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2. Rinse the turbidity probe with deionized water then place in the standard solution. <br /> 3. Adjust the meter for appropriate turbidity.scale then read the turbidity. • <br /> 4. If required use the "calibrate" adjustment on the meter to correct the instrument to read <br /> the comet turbidity. <br /> The Calibrationprocess will be'recorded on a turbidity calibration log. A Sample Cafibration <br /> L09 is located in Appendix C. Copies of calibration logs for each individual instrument an kept <br /> in a binder at the office. The logs are reviewed periodically top assess whether the instrument is <br /> becomin' <br /> g more difficult to calibrate and therefore needs adjustment by the <br /> manufacuu;cr, or if <br /> new probes are required. <br /> Equipment Decontamination <br /> To reduce the potential for introducing contaminants or cross-contaminating samples, sampling <br /> equipment that is used repeatedly at different wells lCm-line .filter, met=) will be washed. in a <br /> tdsodiurn•phosphate solution and triple rinsed with d6onized water prior to-usein each-welL-. <br /> The monitoring wells are equipped with dedicated-sampling-syst=s-wfilch-_-vvill not- " - <br /> require <br /> decontamination. Sterile factory scaled disposable bailers are used to collect the samples. Bailer <br /> cord is replaced between each well. <br /> Monitoring Order <br /> Groundwater monitoring will be conducted such that depth to water measurements and sampling <br /> is petformed in the least con ed wells fix-st0ased on historical results). Measurement and <br /> sampling ofder will d=move from lesser kVacted'wcfls to the most impacted wells. This is <br /> done to reduce the potential that wells and samples can betoss contaminated_ Groumfvater <br /> monitoring order begins at MW20 and then.MW-12 which are the background wells. The nima <br /> WcUs,'Iisted in order, to be sampled aim MW-15, -10, -1 ;and 3.. These wells rarely contain <br /> evidence Of chemical kapaCtS. The last weRs to be'sampled, fisted in order,incht& -14,,-13 <br /> and 2- Proposed well 16 will be sainpled in an appropriate order depending on what <br /> constituents are detected (if any) in the well, upon the first sampling. Initially, MW-16 will-be <br /> the last well sampled., <br /> 23493949-FOIA23 IOR325 A-5 My 14,2000 <br /> *"rI&2M XkWclda�Jw_ <br />