Laserfiche WebLink
GROUJMWATER TECH110LOGY <br /> STANDARD OPERATING PRCCEDUP.7 <br /> CONCERNING WATER SA1,1PLING b?ETHODCLOGY <br /> SOP 9 <br /> Prior to water sampling, each well shall be purged by <br /> pumping a minimum of four well volumes or until the <br /> discharge water indicat;es stabilization of temperature, <br /> conductivity,and oil. If the well is evacuated before <br /> four well volumes are removed or stabilization is <br /> achieved, the sample should be taken when the water <br /> level in the well recovers to 80W of its initial level. <br /> Retrieval of the water sample, sample handling and sample <br /> preservation shall be conducted in accordance with <br /> Groundwater Technology Laboratory Standard Operating <br /> Procedure (GTL SOP 10) concerning Sampling For Volatiles <br /> in Water". The sampling equipment used shall consist of <br /> a teflon and/or stainless steel samplers, which meets <br /> EPA regulations. Glass vials with teflon lids should be <br /> " used to store the collected samples. <br /> •"o insure sample integrity, each vial shall he frilled with <br /> the sampled water such that the water stands above the lip <br /> of the vial. The cap should then be quickly placed on the <br /> vial and tightened securely. The vial should then be <br /> checked to ensure that it bubbles are not pLesent prior <br /> to labeling of the sample. Label information should <br /> include a sample identification number, job identification, <br /> date, time, type of analysis requested and the sampler's <br /> name. Chain-of-Custody forms shall be completed as per <br /> Groundwater Technology Laboratory Standard Operating <br /> Procedure (SOP 11) concerning Chain of Custody. <br /> The vials should be irm-mediately placed in high quality <br /> coolers for shipment to the laboratory. The coolers <br /> should be packed with sufficient ice or freezer packs to <br /> ensure that the samples are kept below AC. Samples which <br /> are received at the Groundwater Technology Laboratory <br /> above 10 C. will be considered substandard. To minimize <br /> sample degradation the prescribed analysis shall take <br /> place within seven days of sample collection unless <br /> specially prepared acidified vials are used. <br /> To minimize the potential for cross contamination between <br /> wells, all the well development and water sampling equip- <br /> ment which contacts the groundwater shall be cleaned <br /> between each well 'sampling. As a second precautionary <br /> measure, the wells shall be sampled in order of increasing <br /> contaminant concentrations as established by previous <br /> analysis. <br /> GROUNDWATER <br /> FDE TECHNOLOGY,INC. <br /> CONSULTING GROUNDwA rER GEOLOG1s- <br />