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DYE D[LUTION <br />A method of ineasuring instantaneous flow which consists of injecting a known quantity <br />of dye into the system and computing the concentration of dye downstream. The more <br />diluted the concentration is the greater the flow quantity. <br />DYE TESTING <br />A rainfall simulation technique used to more accurately locate and quantify inflow <br />sources identified during smoke testing. The method is typically used on storm system <br />sections, ditch sections, stream sections, and on potential mainline defects. Possible <br />leaks are flooded with dye in order to simulate a storm event whereby the manhole <br />immediately downstream is observed for evidence of dye. This can also be performed <br />during a storm event and is normally done in conjunction with TV TESTING. <br />EVIDENCE <br />It is not always possible to observe a DEFECT to be actually leaking. However, stains, <br />mud, mineral deposits, sand, etc., may indicate that a DEFECT will leak under <br />appropriate conditions. These conditions aze considered to be evidence. <br />EXTRANEOUS <br />Another term for UI. It describes extra flow other than domestic sewage that enters a <br />sanitary collection system through leaking DEFECTS. <br />FLOW ISOLATION <br />The process by which SUB-BASIN INFILTRATION is "isolated" within a smaller <br />portion of the sanitary collection system. Its purpose is to identify portions of the <br />collection system subject to possibly excessive infiltration, typically, in order to <br />designate lines needing subsequent cleaning and internal television inspection. This is <br />accomplished by measuring flow during periods of minimum sewage contribution <br />normally between midnight and 6:00 AM with WEIRS, at one point in time, and <br />subtracting any upstream contribution. <br />ADS Environmental Services, Inc. <br />VI-2 <br />