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2. Rinse the turbidity probe with tieionixed water then place in the standard solution. <br /> 0 <br /> 3. Adjust the meter for appropriate turbidity.scale then read the turbidity. <br /> 4. If required use the "cah'brate" 4ustment on the meter to correct the snstrurnent to read <br /> the correct turbidity. <br /> The calibration.process wifl be recorded on a turbidity calibration 1o9. A Sample Calibration <br /> Log is located in Appendix C. Copies of calibration logs for each individual instrument are kept <br /> in a binder at the office. The togs are reviewed periodically top assess whether the instrument is <br /> becoming-more difficult to calibrate and therefore n adlustutent by the manufacturer, or if <br /> new probes are required. <br /> .Equipment Decontamination <br /> To reduce the potential for introducing contaminants or cross-contazninating samples,.sampling <br /> equipment that is used repeatedly at diff'e=t w (in-fine fitter, meters) will be =gashed in a <br /> trisodium-phosphate solution and triple xinsed with dcionized water prior to••ase'in each-4vc1L <br /> The monitoring wells are equipped with dedicated piing-systems which-:win riot-rept=- � <br /> decontamination. Sterile factory sealed disposable bailers arc used to collect the samples. Bailer <br /> cord is replaced between each welL <br /> Monitoring Order <br /> t <br /> Groundwater monitoring will be conducted such.that deA to waiter measuxv=cats and sampling <br /> is performed in the least contaminated wells fust0ased on historical results). Measurement and <br /> samPfing order will then move from lesser`. to the most b4=ted well& This is <br /> done to reduce the potential that wells and samples can bo cross confaminate& Qvundwatcr <br /> monitoring order begins at MW-20 and thea -12 vWch are the background wells. The next <br /> wells,'listed in order, to be sampled are -15, -1 , -1 and 3.. These wells rarely contain <br /> evidence of chemical*impacts. The last wells to be=pIed,Wftd in order,include »14,,-13 <br /> and '-2. - Proposed well i 6 will be sampled in an ApPrOSI-atc order depending on what _ <br /> constituents are detected(if any) in the well upon the first sampling. Initially, MW-16 will-be <br /> the lastwell sampled. . <br /> 23493949-FOR23IOR325 A-S kitty 14,2000 <br /> 2U0O ICtCsfl(C��,1AC. <br />