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6-11AITTE Lcorporation <br /> Field Protocol 3 .lune 1991 <br /> During purging operations, the field parameters of pH, temperature, and <br /> electrical conductivity (EC) in the purged water will be monitored and recorded at a <br /> minimum rate of two (2) readings per casing volume purged. Stabilization of the <br /> L- parameters of pH, temperature and EC will be used to indicate that the well has been <br /> sufficiently purged for sampling. Parameter stabilization will be indicated by at least <br /> three near-constant pH, temperature, and EC values for a minimum of one (1 ) casing <br /> �- volume. The acceptable range of values for stabilization of the field parameters are <br /> +/- 0.6 degrees Fahrenheit (F) for temperature, �-/- 0.2 for pH, and +/- 10 percent <br /> of the total value of EC. <br /> Once the field parameters have been observed to stabilize, and a <br /> minimum of four (4) casing volumes have been purged from a well, groundwater <br /> samples will be collected using a Teflon bailer. All samples will be collected in such <br /> a manner as to minimize the volatilization or oxidation of a sample due to agitation <br /> during transfer from the bailer to the sample container. A well-purging/sampling log <br /> will be maintained for purging of each monitoring well. <br /> Calibration of field equipment will be performed at the beginning of each <br /> day, according to manufacturer's specifications and consistent with methods <br /> described in EPA SW-846,Test Methods for Evaluation Solid Waste Physical/Chemical <br /> Methods. <br /> SAMPLE COLLECTION <br /> Samples of non-stagnant formation water will be collected only after a <br /> minimum of four (4) casing volumes of water have been purged from the well casing <br /> and 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 has <br /> 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 some <br /> }� 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 /> T <br />