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SOP-012 Standard Operating Procedure Aquifer Testing Page 6 of 18 REVISION NO. 0 March 2020 Sharpe Army Depot The Contractor Quality Control Manager (CQCM) is responsible for periodic review of field generated documentation associated with this SOP. The CQCM is also responsible for the implementation of corrective action (i.e., retaining personnel, additional review of work plans and SOPs, variances to aquifer testing requirements, issuing nonconformances, etc.) if problems occur. Field personnel assigned to aquifer testing activities are responsible for completing their tasks according to specifications outlined in this SOP and other appropriate procedures. All staff are responsible for reporting deviations from the procedures to the Site Superintendent, Delivery Order Manager, or the CQCM. 3.2 Slug Test Method A slug test is an aquifer test in which the water level in a well is instantaneously changed by removing, adding, or displacing a known volume of water. The water level response is monitored over a period of time in the slugged well. The water level response is generally proportional to aquifer transmissivity and hydraulic conductivity. A known volume of water can be removed relatively rapidly from the well with a submersible pump or bailer. Potable water can be added rapidly to a well by directly dumping from barrels or holding tanks. However, the most common method used in environmental projects involves the insertion and removal of a solid slugging rod (or pig), which instantaneously displaces the water level inside the well. During testing, water levels may be measured with an electric tape if the wells recharge slowly. However, pressure transducers (with associated data loggers) are more commonly used to measure water levels as they can record a large number of measurements on a more rapid basis. Many brands of transducer/data logger packages have the ability to pre-program the rate of measurement, obtaining frequent measurements during the initial portions of the test and less frequent measurements near the end of the test as the water level slowly stabilizes. The procedures described below are written for use with a slugging rod and pressure transducer/data logger during slug testing. These procedures also cover both slug insertion and slug withdrawal portions of slug testing. In certain instances, only the slug withdrawal test data are used for analysis. However, it is advisable to still conduct the slug insertion test even if only using the withdrawal test data for evaluation of aquifer parameters. The slug insertion test can provide information to make necessary adjustments to the withdrawal test in the field.