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1 <br />' Analysis of this rinse blank will be used to validai~e cleaning <br />I <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-trJatment and <br />holding times, as outlined in Table 5, will be strictly $dhered to. <br />' 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 />(2) The samples to be measured should be coll@cted 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 oK 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 />(5) Instrument probes should be cleaned with de-iodized water <br />' between each sampling station to preveht cross- <br />contamination. <br /> <br />-22- <br /> <br />