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" n GROUNDWATER TECHNOLOGY S'T'ANDARD OPERATING PROCEDURE a CONCERNING WATER SAMPLING METHODOLOGY SOP 9 ` Prior to water sampling, pumping a minimum of four ewell ach wvolumes ell l"or buntilged theby 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 regulations. Glass vials with teflon lids should be i used to store the collected samples. i 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 beuickl a� vial and tightened securely. The vial shoopthence the t checked to ensure that air bubbles are not �:- present to labeling of the sample. Label informationshoulrior include a sample identification number date time , jab identification, , type of analysis requested and the sampler's name. Chain-of-Custody forms shall be completed as per a Groundwater Technology Laboratory Standard Operatin Procedure (SOP 11) concerning Chain of Custody. g The vials should 'be immediate) �i y placed in high quality - coolers for shipment to the laboratory. The-coolers should be packed with sufficient ice or freezer packs to ri ensure that the samples are kept below 4C. Samples which r are received at the Groundwater Technology Laboratory above 10 C. will be considered]e. de substandard. _-To-minimize - . - samp _ radatzon thee g prescribed "analysis shall take Place within seven Bays of sample collection unless specially prepared acidified v al.s are .used. ' i To -minimize the potential for cross contamination between wells, all the well development and water sampling equi meet which contacts the .groundwater shall be cleanedp ' 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.