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F 2• Rinse the pH probe and temperature probe with deionized water then place in the pH 3. Adjust the meter for the appropriate temperature thea read the pFL 4. If required use the "calibrate" adjustment on the meter to correct the lastcurnent to read PH 7- . 5. Rinse the pH and tempmture probes with deionbrd.water and place in the pH 10 soluti®n note: at Forward groundwater pH is usually above T therefore it is VXOPriate to use the Ph 10 If the pH is below 7 them the pH 4 standard should be used) 6- Use the "slope"4ustnment to co,rrea the meter to Properly read pH 10. �- Repeat steps 2 to 6 until the meter reads pH_7 and 10 as closely as possible_ - The'CaUzadon process will be recorded on a pH c 4bration log. Copies ofc tt'bration logs for =_. each Indi-Vi4m l.insb=ent are kept in a bindenat the ofikii The logs are reviewed periodically —Y to assr..ss whether the ' ent•is.becoming-more diffi'euh to cabbrateand therefore seeds - adjustmeut by the manufacturer,or if new probes are required- CO activi equired_COildactiyi x titer i Conductivity rucasitr=,ent is stificct to variations due to temperature and in,tr=eat dri& For tlxis reason conductivity meters must be caliibWnd before and affkr ,�qP13ng on each day and at least once more during the day_ To calz'bxau a co tiductivity meter the hmtn=Gnti reading is- V#ustcd to con=dy for solutions with a standard conductivity. Standard conductivity soMons are mixed fT=k according t0 package instructions, for each sampling event. Standard solutions for concl�ity of 100, 1000, or 10,000 umhos/litcr arc 4mMMCrcially available- These standards are purchased fresh and cpscarded after shelf Life has expired, Shelf lives vary depending on the brand of st wduds used; Ifprc_PrgMrA solution is used,the expiration date of the solution will be noted on the calibration log. 849-FOIM IOR3Z A-3 o July I4,2000