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V Mid BENCH TEST MEDIA COLLECTION Representative soil samples from selected borings will be collected from the core of the soil source area. Although saturated soils can be used, it is difficult to transport and work with saturated soil samples. Therefore, representative groundwater collected from the core area of the hydrocarbon plume should be evaluated in the bench-scale treatment using a modified Fenton's reagent (hydrogen peroxide and catalysts). • Collection of soil samples: approximately five 12" sections of 1 .5- to 2.0-inch diameter soil cores (the volume equivalent of about 2 gallons of total solid material in the vadose zone). • Groundwater samples will be collected in two 5-gallon containers from either temporary or permanent well locations. The amount of water required to saturate the well cuttings will be determined visually in the bench test laboratory. Typically, soils will require several milliliters (mL) of water per 10 g of soil or a few hundred milliliters of groundwater per kilogram of soil (for example, 2 mL/10 g of soil or 200 mL/kg of soil). Excess water will be needed in case the analysis requires repeating. FIELD MEASUREMENTS IN REPRESENTATIVE BORING Groundwater measurements (field or laboratory) will include dissolved oxygen (DO), i oxidation-reduction potential (ORP), and dissolved iron readings for all wells and - temporary wells on-site. In the field, measurements of DO and ORP should be collected using a downhole meter. FeT°`" and Fee+ can be measured in the field using a Hach colorimetric kit or similar. LABORATORY ANALYSIS Care-should-betaken-to-select-discrete-soil-samples-that are-representative-ofthe-site.Itis recommended that the borings be continuously cored for lithologic and hydrogeologic characterization. Samples will be prepared and submitted to the project laboratory for analysis of the required constituents of concern. The initial chemical analysis will be used to determine whether the contamination is primarily found in the groundwater with very little sorbed to the soil cuttings or whether most of the contamination is sorbed to the soil matrix. The remaining portions of the soil cores will be composited in the bench test laboratory. The purpose of the soil compositing is to ensure that the soil used in the bench testing will be as representative as possible. From the composite soil, a baseline soil sample will be collected. Groundwater will also be collected for a baseline sample. Samples will be collected for the petroleum hydrocarbons, as well as the following: Total organic carbon (TOC) and total inorganic carbon (TIC) both by EPA Method 415 , 1 , and speciated alkalinity tests will be performed in the laboratory by SM2320B. 3