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R <br />meter to sound. This point is usually clearly visible on the probe. If it is not visible it should c <br />1® located by dipping the probt into a water container where the contact can be cl <br />early seen, then 1 <br />marked. The total -length of the water level meter should correspond with the length of the <br />measuring tape. In addition, the individual marks oa the cable should correspond with the <br />correct footage. If the cable does not match the measuring tape then the difference (if consistent) <br />should be calculated as a percentage, (i.e, 100 foot cable measures 102 feet All <br />measurements with the- cable should -then be multiplied by 0.98 to correct for the error. If the <br />individual footage marks are not placed correctly and are not consistent in their deviation, the <br />iniument should be replaced. <br />If the water level indicator is constructed of a cable then c�libration will be performed once per <br />year: If there is a discrepancy, the conversion factor will be marked directly on theinstrument. <br />Water level indicators constructed of tape are more subject to stretching and should be calibrated <br />every 5 months and marked with the appropriate conversion.. <br />Calibration data for each instrument will.be_recor ded -and kept;in a binder- at the. office forfuture_ : - . <br />reference. The most recent calibration results will also be recorded in the technicians field notes. <br />There is no specific form for water level indicator cribration. <br />OH Meter <br />•is subject to significant due totempenaturc,buffering capacity of , water, at <br />filStr=ent a For ais reason pH xnetmmustr calibr:azed before t r after sampling• r each <br />day and. <br />at leastonce more during day. To calibrate pH meter the t t ra wtreading <br />4usted to read CCr=dyfor • real ri . standard a <br />Standard solutions aremixed fiesh, according tO Pack4ekUtrUCdOns,-1br each sampling <br />'Standard Solutions or i♦ •w for pH 4, 7. and 10 am commextiaHy.... +.td.it <br />am Purchased s ,». r and- discarded . `e • has seri ra Shelf lives vary depending • r the <br />brand t: a . t • t :usa pre -prepared solutionis used. thecgiration dAto of the • a • r WM <br />be noted •:r the mMration •.. <br />Although diffmtnt brands of pH meters vary, cabibration proms are siuti for all of them. <br />A generalized cah on proceduic follows: <br />1. Turn on the instrument, check the battexy, and allow to warm up if necessary., `t <br />23493949-Fo 1t23 J OR325 A•2 July 14,200 <br />2000 XkWgi4a, lac- <br />