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1 <br /> Murray & Associates <br /> ' STANDARD OPERATING PROCEDURE <br /> CONCERNING GROUNDWATER MONITORING <br /> SOP 2 <br /> Prior to water sampling, each well shall be purged by pumping a minimum of four well volumes <br /> ' or until the discharge water indicates stabilization of temperature, conductivity, and pH If the <br /> well is evacuated before four well volumes are removed or stabilization is achieved, the sample <br /> should be taken when the water level in the well recovers to 80 percent of its initial level <br /> Retrieval of the water sample, sample handling and samplereservation shall be conducted P t d in <br /> accordance with Department of Health Services certified and EPA Laboratory Standard <br /> ' Operating Procedure (see SOP 3) concerning "Sampling for Violatiles in Water " The sampling <br /> equipment used shall consist of a teflon and/or stainless steel samplers, which meets EPA <br /> regulations Glass vials with teflon lids should be used to store the collected samples <br /> To insure sample integrity, each vial shall be filled with the sampled p water such that the water <br /> stands above the lip of the vial The cap should then be quickly placed on the vial and <br /> tightened securely The vial should then be checked to ensure that air bubbles are not present <br /> prior to labeling of the sample. Label information should include a sample identification <br /> number, fob identification, date, time, type of analysis requested and the sampler's Standard <br /> Operating Procedures (SOP 4) concerning Chain of Custody <br /> The vials should be immediately placed in high quality coolers for shipment to the: laboratory <br /> 1 The coolers should be packed with sufficient ice or freezer packs to ensure that the samples are <br /> kept below 40C Samples which are received at an analytical laboratory above IOQC will be <br /> considered substandard To minimize sample degradation the prescribed analysis shall take place <br /> within seven days of sample collection unless specifically prepared acidified vials are used <br /> ' To minimize the potential for cross contamination between wells, all the well development and <br /> water sampling equipment which contacts the groundwater shall be cleaned between each well <br /> sampling As a second precautionary measure, the wells shall be sampled in order of increasing <br /> contaminant concentrations as established by previous analysis <br />