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Summary: are appropriate for leak survey is to re-survey a known small leak on the system. If it can be detected at normal walking or driving speeds, the survey can continue. FIGURE IV-7 This figure shows leaking gas following the sewer line into the home, after leaking at the service tee. Natural gas can migrate in this manner. FIGURE IV-8
Image Dimensions: 500 x 395
Image originally found here.
