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li <br />n <br />11 <br />SOP <br />1/8/1988 <br />Page <br />of 13 <br />2.2 Sample collection <br />Prior to the actual collection of the sample, careful _consideration <br />must be given to the type of analytical testing that will be required. it <br />is essential that all the pre -collection and post -collection precautions <br />are taken to prevent contamination and to preserve the sample for <br />subsequent analysis. <br />Routine water sampling procedures are based on the general sampling <br />procedures recommended in various sections of the current edition of <br />Standard Methods, and in the ASTM Annual Standards, Part 31, Water, and in <br />the EPA -600/4-82-029, "Handbook for Sampling and Sample Preservation of <br />Water and Wastewater". Any additional sampling requirements specified in <br />the individual test methods must also be incorporated into the sampling <br />procedure to ensure that meaningful and respresentative samples are used. <br />The types of samples collected are described below: <br />2.2.1 Grab Sample <br />The grab sample represents the composition of a body of water at a <br />particular location at a given point in time. it is important that it is <br />understood by the parties involved precisely what the grab sample is <br />intended to represent. It is essential that the sample is representative <br />of the body of water being sampled and selection of the sampling location <br />is critical. If necessary, multiple samples can be taken and combined to <br />make a single representative sample. <br />The manner in which the sample is taken is dependent on the body of <br />water being sampled and the type of testing involved. The sample container <br />(except' those containing additives) is rinsed three times with the water <br />49 <br />