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October 6, 20x9 <br />Rebecca ~-~aug <br />Environmental Administrator <br />City of Ells River <br />:~ ~~U6] Orono Parkway <br />Elk River, MN 55330 <br />Re~~~~ F~ oCJ 1 <br />77009 <br />RE. Great River Energy OGRE} proposal to feed Tire Derived Fuel TDF' at the Ells River <br />~ ~ <br />Station <br />Dear Rebecca; <br />Lie~ch A~ssr~ciates,~inc. has reviewed the refe:rcnced propas~l; the e~istin~~ air emissic~:r~s ermit <br />b p <br />for the Elk. ~Pa.ver. Station, andrecent test burn ~an~lytic~ll data-~~~_r~~vided b ~.CrR.E~ ~ 1n ~A~c~itian a <br />. Y , <br />meeting v~rith~CrRE~representat~ves ~~as~~attended~~to'discuss tl~e~propbsal~~and test burn ~re~u:~.ts i.n <br />. <br />more etazl on ~epte 1 y 2009 ~ ...., ' :.~ . ... ....~ ~ ~ :. ~ - . <br />m.ber.2 -a .y <br />,. <br />. .. - <br />The existing air emissions pe~~xr~it issued by the l~1in~~esata Pollution Control A enc NIPCA <br />g y~ } <br />dated July 1, 200$ allows for the use of T'DF gas ~: fuelinput at a rate not'to exceed 200 tans er <br />p <br />day ~tpd} in any 24~laour period and 100 tpd on a 3 0-day rollin avers e, <br />g g <br />TDF is proposed to be delivered in covered trailers, off loaded and stored in the existin RDF <br />g <br />building. ~t will be conveyed to the power station using the existin RDF covered conve ar <br />g Y <br />system, Ash from the boilers w~11 lie removed and disposed of at floe current ash land~~ll in <br />Becker. No changes in the curz~ent air pollution control systems are ~•o osed. <br />.p p <br />A test burn of a RDFITDF mixture was conducted an Au <br />gust 10-13, 200. Interpall <br />Laboratories, Inc. conducted the testing and ~a.nalytical work. Ash and air emissions anal ses <br />y <br />were completed. TDF was fed at rates from 85-165 tpd but at a~a average rate of 135 t d over <br />the last three da sand : ~~ o p <br />y up to apprc~xzm;ately .~0 !o of the total bailer fuel feed by weight. <br />Ash testing for metals vacs conducted on fly and canlbined fly and bottom ash. A sam le of <br />p <br />TDF itself was als~i~analVZed far metals. l:n additi~~n, an asl~ sample was anal zed using the <br />TCL ~ y b <br />P~procedure,to determine~if.~TDF uro~~ld ~hange~theAt~xicity~o~'tl~e ash cousin itto~l~~. <br />g <br />regulated a~ ashazardous w~~te~. 'The results o~~ the ash ~analy~]es did -not- enerall show an <br />g y y <br />significant changes to previous RDF ash chara.c~teristic~s or %axicit T levels of metals: An <br />y <br />exception ~s zinc, which was present at approxi:~~aa~tely twice the previous avers e ash <br />g <br />concentration from 19~ 1-2008}, The TDF feedstock has steel belting remnants resent anal is <br />p <br />believed to be a likely source of the zinc in the asla. <br />www.li~sch.eam <br />L.~E$CN AS50CIATES, INC, ~ ~ ~4a~ ~ STN AVENUE N~RTN ~ MINNEAPOLIS, ~`'~~ 5544 ~ ~ 7~~~~}8g-~ ~ ~Q ~ SAX; ~~3~~$9-~ 1 Q ~ <br />