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2. Rinse the turbidity prole 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" 4ustment on the meter to correct the instrvmcat to read the correct turbidity. The calibration.prods will be recorded on a turbidity calibration log. A Sample Calibration Log is located in Appendix C, Copies of calibration logs for each individual instrument are kept in a binder at the office. The logs arc reviewed periodically top assess whether the instrument is bc:comiring more difficult to calibrate and therefore needs adjustment by the manufactuier, or if new probes are required. Equipment Decontamination To reduce the potential for introducing contaminants or cross-roman inating espies,Sampling equipment that is used repeatedly at different wells (m4ine filter, meters) wiH be Wudshed in a trisodium,phosphate solution and triple rinsed with lonized water prier to we.in each-welL. The monitoring wells are equipped with dedicated sampling systems-vddch-.—WM .not-regtiirc decontamination. Sterile factory sealed disposable bailers amused to collect the-samples. Baffler cord is replaced between each well- lMonitoring Order - Groundwater monitoring will be conducted such _that depth to water measurements and sampling is paformed in the least contaminated wells first on historical results). Measurement and sampling order will thmm move from lesser '_ to the most kipacted wells. This is done to reduce the potential that wells and samples can be cross contaminated. Groundwater monitoring order begins at 20 and then MW-12 are the background weds. The next wells, in order, to be sampled arc -15, -10, -1 and 3.. These wells rarely contain evidence of chernical'impacts. The last wcM to be'sampled, in order,include -1 4,,-13 and. -2. - Proposed well 16 will be sainpled in rqpriatc order depending on what consfticrits art: detected(if any) in the well upon the first samplin& initially, MW-16 will-bc the lastwell sampled. 23-4839444811231oR325 A-5 }uty 14,2040 200Xteinfdder,tar.