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Enclosure D <br /> Field Methods and Procedures Page 4 <br /> Proper collection and handling are essential to ensure the quality of a sample. Each sample will be <br /> collected in the appropriate container, preserved correctly for the intended analysis and stored prior to <br /> analysis for no longer than the maximum allowable holding time. <br /> D.2 Groundwater Field Measurements <br /> Field data will be collected during various sampling and monitoring activities; this section describes <br /> routine procedures to be followed by personnel performing field measurements. The methods <br /> presented below are intended to ensure that Feld measurements are consistent and reproducible <br /> when performed by various personnel. <br /> D.2.1 Conductivity,Temperature, and pH <br /> Specific conductance,water temperature,and pH measurements will be made when a water sample <br /> is collected. Regardless of the sample collection method, a representative water sample will be <br /> placed in a transfer bottle used solely for field parameter determinations. A conventional pH meter <br /> with a combination electrode or equivalent will be used for field-specific conductance measurements. <br /> Temperature measurements will be performed using standard thermometers or equivalent <br /> temperature meters. Combination instruments capable of measuring two or all three of the <br /> • parameters may also be used. <br /> All instruments will be calibrated in accordance with manufacturer's recommendations. The values for <br /> conductivity standards and pH buffers used in calibration will be recorded in a field notebook. All <br /> probes will be thoroughly cleaned and rinsed with fresh water prior to any measurements, in <br /> accordance with Section E. <br /> E. DECONTAMINATION AND DISPOSAL PROCEDURES <br /> All equipment that comes into contact with potentially contaminated soil,drilling fluid,air or water will <br /> be decontaminated before each use. Decontamination will consist of steam cleaning, a high- <br /> pressure, hot water rinse,or trisodium phosphate(TSP)wash and freshwater rinse,as appropriate. <br /> Drilling and sampling equipment will be decontaminated as follows: <br /> 1. Drill rig augers, drill rods, and drill bits will be steam-cleaned prior to use and <br /> between borings. Visible soil, grease, and other impurities will be removed. <br /> 2. Soil sampling equipment will be steam-cleaned prior to use and between each <br /> boring. Prior to individual sample collection, any sampling device will also be <br /> • cleaned in a TSP solution and rinsed twice in clean water. Any visible soil <br /> residue will be removed. <br /> 3. It is anticipated that disposable equipment will be used to collect water samples. <br /> If disposable equipment is not used, water sampling equipment will be <br /> decontaminated using methods described in item 2 above for soil sampling <br /> equipment. <br /> • 4. Water sampling containers will be cleaned and prepared by the respective <br /> analytical laboratories. <br /> 5. Stainless steel or brass soil sampling tubes will be steam-cleaned or washed in <br /> TSP solution and rinsed with clean water. <br /> • 6. Field monitoring equipment(pH, conductivity, or temperature probes)will be <br /> rinsed with clean water prior to use and between samples. <br />