20100129 STEP Report 05132011C®I~iVIIINI'T~' S~~TIC'PE41i'~ ~FF`~iJ~+IV`~'
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November 2010
Revised R9xv 207 H
Trep~nred lim~:
America's GeeEit Oman
P.t-. BvX 33338
Fort tiewis, W A 9$433
Prepared Iiy:
Jacqueline A. Byron, P.E., t3esign E,nginecr
Kathleen M. Byron, P,E., Design Cngineer
~4pproved Ry:
Timothy O. Hotderman, P.G., Principal
2EPQR'r ff1Q7b4.10
T1iis enel}su & based on dsre snd mends either supplied eo, ns nb-~xinea by, Somd Fngineedny,
ine 16ese documaits ace riercnccd wi U.hi the iuiaRhe ennlyete_This analysis has brev
pmymed mitizing procalnres xeA pcxenec+s wirt•in Ae standned aceepmd oractiws nfthe industry.
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'!'ABLG d7P C6b`TCNTS
Page
10 Project Descnpt on _...... _...._ ..... __._.t
2.0 SS.E.P. TanhSnN _...._. _._.... ....__.
30 PumP.._..._ _.__.. ......... __..
4.0 Sewer Lines ...._ __.. _. ..._._ .........._.3
4.1 Gravity Side Sewcr _...... .. ___._3
4.2 Service Line _._._. ......._ ____ . .............4
5.0 Grease leteaeptc __._.. ....._ _.__ .........4
Agpend~sA Gmwal lslribin
d-1 ViclrzGy bfap
d-1 Axsen'or~!LG~
AppenAisd S.T.LP. System Cutculxtions and Tank Data
Apperzdix C Yimrp Momdlemrm~ Defaila
4A PROJECT DESCRIPTION
Tha proposed project is located et 416 East Yelm Avenua, Yelm WA, 98682 (parcel #
22?19332800)_ The site Is Iccafed on fhe sopth side of Yelm Avenue and inelutles a
total area of 38,045 square Feet (0.?82 acres). The proposal s fo construct a 4,380
square foot building housigq a credit union along with a coffee house (a possible Future
addition).
Tha proposed project will coneact o gravity sanitary side se~mer to a STEP tank with the
effluent from the tank pumped into [he existing pressure se~mer main in Yelm Avenue.
The STEP system was deskgnetl following the City of Yelm Oevalcpment Guidelines
(YDG) and the DOE "Cfitena for Sewage Works Design" (herein known ae the DOE
Manual in this document).
Per the Gity of Yelm specifications, the STEP tank shall pro~lde 24 hours of storage
volume In fns tank as well as a power transfer switch with an emergency generator plug
in case of power outages.
2.d S.LE.F. TANK S¢wc
The sizing for (he STEP Tank system is In accordance with the Ctry of Yelm
6evelopment Guidelines- According to the DOE Manual, section C1 ?0.1.6F, the tanks
must include Detention Voume, Working Volume, and Storage Volume.
Detention Volums Is defned ae the volume From the boIIOm of the tank tc the lead
pump "efP postfien, or Dasicehy the wet pool volume ai the tank. Per the DOE Manual
(C?-?0?.63), the tle[anNon volume er !igvid volume of a STEP tank [ha[ serves a
single-family home or smz11 business must egcal at least 950 gallons. For tanks that
serve stmdpres wHD bigger wastewater discharge volumes, the reyuleed volume is 1.6
Gmea the aveage daily flow for residential and 2 times the average daily 41ow for
commercial. The larger of these two volumes (950 gallons and 2 x average daily flow)
was selected for the detention volume.
Working Volume ie defined as the volume befween the pump "on" and pump "off'
positions and shall be greater than the difference between the peak influent flow and
the discharge of the STEP or gnntler pump over 15 minutes (peak flow dumfion).
Storage Volume is defined as the volume between the pump'of(" pos3ion and the top
of the tank. It shall be equal to or greater than the average dally low volume. Sae
Appendix 8 for calculations.
2.1 Credit Union
The Credit Union portion of the building will consist of a lobby, teller area, two offices, a
break room, two restrooms, a Jantter's room, a mechanical room, and e vault. For
determining the daily flow, only [he oooupanoies for the teller area and offices will be
considered. These are listed in [hatable below:
Credit Union
Area Occupants
Office (111) 1.2
Office (112) t.6
Tellers 83
To[ai 11.1
According to YOG Chep[er ], Table 2, the esilmatetl deify sewer flow for office workees
(perahlft)is l5 gallons. See Appendlx6 for wloulatlons.
2.2 COf}ee {j01]Se
The STEP tank has been sized considering the fu[:rte coffee house poriion of the
building. This will consist of a benste area and a customer (saefing) area- The
occupancies for these areas are shown below:
Coffee House
Area Occupants
Harista 1.7
Seating 4g.5
Total 42 2
VDG Table 2 does not cover establisbmenis which mainly serve beverages, such as
coffee houses. Therefore, the following assumptions were made 4or the seating and
barista areas: For the seating area, the ebsest matcH in VDG Table 21s"Restaurants
addfional for bare and oocmaii lounges" j2 gallons/person/day). Porcalculating the
average daily flow, the cusierner count is assumed to be three times the occupancy of
the sealing area (3 x 40.5= 1215). For the bensta area the estmated daily sewer
listed for ofFlCe workers (S gallons) is conservaGVely assumed. Ses Appendix B (or
calculations-
3.0 Puma
For STEP tanks 1500 gallons or less, a simplex pump system can be used (YDG
1F.020). However, since this system is for a commercial building, a 20 gpm pump will
bs regwrad. The Orenw Model P20 05 11 pump or approved equal (capable of
Ueltvering 20 gpm against a TDH of 105' and with a shutoff head of nol less then 560
ehall be Installed. The working vclume required is the volume bom the pump OFF
position to the pump ON position, and shall be 5reatar than the tliHerence between the
peak lofluent flow end the discharge of the STEF over a pericd o! Itma estimated to be
the peak duration whioh Is i5 minutes (DOE Manual Ci-10_L6C). See Appendix B for
working volume calatlaiions.
4.0 SEW ER LINES
A gravity side sewer conveys flow from tyre cleanout to the STEP'fank. A service lino
conveys flaw to the force main in Yelm Avenue. Connection to the torte main will be via
an existing sYUb-aut located on the lot northwest of the proposed pro)act lot This stud
out will be converted to a double service connection (city of Yelm detail ]-2) In order to
bring a service line to the credit unloa
4.1 Gravity Sitle Sewer
The side sewer pipe size well be 6" per the Yeim standards
4.2 Service lines
The service Me wlll be 1" is tllerneler from iha STEP tank le the tlouble service
connectloo, then 2"in tliameter from the service conneciiao to [he force main in Yelm
Avenue.
S.O GREASE INTERCEPTOR
Since Iha coNee house is a poasble future addifion, the grease interceptor has not
bean sized at this lime. A grease interceptor stub has been spaciFed along with
adequate space to allow for the irutalfa6on of a grease interceptor if it fs raqu!rad (see
sheet C4 of the eonstnction plans).
t~Pt'E~Y~I%.~
General Exhibits
Project: America's Credit Union Yeim Branch
~acatian: 495 E Yeim Ave, Yeim 4'VA
Vicinity dap
Project: America's Credit Union Yelm Branch
Location: 4i5 E Yelm Ave, Yelm VtlA
Access®r'S ~agJ
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S.T.EP. System Calculations and Tank Data
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Eoeryre¢n Pv¢-0d5t t500 Gdllon STEP Tank
I(wMe tlimaosions:
BoHOm length Li 135
BOltom wtllh, W1 56
Top legglh, L2 139
TOp viitllM1. W2 59
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Tank helg$fi 59 In
V(Ip1¢I~ t91B gel
Uepth (in) Vigell tleyM Qn) V(yap tl¢ptM1 (in1 V(ga11
0.5 l0 15.5 494 J45 986
t0 91 16.0 519 3'I0 1661
t5 4] 16.5 52F 31.5 1058
2.0 65 iZ0 542 32.0 iW5
25 ]9 +.15 555 325 1051
6.6 95 1C0 6]6 56- 3B8
3.6 110 1B 5 59t 3tln '1004
69 126 190 56] ]40 1101
4.5 t42 19.5 624 345 11te
59 t58 200 646 3fi0 1136
5.5 P4 205 f56 965 1151
6.0 190 210 6R 96.0 1166
b'6 295 2t5 069 9C.5 1105
zu 2n 2zy ]95 w.9 1291
]5 23] 225 921 ]].5 1218
80 25! 2d.0 ]38 360 1295
B.5 2fi9 235 ]54 30,5 1252
90 285 240 ]]0 390 1259
9'0 301 2a.5 ]6] 365 1265
10.0 31Y 250 863 066 1'v02
105 3J3 YE.S 820 906 t9i9
110 349 2fiG 836 4..6 1338
t 1.5 365 26.5 055 41.5 1353
t26 901 2].0 880 e20 iS]0
12.6 3W 2] 5 066 421 136'!
19.0 9t3 286 592 436 1404
155 4P3 206 919 435 1421
1 <.0 445 29.9 995 44.6 143]
^.45 462 295 952 64.6 1454
t66 4]6 300 Job 45.0 14]t
tlePm On) V19a1)
455 146b
469 1665
463 1522
4)C 1590
4Z5 i5A
46.0 15]4
4d5 1591
49.C i6C0
095 1625
SCO 1642
50.5 1659
510 16]6
51 5 1699
5m nn
526 1]2b
536 1]45
535 1Ifi2
s46 neo
505 i]9]
55.0 1816
555 1831
56U 1849
5G 5 1666
59.0 1883
5]5 1901
586 1919
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Pump NlanufacPurer Details
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Um submergble Nigh-Heatl Etlluznl PUmps are tlesign¢tl [p
Vansport naa eiMentlwiUr law iSS copntsfm~n sepria
ranks of saps era tlosing tanks Pll our pampa a2 coestruoted
sl lighrweigM, csrrosion-resistanatainleu 9eelandengi-
erea plaseas an era Bala-aaruiceaele m,a reyalrzbm wan
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CSA canifieam Ma LL5. antl Canatlian sefary stanaaNS br
eHlvenr pumps. mee0ng pi repuiremeo6.
Urancoi N10M1'Neetl ENluonr Pemps are nseU In a vanely of
applreaaons, inclutlin9 Vresmrlietl tlraicfieldi, packed batl rib
tars,mounds. aemblc msds. eiflverelmgati ,eiAUenr sewau.
we0enas, leACOnS. antl more. These pumps are tlesignetl ra Fe
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• Minimum Yb~bpu un-0.ry capaMliry with n9 drtericrericn in
pumplHe or parformancs`
• I(S-inch tYmm bypass onfce lpaterM1 penain9l ro sitsara
Ilow reairculafion br motor coolinA and to prevent nit bintl
• Ggliia ana repaFkhs avalla4le Nr hener lsngierm csxru
mship
• tfILSEAL^"Aoating Impeller desiyn pn tU, EA-, antl 34gpm
models: rloaauy stack desige on SA-gpm mpdek
• saner sramlesx EanaAn Elaao-m momr, ratan mrxnmmooax
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