CCP 01-23-2006 - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I LABORATORY INVESTIGATION Samples of the existing coatings were procured for laboratory analysis. A total of three samples were analyzed, and the samples were identified as follows: Sample Identification Location Remarks KTA-l Exterior Pedestal Base Total Coating System KTA-2 Interior Dry Pedestal Total Coating System KTA-3 Interior Wet Total Coating System The laboratory investigation consisted of infrared spectroscopy and atomic absorption spectroscopy. The results of the analyses are provided below. Infrared Spectroscopy Infrared spectroscopic analysis was performed with a Mattson Galaxy Model 3020 fourier transform infrared spectrometer equipped with a Harrick Split Pea accessory. The Harrick Split Pea accessory allows attenuated total reflectance (A TR) spectra to be obtained from the surfaces of small samples. Briefly, the infrared spectroscopic analysis revealed: 1. The spectrum obtained from the light blue topcoat of Sample KTA-l (Spectrum No.1) was consistent with a urethane based on characteristic spectral bands near 1730,1690,1460,1250, and 1120 cm-1. The presence of aliphatic hydrocarbons was evidenced by the spectral bands in the 3000 to 2900 cm-1 region. The presence of silicates was evidenced by spectral band near 1080 cm-1. The presence of titanium dioxide was evidenced by the broad spectral band in the 700 to 500 cm'] region. Atomic Absorption Spectroscopy Samples KTA-l, KTA-2 and KTA-3 were analyzed for total lead, cadmium, and chromium in accordance with AOAC Method 974.02. Briefly, this method entails digesting samples in acid, filtering and analyzing by flame atomic absorption spectroscopy. Briefly, the lead and cadmium content of the samples was non-detectable. The coatings applied to the interior wet portions of the tank had detectable levels of chromium. Elevated Water Storage Tank City of Arden Hills South Tank 17