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Note: Some waste streams may contain additional constituents not covered by these <br /> methods. In those cases, additional EPA analytical methods must be <br /> employed to determine whether other constituents are present at concentrations <br /> which violate the primary drinking water standards or may otherwise adversely <br /> affect the health of persons. For literature regarding appropriate methods, see <br /> the reference section at the end of this document. <br /> E. Sample Labeling <br /> All samples should be tagged with an identification number; the date and time of <br /> sample collection; type of sample (water, sediment, soil etc.); signature of the sampler; <br /> whether the sample is preserved or unpreserved; the general types of analyses to be <br /> conducted; and, if the sample is known or thought to be hazardous, the tag should be so <br /> marked with information on the nature of the hazard (e.g. corrosive, flammable, <br /> poisonous). <br /> F. Sample Collection - Liauid <br /> 1. Volatile Organics <br /> Samples for volatile organics are generally taken first to minimithe disturbance <br /> of the fluid and resulting loss of volatiles. <br /> An oil/water interface probe should be utilized to define the base of any free <br /> floating product encountered while sampling. If no floating liquid phase is present, a <br /> sampling device can be lowered into the fluid -- as deeply as possible without disturbing <br /> the sediment -- and extracted with a representative grab sample of fluid. The fluid can <br /> then be transferred to pre-chilled, pre-labeled 40-ml volatile organic analysis (VOA) vials <br /> with Teflon septa. The sample should be preserved by adding hydrochloric acid (HCl) to <br /> �Q a pH of less than 2. Two 40-m1 vials should be obtained for each VOA sample. When <br /> /1 analyzing using the Toxicity Characteristic Leaching Procedure (TCLP), bear in mind <br /> that the volume of sample to be collected is dependent on the solids content of the <br /> sample. Sufficient sample volume is needed to allow for each physical phase to be <br /> analyzed separately. Sample bottles should be filled as completely as possible so that no <br /> head space remains. Do not add HCI to samples that will be prepared using the TCLP. <br /> If a separate floating phase is encountered while sampling, a sampling device that <br /> collects fluid from beneath the floating phase should be used. This device is operated by <br /> gently lowering it in the closed position to a depth below the oil/water interface, <br /> carefully opening and filling it with sampling fluid, and then closing and retrieving the <br /> sample. <br /> 23 <br />