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~, <br />Following a sampling series of no more than 5 samples, a rinse <br />' blank will be collected from the bucket, running laboratory- <br />provided de-ionized, distilled water throughout the entire bucket. <br />i Analysis of this rinse blank will be used to validate cleaning <br />' procedures. <br />' Immediately after collection, all samples must be placed in iced <br />coolers. The sample bottles required for each surface water sample <br />' are listed in Table 5. Sample preservation, pre-treatment and <br />holding times, as outlined in Table 5, will be strictly adhered to. <br />1 3.2.5 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 documented in <br />Table 6. <br />1 (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 />(3) All measurements should be made within as brief a period <br />of time as possible, so that temperature or chemical <br />changes will be minimized. <br />' (4) In some cases, the instruments take a certain amount of <br />time to stabilize. This stabilization time should be <br />noted for each measurement. <br />1 <br />' -23- <br />1 <br />