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2. Rinse the PH probe and temperature probe with deionized water then place in the pH 7 i solution, 3. Adjust the meter for the appropriate tem tune 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 temperature probes with deion'ned.water and place in the pH 10 solution (note: at Forward landfill groundwater pH is usualfy above 7 therefore it is appropriate to use the Pb 10 standard. If the pH is below 7 then the pH 4 standard should be used) 6- Use the "slope"adjustment to convt the meter to properly read pH I0_ y- Repeat steps 2 to 6 until the meter reads p .7 and 10 as closely as possible. The calibration process will be recorded on a pH calibration log. Copies of calibration logs for each fzsdividu d.i ism nzent are kept in a binder-at d3e office- The lags are reviewed periodically to assess whether the instrument-isbecoming-more di.ffcah to calibrate and therefore•seeds - adjustment by the manufacbner,.or ifnew probes are requircd- Conductivity Mcter Conductivity measur=e st is subject to variations due to temperature and fiL4pj rnent drift. 17or - this reason conductivity meters must be calibrAed befbre and afber sampling on each day and at - least once more during the day_ To calibrate a conductivity meter the instrument reading is 44usted to read cowardly for solutions with a standaid conductivity. Standard conductivity solutions are mixed fish, accortfing to package instructions, for each sampling event. Standard solutions for conductivity of 144, I OW, -or 1.4,000 runhosA ter,arc ccratmercially available. These standards are]p=ha=d fresh and discarded after shelf life has Ocpired. Shelf,lives vary depending on the brand of standards used prc-prep=d solution is used,the expiration date of the solution will be noted on the c ali'bration log. 23-493949-FOI\'23 IOFIm A-3 Iuty I4,2400 Cap�ia 2i?00 Kldetfdda.tae. .