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2. Rinse the turbidity probe with Moaized water then place in the standard solution, 3. Adjust the meter for appropriate turbidity_scale then read the turbidity. 4. If rquimd use the "calibrate" adjustment'on the meter to correct the instn nzent to read the correct turbidity. ' e The Calibration process will be recorded on a turbidity capon log. A Sample Calibration Log is located in Appendix C. Copies of calibration logs for each individual instrument arc kept in x 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 manufacturer, or if new probes are required. Y Equipment Decontamination i To reduce the potential for introducing contain;=ts or cross-contaminating sampi ns,.sampling equipment that is used repeatedly at different wells (m-line filte4 meters) wfiH be vrashcd in a #rzsadium phosphate solution and triple rinsed with ddoniwd water prior to.use.is each-wen The monitoring wells are equipped with decdicatcd samprng-systems-which.vriill not-regtiirc � dccontmiination. Sterile factory sealed disposable bailers arc used to collect the samples. Babes cord is replaced Between each w,-JL Monitoring Order ' Groundwater monitoring will be conducted such that depth to watrx measurements and sampling is performed in the least contaminated wells first(based on b Tical results). Measurement and sampling order will dm move from lesser', 'wells to the most impacted wells. This is done to reduce the potential that wells and sample can be c toss contmninated. G oundwate McWtoring order begins at MW-20 and then MW-12-%Cch are the b wkg nd Wea., The next wells,' sted in order, to be sampled a-= MW-15, -10, -1 and 3.. These wells rarely contain evidence of chemical impacts. The last wells to be'sampled,listed in order,include MW-14,43 and --2. ' Proposed well 16 will be sampled in an approp mite order depending on what _ constituents arc detected(if any) in the well upon the first sampling. InithWy, MW-16 will-bc the last,well sampled. 4939-44-F4112310RM A-s fitly t4,2440 �naa xs�aaa,�.