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MAR -30-99 TUE 06:31 PM CWRO COMPANIES INC FAX NO. 5104J1 3698 P. 07/07 <br />�'itualions such as high coating conductivity at some location, due to coating damage or <br />deterioration, may result in low potentials and no protection on the structure. Eiectrical <br />interference from other direct current sources and electrical shielding of Ute protected structure <br />may contribute to corrosion of the structure if the problem is not identified and corrected. Items <br />such as these may not be discovered in a normal survey because of limited access to the <br />structure. Even when structure access is good and the potentials exceed the cathodic protection <br />criteria, corrosion may still occur if a disbonded coating is present. <br />Survey techniques exist to permit a thorough assessment of the cathodic protection status at all <br />Points on a structure. As these techniques are time consuming and costly, they are only <br />recommended when it is believed that a possible problem exists or additional assurance of <br />adequate. protection is required. <br />