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Plumbing bing Leak and Water-Damaged Materials in Guidance Area <br /> J <br /> As reported by Mr. Tripp, a plumbing leak was discovered on Monday, November 29, <br /> 2010, the day prior to the 1 iIDPH assessment. The source of the leak was an HVAC unit(Picture <br /> 1 located in a mechanical room adjacent to the guidance area(specifically morn B-1 15). As <br /> result of the leak, which likely occurred over the previous weekend, GW and carpeting in the <br /> guidance area was moistened. At the time of the assessment, industrial fans were in use to dry <br /> carpet and G W (Picture '17). <br /> To determine if GLV and carpeting had elevated moisture content that would be <br /> c on duc iv e-to mold growth, MDPH I A Q staff conducted mo isture testing ofthe se materials. <br /> Elevated moisture measurements were detected in rooms B-1 1.5 and B-1 1 (Table l , 1ndicat ing <br /> that materials were Bret at the time of the assessment. In addition, visible mold growth was <br /> observed behind a file cabinet and vinyl base coving along the floor in B-115 Iicture 18). <br /> The US Environmental Protection Agency US EPA and the American Conference of <br /> Governmental Industrial Hygienists IH recommend that porous materials e.g., CSW) be <br /> dried with fans and heating within 24 to 48 hours of becoming vet US BPA, 2001; ACGIH, <br /> 1989). If not dried within this time frame, mold growth may occur. Once mold has colonized <br /> porous materials, they are difficult to clean and should be removed. <br /> At the time of assessment, MDPH IAQ staff recommended: <br /> Removal of all carpeting in B-11 ; <br /> • Re ov al of moistened carpeting in B-113 approximately I -feet from the shared wall <br /> between the mechanical morn and guidance suite; and <br /> • Removal of mold-colonized GW in B-115. <br /> 9 <br />