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AOL <br />1P <br />SEP 16 2010 <br />Re: Cathodic Protection System Survey for the 6,000 — Gallon Underground Storage <br />Tank located at Manteca CO, 430 W. Center St., Manteca, CA •5336. <br />down straps, and anchoringsystem. <br />The survey was conducted by measuring the structure to soil potentials at all locations <br />described on the attached data sheet. Each potential was measured with and without <br />protective current applied using a digital multi -meter connected between the test points <br />and a saturated copper/copper sulfate CuCuSO4 reference electrode in contact with the <br />earth. The potentials recorded exceed the minimum of —850 millivolts (mV) as specified <br />by the National Association of Corrosion Engineers (NACE). <br />r -n NACE Standard Recommended Practice RP -0285-02, Corrosion Control of <br />Underground Storage Tank Systems by Cathodic Protection and American Petroleum <br />Institute Recommended Practice 1632 entitled Cathodic Protection of Underground <br />Petroleum Storage Tanks and Piping 4stems. <br />SunWest Engineering Constructors, Inc. appreciates the opportunity to assist you in this <br />phase of your corrosion mitigation program. If you have any questions, please contact <br />Byran G. Shipley at (909) 594-9850 Ext. 14 at your convenience. <br />I hereby certify that I am responsible for the review and certification of the services <br />described in this document and for the preparation of this document. The services <br />described in this document have been provided in a manner consistent w&" t <br />standards of the profession and to the best of my knowledge com I <br />federal, statT,4nd local statutes, regulations and ordinances. <br />o <br />Nt, <br />NACE <br />JjaSd4, P.E. JAY M. SHIPLEY ;0 <br />% 193 <br />so <br />0 <br />