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Aquifer Testing Standard Operating Procedure SWE-FSOP-500,•Revision 0 Ahtna Southwest Environmental Operations • Timing device • Tools to open wells • Vehicle battery(or external power supply)to power pump with pump controller 4.0 Procedures This section contains responsibilities, requirements, and procedures for conducting aquifer testing. Slug, specific capacity, and pumping tests are commonly used testing methods to determine the hydrologic characteristics of confined and unconfined aquifers. Consequently, these methods are covered in this section. 4.1 Preparation All aquifer testing to be conducted at a site must incorporate and be tailored to the following: • Known or expected site-specific conditions • Targeted parameters to be evaluated • Analysis method ology(ies)to be conducted with the test data Consequently, these factors must be considered, and the tests must be designed well before developing the project work plans and implementation in the field. The project work plans will specify all necessary details to complete the aquifer testing at a particular site. Aquifer testing information and specifications in the project work plans will describe, at a minimum, the following: • Objectives of the aquifer testing • Aquifer parameters to be evaluated • Type(s) of aquifer tests to be conducted • Exact wells to be used for aquifer testing • Equipment types and requirements • Type, duration, and frequency of measurements to be made • Additional procedures or requirements beyond those covered in this SOP Decontaminate all equipment that could come into contact with the well or groundwater and calibrate all instruments before obtaining field data according to SWE-FSOP-801 (Equipment Decontamination) and SWE-FSOP-107 (Equipment Calibrations), respectively. Equipment in contact with groundwater at one location must be decontaminated before reusing at another location. [PFAS Project]: Reusable non-dedicated equipment will be rinsed with certified PFAS-free water before and after use. If another water source is used, collect a water sample and run laboratory tests for PFAS before using that source. The following requirements, responsibilities, and procedures described in the next section must be incorporated into the aquifer testing conducted at each site. Page 8 of 17