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GROUNDWATER TECHNOLOGY, INC_ <br /> STANDARD OPERATING PROCEDURE NO. 9 <br /> l WATER SAMPLING METHODOLOGY <br /> Before water sampling, each well shall be purged by pumping a minimum of four well volumes <br /> or until the discharge water indicates stabilization of temperature conductivity and pH If the <br /> well is evacuated before four well volumes are removed or stabilization is achieved, the sample <br /> should be taken when the water level in the well recovers to 80 percent of its initial level <br /> Retrieval of the water sample, sample handling and sample preservation shall be conducted <br /> 1 according to Standard Operating Procedure 10 concerning "Sampling for Volatiles in Water.` <br /> The sampling equipment used shall consist of a Teflone and/or stainless steel samplers which <br /> meet U.S. Environmental Protection Agency (EPA) regulations. Glass vials with Teflone lids <br /> should be used to store the collected samples <br /> 1 To ensure sample integrity, each vial shall be filled with the sampled water in such a way that <br /> the water stands above the lip of the vial The cap should then be quickly placed on the vial <br /> and tightened securely The vial should then be checked to ensure that air bubbles are not <br /> present prior to labeling of the sample. Label information should include a sample identification <br /> number, lob identification, date, time, type of analysis requested, and sampler's name. Chain- <br /> of-custody records shall be completed according to Standard Operating Procedure (SOP) 11 <br /> concerning chain of custody <br /> The vials should be immediately placed in high quality coolers for shipment to the laboratory. <br /> The coolers should be packed with sufficient ice or freezer packs to ensure that the samples are <br /> kept below 4" Celsius (C) To minimize sample degradation the prescribed analysis shall take <br /> place within seven days of sample collection unless specially prepared acidified vials are used <br /> To minimize the potential for cross contamination between wells, all the well development and <br /> water sampling equipment which contacts the groundwater shall be cleaned between each <br /> 1 sampling As a second precautionary measure, the wells shall be sampled in order of increasing <br /> contaminant concentrations (the least contaminated well first, the most contaminated well last) <br /> as established by previous analysis <br /> 1 <br /> 1 <br /> CONCORD SOP MGM <br /> LJLJ GROUNDWATER <br /> iM TECHNOLOGY, INC <br />