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State Water Resources Control B and Page 3 of 6 9 who has no financial interest in the tank,must enter the tank and conduct several evaluations to ensure that the tank was properly lined.A special inspector(i.e.,a qualified professional engineer)may do this in lieu of the coatings expert. In addition to a visual check of the lining,the lining must pass thickness,hardness,and electrical resistance holiday detector tests(the latter is necessary for steel tanks only). If the tank passes those tests,then the access opening is closed,and a vacuum test and a tank integrity test must be performed.If the tank and lining pass all these tests,then the tank may be returned to service. IS CATHODIC PROTECTION REQUIRED? YES.If the exterior surface of the tank is unprotected from corrosion,the tank must be retrofitted with cathodic protection by December 22, 1998. However,if the lining applicator or special inspector notices corrosion during the lining process,then the tank must be retrofitted with cathodic protection before the UST is returned to service. Cathodic protection systems that are retrofitted on existing tanks must be designed by a corrosion specialist.A corrosion specialist must be certified by the National_Association_of_Corrosion.Engineers(NACE)or be a qualified professional engineer.Cathodic protection systems must be tested by a qualified person within six months of installation and at least every three years thereafter.The purpose of these inspections is to ensure that the tank and piping maintain proper corrosion protection in accordance with voluntary consensus standards(such as NACE-02-85 or API 1632). In addition,impressed current cathodic protection systems must be checked every 60 days to ensure that they remain in proper working order.Cathodic protection systems must be checked within six months of any construction in the vicinity of a cathodically-protected UST if the construction could have affected the cathodic protection system.This is to verify that no damage was done to the electrical system. If piping connected to the tank is single-walled,constructed of steel,and it is not replaced with new double-walled piping,then the cathodic protection system must also protect the piping from corrosion.Stainless steel,galvanized steel,coated steel piping,and wrapped steel piping are not considered corrosion-protected,and therefore,must be replaced or upgraded with cathodic protection by December 22, 1998.Other metal components of the UST system(such as submersible pumps)that routinely contain fuel and are in contact with the ground must also be cathodically-protected by December 22, 1998. WHAT FUTURE TESTS ARE REQUIRED OF THE INTERIOR LINING AND TANK SHELL? Within 10 years of the lining,and every five years thereafter,a coatings expert must conduct an evaluation of the tank and lining.A special inspector(i.e.,qualified professional engineer)may do this in lieu of the coatings expert. Depending on whether the tank is steel or fiberglass the evaluation must include:cleaning,visual inspection of the interior,interior diameter measurements,ultrasound thickness test of steel walls,thickness test of lining,hardness test of lining,electrical resistance holiday detector test,and a vacuum test.After the evaluation,the coatings expert or special inspector must certify one of the following: >>The tank is suitable for continued use for a minimum of five years. The tank is suitable for continued use for a minimum of five years only if it is relined or other necessary improvements are made. %>The tank is no longer suitable for continued use and must be closed immediately. IF A SINGLE-WALLED TANK WAS LINED PRIOR TO THE ADOPTION OF THE STATE'S LINING REQUIREMENTS WHEN DOES IT NEED TO BE INTERNALLY INSPECTED? If a tank was lined prior to August 1991,then it must be internally inspected by December 1998 in order to determine that the tank shell and lining meets the upgrade requirements. However,if a tank was lined prior to August 1991 and it can be shown that interior lining was conducted in accordance with the lining requirements that became effective in August 1991,then the internal inspection is not required until 10 years after the lining was applied. DO TANKS THAT HAVE BEEN LINED NEED TO BE MONITORED FOR LEAKS? YES.Tanks that have been lined and connected piping must be monitored for leaks in accordance with Article A.-C.C.R.The requirements for monitoring lined tanks and connected piping are the same as those for monitoring single-walled tanks and piping that have not been upgraded. [Enclosure 2] EXAMPLE PLAN CHECK FOR CATHODIC PROTECTION SYSTEM UPGRADES 1.System designed and certified as adequate by a corrosion specialist. 2.Cathodic protection for piping. 3.Cathodic protection for other metal components of UST system that routinely contain hazardous substances and are in contact with the ground. 4. If anodes are installed in wells,are the cathodic protection wells constructed in accordance with State Department of Water Resources standards? 5.If anodes are installed in wells,are the cathodic protection wells constructed in accordance with local requirements. 6.System tested by a cathodic protection tester within six months of installation in accordance with a voluntary consensus standard. 7.System tested every three years by a cathodic protection tester in accordance with a voluntary consensus standard. 8.System checked every 60 days by tank operator to ensure proper working order(impressed current systems only).Is there a written log of the visual observations maintained on-site? http://www.waterboards.ca.gov/water—issues/Programs/ust/leak vrevention/Igs/136—I.shtml 2/17/2010