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2• Rinse the PH probe and sempemture probe with deionized water then place in theH solution. p 7 3. Adjust the meter for the appropriate temp6mt=theca read the pH. 4. If required use the "calibrate" adjustment n the meter to correct the instmment to read pH 7_ S. Rinse the pH and temppro eioniud .water and place in the pH ! solution (note: at Forward Landffil groundwater pH is usually above 7 therefore it is, appropriate to use the Ph 10 standard. If the pH is below 7 thea the pH 4 standard should be ass4 6. Use the "slope"adjustment to correct the meter to property Sead pH 10. 7. Repeat steps 2 to 6 until the meter reads pH.7 and 10 as closely as possible. The calibration process wwill be recorded on a pH caribration log, Copies of cait'bration logs for eWch Individu&l.ifistrnment are kept in a b' at ce. ?he Iags are r+avcwcd periodically —B to assess whether the iaLstr=ent-is.becoming-morecult to calibrate and therefore seeds - adjustment by the manufacturer,or if new pmbes are required- Conductivity required- ConductivityMeter r i Condu ctivity incesbrcment is subject to variations due to and ' eat drift For this reason conductmty meters mast be calibrated before sampling on each day and at - 1CaSt Once more d=ing the day_ To calibrate a co6ductivity meter the hnUument reading is to read correctly for sohxti=with a standard a condwtivity. Stmdard conductivity solutions are mixed fivsh, according to pwjmge instructions, for each aid solutions for Mty of 100, 1000, or 10,000 sPuber,are tOwnuxCiAlly avaflable. These star -are p and &scarded after shelf life has CcphvdL Shelf Iives vary dependmig oa the brandof standards used: Ifsolution is . Pnya� - the expiration date of the solution wM be no on the caUbtadon log. 349-fO112310R325 A-3 July 14,2000 4