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• i Section 2 Proposed Hydrogeologic Investigation 2.3 FIELD AND LABORATORY TESTING OF HYDROGEOLOGIC PARAMETERS 2.3.1 SOIL PHYSICAL AND MINERALOGICAL TESTING Representative soil samples will be collected from the new monitoring well borings and submitted for select laboratory analysis of physical and chemical characteristics. The physical properties to be assessed include dry bulk density, field capacity,porosity, specific yield, grain size distribution, and hydraulic conductivity. Field identification of minerals will also be assessed in order to estimate minerals present within the aquifer/soil matrix. Laboratory analysis for total organic carbon, cation exchange capacity, and extractable iron and manganese oxides, in conjunction with extractable trace metals,will be also be conducted to evaluate the potential sorptive properties of the soil and to evaluate the potential release of sorbed species through associated disposal practices. 2.3.2 GUELPH PERMEAMETER TESTING Approximately five USDA soil types/subtypes underlie the potential storage and/or disposal areas indicating the potential spatial variability of soil properties at the sites. Between fifteen to twenty five field permeameter tests (a minimum of three for each major soil type)will be conducted to characterize the in-situ,undisturbed field hydraulic conductivity of site soils. The sample locations will be chosen to roughly approximate a grid over the property and will be conducted within the upper 0.5 to 5 feet of soil. The Guelph Permeameter will be employed to characterize shallow field hydraulic conductivity of the soil and further identify suitable disposal or re-use sites. The Guelph Permeameter is a constant head borehole permeameter that uses a two head simultaneous solution to estimate in-situ field hydraulic conductivity within a 6 cm diameter borehole as described in ASTM D5126-90. The Guelph Permeameter is well suited for rapidly estimating in-situ field hydraulic conductivity of soils within the range of 10.2 to 10-6 cm/sec. The Guelph Permeameter tests will be conducted using the standard procedure constant heads and borehole diameter(5 cm and 10 cm, and 6 cm diameter). Samples of field data sheets to be used for this procedure are contained in Appendix C. 2.3.3 DOUBLE RING INFILTROMETER TESTING As a supplement to the Guelph Permeameter, the Double Ring Infiltrometer will be used to evaluate clean water infiltration rates for soils at five locations at the Main Stone site. In accordance with ASTM standard D 3385—03,two open cylinders will be driven into the ground at a depth of one to three feet and partially filled with water, maintaining the liquid at a constant level within the inner ring. The volume infiltrated during timed intervals will be converted to either inches per hour or centimeters per hour plotted versus elapsed time. Each of these factors would be subject to change in the field based on the soil type. This method is useful for field measurement of the infiltration rate of soils which can be applied to liquid waste disposal, evaluation of potential septic-tank disposal fields, leaching and drainage efficiencies, irrigation May 2006 Main Stone Property 2-3 Effluent Storage and Disposal Site HydrogeolDgic Investigation Workplan