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2. Rinse the pH probe and aemperatureprobe with deionized 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 instrument to read pH 7. 5- Rime the pH and temperature pmbes with deionized water and place in the pH 10 solution (note: at Forward Landfill 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 used) 6. Use the "slope"adjustment to correct the meter to properly read pH 10_ 7. .Repeat steps 2 to 6 until the meter reads pH.7 and 10 as closely as possible. The calibration process will be accorded on a pH calibration log. Copies of calibration logs for eath } individual ent ire kept in a binder at the office. The logs are reviewed periodically t® assess whether the instrument-is.becoming-more difficult to calibrate and therefore.-needs adjustment by the manufacturer,.or if new probes are required. Conductivity Meter Conductivity Xneasurement is subject to variations due to ttmPerab= and instrtImeat drift. For reasonthis conductivity meters must be calibrated before.and afrer sampling on each day and at least Once more during the day_ To calibrate a conductivity meter the fintrum4ent reading is 4usted to read correctly for solutions with a standard conductivity. Standard conductivity solutions are mixed fresh, according to package instructions, for each SMWUng event, Standard solutions for caaaduEctivlty of 100, 1000, or 1.0,000 a nhoslliterr arc y available. These are pure fresh and discarded after shelf life has Shelf lives vary dcpwdiing on the brand of standards used: If preVrepared solution is the expiration'date of the solution will be noted on the calibration log_ 7 23 &49-FO I LZ31 QR32i A-3 July 14,2000 CMTf 04"M e t8C