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2. Rinse the turbidity probe with deionized water then place in the standard solution, i 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 instmment to read the correct turbidity. The calibration.process will be recorded on a turbidity cahbration lag. A Sample Calibration Log is located in Appendix C Copies of calibration logs for each individual instrument arc kept in a binder at the office. The logs arc reviewed periodically tap assess whether the instrument is becoming more difficult to calibrate and therefore needs adlustMent by the manufactuier, or if new probes are reggved. .Equipment Decontamination To reduce the potential for introducing contaminants or cross-contaminating samples,.sampling e=quipment that is used repeatedly at different wells (in-line filter, meters) will be washed in a trisodium•phosphate solution and triple rinsed with deionized water prior to-use.in each-weiL. The monitoringwells arc with dedicated-sam lin systems-which-.wM not-PPGd sampling� rcqui7c decontainination° Sterile factory scaled disposable bailers are used to collect the samples. 13ai[er cord is replaced between each well. Monitoring Order . Groundwater monitoring will be conducted such that depth to water meastxrements and sampling is performed in the least contaminated wells first(based on historical results), Measurement and Zing order will then move from lessor impacted wells to the most impacted vmXs. This is done to reduce the potential that wells and samples am be cross con Gro to monitoring order begins at MW-20 and thea -12 TAich aze the background weld The Head wells,'listed in order, to be sampled are -15, -10, -I and -3.. Thee wells rarely contain evidence of chemical impacts. The last wells to be'sampled, listed in order,include •14,.-13 and '.2 " Proposed well 16 will be sampled in an ag . tiate order depending on What - constituents arc detected (tf any) in the well upon the first sampling. initially, MW-16 wM-be the last,well sampled. 1 23-483944-F41M1OMS A-S Jury 14, CVyd&2000 Y.1c c14cr,1t w.