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1 <br /> <br /> <br /> <br />IJ <br /> <br /> <br />1 <br />i <br /> <br /> <br /> <br /> <br /> <br />i~ <br /> <br /> <br />If the degree of contamination of the wells is known, tlhey will be <br />sampled in an ascending degree of contamination, with the least <br />contaminated well being sampled first. <br />After use, each bailer, pump and bucket used in the sampling <br />procedure will be cleaned using the procedures as outlined in this <br />protocol. The cleaning procedure will be quality-controlled as <br />outlined under the "Field Qiratiry Control" section (Section 2.3) . <br />Following a bailing/pumping series of no more than 5 samples, a <br />rinse blank will be collected from the cleaned apparatus by running <br />laboratory-provided de-ionized, distilled water thropghout the <br />entire bailerjpump apparatus. Analysis of this rinse blink will be <br />used to validate cleaning procedures. <br />Immediately after collection, all samples must be placed in iced <br />coolers. <br />Sample preservation, pre-treatment and holding times, as outlined <br />in Table 5, will be strictly adhered to. <br />2.2.9 Field Parameter Measurements: Standard procedures should be <br />followed to maintain consistent measurements of field parameters. <br />These standard procedures are as follows: <br />(1) Instruments should be calibrated at the beginning of each <br />sampling day, using a known standard solution. Field <br />instrumentation calibration procedures are docy~mented in <br />Table 6. <br />(2) The samples to be measured should be collected in a <br />sample container that has been cleaned at least twice <br />with the same water that is being measured. <br />-16- <br />