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meter to Soun(L 7bis point is usually clearly visible on the probe, if it is notvisible it Shahid � <br /> located by dipping into a water container contw can be cl � <br /> Y seen, then <br /> marked. The total length of the water level meter should ccs nd with the lend of the <br /> measuring tape. la addition, &c individual marks oncable- uld correspond with the <br /> correct f a ie t hmeasuringt) <br /> should be calculated, as a perceruge, (1*.e4 100 Voot cable ineasures 102 :feet 9SV <br /> measuremenm'with the, le 0.98 to Corrict for the emr. If the <br /> individual footage maim am not placed correctly and am not consistent in their deviador, the <br /> instrument shoum be <br /> If the water.level indicator is conswxted of a cable then cfiibration will be, erfurmcd since per <br /> year. If there is a discrcpancT, the cenversion lactor be marked direc y on the i�istrumcrsz. <br /> Water level indiiators constructed of tapt am more subjectto-Metching and should be calibrated <br /> every S d marked with the appropriate conversion. <br /> Calibration data Ibr each instrument will o ` -a binder at theto ce for- c...= <br /> ce. IIx most recent cahibradon results will also be recordedtechnicians:field notm <br /> Them is no specific form fbr water level indicazor cahibtadotL <br /> pH is zubjoct to significant vwiafions due to tcmperap tity of the <br /> annd <br /> For dris reason PH re and aft=sampling on <br /> day d at leut once wore during the day: To cabibraft a pH mew the insUvm<Mt reading is <br /> to dy br nswith a standard_pP— <br /> Standard solutions are mixed firesh,according tO PackAge °lmsuuctxoasa for cvcr€t. <br /> Standard "os or powders for pH 4, 7, and 10 are commercially available. Ihese <br /> am purchased discarded mer shelf life an the <br /> brand of standards used- If pre-prVared l 'on is used.the c9iration dm of the solution will <br /> be noted on the calibrationlog. <br /> Although » bx=ds of ion procedures are similarfor an of them <br /> A genaalized cabibration P fbllo <br /> " <br /> 1» Tum on the instrumw to warm up ifn ate.. <br /> 94 -FOi !#CM2 14,2000 <br />