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c. APPENDIX A PROCEDURES FOR SOIL SAMPLING AND HEADSPACE MEASUREMENTS Soil Sampling a Relatively undisturbed soil samples were collected with a 24-inch long piston soil sampler lined with 1.0-inch diameter vinyl acetate tubing. During each sampling event, the sampler was driven a total of approximately 24 inches with a 110-foot pound hydraulic hammer. • An undisturbed section of the filled vinyl acetate tube was removed and capped on each end with TEFLON® sheeting and polyethylene endcaps. The endcaps were then secured with duct tape. • The top of each collected sample was labeled with the sample number, date, project number; and then placed in an ice chest maintained at 40 to 50 degrees Fahrenheit. Soil samples were then delivered to a State of California, Department of Health Services certified laboratory under strict chain-of-custody procedures. All soil sampling equipment was steam cleaned between 'sampling events. 'r AaacQ Measurements G Soil from the sampling tube of each driven sampler was extracted for headspace analysis directly into a brass tube. The tube was filled approximately one fifth with soil and secured with end-caps. i The soil in the tube was dis-aggregated by shaking, end then allowed to sit for approximately 3 to 5 minutes, at which time the probe of a field organic vapor meter (OVM) was inserted Through a covered hole In the endcap, and a headspace measurement taken and recorded. The OVM used during the project was a RAE SYSTEMS;' INC., MiniRAE Plus Classic, Model no. PGM-7815, equipped with a photo-ionization detector calibrated to 100 ppmv of isobutylene. �I The brass tube and endcaps were washed between each headspace measurement with a solution of water and LIQUINOX®(a phosphate free detergent), rinsed with potable tap water, rinsed again with de-ionized water, and then air-dried. Proj. No.: 04483-01 QEM