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SECTION 2 METHODOLOGIES USED DURING RECENT SOIL AND GROUNDWATER INVESTIGATION ' This section outlines the methodologies used during the soil and groundwater sampling that was performed by ERM-West during November and December 1990 During this stage of the investigation, ' 25 soil borings, labeled MP-1 through MP-25, were installed and sampled Six of these borings were converted to 4-inch-diameter monitoring wells Three of these wells have been sampled, and ' additional groundwater samples were collected using a hydropunch The soil and groundwater sampling was performed in order to better define the extent of contaminated soil remaining at the site and determine if groundwater had been impacted by the product in the soil. The scope of work for this stage of the investigation consisted of the installation of soil bonngs, soil sampling, sampling of stockpiled soil, handling of drill cuttings, abandonment of boreholes, groundwater level measurements, groundwater duringple the completion collection, and sample analysis The methodologies g of each of these tasks are presented separately below. Soil Boring Installation Twenty-five soil bonngs were installed around the perimeter of the ' existing excavation as shown in Figure m1-2. lllbonngs were ollow tem installed using truck-mounted drill ngs eQpp ed with th hollow to the auger The soils from the borings will be logged according Unified Soil Classification System (Appendix D). Drilling logs were completed based on information obtained from drill cuttings, actual soil samples, andeformer orm rnttank siin te were identified prior to proceons of eding eding ' utilities on the fo with the soil investigation All borings were advanced to the depthundwater samples the first were red unconfined groundwater. In addition, gr collected from selected borings using a hydropunch. ' 2-1