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2. Rinse the pH probe and tern tore probe with deionized water then place in the pH 7 .. solution, 3. Adjust the meter for the appropriate tempemture then read the pH. 4. If required use the "calibrate" Adjustment on the meter to correct the instrument to read pH 7. �. Rime the PH and temperature proPes with deionized water and place in the p 1O solution (note: at Forward water pH is usualfy above 7 therefore it is appropriate to use the Ph 10 staridard. 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- Me c�'hration proc=will be recorded on a pH calibration log. Copies of calibration logs for ea:ch Individual.ifistrum=t are kept in a binder at the officx. The logs arc reviewed periodically Aoki to assess whether the instrunzent-is.becoming-mom difffcult to c alz'brate and -thczefore needs adjustment by the manufactu=,,or ifnew probes are required- ConductivLty Meter Conductivity in ent is sutlect to variations due to temperattre and instrument drifL For reasonthis conductivity meters must be calx before and after sampling on each day and at least once more during the day. To calibrate a colidulcdAtY meter the fimtruxnent r=ding Ls. to read correctly for solutions with a siandard conductiAty. Standard conducCrifty so ons are n3bced fi=k according to package i ctifor each sampling event S=dard solutions for conductivity of 100, 1000. or 1.0,000 umh6sMer,are WMInercially available. Ihese are purchased fi=h and discarded shelf fife has ccPked. Shelf lives vary depending on the brand of If pared solution is theexpiration' date of the solution will be noted on the calibration log. 23 849-FOIA23 I O A-3 July I4,2400 .Lx.