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MAR -30-99 TUE 0629 PM 06RO COMPANIES INC FAX N0, 5104J1 3698 P. 02/07 <br />The final survey was conducted on March 5, 1999 (see Attachment 1, Cathodic Protection <br />Potential Data) to determine if the cathodic protection system meets the National Association of <br />Corrosion Engineers International (NAGE) criteria for cathodic protection (see Attachment 2, <br />N.ACE- RP0285-95 criteria). The recorded structure -to -soil potentials for the piping were found <br />to meet the accepted NACE criteria (100 mVolt Polarization) for cathodic protection and thereby <br />meet the EPA mquirements for extemal corrosion control. In addition it is expected that the tank <br />potentials will continue to polarize (become more negative) with time, as the cathodic protection <br />system continues to operate, No further work is required at this time. <br />It is recommended that the following issues be addressed <br />• E.F. Kludt to ensure the steel vent pipes are permanently electrically isolated from the <br />building, <br />• Authorize Corrpro to carry out the federally (EPA) mandated 6 -month retest of the cathodic <br />protection system. Carrpro can carry out this re -test (including issue of a letter report) at a <br />cost of $600.00 in September 1999. <br />• Authorize Corrpro to conduct a cathodic protection system re -survey on at least a three-year <br />basis, as required by the EPA. However, Corrpro recommends that the re -survey be carried <br />out on an annual basis, Cost for Corrpro to carry out this annual retest and to prepare a letter <br />report will be $600.00 for the year 2000 survey, <br />Thank you for this opportunity to serve you. If you have any questions or if we may be of <br />additional assistance, please do not hesitate to call us at (510) 614-8800. <br />Vury truly yours, <br />CORRPRQ COMPANIES, INC. <br />r'Y <br />Tim Oakley <br />[AT Coordinator <br />R71ts/C; A-lteporV575-0727/0727.xls <br />Crich: Data Sheet & Invoice, <br />