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f <br /> KLEiNFELDER <br /> APPENDIX B <br /> FIELD PROCEDURES <br /> E B-1 OBJECTIVE <br /> i Soil samples were collected from selected depths below ground surface for chemical <br /> ' analysis,field screening,visual observations,and iithologic correlation. i <br /> 1 <br /> M B-2 DRILLING AND SAMPLING <br /> Soil borings were advanced using a truck-mounted drill rig equipped with 8-inch hollow <br /> x ? stem augers. During drilling, an experienced environmental geologist classified soils, <br /> collected soil samples for laboratory analysis and logged the boreholes. <br /> To reduce the potential for cross-contamination, augers and associated equipment were <br /> steam cleaned prior to the drilling of each boring. In addition, sampling equipment was ; <br /> cleaned with a trisodium phosphate wash and rinsed with distilled water prior to the <br /> !! collection of each soil sample. <br /> 6� <br /> Soil samples were collected approximately every S feet, (or as site conditions and lithology <br /> dictated), for field screening, lithologic logging and potential chemical analysis. Soil s <br /> samples were collected by advancing the boring to a point immediately above the desired <br /> f1l sampling depth and then driving a Modified California Sampler, lined with three brass <br /> r tubes, into the undisturbed soil. The sampler was then removed from the bottom of the <br /> boring. The bottom(third) tube was sealed with Teflon and tight-fitting plastic caps. The <br /> 73 <br /> sealed tube was immediately stored in an iced cooler for possible chemical analysis. Soil <br /> " samples for chemical analysis were delivered under chain-of-custody control to a laboratory <br /> certified by the Department of Health Services for the required analyses. j <br /> S <br /> S <br /> Y <br /> f - EBMUD-001-89.001 B-1 <br />