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t 2. Rinse the PH probe and temperature probe 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 kstt unent to read = PH 7_ - $- Rinse the pH and tempe=ure probes with deloni=d.water and place in the PH 10 solution (note: at Forward IandfRl groundwater pH u usualfy 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 used) G- Use the "slope"adjustment to con-ecL the meter to properly read pH 10- 7. d,7. Repeat steps 2 to 6 until the meter reads pH-7 and I0 as closely as Possible_ - 'The cali'br-WOO.Process will be recorded on a pH calibration Ion Copies of calibration logs for Oath Individual.itlstrummt are kept in a binder.at the office. The legs are reviewed Periodically —. to assess whether the instrument is.becoming-more difficult to call-brate and 7liezefoxe needs - r adjustment by the manufactxu-cx;ar if new probes are required. Conch2cii vitt'Meter a Conductivity measmement is subject to variations due to temperature,and inV=ment drift. For #his reason conductivity meters must be calibre before and afL r-sampr g oa each day and at least once more during the day. To calibrate a conductivity meter the instrument reading is to read correctly for solutions with a standard conductivity. Standard conductivity solutions arae mixed fz=k according to a insrzucti _ alis, for each sampling event. Standard solutions for °vitt' of 100, 1000,-or I-0,000 umhcisnitift-azc erczalIy available. These standards are purchased fresh and Tncardcd after shelf life has CPQ- Shelf lives vary depending on the brand of standards us&L If -pr epared solution is used,the expiration' date of the solution will be noted on the calibration log. 234M949-FOIk23 IORM A-3 zw»da. My 14,2000