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2. -Rinse the turbidity probe with Monized 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.procass will be recorded on a turbidity calibration log. A Sample Calibration Log is located in Appendix C. Copies of calibration logs for each individual fiLstrument arc kept in a binder at the office. The logs are reviewed periodically top assess whether the instrument is becoming more difficult to calibrate and therefore needs adjustment by the manu£actuxer, or if new probes are required. .Equipment Decontamination To reduce the potential for introducing contaminants or-cross-contaminating samples,sampling equipment that is used repeatedly at different wells (i 4ine filter, meters) will be washed in a trisodium•pltosplYate solution and triple rinsed with dcioni=d water }mor to-use•in each-we1L. Tine monitoringwells are with dedicated-sampling Pled ' s which---will not require decontamination. Sterile factory scaled disposable bailers are used to collect the samples_ Bailer cord is replaced between each well- Monitoring Order . s Groundwater monitoring will be conducted such that depth to waxer moments and sampling is performed in the least contaminated wells frst(based on historical results). Measurement and sampling order will then move from lesser impacted wells to the most impacted wells. This is done to reduce the potential tint wells and samples can be cross contaminated. Gmundwat r twr&oring order begins at MW-20 and then 1"42 which are the back wells. The next wells, listed in order, to liesampled .arc MW-15, -10, -1 and -3.. These wells rarely contain evidence of chemical irupacts. The last wells to be'sampled, listed in order, include MW-14,.-13 and '-2. - Proposed well 16 will be sainpled in an ippropniate order depending on what constituents are detected Cif any) in the well upon the first sampling. Initially, MW-16 will-be the last.well sampled. It49384940IN23 IOR325 A-5 July 14,2000 cartstu 2M xktader,tom.