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Vortechs Inspection • • <br /> Vortech Model: Location: <br /> Water Floatable Describe <br /> Date depth to Layer Maintenance Maintenance Comments <br /> sediment' Thicknessz Performed Personnel <br /> 1. The water depth to sediment is determined by taking two measurements with a stadia rod:one measurement from the manhole opening to <br /> the top of the sediment pile and the other from the manhole opening to the water surface. If the difference between these measurements is <br /> less than eighteen inches the system should be cleaned out. Note:To avoid underestimating the volume of sediment in the chamber,the <br /> measuring device must be carefully lowered to the top of the sediment pile. <br /> 2. For optimum performance,the system should be cleaned out when the floating hydrocarbon layer accumulates to an appreciable thickness. In <br /> the event of an oil spill,the system should be cleaned immediately. <br /> 7 <br />