Laserfiche WebLink
3.1.3 Phase III Objectives <br /> • Identify the lithology variation across the site by logging the <br /> injection wells, monitoring tubes, lysimeters, and the extraction <br /> well . <br /> • Retrieve soil samples for the following chemical and physical <br /> analyses: <br /> - arsenic, copper, hexavalent chromium, and total chromium <br /> concentrations <br /> - dry bulk density, specific gravity, and gravimetric moisture <br /> content <br /> • Retrieve ground water samples from extraction wells for chemical <br /> analyses. <br /> 3.1.4 Phase IV Objectives <br /> • Identify and monitor the chemical characteristics of the pore water <br /> and ground water. <br /> • Monitor the degree of saturation by periodically utilizing neutron <br /> probe equipment. <br /> • Monitor lateral migration of flushed water. <br /> • Monitor and assess the total effectiveness of the soil flushing <br /> activities. <br /> • Continue operation of subsurface soil flushing until hexavalent <br /> chromium concentrations within the pore water and the ground water <br /> have reached steady state conditions. <br /> 3.2 SAMPLING PROCEDURES AND ANALYTICAL METHODS <br /> Subsurface soil , ground water, and pore water samples will be collected <br /> during implementation of subsurface soil remediation activities at the <br /> retort pit. The collection methods, and analytical , preservation, and <br /> container requirements for these samples are presented in the following <br /> subsections. Table 3-1 presents the laboratory analyses, sampling <br /> containers, sample preservation requirements, and allowable holding times <br /> for soil and water samples in accordance with 40 Code of Federal <br /> Regulations 135. <br /> 3.2.1 Subsurface Soil Sampling <br /> The objective of subsurface sampling is to obtain soil from known depths <br /> and lithologies to evaluate the site hydrogeologic characteristics and <br /> obtain information on the concentration of contaminants within these <br /> soils. Table 3-2 presents the subsurface soil sampling to be conducted <br /> during the implementation of the flushing system as discussed below. <br /> 11654.652 3-2 <br />