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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 thea read the pH. 4< If required use the "calibrate" a•ctJustment on the meter to correct the instrument to read pH 7_ S• Rinse the pH and-temperature probes with deioai=d.water and place in the pH lo solution (note: at Forward landfill groundwater pH is usually above 7 therefore it is appropriate to use the Ph 10 smadard. ff the pH is below 7 then the pH 4 standard should be ase4 • 1 6. Use the "slope"adjustment to coarct the ratter to properly read pH 10- 7. Repeat steps 2 to 6 until the meter reads pf.7 and 10 as closely as possible_ The c�76rati4n process will be recorded on a pH calibration tog. Copies of calibration Logs for each iudividual.uistruutent are kept in a binder.at the office_ The logs are reviewed periodically to 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 Measur=cnt is subject to variations due to temperature and ' cut drift, For dins reason conductivity ureters must be catz'bWcd before and afrer sampling on each day and at least once more during the day. To calibrate a coniduetivity meter the zastrazaent reading is• a4usted to read con=tfy for solutionswith a standard conductivity. Standard conductivity solutions are mixed fresh, according to package instructions, for each sampling event. Standard solutions for conductivity of 104, 1400,'or 1.0,004 tmzhos/liter,are y avanabia. These standards are purchased firsh and di=ardad shelf life has Shelf lives vary c1cpending on the brand of standards used, If pre d solation is theexpiration' date of the solution wW be noted on the c'ali'bration log. 23 &t9-fi0I123 E0R32i M3 Ady 140 200 .lac.