Laserfiche WebLink
<br />Sample collection <br /> <br />A decontaminated, bottom-fill Teflon bailer will be used for <br />each well sample collection. To minimize the potential loss of <br />volatile organics, the following parameter collection sequence <br />will be followed: <br /> <br />1) <br />2) <br />3) <br />4) <br /> <br />Volatile organic compounds <br />Total organic carbon <br />General chemistry <br />Trace metals <br /> <br />All sample containers will be completely filled to the top to <br />minimize headspace. <br /> <br />Clean sample containers will be supplied by the laboratory. <br />Containers will be labeled at the respective well location using <br />a permanent marker. <br /> <br />Sample aliquots for major cations will be filtered through a <br />0.45 micron filter and acidified with reagent grade nitric acid <br />in the field to a pH less than 2. <br /> <br />Temperature, electrical conductance and pH will be obtained from <br />each well immediately after the last sample is collected. <br />Instruments used for field measurements will be calibrated at <br />each location prior to use. Sampling personnel will also note <br />the color, visual observation of turbidity or sediment and <br />additional comments concerning the sample. <br /> <br />Field quality assurance samples <br /> <br />The following field quality assurance (QA) sampling scheme will <br />be conducted for each sampling event. The QA samples will be <br />analyzed (in addition to all original samples) and will be used <br />to check sampling methodology. <br /> <br />Field QA samples will include a trip blank and sampling <br />equipment rinsate blank. Trip blanks consist of a water sample <br />provided by the laboratory, carried to the field by samplers <br />along with the actual sample bottles, transported to the <br />laboratory, and analyzed exactly like all other samples. Any <br />contaminants found in the trip blanks could be attributed to <br />interaction between the sample and the container, contaminated <br />sample bottle or a handling procedure that alt~rs the integrity <br />of the sample matrix. <br /> <br />A sampling equipment rinsate will be collected in the following <br />manner. After decontamination has been performed on the <br />sampling equipment, and prior to use, a distilled water rinsate <br />will be collected from the appropriate sample collection system <br /> <br />7 <br />