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• K <br /> 1 <br /> meter to sound. This point is usually cleadly visible on the probe. If it is bot visible it should k <br /> -located by dipping probe into a water container where the contact'can be clY seen, then t <br /> MaTked. The total length of the water level meter should correspond with the 'length of the <br /> measuring tape. In addition, the individual marks au the cable. should correspond with the <br /> correct footage. If the cable.does not match the measuring then the difference,(if consistent) <br /> should be calculated. as a percentage, (i.e.; IdU foot cible measures 142. feet 9$°I). AI} <br /> Mea=ements 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 /> instrument should be replaced. <br /> If the water level indicator is constructed of a cable then catiibration wiII be performed once per <br /> Year. If there is a discrepancy, the conversion factor will be marked directly on the instrumart. <br /> Water Ievel indicators constructed of tape are more subject to stretching and should becalibrated <br /> every 6 months and marked with the appropriate conversion. <br /> Calibration data for each" ent will.be-recorded-and kepeia a.binder.at the;office for-futurereference. Tbe most recent calibration results will also be recorded in the tecinicians <br /> field notes- <br /> Them <br /> is no specific forret for water level indicator calibration. <br /> pH Meter <br /> pH isstzhject to sigafficant variations due to tem capacity of the water, and <br /> eat drift For dfis reason pH meters must be-calilmatedbefore and after sampling on each.. <br /> day and at least once more during the day. To calibrate.a pH meter the insUment reading is = <br /> adjusted to read correcdy for solutions with a standard pH. <br /> Stan,dard solutions are mixed fresh, according to PackAge ' 'oris,-for each sampling event. <br /> Standard solutions or povMers for pH 4,7, and 14 are le. These standards <br /> P=hased and'discarded after shelf life Inas expired. Shelf lives vary depegding on the <br /> brand of smndards used. if pre-prepared solution is Used.the=piradon ddft of the solution win <br /> be noted on the calibration log. <br /> Of PH met= vary, calibration PrOceduM are Sfintffilr for all of them. <br /> A gencialized calibration pro follows: <br /> l. <br /> Turnon the kwurnent,check the ,and allow to wanii up if necessay., <br /> 93949.FotM'a A-z +o++�,,#,,,14,200 <br /> tw, <br />