Four violations categorized as two Severity Level III problems related to the identification of excessive silt accumulation in the essential service water (ESW) cooling tower basins and the river screen house intake channel. The first problem involved the failure to (1) translate design configuration information into volumetric requirements for the ESW cooling tower makeup calculation and (2) develop an appropriate acceptance criteria for surveillance procedures to assure ESW operability. The second problem involved two failures to take appropriate corrective actions for conditions adverse to quality involving the silt accumulation and degraded ESW trash racks.