20120312 Peer STEP Sizing Cmts 02262013 �.
SEWER STEP TANK SIZING
PRO7ECT: Yelm McDonaid's Addition
PROJECT NO.: 1815.01
DATE: 1/14/2013
The sizing calculations below have been based on the following information:
• The Washington State DOE Criteria of Sewer Works Design
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• City of Yelm Development Guidelines "7�� �,T
• Water Use Records from City of Yelm �� �`�,S ..�
McDonald's located at 505 Yelm Avenue West currently uses 207 Cubic et a day. �-1���_�j�
(based on attached water records) +� '"�/
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• Ex. Daily Water Use: 207 Cubic Feet �
• Increase Water Use by 32% (827 s.f. Addtion) 273 Cubic Feet
• Daily Water Use: � -- 2042 Gallons
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� ^ 'Using the above information the calculations from the DOE manual c be solved. � � �3
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'Z- • Detention Volume from Pg CS-32 �i 7���,
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V = (2.0) Q "f
Q=Peak Daily Flow �O 2042 Gallons �� n�--I
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Non Resid. Strength = 2.0 •/ J Z
V=Liquid Volume � 4084 Gallons �j��� ^�I
• Working Volume from Pg C1-32 `,
• Working Volume is defined as the difference between the peak inflow and
pumps ability to keep up with the flow.
��'""� ��'�- • O.S. 20 GPM duplex pump system will be installed in the new second tank. It has
(�,�1� �;���, `the ability to convey 1,200 GPH. The pump will be capable of conveying the whole
� daily flow in less than 4 hours. This pumps flow is substantially higher than the
actual. All duplex systems are required to have OSI 20 pumps
•The standard City of Yelm float settings should be used (5.0") �'
• Emergency Power Outage Storage Volume from Pg C1-32
• 24 hours of additional storage volume is required.✓
• 2042 gallons have been included. �
• City of Yelm requires a transfer switch and generator connection to be �
installed. Refer to Sewer Addendum notes for type and model info.
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Tank Sizing Summary
Based on standard concrete 3,000 gallon step tank 84" in depth
Standard tank contains 35.71 gallons per 1" of storage.
STEP Tank Detention:
• Required Detention Volume 4084 Gallons '�
• Ex first 3000 gallon tank outflow pipe at 65" from bottom 2321 Gallons 4�
• New second 3000 gallon tank pumped at 50" from bottom 1786 Gallons ✓
• Total Detention Provided 4307 Gallons✓
• Additional Detention Volume Provided 23 Gallons ✓
STEP Tank Detention:
• Required Working Volume (5") 179 Galions✓
°.��, Elev 50" to 55"> :��� �� ��.
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Emergency Tank Storage (Elevation 55" to 84"): ��
• Required Emergency Volume 2042 Galions �/
• Emergency Volume Provided in Ex First Tank 678 Gallons �'
(84" - 65") * 35.71
• Emergency Volume Provided in Ex First Tank Risers
n(1')2*4' * 7.48 gal/ft3 94 Gallons✓'
rr(1.25')2*4' * 7.48 gal/ft3 147 Gal�ons.,�
• Emergency Volume Provided in Second Tank 1036 Gallons ✓
(84" - 55") * 35.71
• Emergency Volume Provided in Ex First Tank Risers
rr(1')2*4' * 7.48 gal/ft3 94 Gallons✓
rr(1.25')2*4' * 7.48 gal/ft3 147 Gallons✓
• Emergency Volume Provided 2196 Gallons,,,--
Total Tank Volume
• Detention Provided 4107 Gallons �
• Working Volume � 179 Gallons •/
• Emergency Volume � 2196 Gallons✓
6481 Gallons�
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10l19/2012 12:21 FAX 3604584348 CITYOFYELM (�002/002
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Account Number-0�-0261-02 NBO ENTERPRISES INC Service Address; 505 YELM AVE W
Service: �04 005 COMMERCIAL IN 1 Meter 21Q593068
, ' � Read' Total ' ' demar�d � Readfng
MoMh Date f'revlaus• Curr,ent � ConsumptlQn � Read Consumptlon Fleg SourCe Oocuparrt
Year;2012 Total 8
Sep 09130/2Q12 174370 124950 580d Regul�t Hand Held q2
' Aug� 08l31J2012 123700 124370 6700 Re�gula� Hand Ho�d 02
Jul 07131l2012 12�030 123700 6700 Regular Hand Held 02
Jun 06/80/2012 122480 123030 5700 Regular Hand Meld 02
May 05131/2012 121895 122460 5650 Regular Hand Held U2
Apr 04C30l2012 12125Q 121895 8450 Regu�ar Hand Held 02
Mer 03/9112012 1Z0690 121250 5600 Regular Hand Held 02
Feb 02/29/2012 12QO�t5 12069b 845Q Reguler Hand H�Id p7
J8n 01/31/2012 119470 124048 5750 Reguisr Hand Held 02
Year;2011 Totai 3
Oec 12/31/2011 11891U 919470 5800 Regular Hand Heid 02
Nov 11/30/2011 118190 118910 7200 Regutar Nand He�d 02
OCt 10l3112011 117515 118190 6750 Regular Hsnd Neld 42
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