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ARCADIS SOP: Groundwater Sampling Using HydroPunchTM 3 Rev.#: 01 1 Rev Date: March 3, 2009 • Drill casing or augers having an effective inside diameter of at least 1.25 inches(to be provided by drilling subcontractor) • Electronic water-level probe • Groundwater sample containers provided by the testing laboratory • Health and safety monitoring equipment and personal protective equipment • Materials for decontamination of the sampler between samples IV. Cautions Because the HydroPunchTM sampler is a groundwater sampling device, it must be used in saturated soils. Positive hydraulic head is required to fill the sampler, and the sampler may fill slowly or not at all at depths just below the water table. HydroPunchTM I and HydroPunchTM II in the"groundwater mode" cannot be used at sampling depths less than 5 feet below the water table. HydroPunchTA° II in the"hydrocarbon mode" is preferred for sampling at the water table. Some types of geologic materials may not allow effective use of the HydroPunchTM sampler, even at significant depth below the water table. For example, extremely dense soils or those containing cobbles or boulders may resist penetration of the sampler, precluding its use. Low permeability soil such as silt and clay may not produce groundwater at a sufficient rate to fill the HydroPunchTM sampler within a practicable timeframe. For these types of situations, an alternative approach should be considered, such as collecting a sample of saturated soil for analysis. Groundwater samples collected using HydroPunchTM should be considered screening- level data, suitable for obtaining a general understanding of groundwater quality and selecting depths for monitoring well screens. Samples obtained using HydroPunchTM are commonly more turbid than those produced from installed, developed monitoring wells. Higher turbidity could affect sample quality if samples are to be analyzed for sorptive analytes such as polychlorinated biphenyls(PCBs), polycyclic aromatic hydrocarbons(PAHs), pesticides or metals. For these types of analytes, unfiltered HydroPunchTM samples could produce concentrations that are higher than those of sediment-free aquifer water. Field or laboratory filtering of the samples obtained for these types of constituents should be considered. For less-sorptive analytes(volatile organic compounds, anions such as chloride, etc.), sample turbidity is unlikely to adversely impact the direct usability of unfiltered samples. g:%op-library4e(ormatted sops 2008\hydrogeology sops\398782-groundwater sampling using hydropunch doc