3721 OAKES AVE EVERETT SCHOOL DISTRICT 2021-11-15

Ili 110 • ...... D.ci Ltae- eve. it n ' ...-i e-.) tu. 6 11 1111111111IIIIII NMI NOV - 5 2020OM IIIIIII EnGlnEERS memorandum CITY OF EVERETT Permit Services DATE: May 26, 2020 JOB#: 20011-0111 TO: Andy Hall CC: f FROM: Craig Stainer �``� // SUBJECT: Everett High Scf ool Athletic Building HVAC Replacements This is concerning the proposed replacement of HVAC units within the existing building located at 3721 Oakes Avenue, Everett Washington. These new units will be located in existing mechanical rooms, and based on existing building drawings the floor framing for these mechanical rooms was designed for a live load of 75 PSF. DCI Engineers performed calculations of the existing floor framing and found that in the three mechanical rooms where the EVR-1, EVR-2 and EVR-3 units will be located the allowable uniform mechanical loading was a minimum of 75 PSF. See attached calculations. Two new large replacement mechanical units are planned for the two main existing 2nd floor mechanical rooms. These units are named EVR-1 and EVR-2. EVR-1 has a weight of 8,352 pounds with plan dimensions of roughly 6'x 16'.This creates a uniform loading to the floor of 87 PSF. But with sleepers added to increase the length of the unit to 19'the uniform loading is 73 PSF. See attached calculations. EVR-2 has a weight of 11,328 pounds with plan dimensions of roughly 7'-8"x 17'. This creates a uniform loading to the floor joists of 87 PSF. The existing floor joists and beams in this area were checked and found to be capable of supporting an 87 PSF mechanical load. See attached calculations. Based on our review,the proposed EVR-1 and EVR-2 can be installed without any retrofit to the existing structure. The new unit connections and sleeper requirements are shown in SSK-01 and SSK-02, attached. Other small equipment and ducting will also be added. These items are less than 150 pounds, so no specific design checks have been performed by DCI Engineers. Another unit, labeled as EVR-3 will be installed in a mechanical loft located between grids 6.7 and 8. The EVR-3 has a weight of 268 pounds with a footprint of 5'-6"x 4'-9"for a distributed load of 10.25 PSF which is much less than the allowed 75 PSF floor design load. All these items can be installed with typical connections to the structure. Please contact this office with any questions concerning this matter. ��\,E L• J 1 r .... 3>, 47670 ,c'S ; k11. F ��; "S7ONAL 14V) 818 Stewart Street.Suite 1000!Seattle.Washington.98101 Phone(206)332-1900 Service Innovation Value