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r ' <br /> ME77 <br />�e <br /> GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING WATER SAMPLING METHODOLOGY <br /> SOP 9 <br /> Prior to water sampling, each well shall be purged by <br /> pumping a minimum of four well volumesor until the <br /> discharge water indicates stabilization of temperature, <br /> conductivity,and pH. If the well is evacuated before <br /> four well volumes are remr�ved or stabilization is <br /> achieved, the sample 'should be taken when the water <br /> level in the well recovers to 80% 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 <br /> integrity, vij3l shall <br /> ith <br /> the sampled water such that the hwater stands babove lthe ed wlip <br /> of the vial. The cap should then be quickly placed on the <br /> vial and tightened securely. . The vial should then be <br /> 5 checked to ensure that air bubbles are not present prior <br /> to labeling of the sample. Label information should <br /> include a sample,-;dniitification number, .hob identification, <br /> date time,. type of analysis requested and the samplers <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 /> r coolers for shipment to the laboratory. The coolers <br /> should bs packed with sufficient ice or freezer packs .to <br /> ensure that the samples are kept below 4C. Samples which <br /> 5 are received at the Groundwater Technology Laboratory <br /> above 10 C. will be considered substandard. To minimize- <br /> sample degradation the prescribed analysis shell take <br /> place within seven days of sample collection unless <br /> specially prepared acidified vials are used. <br /> x . <br /> To minimize the potential for. cross contamination between , <br /> wells, all the well development and water sampling equip- <br /> ment which contacts the <br /> groundwater :hall be cleaned s <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 /> K analysis„ <br />