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GROUNDWATER TECHNOLOGY !NC STANDARD OPERATING PROCEDURE NO 9 ',VATER SAMPLING {METHODOLOGY �Cfore , ater samolinq cacn � ui shall be curgeo Uy pumoinq a minimum or Tour well volumes or until the discharge water moicates staoillzation or temperature conauctivity and pH If the ,tell 1s evacuated berore tour well volumes are removed or stabilization is acnieveo the sample should be taken wnen the water level in tree Weil recovers to 80 percent of its initial levei Retrieval of the water sample, sample handling ana sample preservation shall be conducted according to Standard Operating Procedure 10 concerning "Sampling for Volatiles in Water The sampling equipment used shall consist of a Teflon's and/or stainless steel samplers which meet U S Environmental Protection Agency (EPA) regulations Glass vials with Teflono lids should be used to store the coilected samples To ensure sample integrity each vial shall be filled with the sampled water in such a way that the water stands above the lip of the vial The cap should then be quickly placed an the vial and tightened securely The vial should then be checked to ensure that air bubbles are not present prior to labeling of the sample Label information should include a sample identification number, lob identification, date, time, type of analysis requested, and sampler's name Chain- of-custody records shall be completed according to Standard Operating Procedure (SOP) 11 concerning chain of custody The vials should be immediately placed in high quality coolers for shipment to the laboratory. The coolers should be packed with sufficient ice or freezer packs to ensure that the samples are kept below 4' Celsius (C) To minimize sample degradation the prescribed analysis shall take place within seven days of sample collection unless specialty prepared acidified vials are used. To minimize the potential for cross contamination between wells, all the well development and water sampling equipment which contacts the groundwater shall be cleaned between each sampling As a second precautionary measure, the wells shall be sampled in order of increasing contaminant concentrations (the least contaminated well first, the most contaminated well last) as established by previous analysis CONCORD SOP 121941 PJ-MGROUNDWATER r�' � TECHNOLOGY, INC