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• M <br /> a <br /> meter to sound This point is usually clearly visible on the probe. 'if it is not visible it should d <br /> located by dipping the probe into a water container where the contact,can be clearly seen, then- :, ?!� <br /> marked. The total-length of the water level meter should correspond with the length of cite <br /> measunng tape. In addition, the individual marks on the cable should correspond with the <br /> correct footage. If the cable does not match the measuring nape then the difference(if consistent) <br /> should be calculated. as a percentage, (i.e.; 100 foot cable measures 102. feet All <br /> meas mments with the•cable should-then be multiplied by 0,98 to confect for the, error. If the <br /> individual footage marks are not placed correctly and are not consistent in their deviad0n, the <br /> instrument should be replaced. <br /> If the water level indicator is constructed of a cable then calibration will be performed once per <br /> year. If there is a discrepancy, the conversion factor will be marked <br /> directly on the Inst tet, <br /> Water level indicators constructed of tape are more subject to stretching and should be calibrated <br /> every 6 month and marked with the appropriate conversion, <br /> Calibration data for each instrument will be.recorded.seed keptia a.binder at the:office farfutae_-_ <br /> r+efereace,. ?he most recent cali'bmtion results will also be recorded in the technicians field notes. <br /> There is no spec fic form for water level indicator calibration. <br /> OR lvleter <br /> pH is sub <br /> ject to significant variations due to temperatut°c, buffering capacity of the water, and <br /> instruwc=drift For this reason pH meters must be-cahibrated.before and after,sampling on each.. <br /> day ,and at least once more during the day. TO calibrate a pH meter the went reading is - <br /> a4usted to read correctly for solutions with a standard pl-L <br /> Standard solutions are mixed flesh, areording to Package iaastru+c:siQas for each <br /> sampling-event. <br /> Standard solutions or powders for pH 4,7, and 10 are oa3mme daffy xMilable. These standards <br /> arc Purcbased fresh and'discarded after shelf life has mTund- Shelf lives vary dgmading on the <br /> brand of standards used. If prc-prepared solution is used,the expiradon date of the solution will <br /> be noted on the calibration log. <br /> Although different brands of pH meters vary, calibration are similar for all of them. <br /> A geaeralized calibration procedure follows: <br /> 1. Turnon the instrument,check the battery,and allow to warts up if necessary.. _- <br /> 23-433904011231 OR323 A-2 My 14,2M <br /> 2D04 klelaf mar.lac. <br />