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T <br /> GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> - CONCERNING WATER SAMPLING ME'T'HODOLOGY <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 pH. Ii 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 Drell recovers to 80% of its initial 3evel. <br /> Retrieval of the water sample, sample handling and sample <br /> preservation shall be conducted in8accordantandard ce <br /> with <br /> ting <br /> Groundwater Technology Laboratory <br /> Procedure (GTL SOP 10) ooneceinimnentS�dedishallrconsist lof <br /> in Water The sampling p <br /> a teflon and/or stainless steel eamplers, whit} accts <br /> W- EPA regulations. Glass vialted s wit.-, teflon lids should be <br /> used to store the <br /> 3'o insure sample integrity, each vial shall be filled liP <br /> with <br /> the sampled water such that the water stands above <br /> placedthe <br /> the <br /> of the vial. The cap should then be qu <br /> vial and tightened securely. The vial. should then be <br /> checked to ensure that air bLablelsinformationre not eshoulsent driti <br /> to labeling of the sample. <br /> include a sample identification uemted�andbthe esampler's <br /> an, <br /> date, time, type of analysis rel be qu <br /> name. Chain-of-Custody forms shalStandard pper <br /> operating <br /> Groundwater Technology Laboratory► <br /> Procedure (Sop 11) concerning Chain of Custody. <br /> laced in h quality <br /> The vials should be immediately p The coolers <br /> coolers for shipment to the laboratory. <br /> should Ls peaked with sufficient ice or freezer Samppackses to <br /> ensure that the samples are kept below ,4 Laboratory <br /> are received at the Groundwater Technc±lugy Laboratory <br /> ,above 10 Crawill dationethenprescribedsidered ba:�alysi .shall To mtake <br /> ize <br /> sample deg s of sample collection unless <br /> f plat® within seven day <br /> spocially prepared acidified vials are used. <br /> etween <br /> To minimize the Poteneveloial finentor ross contamination band water S amplingequip- <br /> wells, call the well d Pcleaned <br /> went which contacts the groundw atesecondlprecautionary <br /> -- between each well sampling. <br /> measure, the wells shall be sampled in ortablished by previous <br /> der of reviousincrekeg <br /> contaminant concentrations as es <br /> analysis. <br /> �'�� Genr�nuasEx <br /> =J Tecr�,u,„cti,iu <br /> S <br />