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2. Rinse the pH probe and tempemture probe with d6onized water then place in the pH 7 solution, 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 instTurner, to read PH 7- - 5. Rinse the pH and temperatureprobes with de€o ' .water and place in the pH to solution {note: at Forward landfill groundwater pH is usually above 7 therefore it is appropriate to use the Ph 14 standard If the pH is below 7 them the pH 4 standard Should be used} & Use the "slope"adjustment to coarct the meter to properly read pH 10. 7. Repeat steps 2 to 6 until the meter reads pl.7 and I0 as closely as possible. The calibration process will be recorded on a pH calibration tog. Copies of calf-br,atio.n logs for each Individual.instrument are kept in a binder.at the office. The logs are reviewed periodically to assess whether the instrument•is.becoming-more difficult to c abi brate and thcrefore.-needs - �� adjustment'by the manufactm= or if new probes are re uired. Conducxivi Meter Conductivity-mcasurement is subject to variations due to temp=urc and 'instrument: drift. For _ this reason conductivity meters must be calibrated before and ager sampling on each day and at least orace more during the day_ To calibrate a conductivity ureter the instrument reading is 4ustred to read correctlyforsolutions with a standard conductivity. Standard c9nductiAty solutions are mixed fresh, according to package instructions, for each sampling event. Standard solutions for 'vitt' of 104, 1 ,'or 1.0,000 umhdsMtm-ar6 y available These standards'are purcchwed fresh and discarded dtershelf life has exp' 1f&es vary dcpcading on the brand of standards used:, If pre solution is the expiration*date of the solution will he noted on the cahibradon log. 23 849-FO11231OR323 A'3 Jury 14,200 C4PrW2MKkWkkkr,Tw-