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iGROUNDWATER TECHNOLOGY STANDARD OPERATING PROCEDURE CONCERNING WATER SAMPLING METHODOLOGY SOP 9 Prior to water sampling, each well Lhall be purged by w pumping a minimum of four well volumes or until the discharge water indicates stabilization of temperature, conductivity,and pH. If the well is evacuated before four well volumes are removed or stabilization is achieved, the sample should be taken when the water level in the well recovers to 80% of its initial level. Retrieval of the water sample, sample handling and sample preservation shall be conducted in accordance with Groundwater Technology Laboratory Standard Operating Procedure (GTL SOP 10) concerning Sampling For Volatiles in Water". The sampling equipment used shall consist of a teflon and/or stainless steel samplers, which meets EPA rFgulations. Glass vials with teflon lids should be used to store the collected samples. To insure sample integrity, each vial shall be filled with the sampled water such that the water stands above the lip of the vial. The cap should then be quickly placed on the vial and tightened securely. The vial should then be checked to enstire that air bubbles are not present prior to labeling of the sample. Label information should include a sample identification number, job Identification, date, time, type of analysis requested and the sampler's name. Chain-of-Custody forms shall. be completed as per. Groundwater Technology Laboratory 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 SSC. Samples which are received at the Groundwater Technology Laboratory above le c. will be considered substandard. To minimize sample degradation the prescribed analysis shall take place within seven days of sample collection unless specially prepared acidified vials are used. To minimize the potential for cross contamination between wells, all the well development and water sampling egE:ip-- ment which contar;ts the groundwater shall be cleaned between each well sampling. As a second precautionary measure, the wells shall be sampled in order of increasing _. . contaminant concentrations as established by previous analysis. x+'r