1402 SE EVERETT MALL WAY MR BILLS 2018-01-01 MF Import

01-04-1993 �4:lOPM Dccember 1S, 1992 Mr. Tim Tyler City of Everett Buildiag Department 3200 Cedar 5t. Everett, WA 95201 FROM Rar�vark eng TO A.��'ARK ENGINEERING SEit�i[Cr,$, � 19730 64th Ave. W, Saite 3?.5 Lynnwood, Washiagton 98U36 (206) 672-7031 RE: Mr� Bill's, Eve:rett N;all Dear Tim: � �Ilt� ��16�v � W � �� vZ �� 53 �,_ ' ' I � 259885E P.02 � �u.�. � -- Thank you for your time Wednesday, I think :he time spent was worthwhile in providing !�oth paxties with valuable information coucerning grease trap problems and solutions. I uadcrstand Jeff's coaceras of di6charge of grease into the City s:wers. lt is an important problem and otte of which al! lesign professionala and rutaurant operators need to become awaze. We discussed the problems which we would eacoun[er if we were to use the existing grease 3ntercep[Or installed near thc north entrance ot the mall. We would have to oxtead our grease lines 225 feet to connect to the existing grease lines. This wonld uot work, ia ihat the grease would congeal in the coldcr piping: As you [uld me in the meeGng, the iadustry standard is a masimum of 100 fee[ of greace liae to thc iatake of an intcrezptor, any longer thaa Wat riska cloggiug the piping. I would not consider x 100 feet distance un;ess there were a large enough flnw to easure that the piping scours itself. My prefessioual opinioa is thal 100 teet ia rcally too far to draia grease except in a large iustitntional applicalloa. R'e discussed the possibili[y of placing a new exteriar interceptor at the entrance nearest the new res[aurant. The lenglh ot waste piping is I04 feet to t6e exterior wall of the mall. To extcnd out past the sidewalk to tLe parking lot wi11 add another 8 to 10 fect making the total leug[h 112-114 feet from the sourcc of grease laden wasle. Agnia, this is mcc6 too far, eapecially considering only a 3 comparlmenl sink ia lhC SourCe of tLe grease. We discussed some other altematives that could prevent the problems of gr:ase laden wastes reaching the City sewer;. One method was ta usc automatic or seiai-automa[ic grease traps. TLese types of trapa enable tEa operttlor lv remuve grease from t6e trap without removing the cover plate. Both !ypcs wurk wcll, �ut still require periodic disassembly and cleaning. The automatic "big dipper" model which we talked abuuc briefly uses an electrie heater, motor and timer. After looking at additiounl information from the manufacturer, my professional opinion is that cleaning this type of gredse [rap would'require a highcr lcvcl of mochanieal und electrical aptitude than ro maintain an ordin3ry greasa trap. Also, iI lLe lrap wer� not monit�ted constantly, an electrical or mechanical walfunction would immediately cxuse grease laden water to cntcr the sewer. I don't have a high degree of confidence in mechsnical or electrical equipment operating in an environment of grease �aden water: There are simply more things thal might go wrong.