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2. Ririe the turbidity probe with deionized water then place in the standard solution, 3. Adjust the meter for appropriate turbidity.scale then read the turbidity. 4. If required use the "calibrate" adjustment on the meter to correct the instrument to read the correct turbidity. - The caRbration proc= win be rded on a turbidity cafflmdon tag. A Sample C,.dibration Log is located in Appendix C Copies of calibration logs for eacb individual instrument are kept in a binder at the office. The logs are reviewed periodically tap assess whether the instrument is becoming more difficult to calibrate and therefore needs adjustcacat by the manufactures, or if new probes are required. Equipment Decontamination To re&cc the potential for introducing contaminants orcross-contaminating samples,=Mpjing equipment that is used repeatedly at differentWCUS M- 4inc filter, meters) will be vsrashed in a phosphate solution and triple rinsed vdth dcionized }mor to-use-in each-wtiL 0The7) m 'o ' wells are with dedi will not p . which-. wire- decontamination. Sterile factory sealed disposable bailers are to collect the saarplcs. l3acr cord is replaced between each well- Monitodrig Order - Groundwater monitormg will beconducted such.tIzat depth to vatcr Measurements and samplingis performed in the least contarritinated on histo6calremits), Measummmi and sampling cider will then.move from 1 to the most hripactedis done toreduce the potential wells and samplescontamfimttd. Commdwate monitoringorder begins at 20 and then hM-12urldc Imia lls, in 9rder, to be sampled aim -15, -10, -1 and 3.. These wells mrely contain 'dence of chemical ImPWts. The last wells to be'sampled, in orde4 ins MW-14,.-13 d '-0- well 16 wM be sainpled in an appropriate order depending on witat _ constituents are detected(if any) in the well upon the first sampUng. Utially, -16 Will-be e well sampled. , j 23-493949401W IOR325 A-5 My 14 ,2000 C*PYdCM 2000 daa,IW_