S f E
~'anstructian Best cage ent Practices fB F's} will be employed to praperly
Blear and grade the site and to schedule constrxxctian activities. Before any
canstruction begins on-site, erasian contral facilities shall first e installed. Tlxe
planned canstruetian sequence is as fallaws:
~ECTi 2 -T I G~ I E °T
A stabilized constructian entrance shall be installed at the entrance to tlxe
prapased project to prevent vehicles franc tracking soil away frann the disturbed
areas, if sedinxent is tracked onto the surrounding public roadways, sediment
shall, an a daily basis, be swept ar shoveled fronx paved surfaees and not washed
4tan into the ro~clsicle stc~rnx ciraixa~~;o syst~rrz.
The eontractaz° shall. not be allawed to leave disturbed. areas greater than S,OOtI sf
that are to be left un-worked. for mare than twelve ~2} hours axncovered during the
4
rainy season froaxz l~Tovenaer 1. throazg. March 3f. I~[izlclz, sodding or plastic
covering will e used. to prevent erosion in these arose.
Eluting construction, the contractor will also be required to install filter fabric
fencing as needed, pe.r tlae erosion control plan and as directed by the Engineer, ar
pity Inspector.
TI - A T I T !. T TI
X111 disturbed areas will e paved, covered with a building or landscaped with
grass, shrubbery, or trees.
CTl 4 - E T~~ IC L.YSIS
`here are no slopes exceeding 15°,fo on-site, therefore, a geotechnical analysis was
deemed. unnecessary,
ECTI 5 -1 ~ECTI E GIB
In addition to the a~orznal pity inspections, the Project Engineer shall inspect the
facilities related to storan water treat ntA erosion control, storage and
conveyance during cozistructioxl. t a mini aznz, the following items shall e
inspected at the tinge specil"ied:
I. `I'lze erosion control facilities shall e inspected before the start of clearing
and grading to ensure the followizz structures are in place
a. construction Entrance
b. Filter Fabric Fences
c. Inlet pediment Protection
t~ final inspection shall be perfarzned to verify final ga°ades, settings of structures
and all necessary iaaforation to complete Ezxgineer~s Cox-zstructiozz Inspection
~epcart to orzn and Goxnxnerci.~l E~gr~exzaexat to maintain storxn~ter facilities. These
forms rrz.ust be completed prior to final public worl;_s construction approval..
5
C T L F LL 1" 7 I E s
~Vasaut fra a cancrete truck shall net be dumped rota the sta drain, ar ante
sail. ar pavement, which carries starmwater runaff. It can be dumped i.nta a
designated area to be later backfilled ar hardened and braken up far dispasal rota
a du~r~pster, 7['he ~'antractar will e required to designate wash. dawn area far
equipment and cancrete trucks.
6
T" 111 I
~ 1 - l Tl=
'~ha foxing pages captain maintenance Heads far anost of the camponants that are
part of year drainage system, as wall as far same caxnpanants that you may not have.
f.,et us knave if there era any camponents that are missing am these pages. Ignare
the requirements that do Hat apply to youur systa tau should plan to camplata a
checklist for all. system companaxxts an the following schedule:
t. 1~~anthly fram November tlxroug .April.
(Jnca in late summer ~prafarably ~apte ber}-
3. ar any major starm (use 1"° in 2d hours as a guidel~ria) items marked'"" only.
fTsing phatacapies of these pages, check off the problems you baked for each time you
did an inspection. .Add comments an problems found and actians taken. Leap these
"Ghackad"' sheets in year files, as they will be used to ~vrita your annual rapart (due in
I~~ay}. lama itaxns da Hat Head to ba baked at every time an inspection is dens. -Case
the suggest frequency at the Ieft of each its as a guideline for year inspection.
a~x xnay call the jurisdiction for technical assistance. 1?laasa da Hat hesitate to call,
especially if you era unsure whether a situation yaax have discovered may be a
prabla.
7
Ix~se~tzc~n I~eri4Cl~
AlW ~'9 1M 41~~3L' 1''~(';~s77~~59P~t1.T
uyber of sheets t~tt~cl~e:
date Izzsected:
aasectt~r's Sigxz~t~~re;
L'~ 1-~11S~lYlElV 9. t8 ,q Rt, lV 1. ~AV AJI'J P1S. \.f BAR..
ainteance Checklist for Conveyance yste s ies, Ll~tches and ~Swales}
Frequency Drainage v~ Tteq'd Problem Conditions `Po Check For Conditions That Should Exist
System Feature
M.S. Pipes v° Sediment c~ Arcumazlated sediment that Pipe cleaned of all sediment and
debris exceeds 2o4fo of the diameter debris.
of l'.lze pipe.
'~ Vegetation Vegetation that reduces free All vegetation removed so water
may°oent of water through flows freely.
pipes.
~ ~ Damaged Protectave cos#.ing us Pape repaired or replaced.
gusted, beast damaged, rust is causing
or eruslied) snore than 54;~o deterioration
to any part of pipe.
~ ?` Azay dent that sigzsz6cantly Pipe repaired or replaced.
impedes flow (i.e., decreases
file across section area of pipe
by more then 2t}°la)-
~ ~ Pipe has major cracks ar Pipe repaired ar replaced.
tears allowing groundwater
leakage.
M.S. Swales `T'rash & Dumping of yard wastes such Remove trash and debris and
debris as grass clippings and dispose as prescribed by County
branches into Swale- Waste Management Section.
Llnsiglztly accumulation of
non-degradable materials
such as glass, plastic, metal,
foam and coated paper-
~1 Sediment Accumulated sediment that Swale cleaned of all sediment and
buildup exceeds 20°!Q of fire design debris sa that it matches design-
depth.
~ Vegetation Grass cover is Sparse and Aerate soak and reseed and mulch
not growing weedy or areas are bare areas. Maintain grass Iseight
or over-graven overgrown wik.h woody at a minimum of fi" for best
vegetation. stormwatzsr treatment. Reniave
woody growth, reeontaur and
~ reseed as necessary.
M Conversian Swale lies been filled in or Tf possible, speak with homeowner
by home- blocked by shed, cs=oadpile, and request that Swale area he
owner tca shrubbery, etc. restored. Contact County to
incompatible report pmlalem if not rectified
lase voluntarily.
A Swale does GF`ater stands in swale or A survey may he needed to check
not drain flow velocity is very slow. grades. Grades need to be in T~fo
`,~'tagasation accurs. range of possible, Tf glade ss less
than T°,o, under drains may need
to be installed.
J~~ ~~~- ,~=~~Ett~, wuo4uer a prt.RUZem exasrs, pcease contact the Juris€lzction and ask fiar technical assistance.
t1~i11YiL' tt A tW ~L.!V1V T A'a.S.T )
I~~Iainteance Checklist fer ate sins n inlets
Frequency Drainage ~1 lleq'd Problem Conditions To Check For Conditions That Should
System Feature F'exlSJt
M,S General ~ Trash, Trash or debris zn front of the No trash or debris located
debris, and catch basin opening is blocking immediately an front of catch
sediment capacity by more than l4°!0. basin opening. Grate is kept
in or on clean and allows water to
IPa^aen entC'r.
~ ~1 Sedsment or dehrzs (zn the Na sediment or debris zn the
laasin) that exceeds 1/3 the catch basin. Catch basin is
depth frown ties bottom of basin dug out and clean.
to invert of the loo=est pipe into
or out of the basin.
h~,S ~ Trash or debris in any inlet or Inlet and outlet pipes free of
pipe blocking more than lf3 of trash or debris.
its hezglzt_
I4S ~ Structural Corner of frame extends more Frame is even with curb.
damage to than. 3f4 inch past sorb face
flame into the street (af applacable~.
azadfor tap
slab
M ~ Top slab has holes larger than 2 Top slab is free of holes and
square inches or cracks wider cracks.
than 1/4 inch {intent is to make
Stare all material eS rnalmng
into tkae basizt).
Pal ~ Frame not sitting flush on txap Frame is sitting flush on top
slab, n.e_, separation of more slab.
Haan 3f=# loch of the frame from
the top slab.
~1 ~~ Cracks in Cracks wader than 1J2 inch and Basin replaced ar rz'paixed to
basin longer than ~ feet, any evidence design standards. Contact a
xrallsl of coal particles entering catch professional engineer for
laottzam basIIn through eraeks, or evahzataon.
maAntenanee person audgas
that structure is unsound.
A ,f Cracks wider Haan lf`~ inch and No cracks mare than 1l~1 inch
longer than 2 foot at the joint, o£ wide at the jcaint of
any izaleUoutlet pipe or ang azxletfoutlet pipe.
evidence o£ soil particles
entering catch basin through
eraeks.
~Q
A A.~ ENT "A'> (CNTI EDP
lviaitean~e f%eckhst for Hatch seine an€[ Inlets
Fregztency Drainage ~ Feq'd Prolalean Conditions To ClaecR; Fear Conditians That Should l;xist ~
System Feature
NI,S al Fire hazard Presence of chemicals such 1Vo color, odor, or sludge.
or ether as natural gas, oil, and Basin is dug taut and clean.
pollutaCa^ gasolene. C)hnoxaoxea COIOr,
odar, or sludge noted.
>S ~ Outlet pipe as Vegetation or roots growing laic vegetation or roat growth
slagged. with in inletfoutlet pipe joints present.
vegetation that is more than six inches
tall and less dean six inches
aparP:.
A ~ Settleent/m Basin lass settled mom than Basin replaeed or repaired fa
23aldgn-m€.`nt. ~. YriCla Or ha$ rotated more desagn standards. l~ontact a
Haan ~ inches oast of professional engineer for
alignment. evaluation.
If you are unsure whether a problem exists, please contact the ~lurasdiction and. ask for technacal assistance.
(',omments:
~P~ A =Annual (1Vlarch or April preferred}
I42 = Mantlaly (see schedule}
S =After major storms
l~
t9 taL•~J.t1YLSSiY t to A ev fLr4Jl'E 11 l.l~
1Vlaintenance Checklist car reds {Lans~apin}
~re~uency Drainage ~ Problem Canaiti4ns t4 check k4r c4nditians That sn4%%ld exist
system
~eatnre
i~f
i General ~ Weeds Weeds growing in snore than Weeds present in Iess than 5°fo of
(nanpois4nous) 24?°f° Qf the landscaped area the landscaped area.
i
i
(trees and sl%ruhs only).
i
l'/I
i
v
tafety hazard
.any presence of poison ivy or
No poisonous vegetation or
Otl22r p4%s4nati^a Vegetat.74n ar %nBeCt neSCS present 2n
insect nests. landscapes area.
M,S ~ Trash or titter fee Ponds Checklist. See Farads Checklist.
iVI,S ~ Erosion Qf Noticeable rills are seen in Causes of erasion are identified
Ground Snrface Iandseaped areas. and steps taken to slow
downfspread Qut the water.
Eroded areas are fiIled,
contoured, and seeded.
A Trees and ~ l?amage Lambs or parts of trees or Trim treesfshrubs t4 resters
shrubs shrubs fleet are split or shape. Replace treeslshrubs
broken whaeh affect more with severe damage.
than 25°0 of the tot:.al fatiage
of the tree or shrub.
Trees Qr Sl%ri1ID,~'s that IBaVe RelBla rat, tree, mSpC'C$%ng for
been blown down ar knocked injaary Co stem or roots. Replace
Aver. if severely damaged.
A ~` Trees ar shrubs which are P1aee stakes and rubber-coated
net adequately supported or ties around. young treestshrubs
are leaning over, causing for support.
exposure of tl%e roots.
if g*au are unsure whether a problem exists, please contact the ,lurisdiction arad asl; far technical assistance.
C`,ontments:
lieu
A = ~.ranuaI {!larch or April preferred}
M =1VIQnth,ly (see sel%edulel
S =After major storms
~~
A*ASSXJ.~1~$.E BW~fR (C'}A~S.$a.'d .0_'8.t~~
IV~~intenanee Checklist ft~x° nltraica ~txxa~
Frequency Irainage ~ Req'd Problem Conditioass to Check For Conditions That Should Exist
Sys#em
Feature
M,S General ~ Trash 8~ See Maintenance Checklist for See Maintenance Checklist for
debris Ponds. Ponds.
buzldazp zn
pond
M ~ Poisonous See Maintenance Checklist for See Maintenance Checklist for
vegetation Ponds. Ponds.
E M,S v Fire See Maintenance Checklist for See Maintenance Checklist for
f hazard ar Ponds. Ponds.
pollution
G M f Sfegetatzon See Maznt.enanee Checklxs#. for See Mazntenance Ghecklast for
I not Ponds. Ponds.
growing ar
is
overgrown
M ~ Rodent See Maintenance C;heeklist for See Maintenance Checklist for
holes Ponas_ P®nds.
M ~ Insects See Maintenance Checklist for See Maintenance Checklist for
Ponds. Ponas.
A Storage ~ Sediment A soil texture test indicates Sediment is removed andlor
area buildup in facility is not working at its facility is cleaned so that
~ system designed capabilities or was infiltration system works
incorrectly designed_ according to design. A
sediment trapping area is
installed to reduce sediment.
transport into infiltration ama_
A ~ Storage A soil texture i:est indicates Addi#.ianal volume is added
area facility is not working at its through excavation to provide
drains designed capalailities or was needed storage. Soil is aerated
slowly incorrectly designed. and rototilled to improve
(more than drainage. Contact the City far
4ti hours] information on its requirements
or regarding excavation.
overtlows
M v Sediment .Any sediment and debris Suing Glean out sump to design
trapping area to IQ¢/'o of depth from sump depth.
area bottom to bottom of outlet pipe
or obstructing slow into the
connector pipe.
One Time ~ Sediment Stormwater enters izfiltration Add a trapping area bt=
trapping area directly without constructing a suing for settling
area not treatment. of solids. Segregate settling
present area from. rest of facilii;v.
Contact City for guidance_
M hock filters ~ Sedamen#, lay visual znspection little or no Replace gravel in rock Slter-
and debris eater t7ows 4:hrough filter
daring 5ieavy rain st-terms.
S Infiltration J Infiltration Standing Water in Inspection Excavate bottom of trene.h as
Trenches Failure Well After 48 hours after neeessarv but at least 3 feet.
storm nr Qverfiovv during Replace with crushed rack_
~. ~
+torrns Check pretreatment systems
for effectiveness. Check
tribsxtary area for sedzment
sources.
If you .are unsure whether a prohlena exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
l~ev A =Annual {March or April preferred)
M =Monthly {see schedule)
S =After major storms
A . ASH l`3T'°A' {~~JN`~'~ Eli)
1V~aintenanca checklist far ~los~d Retention ~~stems {Tanbs(Vaults)
Freq. l3rainage v lieq'd Problem Condztions to Check For Conditions That Should Exist
System
Feature
ill Storage Area ~ Plugged Air Clne-hal£of the cross section afa Vents apen and functioning.
Vents vent is blacked at. any point or
the vent is damaged,.
M Storage Area ~ Debris and Accumulated sediment depth All sediment and debris
Sedsment exceeds IEI~fo of the dzameter o£ removed from storage area.
the storage area for 1 Length of
storage vault or any point depth
exceeds 15~1n of diameter.
(Bxample: 72-iflxch storage tank
wauid require cleaning when
sediment reaches depth of 7
inches for more than If2 length
of tank.
A Storage Area ~ Jaiaxts Any openings ar voids allowing All joint between tanklpipe
l3etweeu nxaterial to be transported rota sections are sealed.
TanklPipe facility. (4Yill require
SeCtflon engxneer2ng analvsxa to
determine straTCt.urai stabzhty}.
l-~. ~tarage Area ~F Tank Plpe Any part Of taLlk~plpe iS Dent aUt Tanklpxpe repaired ar replaced
Pent (?ut of of shape mare than 10°fo of its to design.
Shape design shape, (Pev-aew required.
~ by engineer to doterflnine
SCructural stability).
A Storage Area ~ Vault Cracks wider than If2-inch and Vault. replaced or repaired to
Structure any evidence o£ soil particles design sgecificatians and is
Includes entering tlxe structure througlx structurally sound.
Cracks in the cracks, or
Wall, maintenancelinspectian
Bottom, personnel determines that the
damage to vault. is not structurally sound.
Frame
andfor Top
Slab
A Storage Area ~ Cracks wider than 1!2-inch at hla cracks mare than 1?d-inch
the joint of any inletloutlet pipe wide at the joint of the
ar any evidence of soil particles inlet(autlet pipe.
eTlter131g the Vault through tlxe
walls
A hlanlxole Cover l;Icrt Cover is nxissiixg or on3.y Manhole is closed.
in Place partially in place. Any apen
manhole requires maintenance.
A Manhole 1° lacking Cddeclxanis cacxnot be opened by Mechanism opens with proper
McClxaniskn one-' matnt4'nanCe }?erSQri wlt}t tOQls.
I~Iot. proper tools. Dolts Into frame
Working have less than ll~" inclx of tlxread
(may not apply to self-locking
lids>.
A Manhole tit t"over tine maintenance person cannot Cover can. be removed and
I>icuit 1o remove Lid otter applying reinstalled by one maintenance
1?.ernove normal Ixlt:ing pressure. Intezxt person.
is to keep saver from sealing off
access to maintenance.
~~
Freq. Drainage ~ 13eq'd Problem Conditions to Check For Canditions That Should Exist
Systean
Feature
A Manhale Madder Ladder is unsafe due to anissing Ladder meets design standards.
Rungs rungs, mzsalzgnent, not Allows maintenance person Safe
Clnssfe securely attached to structure access.
Wall, rust, or cracks.
if you are unsure Whether a plslem exists, please contact the Jurisdiction and ask for technical assistance.
Comments.
lieu A =Annual (March or Agril preferred}
AB =Monthly {see schedule}
S =After major storms
~~
ECT! 2 - ESP SI LE IZ Tf
the property owner shall e responsible for the operation and maintenance of all
on-site drainage facilities.
ECTI 3- EGET T'[t:? A E T L
All disturbed pervious areas within the site will e landscaped to provide an
aesthetically pleasing environment„
ECTI 4 - CE C L
Warning signs ~e.g•a "Dump No waste _ Drains to ~~ronndwater") will be embossed
or painted on or adjacent tc~ all. star drain inlets and will e repainted
periodically as necessary.
17
appendix
~i~c~l ~°~ci,~e c~lcltir~ns
FIAI.~ RINAE CUL,ATINS
The following calculations were based on the zequireents contained in the SDE
Storzxxwater Management Manual, IJJ edition.
SIN A BASIN IN TI N SLT
'~ ~. `€~'- ~''~'~ ~: x~ 1, ~ ~ ~ ~ ~ 3rd `~ ~ R `~~~ ~ "~` ~~ k ~ ~ ~ ',ti ~r ~ '~~ ~. .~ `;Rn ~.
~.xk. ,~i. 'a ~,., a,:.~. ~, 's ,.,.,. .,. Cw~`,~: .i'_.~ , ~..~~ ~, aw., F,.,, ~M
~.,
+*},„~aa ;,xk
~
?
`~ ° ,s~
"~ ,
~.
' fix
. ^
'`~ ,
~
.
. .
,
. .., ., .. ..
._ .
,
., . .,,
.
,.
,.,.. i
.v..
.
Sub-basin A Total
Impervious 0,J p,~g
FarkinglSidewalk
Impervious Roof Area 0.22 Q,~
Disturbed Pervious 0.12 p,1
Total 0.83
Sail (;lssificatio:
SCS Soil C'lassificatione Spanaway C:ravelly Sandy I~oaxn
Hydrologic Group: A
Design Infiltration Hate: 0"Ilzr
A U I C CLATIC)S
ini um Stormater Treatment ea egaiire
Sto Shed software was used to model the runoff from the on-site parking and
sidewalk areas. The 6-month stczrm errant resulted ixx a ilo~v rate of 0.13 cfs. The
140-year flow rate i.s 0.73 cfs.
Per the General LTse .Bevel Designatian far Pretreament (TSS) for ontech
Storxnwater Solutions, Inc. Vorteclas System provided y DQE, dated November
19, 2003 (updated May 2006), a orteclis odel 1000 vault will be needed for
this application. The Model 1000 vault will provide adequate stormwater
treatment up to 0.55 cfs with a 100-year pe~.k flow treatment capacity of 1.6 cfs.
ATE UANI CU TI S
15 Storin'I'eeh ~haxizbers:
Stare ~~olume wf 12" Stone Dase
~~ 12" Pex•izneter (30°f~ void ratio):
~15)(d5.9 cf(chaxner} = 688 of
= 534 cf
7'otcrl Star°age Tfolzrre rovzc~ed
= , 222 ra f a ~'S ~ c .: t?
Active ~olxxzne = 657 cf {see attached StorShed software output)
our raw o
X30' x 15.75')(20 ~n/hr)(1>/12"~(4S ~Caursj = ~t,10 ~f > 1 c . ~ 4?K
4 Ul~TQ
Hoof r~znoff w~Il e tzgtline to the ~fa~tx°~tiox~ gallery.
aG-740 Quantity Calculator Praject ame Yelm Rfaza
Project 1~6umer #fQ5Q26
F'raject t_ocatian 1°efm
i0aluma in chambers
Volume of axcavatian
Amount of stone
Voiumo in stone
Amount of Filter Fabric
8~umber of Chambers
Number of l^nd daps
Aaunt of Mane
Amaunt of Filter Fabric
Ivan- even Isalatar Raw
even Isafatar Raw
689 cf
2,968 cf (system only - net total excavatfon~
1,780 cf 6 car
534 cf
1,925 s (not include lsalator Row)
Total Storage Volume
1,222 cf
£~iypic Engineering Vista Green Piat
p50Ct9
star it --
asi .vent u
E3asinlC~ Peak Peak T Peak ifol rea ethod
Event
------- {ef) {hrs {ac-ft) ac floss
gas€n A - wc~ .~ a s.ao 0.0~3~ a.4s sCSOSC~
rains a rea. asi
yd Method: SCS Unit 1-iyd
Peak Factor: 484e00
Storm [fur 24.00 hrs
Area CN
Pervious 0.0000 ac 86.00
impervious 0.4900 ac 98.00
Total 0.4900 ac
Supporting Rata:
nnpervias C Data:
Impervious parking sidewalk 98.00
I~eious l°G Rata:
Flow type: Qescription:
Fixed None Entered
Irnpei®US TG Rata:
Flow type: Description:
Sheet Parking Sidewalk
Channel PVC Pipe flaw
1teC_ Ua~lt -- '~ - ear
rainae rea: sin
~iyd Method: SCS Unit Flyd
Peak Factor: 484.00
Storm Dur 24.00 hrs
Area CN
Pervious 0.1200 ac 88.00
Impervious 0.7100 ae 98.00
Total 0.8300 ac
Supporting Rata:
Pervious ~ Rata:
Pervious Landscaping 38.00
pervious CN Data:
Impervious parking, sidewalk, roof
!'ervious TC Data:
Flaw type: Description:
Sheet Landscaping
1 pervious TC Rata:
~tosmShed
2f24/2007
F~aintype
TYPE1A 6 mo
Lass ethod: SCS CN Number
SCS Abs: 0,20
TG
0.00 hrs
0,06 hrs
0.4900 ac
Coeff: Travel Time
0.1000 0.10 min
Coeff: Travel Time
OA100 2.01 min
25.0000 1.56 min
Peak 4'0l Area ethod F2aintype
0.1200 ac
98.00 0,7100 ac
Length: Slope: Coeff:
15.00 ft 2.00°/a 0.1500
Travel Time
2.72 min
1 of 3
C?lympic ~ragineering Vista ~reerD Plat StormShed
#45049 212412407
Flow type: Description:
Sheet parking, sidewalks
Channel roof
Channel PVC Pipe flow
Length: Slope:
134.00 ft 1,50®l0
150.00 ft 1.00°/Q
165,00 ft 0.50°la
Coeff: Travel Tme
0.0100 2.01 min
25.0000 1.00 min
25A000 1.56 min
af'r atl~l~
LPD PUTE [LI'] SU Y
100 yr MatchC~=PeakQ= 0.7206 cfs Peak C?ut (~: 0.3998 cfs - Peak Stg: 343.78 ft
Active Vol: 657,45 cf
a e~ao of aI L. Gaol sate
rject reci s
E2 yr] 2.00 in
~5 Yr~ 2,50 in
[10 yr] 3.00 in
[100 yr~ 4.00 in
~6 mo] 1.28 in
rains rea: asin
Nyd Method: SCS Unit C-lyd
Peak Factor: 484.00
Storm Dur 24.00 hrs
Area CN
Pervious 0.1200 ac 88.00
Impervious 0.7100 ac 98.00
Total 0.8300 ac
Suppartirtg Data:
Pervieus CN Data:
Pervious Landscaping 88.00
Irtaervir~us CN Data:
Impervious parking, sidewalk, ~ roof
P"erviaus ~'C Data:
Flow type: Description:
Sheet Landscaping
Irnpeiaus TC Data:
FIo type. Description:
Sheet parkingp sidewalks
Channel roof
Channel PVC Pipe flow
Loss ethod: SCS CN Number
SCS ,4bs: 0.20
TC
0,05 hrs
0.08 hrs
0.1200 ac
98.00 0,7100 ac
Length: Slope: Coeff: Travel Time
15.00 ft 2.00% 0.1500 2.72 min
Length: Slope: Coeff: Travel Time
134.00 ft 1.50°l0 0.0100 2.01 min
150.00 ft 1.00% 25.0000 1.00 min
165.00 ft 0.50°la 25.0000 1.56 min
2ot3
4?6ympic Engineering Vista ~r€:en Fiat
#45009
~ .EST '~
[100 yr ottt]
Ls~E
i-f~dlQ Peak F'E=a14 T F'Ba V4~I
_____-- ~cfs~ ~hrs~ (ac-ftj
`t44 yr out 4.44 8.25 4,2495
ST'ORLIST
[Infiltration]
E.STEI~®
e I : in~ftratio
Gont Area
ac}
4.s344
d3esc: lnfiitration Gaiiery
Mart El: 341.5000 ft ax ~I: 345.5000 ft
Gontrib I~asin: Contrib Flyd:
Length idt Void Ratio
39.0000 ft 15.7500 ft 30.00
iSCLiST
[Infiltration]
LsaTEN
ontrol tractors 1 : tfiltratio - Infiltration control structure
C~escri: Infiltration Gallery
Mart EI 1Viax EI Increment
341.5000 ft 345.5000 ft 0.10
Infil: 20.00 infhr caltilir: 1.00
StormShed
2!2412447
3 of 3
ESE USE VEL IAN N °~ EA ENT (TSS)
r
C` N'TC Star vwtr Solutions nc. ~c~rtec s~ yste
Ap licat: ~'I~ITE~I~ Sto awater Soltrtions Inc., anufacturer and Vendor
Applicant's Address. 12021 NE t~itort ~Vay
Portland, C~I-~ 97220
A licatit~n oc ents4
Applicant's Perfor ante ~iain~s.
used on laboratory trials, the Vortechs System will achieve a~a 80°f~ TSS removal efficiency for
sediment particles ranging from 38 to 7S microns at an operating rate of 13 gallons per minute
per square foot (tsPl~il!sfj at the peak flow far the Ecology design. treatment storm.
The systean is recommended only for sites likely to produce relatively high TSS concentrations
(above t00 mt;/L), where TSS is primarily composed of ~0 rr~icrons and. larger. Potentially
appropriate sites include parking lots, laigh~vays and urban streets, material transfer sites,
hydrocarbon transfer sites, retrofits, steeplerosive sites, and space-lir-nited sites.
Tec ial evie tom ittee~s eco endatlon:
'The ~ finds that-.
The Vortecs system, sized at 35 G fs4 should rovide3 at a minimum, equivalent
performance to a resettling basin as dezaed in the most recent ~tr~rnzwater anagernerzt
~arzual for ~Yest~r~tz czshz~tr~rr), '~lurtze ~; ~`apt~t° ti.
Findings of Fact:
Technology escrz .Lion:
~l)-RC) of Vortechs System Technology Repoz~t, dated June 2003, may be requested from
CC3TEC Stornzater Solutions inc.
Design Manual and technical bulletins can be downloaded from company's ~veb site.
sC~a~tact Infor ati~~m
A~pplaeant Contact:
ticant wesate:
~~O~oc°~' iVe~ ~1n~:
Sean I~arc~F
(800} 548-4667
darc~s~~contech-ci.corr~
~~1~u 4t.C~3Ilt~C~1~t4?T[11V~'~~~'.GC1~1
att~°ll~~; ecy ova ?o~frc~ ~r~arn~1~~Fc~fstorrwaterle~~tecr`index ht
geology: zeke o~ap~n
~Tater t~ality rograrr~
(360 407-6435
rr~o461 L ~cy..;ov
itsa County
(360) 337-7292
dtucer~~r,co.katsap.~a.us
.~4ppe~~c~i ~
pails e~°t
1 S C Ct ~' Y` 1 P S S
its es: X202 ~ S7
a rce u er.221 3
re are or. car s ~: rs, L,T..:
PE
LIB ENS EE
.ICE C TI T
E L ITE I I
v ~`~ ~. .
tL 1 ~
2: tL L 1
orz
A
Buv~
C1
C2
'7 g''^'~+ LaCial VNt'Y`Y a+Fh T'~1d ~.F °c "' 4 "S ~U98
(. LVt\.IlEN E ~V.~4 { ER QE~ i w 1 T~.f ~ P`ER{fIV VE.J a'.. ~0.d\.fEL NELFVJ.
DEr T ~E~.
120" Greater than bottom of hole Nearly Leuel
13. FINDINGS REGflMEDATLtONS: Static water Leuel oyes 120" below the existing grade. Use a
design infiltration rate of 20 inlhr or Less for drainage infiltration facilities Located in the G2 horizon soils.
C?__ e~th Coiar ~'eure
0"- 24" 10YR2f7 GrYFSa~m
24"- 32"' 10YFt4f~ GrVFSaLm
32"- 34" ~ OYR4t6 VOrLmSa
34"- 6f" 10YRSJ4 ExGrCSa
many stanes
67"-'i56" 30YE2061 ~xGr&Cab
CSa
same stanes
Sails Strata es~riptica~
Soil L.~ #~1
°kCL °loORO ~F SCR MOT IND CEM ROO ~7C> FSP
°~20 <5 <9S 1S~K _ _ ff 2-6 2
X20 - <2 a i SSK - - - ff 2-6 3
<10 - <55 SCa - - - - 6-20 6
~c1 - <00 SG - - - - >20 >40
reviaic~ns
Textural lass trctre ra es ~f Structure
(Textured (T
Cobble -Cob Granular ~- r Stron -
Stoney - St lucky - iky oderate -
Graveily - Gr Platy _ Pi eak - 1
Sand _ Sa assive - as
Loamy - Lm Single Grained - SG
Slit - Si Sub-An uiar Block - S
Clayey - Ci
Caarse _ C
Ve - !l
Extremely - Ex
Fine F
ediurr~ -
~> - veneralized range of infiltration rates from SC; soil survey {~X>)
FSP -Estimated Field Saturated Percolation rate based on horizon specific
factors.
I t I I T T
rairie laz
Test gate ~~~2
alete B illiam Parnell, l~.E.
PE Jab #t361 QO
l~t1LE RING IFIL.T TIQ TEST
Test Hale 1 (test run 7" below existing ground surface ~
Mart Sta Ela sed Tune Total Dra lrafiltratian Rate
( in) (
n)
i { in (inches } (ln1r )
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