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IVIG <br />TAP <br />EXHIBIT F> <br />Understanding Floor Drain Systems <br />MnntsotaliR:hnicBAssistinct Precram ■ FACTSHEET< <br />Bask utilities usually are not thought about until <br />a problem anset. Plumbing systems typically <br />hmetion for many years without needing <br />attention. ‘Ibis fact sheet gives tips on <br />prevenUi^ piuaibing problems. It focuses on <br />aesver traps (separators) and inclxides basic <br />Infocmalion and simple maintenance ideas. <br />Maiqr buildinp have floor liench systemic Boor <br />drains, or vrash aitd service boy areas whidi <br />allow liquids to drain away Ihe Mirmesota <br />Plumbing Code provides specifications for <br />constructeg and Instdiing separators in these <br />buildlnp. These devioas separate artd collect <br />flammable aiul oily waste horn wastewater <br />before it enters the muiddpal sewer system. The <br />code applies to any busing location where <br />flammable or oily liquid wastes are produced— <br />including: <br />1) encloa^ over 1,000 sqxiare feet; <br />2) vehicle maintenance or washing operations, or <br />3) garages h. ’.sing more than four vehicles. <br />NOTE: Buildings not connected to a mu.*'.idpal <br />sewer system generally use on-site wastewater <br />treatment stich as a septic system, drainfield or <br />drywell. ConUct the MiiuiesoU Pollution <br />Control Agency (MPCA) at 612/297-7574 or 800/ <br />657-3864 for fact sheets and information on <br />regulatory requirements for discharging into <br />these kin^ of systems. Generali}; businesses <br />%rith on-site systems are permitted very limited <br />discharge. <br />How «• SiiMrttirt WUrk?__________ <br />A separator uses gravity to separate liquids that <br />float (like oils, fu^ and other petroleum <br />products) and problem wastes (like sard and <br />sludge) tern wastewater before it enters a sewee. <br />When waste%vater collects in Ihe separatot <br />petroleum products collect on top ^ heavy <br />materials settle to the bottom. Thewaleris <br />discharged at a height beturttn the outlet and <br />iiOet pipes. <br />If a separator is not used, petroleum products <br />could accumulate in a sewer system, which <br />could result in a high concentration of explosive <br />vapors in the sewer. Or the petroleum wastes or <br />other solids could plug the sewer. <br />Why lUaliitiln Sepiratort?_________ <br />Sooner or later, too much oil and/or sludge <br />accumulates in the sewer trap, causing <br />contaminants to discharge «vith the wastewater <br />or plug dw sewer trap outlet When this <br />happerts, you have problems, such as full floor <br />tieiches, badicd up sesver discharge or <br />authorities investigating contaminant sources. <br />To fix dtis problem, you %vill need to: 1) identify <br />the separator locatioiu 2) assess the problem aiul <br />prob:^ly hire a dean out service, and 3) arrange <br />for proper diyosal. <br />(emtmmi) <br />W W • WMIM iw*-w MI <br />amwaitMUiQa <br />I a w uwvii» X umm <br />. aMOlvyORMWI <br />MnTAP • 1313 50) SOMtSC. Sell 207 • Mirxeapois, • Minnesota 55414-4504 <br />612/627^646 • 800/247-0015 (Iflnnuctaorty) • MX 612 627-4769