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- 3 - <br /> field parameters are +/- 0 6 degrees Fahrenheit (F) for temperature, +/- 0 2 for pH, <br /> and +/- 10 percent of the total value of EC <br /> Once the field parameters have been observed to stabilize, and a minimum of <br /> four (4) casing volumes have been purged from a well, groundwater samples will <br /> be collected using a Teflon bailer All samples will be collected in such a manner <br /> as to minimize the volatilization or oxidation of a sample due to agitation during <br /> transfer from the bailer to the sample container A well-purging/sampling log will <br /> be maintained for purging of each monitoring well. <br /> Calibration of field equipment will be performed at the beginning of each day, <br /> according to manufacturer's specifications and consistent with methods <br /> described in EPA SW-846, Test Methods for Evaluation Solid Waste <br /> Physical/Chemical Methods <br /> Sam le Collection <br /> Samples of non-stagnant formation water will be collected only after a minimum <br /> of four (4) casing volumes of water have been purged from the well casing and <br /> the field parameters have been observed to stabilize. In low-yield formation wells <br /> which were purged to dryness, the sample(s) will be collected as soon as the well <br /> has recovered sufficiently for sample collection. <br /> All samples will be collected in an order such that those parameters most <br /> sensitive to volatilization will be sampled first A general order of collection for <br /> some common groundwater parameters follows <br /> - Volatile Organic Compounds (VOCs) <br /> - Total Organic Halogens (TOX) <br /> - Total Organic Carbon (TOC) <br /> - Total Metals <br /> - Dissolved Metals <br /> - Phenols <br /> - Sulfate and Chloride <br /> - Turbidity <br /> - Nitrate and Ammonia <br /> The type of sample container used for sample collection will depend upon the <br /> sample analysis to be performed and will be in accordance with EPA <br /> requirements for sample-analysis container type <br /> Equipment Decontamination <br /> All equipment which will be placed in any well will be cleaned with a <br /> biodegradable or non-phosphate detergent solution, and thoroughly rinsed with <br /> steam-distilled water prior to each use <br /> June, 1991 <br />