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CDS Inspection & Maintenance Log <br /> CDS Model: Location: <br /> • <br /> Water Floatable Describe <br /> Maintenance <br /> Date depth to Layer Maintenance Comments <br /> sediment' Thickness? Performed Personnel <br /> 1 . <br /> 1. The water depth to sedimenris determined by taking two measurements with a stadia rod one measurement from the manhole opening to <br /> the top,of the sediment pile anc the cattier from the manhole opening to t-ie water surface,If the dfference between these measurements is <br /> less than eighteen inches me system shou,d b.e 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 />