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SEC'T'ION 2 <br /> METHODOLOGIES USED DURING <br />' RECENT SOIL AND GROUNDWATER <br /> INVESTIGATION <br /> This section outlines the methodologies used during the soil and <br /> groundwater sampling that was performed by ERM-West during <br /> November and December 1990 During th-is stage of the investigation, <br />' 25 soil bonngs, labeled MP-1 through MP-25, were installed and <br /> sampled Six of these borings were converted to 4-inch-diameter <br /> monitoring wells Three of these wells have been sampled, and <br />' additional groundwater samples were collected using a hydropunch <br /> The soil and groundwater sampling was performed in order to better <br /> define the extent of contaminated soil remaining at the site and <br />' determine if groundwater had been impacted by the product in the <br /> sail The scope of work for this stage of the investigation consisted of <br /> the installation of soil borings, soil sampling, sampling of stockpiled <br /> soil, handling of drill cuttings, abandonment of boreholes, <br /> groundwater level measurements, groundwater sample collection, <br /> and sample analysis The methodologies used during the completion <br /> of each of these tasks are presented separately below <br /> Soil Boring InstaIlation <br /> Twenty-five soil borings were installed around the perimeter of the <br /> existing excavation as shown in Figure 1-2 All borings were <br /> installed using truck-mounted drill ngs equipped with hollow stem <br /> auger The soils from the borings wall be logged according to the <br /> Unified Soil Classification System (Appendix D) Drilling logs were <br /> completed based on information obtained from drill cuttings, actual <br /> soil samples, and changes in drilling characteristics Locations of <br /> utilities on the former tank site were identified prior to proceeding <br /> with the soil investigation <br />' All borings were advanced to the depth of the first encountered <br /> unconfined groundwater In addition, groundwater samples 'Aere <br /> collected from selected borings using a hydropunch <br />' 2-1 <br />