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-a. <br />'U"WES0 <br />-- engineering constructors, inc. <br />License # 703190 <br />4780 Cheyenne Way, Chino, CA 91710 p) 888-588-8737 f) 909-594-6169 www.sunwestengineering.com <br />August 28, 2014 <br />Verizon California, Inc. <br />Re: Cathodic Protection System Survey for the 6,000 -gallon Underground Storage Tank located at Manteca Central <br />Office, 430 West Center Street, Manteca, CA 95336 <br />Dear Sir or Madam: <br />The galvanic cathodic protection (CP) system at the above location includes four magnesium anodes connected <br />through a test station to the underground fuel tank, piping, tank hold down straps, and anchoring system. The CP <br />system was installed in June 1999. <br />The survey was conducted by measuring the structure -to -soil potentials at the locations described on the attached <br />data sheet. Potentials were measured with and without protective current applied using a digital multi -meter <br />connected between the test points, and a saturated copper/copper sulfate reference electrode (CSE) in contact with <br />the earth. Current flows were also measured between the anodes and the underground storage tank (UST), vent and <br />UST anchors. The potentials recorded met or exceed the minimum of --850 millivolts (mV) as specified by the National <br />Association of Corrosion Engineers (NACE). <br />This survey was conducted in accordance with the procedures and test methods described in NACE Standard <br />Recommended Practice RP0285-2002, Corrosion Control of Underground Storage Tank Systems by Cathodic <br />Protection, NACE Standard Practice SP0169-2007, Control of External Corrosion on Underground or Submerged <br />Metollic Piping Systems, and NACE Standard TM0101-2001, Measurement Techniques Related to Criteria for Cathodic <br />Protection on Underground or Submerged Metallic Tank Systems. <br />SunWest Engineering Constructors, Inc. appreciates the opportunity to assist you in this phase of your corrosion <br />mitigation program. If you have any questions, please contact Todd Hansen at (909) 247-6538 at your convenience. <br />Thank you, <br />Todd M. Hansen <br />NACE Certification No. 26518 <br />APR 2 , _ [' <br />