ARCHIVED REPORTS_2010_11 - Laserfiche WebLink

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- K 1 meter to sound. This point is usually clearly visible on the probe. If it is not visible it should t .located by dipping the prone into a water container where the contact,can be clearly seen, then. . marked. The total-length of the water level meter should correspond with the length of the mea " g tape. In addition, the individual marks oa the cable should correspond with the correct footage. If the cable does not match the measuring t then the difference(if consistent) should be calculated. as a percentage, C.e.; 100 foot cable measures 102. feet 98�/®). All measurements with the cable should-then be multiplied by 0.98 to correct for the error. If the Individual footage marks are not placed corYeefly and are not consistent in their deviation, the instrament should be replaced. If the water level indicator is constructed of a cable then calibration will be peirforined once per year. If there is a disanpancy, the conversion factor will be marked directly on the instrument. Water level indicators constructed of to are more subject to stretching be' calibrated ,I ping and should be calibrated - every 6 month and marked with the appropriate conversion. Caliibrati®n data for each' entwill.bc.recorded-aaadkep a.binder•atth=offcefor-fmae_•: - reference. The most recent calibration results will also be recorded in the technicians field notes. There is no specific form for water level indicator calibration. nH Mctcr pH is_subject to significant variations due to temperature, buffering capacity of the water, and instrument drift.-For this reason pH metersmust be-caft1matedbefore and after sampling on each.. day and at least once more during the day. To calibrate a pH meter the iastruatent reading is - 4usted to read correctly for solutions with a standard pK Standard solutions arc mixed fresh, according to package i sanctiods„•for saarpling'event. 'Standard solutions or powd=for pH 4,7, and 10 are comm ' - y wmil-ble. Thcse standards •arc Pumbased and cd after shelf life has Shelf lives vary depending on the brand of standards used. If solution is used,the expiration date of the solution will be noted on the calibration log. Although different ds of pH meters Yrary, c dibration pro.cedurqs arc similar for all of them- A Seatiatized calibration p • follows: I. Turn on the iastrum=4 check the batwzy, and allow to warm up if accessary:. - 23493949•FO IMI OR32S A-2 htEy 14,200 24Q4 ' .lac.