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mom 1R' <br /> KLEINFELDER <br /> I:,A <br /> Drilling and Samplina <br /> The being was advanced using a Lruck-mounted drill rig equipped with 8-inch hollow stem <br /> augers. Samples were collected at 5-foot intervals by advancing the boring to a point <br /> immediately above the desired sampling depth and driving a Modified California Sampler <br /> lined with three brass tubes into the undisturbed soil. The sampler was ther removed from <br /> the bottom of the boring, and the bottom (third) tube was sealed with aluminum foil and <br /> tight-fitting plastic caps,labeled, and placed inside an iced cooler. Soil contained in the top <br /> two tubes was logged by an experienced environmental geologist using the Unified Soil <br /> Classification System(USCS)and was screened for organic vapors. The USCS is displayed <br /> on Plate 5. The boring log.for B-17 is shown on Plate 6. Organic vapor screening <br /> procedures are discussed in the following section. <br /> To minimize the potential for cross-contamination between borings,augers and associated <br /> equipment were steam cleaned prior to drilling each boring. The sampling equipment was <br /> cleaned with a detergent wast: and a distilled water rinse prior to collecting each soil <br /> sample. At the completion of the sampling, the boring was backfilled to the surface with <br /> cement grout. <br /> At the end of the drilling operations, the soil sample collected from a depth of 15 feet was <br /> delivered under chain-of-custody to Chemwest Analytical Laboratories, Inc. This sample <br /> was selected based on dati from previous investiga' ans: The sample was submitted for <br /> analysis of volatile aromatic hydrocarbons by EPA Method 8020 and TPH by vC-FID. <br /> The analytical results are presented in Section 4 and laboratory data sheets and chain-of- <br /> custody <br /> hain-ofcustody are included in Appendix C. <br /> Qualitative Field Screening <br /> . A port:.ble organic vapor detector was used in the field to provide a qualitative indication <br /> of contamination and assist in selecting samples to be analyzed. A photoionization <br /> detector (PID) with a.10.6 eV photoionization lamp was used to measure total ionizable <br /> compounds in parts per million by-olume (ppmv) relative to a select standard. A 25 ppm <br /> benzene calibration gas was used as the calibration standard for relative comparison of the <br /> -.,-°--- --field.readings.--------. .---- - --- --- -- ------- - <br /> a: 113-88-908 7 <br />