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Section No. 2.2.4 <br />Revision No. 0 <br />Date May 1, 1977 <br />Page 14 of 17 <br />• 4.4.2 Routine Checks - The following listed checks should <br />be made when removing an exposed filter: <br />1. Check the filter for signs of air leakage. Leakage <br />may result from a worn faceplate gasket, Figure 4.8, or an <br />improperly installed gasket. If a leakage is observed, void <br />the sample, determine the cause and take corrective action <br />before starting another sampling period. Generally a gasket <br />deteriorates slowly, and the operator can decide well in <br />advance (by increasing fuzziness of the sample outline) to <br />change the gasket before a total failure results. <br />2. Visually inspect the gasket face to see if glass <br />fibers from the filter are being left behind, resulting from <br />over-tightening of the faceplate wing-nuts and cutting the <br />filter along the gasket interface. <br />3. The operator should check the exposed filter for <br />• physical damage that may have occurred during sampling or . <br />after sampling. Physical damage to the filter after sampling <br />does not always invalidate the sample as long as all pieces <br />of the fliter are included in the folder. However, any loss <br />of sample due to leakages during the sampling period or to <br />loss of loose particulates from the filter after sampling (e.g., <br />loss of particulates when folding the filter) invalidates the <br />sample. The operator should mark all such samples void and <br />forward them to the laboratory. <br />4. The appearance of the particulates should be checked. <br />Any changes from the normal color, for example, may indicate <br />new emission sources or construction activity in the area. <br />The chance should be noted on the filter folder along with <br />any obvious reasons for the change. <br />4.5 Documentation <br />The following listed information must be recorded on the <br />• filter folder or on a field data sheet by the persons indicated. <br />1. By the operator who starts the sample: <br />a. Station location. <br />b. Project. <br />'=a. <br />c. Site number. <br />d. Sampler ID number. <br />