occasionally received parking lot runoff during rain/snow melt, plus sand and other debris blown into the sump. Both tanks were removed from service due to severe pitting damage, TK117 in 1998, and TK109 in 2007. Tank 109 was visually inspected on a one-year frequency before being taken out of service in 2007. Tank 117 has not been inspected on a defined periodicity, given discovered leaking in 1998, the tank was inspected to determine the cause of failure on May 18, 1998. The dates of previous inspections are: Load-In Tank 109 Load-In Tank 117 November 5, 1998 May 18, 1998 October 5, 2000 September 25, 2002 June 10, 2003 May 26, 2004 September 15, 2005 December 7, 2006 December 7, 2007 (see Figure A8) Visual inspection data is mostly available for Tank 109, which was visually inspected eight times prior to failure. Accumulation of sediment on tank floor, heaviest near drain. Rust stains coming from inlet opening in roof, running down tank wall. Moderate to severe pitting in tank wall, with numerous rust streaked pits and pits capped with corrosion product. Pit density heaviest in eastern half of tank. Rust stains from carbon steel contamination in grinding marks on tank wall. Load-In Tank 109 Showing Pits on Tank Wall (A); Capped Pits in Tank Wall (B); Sediment on Tank Floor (C); and Rust Colored Stains at Tank Inlet (D) on December 7, 2007. Figure A8. Load-In Tank 109 59A-TK-109 Tank Number: 2025ED-59A-TK-109 Report Number: 021240814-019 Date: 12/7/2007 Pitting corrosion is still active in this tank as of December 7, 2007 and is likely worsening this tank. TK109 has been removed from service and is currently in delayed closure.
occasionally received parking lot runoff during rain/snow melt, plus sand and other debris blown into the sump. Both tanks were removed from service due to severe pitting damage, TK117 in 1998, and TK109 in 2007. Tank 109 was visually inspected on a one-year frequency before being taken out of service in 2007. Tank 117 has not been inspected on a defined periodicity, given discovered leaking in 1998, the tank was inspected to determine the cause of failure on May 18, 1998. The dates of previous inspections are: Load-In Tank 109 Load-In Tank 117 November 5, 1998 May 18, 1998 October 5, 2000 September 25, 2002 June 10, 2003 May 26, 2004 September 15, 2005 December 7, 2006 December 7, 2007 (see Figure A8) Visual inspection data is mostly available for Tank 109, which was visually inspected eight times prior to failure. Accumulation of sediment on tank floor, heaviest near drain. Rust stains coming from inlet opening in roof, running down tank wall. Moderate to severe pitting in tank wall, with numerous rust streaked pits and pits capped with corrosion product. Pit density heaviest in eastern half of tank. Rust stains from carbon steel contamination in grinding marks on tank wall. Load-In Tank 109 Showing Pits on Tank Wall (A); Capped Pits in Tank Wall (B); Sediment on Tank Floor (C); and Rust Colored Stains at Tank Inlet (D) on December 7, 2007. Figure A8. Load-In Tank 109 59A-TK-109 Tank Number: 2025ED-59A-TK-109 Report Number: 021240814-019 Date: 12/7/2007 Pitting corrosion is still active in this tank as of December 7, 2007 and is likely worsening this tank. TK109 has been removed from service and is currently in delayed closure.
314321_-_DRAFT_RPP-PLAN-61349_Draft.docx