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2• Rinse the pH probe and tempt fi= probe- with deionized water then place in the PH 7 <br /> solution <br /> 3. Adjust the meter for the appropriate tem tune then read the pH. <br /> 4. If required use the "calibrate" adjustment on the miter to correct the instnmefit to <br /> read <br /> PH 7_ <br /> 5. Rime the pH and temPazt= probes with deknized water and place in the pH 10 <br /> solution {note: at Forward bndffll groundwater pH is usually above 7 therefore it is <br /> appropriate to use the Ph 10 If the pH is below 7 then the pH 4 standard should <br /> be rind) <br /> 6. Use the "slope"adjustment to con-ta the meter to properly read pH 10- <br /> 7. <br /> t}_7. .Repeat steps 2 to 6 until the meter reads pH-7 and 10 as closely as posse-ble. <br /> The calc'braoion process will be recorded on a pH calibration log, Copies of calibration logs for <br /> cWth Individual.kstrum=t are kept is a binderat&t office The logs are reviewed periodically <br /> to whether the ' ent is becoming-mora diffcalt to cab-brltc and -therefore needs - <br /> adjustment by the manufacturcr,or if new probes are required. <br /> Cooductivity Meier <br /> Co "vity measurement is sols ect to variations due to fait=and " <br /> . J eat dri#�. 1:'or <br /> _d2is reason conductiWty meters must be ed before and after sampling on ra,clt day and at - <br /> lc= once more dming the day_ To calz'luate a coriductivity mcta the bstrument <br /> reading is <br /> 214usted to read con=dy for solutions with a standard con ' 'y. <br /> Stuxlard conduc&ky solutions are mboed fresh, accomfing to pacimse fiLitructions, for each - ' <br /> sampling event„ Standad wbxdow for conducthity of 100, 1000, or 1. arc <br /> 4ownMvIally.a le° These arc purchased A=h and discarded OR=shelf life bas <br /> WhV& Shelf lives vary dept on the brand of standards usa If pn cd,solation is <br /> the iration' date of the solution will be noted on the calibradon log, <br /> .y <br /> 23 849-FOR l O A-3 July 14,2000 <br /> Joe. <br />