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Vurlechs Slorm�v�lcr_lre�tmenL SYstem <br /> Vortechsm System Removal Efficiencies <br /> for Selected Partfcle GradaHons <br /> 100% � -- - <br /> 90°/a . <br /> 0 80% ;— _— _ . — _ <br /> �, 70% i . . . _ ___ . . . .. ..-'------li <br /> u <br /> v 60u� � . . . . _ .__. _. ____ _—__— ' <br /> � 50°k �- - --- — -� <br /> � 40°/u I . . .. ._ . <br /> > � <br /> � 30% i . _ __ .. _ . _ ____ _ . <br /> E <br /> � 20% � --� - -------- ---� <br /> 10% I- - — — <br /> 0% . . . , - • � ' - --- --`- -_ � <br /> 0 10 2C 30 40 50 60 70 <br /> OperaUng Ra[e(Lpm/m') <br /> �-50 micron �FTypital Gradatlon t 150 mltron <br /> . See Table 1 <br /> These perFormance curves are based on laboratory tests using a full scale Vortechsd System Model <br /> 2000. The [esting protocol used is des�:ribed on the following pages. The 150-micron curve <br /> demonstrates the results of tes!s using particles that passed through a 100-mesh sieve and were <br /> re!ained on a 150-mesh sieve. The 50-micron curve is based on tes[s of particles passing through <br /> a 200-mesh sieve and retained on a 400�mesh sieve. A slurry representing an average stormwater <br /> sediment gradation, with the particle size gredatlon shown in Table 1, was also tested In our <br /> laboretory. <br /> As [he graph clearly shov�s, Vortechsm Systems maintain positive total suspended solids (TSS) <br /> removal efflciencies over the rull range of operating rates, allowing the System to effectively treat <br /> all runoff from large infreyuent design s[orms as well as runoff from the more frequent low <br /> Intensity stor�ns. Precasl Vortechs� Systems are designed to treat peak Flows From 1.6 cfs (0.045 <br /> cros) up to 25 cfs (0.707 cros) without bypassing. Peak fluws that exceP� ��ted treatment <br /> capacities can be conveyed around the System with an external bypase.. Internal bypasses can be <br /> configured to dlrect low flows from the last chamber of the Vortechsm System to polishing <br /> treatment when more stringent water quality standards are imposed. In all configurations, high <br /> removal efficiencies are achieved during the lower intensity storms, which constitute the majority <br /> of annual ralnfall volume. <br /> Rev a-z9-oa �ws�) <br />