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2. Rinse the pH probe and temperature probe with dcionized water then place in the PH 7 solution, P 3. Adjust the meter for the appropriate temperature then read the pH. 4. If required use the "calibrate" adjustment on the meter to correct the instrument to read pH 7. 5. Rinse the pH and temperatureprobes with deionized .water and place in the pH '10 solution (note: at Forward landfW groundwater pH is usually above 7 therefore it is appropriate to use the Ph 10 standard If the PH is below 7 then the pH 4 standard should be ased) �. Use the "slope"adjustment to correct the meter to properly read pH 10- 7. t},7. Repeat steps 2 to 6 until the rueter reads PHI and I0 as closely as possible. The calibration process will be recorded on a pH calbratiart Iog. Copies ®f calibration logs for each i4ndividual.ifistr=ent are kept in a binder.at cc The logs arc reviewed periodically to assess whether the went•is.beco -mo cult to calibrate and therefore•needs Oil adjustmeut by the manufwtxm ,or if new probes are required- J Conductiyj Meter Conductivity measuremcrnt is subJect to r-niationsdue to tenqxrure and wentdrift. For tfiis reason conductivity meters must be cah'brated before and aft=sampling on each day and alt - least once more during the day_ To calibrate a coi6ducd . meter the instrument reading is Z&Jwtcd to read correct#y for solutions with a siandirdconductiviw. Standard conductivity solutions are mixed fresh, according to Package instructions, for each sauTling event. Standard solutions for conductivity of 100, 1000, -or 1.0,000 uaahos/literr,arc y available These standards are pumhasod fi=h and discarded after shelf life has cxphv,CL Shelf lives vary dcpmding on the brand o used;, if pre-prepared.solution is the expiration date of the solution will be no on the calibration log. 23-4313849-fiO11231QRW A-3 My 14,2400 e�