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GROUNDWATER TECHN0LOGY STANDARD OPERATING PROCEDURE E CONCERNING WATER SAMPLING METHODOLOGY SOP 9 Prior to water sampling, each well shall be purged by pumping a minimum of four well volumes or until the discharge water indicates stabilizacion 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 808 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 regulations. 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 ensure 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 Cham of Custody. The vials should be immediately placed in 'high Quality coolers for ehipment to the laboratory. The coolers should be packed with sufficient ice or freezer packs to ensure that the samples are kept below 4C. Samples which are received at the Groundwater Technology Laboratory above 10 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 4 wells, all the well development and water sampling equip- ment which contacts 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. r,