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GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCER14ING WATER SAMPLING METHODOLOGY <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 indicates stabilization of temperature, <br /> conductivity,and pII. 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 808 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 /> To insure sample integrity, each vial shall be filled 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 air bubbles are not present prior <br /> to labeling of the sample. Label information should <br /> include a sample identification number, job i.dentifi-cation, <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 immediately 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 4C. 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 r;ross 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 shy be sampled in order of increasing <br /> contaminant concentrations as established by previous <br /> analysis. <br /> GROUNDWATER <br /> TECHNOLOGY,INC. <br /> CONSULTING GROUNDWATER GEOLOGISTS <br /> ATTACHMENT 3 <br />