Laserfiche WebLink
�...� <br /> MOR <br /> HEa< - . <br /> I <br /> SECTION 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 this stage of the investigation, <br /> 25 soil borings, 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 havn 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 anO <br /> determine if groundwater had been impacted by the product in the <br /> soil. 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 /> i� of each of these tasks are presented separately below. <br /> Soil Boring Installation <br /> Twenty-five soil borings were i <br /> nstalled around <br /> theP erimeter of the <br /> existing excavation as shown in Figure 1-2. All borings were <br /> installed using truck-mounted drill rigs equipped with hollow stem <br /> auger. The soils from the borings will be logged according to the <br /> Unified Soil CIassification System (Appendix D). Drilling logs were <br /> completed based on information obtained from drill cuttings, actual <br /> illing characteristics. Locations of <br /> soil samples, and changes in dr <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 were <br /> collected from selected borings using a_hy_dropunc--h_ <br /> 2-1 <br />