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2. Rinse the pH probe and temperAture probe with deionized water then place in We pH 7 .....� solution. 3. Adjust the meter for theappropriate tem ra thea read the pH_ 4_ If required use the "calibrate" 4ustinent on the meter to correct the instcwnerit to read PH y- . 5. Rinse the pH and temperature probes with deionlzed.water and place in the PH 10 solution {note: at Forward landO groundwAtcr pH is usually above ? therefore it is appropriate to use the Ph 10 standard. If the PH is below 7 then the pH 4 standard should be=4 6. Use the "slope"adjustment to cont the meter to properly read pH 10- 7. Rep-cat steps 2 to 6 until the meter reads p -7 and I0 as closely as possible. The calibration process will be recorded on a PH calibration log. Copies of calibration togs for each Individual.instrument are kept in a bindex.at the offico- The Ings are reviewed periodically T to ass= whether the it strunment-is.becoming= ore difficult to calibrate and there bre ncxds - .� adjustment b the w . 1 y mainufactttzer,®r if new probes are require& Conductivity Meter Conductivity Me:asilrement is subject to variations due to tem and h*,rumcW drift. For _this reason conductivity meters must be calibrated Wore and after sampling on each day and at - least once more during the day_ To calibrate a conductivity meter the instrument reading is adjusted to read correctly for solutions with a standard_ conductivity, Stwdard conduc&ity solutions are mixed fresh, g to package instructions, for each satnplistg event, Standard solutions for conductivity of 100, 1000, or 1-0,000 utnhos/litcr are commercially available. These standards are purthasod fivsh and discarded after shelf life has CXPked_ Shelf.lives wary depending on the brand of stmdards used„ If pre-prgmnd.solution is used,the expiration-date of the solution will be noted on the calibration log. 849401123 l pR?ZS A-3 July 14,2400 JAoo Kk�dda.toe.