ARCHIVED REPORTS_XR0012598 - Laserfiche WebLink

Home Browse Search

GROUNDWATER TEC.INOLOGY STANDARD OPERATING PROCEDURE CONCER14ING 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 stabilization of temperature, discharge water indicates conductivity,and pH. 1'f the well is evacuated before `our 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 samole, 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 sampies. 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 can should then be quickly placed an 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, ;ob 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 o- Custody. 1 The vials should be immediately placed in high quali'_y coolers for shipment to the laboratarv. The coolers should be packed with sufficient ice or freezer ?ask: to s which ensure that the samples are kept below 4C- Samp_es are received at the G,oundwa_e~ Technoiocy Laborator': above 10 C. will be considered substandard. To Minimize sarple degradation the prescribed analysis shall take glace within saven days o sample collection unless soecially prenzred acidified v'-ais are used. To minimize the potential for cross contamination between wells, all the well development and water sampling equ-p- ment which contacts the grou,:dwater shall be cleaned between each well samDling. As a second precaun'onary _ measure, the wells shall be sampled in order of increasing contaminant concentrations as established by previous analysis.