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� t <br /> All instruments used to measure the above parameters will be rinsed with distilled water <br /> before and after each measurement. <br /> i <br /> i <br /> Purging may be performed by a vacuum truck,bailer, or pump. If a vacuum truck is <br /> used, only clean stingers will be.inserted in the monitoring well. Stingers which are <br /> reused will be triple rinsed as detailed in ERG's Standard Operating Procedures, <br /> i <br /> Decontamination Protocol. Bailers and pumps will be thoroughly decontaminated (as <br /> above),prior to and in between monitoring wells. Bailers will be lowered into the well <br /> with new lengths of polypropylene rope or Teflon coated wire which is capable of being <br /> decontaminated. <br /> Documentation. Well purging and sampling activities will be recorded on a well <br /> purging and sampling log which will include well purging start and finish times, amount <br /> of water purged,periodic measurements (after every 5 gallons removed) of temperature, <br /> water level,pH, and conductivity obtained during purging. Sampling information to be <br /> recorded on the log will include corresponding well number, collection time, date, and <br /> initials of the person collecting the sample as well as initial comments about the samples <br /> including a description of the color and odor, and any other unusual observations. A <br /> copy of the sampling log is attached. <br /> Instrument Calibration. Calibration of the instruments used for measuring the above <br /> parameters shall be performed each day, before use. Calibration shall be performed in_ <br /> accordance with manufacturer's specifications and will be recorded on calibration <br /> documents kept with the instrument. <br /> Sampling. Pre-cleaned sample bottles (cleaned according to EPA standards)will be <br /> obtained in advance from the contracted laboratory. The laboratory will be notified in <br /> advance of the specific analyses to be performed, and will provide pre-preserved bottles <br /> and vials appropriate for collection of the correct amount of water and proper <br /> preservation of samples as required for each analysis. All sample containers to be used <br /> for organic analyses will have Teflon linings inside of the covers. <br /> Groundwater samples will be collected immediately after purging, using a clean Teflon <br /> or disposable bailer. Reused Teflon bailers will be pre-cleaned according to ERG's <br /> Standard Operating Procedures, Decontamination Protocol. Disposable bailers will be 2 f� <br /> -.,� I <br />