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SOP-012 Standard Operating Procedure Aquifer Testing Page 7 of 18 REVISION NO. 0 March 2020 Sharpe Army Depot The procedures described below are readily adaptable for the other slug testing methods. The project work plans will outline specific slug testing methods and procedures to be used. • Any newly installed wells to be slug tested must be developed before beginning slug testing activities. • Inspect the equipment to ensure that it is in good working order. Aquifer slug test equipment will vary widely depending on the formation, other site conditions, the diameter and depth of the wells, and the number of the wells to be tested. The project work plans will outline the type of equipment to be used. • All measuring and testing equipment (M&TE) used for field activities will be calibrated by the equipment manufacturer or an approved calibration laboratory using standards that are traceable to the National Institute of Standards and Technology (NIST). Certificates of calibration for M&TE will be obtained from the M&TE supplier and kept in the project files. No M&TE will be utilized without verification of calibration certification. • Decontaminate all downhole equipment according to SOP No. 003 In the event that the contaminant histories of the wells to be tested are known or anticipated, the slug tests should be performed, starting with the least contaminated well and ending with the most contaminated. It is recommended to replace braided rope or line that has been submerged during slug testing of one well before moving on to another well. These practices will reduce the potential for cross-contamination between wells. • Visually inspect and access the wellhead per SOP No.008. • Obtain a water level depth measurement and sound the bottom of the well according to the procedures outlined in SOP No. 008. Compare the measured total depth to the bottom of the well with the well construction diagram to determine if sediment is at the bottom of the well. It is important not to set the pressure transducer in the sediment. • Calculate the height of the water column in the well as follows: o (h1 - h2) = height of water column in well, where  h1 = total depth of well from top of casing (in feet)  h2 = depth to water from top of casing (in feet) • The height of the water column should be sufficient to totally immerse the slugging rod and also allow concurrent use of a pressure transducer or other measuring equipment during the testing. • Connect the pressure transducer to the data logger. Install the pressure transducer in the water column to a depth that will not interfere with the insertion or withdrawal