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CCP 01-23-2006
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CCP 01-23-2006
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5/8/2007 1:21:14 PM
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11/14/2006 4:41:45 PM
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />LABORATORY INVESTIGATION <br /> <br />Samples of the existing coatings were procured for laboratory analysis. A total of <br />three samples were analyzed, and the samples were identified as follows: <br /> <br />Sample Identification Location Remarks <br />KTA-l Exterior Pedestal Base Total Coating System <br />KTA-2 Interior Dry Pedestal Total Coating System <br />KTA-3 Interior Wet Total Coating System <br /> <br />The laboratory investigation consisted of infrared spectroscopy and atomic <br />absorption spectroscopy. The results of the analyses are provided below. <br /> <br />Infrared Spectroscopy <br /> <br />Infrared spectroscopic analysis was performed with a Mattson Galaxy Model <br />3020 fourier transform infrared spectrometer equipped with a Harrick Split Pea <br />accessory. The Harrick Split Pea accessory allows attenuated total reflectance (A TR) <br />spectra to be obtained from the surfaces of small samples. <br /> <br />Briefly, the infrared spectroscopic analysis revealed: <br /> <br />1. The spectrum obtained from the light blue topcoat of Sample KTA-l (Spectrum <br />No.1) was consistent with a urethane based on characteristic spectral bands near <br />1730,1690,1460,1250, and 1120 cm-1. The presence of aliphatic hydrocarbons <br />was evidenced by the spectral bands in the 3000 to 2900 cm-1 region. The <br />presence of silicates was evidenced by spectral band near 1080 cm-1. The <br />presence of titanium dioxide was evidenced by the broad spectral band in the 700 <br />to 500 cm'] region. <br /> <br />Atomic Absorption Spectroscopy <br /> <br />Samples KTA-l, KTA-2 and KTA-3 were analyzed for total lead, cadmium, and <br />chromium in accordance with AOAC Method 974.02. Briefly, this method entails <br />digesting samples in acid, filtering and analyzing by flame atomic absorption <br />spectroscopy. Briefly, the lead and cadmium content of the samples was non-detectable. <br />The coatings applied to the interior wet portions of the tank had detectable levels of <br />chromium. <br /> <br />Elevated Water Storage Tank <br />City of Arden Hills South Tank <br /> <br />17 <br />
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