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collecting a vapor sample from a sewer manhole is no more difficult than collecting soil gas sample PFC concentrations are often higher at the bottom of the manhole than at the top so we recommend collecting the sample from a depth of one foot above the bottom of the manhole or the top of the liquid whichever shallower the first step is to measure the depth of the manhole and to check for the presence of standing liquids this can be done using a water level meter or weighted tape measure if the manhole cover does not have vent holes slide to cover off to create a small opening in order to minimize the mixing of ambient air the manhole cover should not be completely removed until after sample collection has been completed to collect the sample lower a weighted sample line to the target depth for a manhole with minimal liquids the bottom of the manhole can be identified using the weight to fill the bottom four manhole with standing liquids the target depth can be marked on the sample lin