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69 !1k l <br /> February 18,1981 sj1 <br /> WORKSHOP-SEWER LAGOON 11k <br /> pw orksho convened at 3:45 p.m. to review the status end , ;. <br /> recommendationsnv <br /> or the wastewater treatment plant expansion, <br /> sludge management pw <br /> plan and combined sewer overflows. All <br /> un ilmembers w lattendance except for Councilman Stephenson _.)¢, <br /> who arrived at 4:30 p.m. 4 <br /> I <br /> Tam Thetford,Project Manager for the Citygave a brief outline of <br /> the presentation which will include status reports on the It <br /> wastewater treatment plant expansion, sludge management plan and til <br /> combined sewer overflows. - @ I� <br /> Bill Persich, from the consulting firm of Brown and Caldwell, ik <br /> reviewed the existing wastewater treatment plant end the different <br /> options available for expansion which will meet the compliance tl <br /> '4.1 <br /> schedule as set by the Washington State Department of Ecology. <br /> The Wastewater Advisory Committee offered several recommendations ,R <br /> s to the directions the City of Everett should take in resolving <br /> its existing and future wastewater treatment needs. The City and a q , <br /> Brown and Caldwell undertook a pilot study t fully investigate the <br /> technical Pea ibilitof the aerated rearm/solids contact (AL/SC) <br /> rocess whichwasthby the committee. he work <br /> o4 the �I <br /> study Indicated sthe the AL/SC p would t without the <br /> o f chemicals and the thei and p control implications I ,I,I <br /> of chemical additions led City and'Oroe Caldwell to { <br /> evaluate means of mechanical treatment. 14 <br /> Mr..P 1 stated the most practical f the alternative forms of { <br /> mechanical'treatment appeared t b trickling filter/solids 1II14I <br /> contact (TF/SC) process. A pilot program of this process is I` <br /> underway to establish the technical specifications of a TF/SCI• <br /> echanical treatment faC111Ly to treat the City's testewater <br /> th <br /> and woo 2025. This alternative would.have a monthlym rate e4 risk <br /> ii, <br /> �!nd w ultl use the least amount of acreage with a otlexate risk hh <br /> factor. pp <br /> Mr.Thetford reviewed the sludge management plan which Will provide 4,, <br /> for sludge removal, permitted sites and compliance requirements. <br /> The City did r quest a time extension due to the difficulties in l' <br /> timer extension lend thetene r e fox the term removal sludge. <br /> ludgeEPto denied permitted <br /> 'Ii <br /> rtes is being pursued near <br /> WhatcomCounty, King County, Pierce • <br /> County and Mason County. Mx. Thetford stated that the City is I�l�.i <br /> still pursuing be getting local Snohomish County sites approved but <br /> those 111 be for the long term removal of sludge. ! <br /> 6 <br /> Mr. Thetford stated that preliminary estimates are <br /> w being made VI <br /> o4 combined's overflows reduction benefits. n this case, 1I 1,j <br /> "benefits" means the ability of an alternative to reduce the }I f <br /> f relative (also <br /> ts.volume <br /> a and consultant team) of estimatesflows that Por the least . <br /> pp approximately III!1 <br /> 100-200 million gallons soverflows each year from the oath End ' <br /> Combind sewer system. The Department of Ecology's draft Combined <br /> Sewer Control regulations state the SO freuency must ultimatelyy I I <br /> be reduced to one vent per year ateach outfall. In order Il <br /> achieve this goal,event <br /> City ill eed to implement significant j.-r <br /> capital improvements to the North End sewer system. 5 <br /> Claire Olivers,Utilities Supervisor,stated the siting of the Navy <br /> Homeyort in Everett does not have an impact on any of the <br /> improvements reviewed. The Navy will be only 2% of the City's <br /> total capacity. These improvements are necessary whether the Navy dl � <br /> Homeport is based in Everett or elsewhere. <br /> The workshop recessed at 5:00 p.m. )' <br /> 4y` <br /> x,% <br />