Laserfiche WebLink
PENSKE TRUCK LEASING <br />SANITARY SEWER PUMP CALCULATIONS <br />1.0 PROJECT SUMMARY <br />This project proposes the construction of a new building, together with associated utilities and parking <br />and driving surfaces, to support a new leasing site for Penske trucks. A new sanitary sewer pumping station <br />will serve the proposed building, due to the relatively flat nature of the site, together with the elevation <br />' of the existing pressurized City sewer main within the adjacent right-of-way. Based on the calculations <br />and assumptions outlined herein, an E-One Pump Station Model DX152 will sufficiently serve the <br />proposed building. <br />2.0 PEAK FLOW FROM BUILDING <br />The proposed sanitary sewer pump station will need to pump (at a minimum) the anticipated peak flow <br />from the building. <br />' Q = (d * CAP) * PF <br />Where: <br />Q = design flow (gpd) <br />d = average day demand (gpppd) = 20 gpppd <br />CAP = expected instantaneous capacity = 20 people <br />PF = peaking factor = 4.0 <br />For design flow: <br />Q = (20 * 20) * 4.0 = 400 * 4.0 = 1,600 gpd 1 <br />' For total daily flow: <br />1,600 gallons <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Q 8 hour day <br />1 hour _ <br />x 60 minutes 3.3 gpm <br />Given the pressure in the main at the point of connection is 22 psi2, the proposed E-One Pump station <br />will pump at a rate of 11.8 gpm. Therefore, the proposed pump station will adequately serve the <br />proposed building. <br />1 This is significantly greater (more conservative than) the mechanical / plumbing engineer's estimate of 91.5 gallons per day. <br />Reference attached email correspondence. <br />2 Based on email correspondence with Amie Roshak, P.E. with the City of Everett, the operating pressure is in the range of 15- <br />22 psi. The design conservatively assumes the upper limit. Reference attached email correspondence. <br />SITTS & HILL ENGINEERS, INC. <br />TACOMA, WASHINGTON <br />