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KennedyJenks Consultants <br /> be continuously logged in accordance with the USCS Visual-Manual Procedure <br /> (ASTM D2488-93). Soil conditions in each borehole will be recorded on a boring log. Soil <br /> samples will be selected from each boring for laboratory analysis based on field <br /> observations including odor and color. Samples will also be analyzed in the field for <br /> headspace gasses using a portable organic vapor analyzer. <br /> Kennedy/Jenks has assumed that the soil borings will be terminated at 20 feet bgs. <br /> However, if field observations indicate that soils are potentially impacted by chemicals of <br /> concern below 20 feet bgs at any location, that boring may be advanced deeper to collect <br /> additional soil samples and/or a reconnaissance groundwater sample. <br /> 2.2.3 Reconnaissance Groundwater Sampling <br /> Three additional borings (SB-8, SB-9, and SB-10) will be drilled to first-encountered <br /> groundwater (approximately 50 feet bgs) using the hollow stem auger rig for the purpose of <br /> collecting reconnaissance groundwater samples. The reconnaissance groundwater <br /> sampling techniques are described in Appendix C. The proposed groundwater sampling <br /> locations are shown on Figure 1. <br /> Soil Boring SB-8 will be installed at the southwestern corner (upgradient corner of the <br /> subject site) to assess the groundwater quality of the shallow groundwater entering the <br /> subject site. Soil Borings SB-9 and SB-10 will be installed at the presumed downgradient <br /> boundary (north, northeast) of the subject property, downgradient of potential onsite source <br /> areas. The purpose of Soil Borings SB-9 and SB-10 is to assess the groundwater quality <br /> of the shallow groundwater leaving the subject site downgradient of potential source areas. <br /> In addition, during the collection of the reconnaissance groundwater samples, one each of <br /> the following quality control/quality assurance (QA/QC) samples will be collected and <br /> submitted for analysis. <br /> • Travel blank <br /> • Field duplicate <br /> • Field blank <br /> 2.2.4 Management of Investigation-Derived Residuals <br /> Kennedy/Jenks anticipates generating up to four 55-gallon drums of soil cuttings and one <br /> 55-gallon drum of groundwater purge/equipment decontamination water. The material will <br /> be placed in DOT approved drums and labeled as to their contents. Appropriate disposal <br /> of the residuals will depend upon concentrations of constituents of concern found in the <br /> samples collected. <br /> 2.3 Sample Handling and Laboratory Analyses <br /> All samples collected for laboratory analyses will be stored at 4°C in pre-cleaned coolers. <br /> Standard chain-of-custody procedures will be followed when the samples are transmitted to <br /> a California certified analytical laboratory. <br /> After collection, the sample will be labeled, placed in a watertight bag and, immediately <br /> place on ice in a cooler for temporary storage. At the end of each day, and prior to the <br /> i:\job\96\966070.00\workplan\text.doc 4 <br />