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2. Rinse the pH probe and temperaturc 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" adjustment on the meta to correct the instrument to read PH 7. 5- Rinse the pH and temperature probes with deionized .water and place in the PH I0 solution (note: at Forward Iandfrll groundwater pH is usually above 7 therefere it is appropriate to use the Ph 10 standard. If the pH is below 7 them the pH 4 standard should be aced) 6. Use the "slope" adjustment to con -ca the meter to properly read pH 10- 7. Repeat steps 2 to 6 until the meter reads p1 .7 and 10 as closely as possible_ 'The cah-bration process will be recorded on a PH calibration lor, Copies of 4=h-bradon logs r each 11: t :1 f RI•«. 1.'. f binder -at office-.. The •gs am i periodically min to assess Whether the 'as�r=ent - is- beco ' 'Mom df ffcah to calibrate •.'therefore. -needs adjustment by the manufacbn-er,.or ifnew probes am required- Condt=livia Mete_ ConductivitifL measur=cm is subjectto variationsdue to temperature .Is. ! r • r ! r•a. «r dr •. this reasonconductivitymeters:mustbe calibrged before and af « sampling on each day and .: least once more during r e day- • calibrate conductivitymeterrr r a•r ant� reading a4lustcd to read correctly for solutions with a standard conductivity. Y.l• • r• tr f Ilr •; ft ♦ ../ 1. .wtaccording to packageInstructions, each Sampling • Standard solutions or conductivity t. • ' 100, 1000,or 0,000 1. ata r • ".+ *M[Mercially available. 'These standards are purchased ... • :[• • discarded :ate' -r shelf Iffe,has WfivcL Shelf lives vary depending on the brand of standards usa If pre-prepared.6 is a «• -the expiration' date of the solution will bo noted on the calibration a. 23-4139 49-FOIA23 IOFW A-3 July I4, 2000 CaMF& 2m KWalSrW r lac