Detection of Immiscible Layers Sample Clauses

Detection of Immiscible Layers. Previous sampling indicates that this section is not applicable for most facilities If immiscible layers of contaminants (free product “floaters” or “sinkers”) are suspected or seen or if odors or an oil sheen are observed, follow special procedures to characterize the distribution of contaminants in the water-yielding zone adjacent to the well screen. Because free product can accumulate anywhere from the top to the bottom of the water column, precede the 7 c-clf1- normal sequence of purging and sampling with a free-product evaluation step to allow for the best characterization of nearby contamination. Based on site and well-specific information, make a decision regarding the number and depth of discrete, depth-specific, samples needed. If free product is suspected but the source not clearly defined, collect separate samples from at least the top and the bottom of the water column before purging. Collect the discrete interval samples in a manner that disturbs the water column as little as possible; begin sampling with the interval closest to the top of the water column and proceed downward. More specifically, use a xxxxxx to collect any pre-purging samples from the water table surface and use a thief sampler to collect any pre-purging discrete-interval samples from below the top of the water column. Keep the thief sampler closed while being lowered through the water column, open it at the bottom of the well and then completely close it again while raising it back up through the water column. In addition to any discrete-interval samples collected, collect an additional sample from near the middle of the water column after normal purging. Analytical needs for these three samples will be reviewed with the appropriate regulatory agency representative to determine which analyses are required for each sample. Visual screening or sequential analysis of samples may eliminate the need to analyze all samples collected in some circumstances. Note the presence and characteristics of any detected immiscible layers on the Sampling Form. Attempt to measure the thickness of any free product using an interface probe. General procedures for detection and sample collection of immiscible layers will be in accordance with guidance provided in the Technical Enforcement Guidance Document (TEGD EPA 1986, pages 100-102). Record and include specific detailed procedures actually used in response to site/well conditions on the Sampling Form and in the Sampling and Analysis Report.
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Related to Detection of Immiscible Layers

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