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KLEINFELDER <br /> soil encountered in each boring, and identification of the sample intervals are presented on <br /> the Logs of Borings, Plates 8 through 18, Appendix A. Soil encountered in the borings was <br /> predominantly clay, silt, and fine sand. <br /> Soil samples were collected at depths of 1, 3, and 5 feet in the central and radial borings. <br /> Additional samples were collected at 10 and 15 feet in the central borings. Samples were <br /> collected by advancing the boring to a point immediately above the desired sampling depth <br /> and then driving a Modified California Sampler lined with three brass tubes into the <br /> undisturbed soil. The sampler was removed from the bottom of the boring and the bottom <br /> (third) tube was covered with Teflon and tight-fitting plastic caps, labeled, and placed <br /> inside an iced cooler. <br /> To minimize the potential for cross-contamination between borings, augers and associated <br /> equipment were steam cleaned prior to the drilling of each boring. The sampling <br /> equipment was cleaned with a trisodium phosphate wash and distilled water rinse prior to <br /> collecting each soil sample. <br /> Cuttings from the borings were wrapped in plastic and left on site. Upon completion of the <br /> drilling activities, the borings and monitoring wells were backfilled with a cement grout to <br /> minimize the potential for surface water infiltration. <br /> 3.1.2 QUALITATIVE FIELD SCREENING <br /> To provide a qualitative indication of contamination, a portable organic vapor detector was <br /> used in the field to screen soil samples. A flame ionization detector (FID) was used to <br /> measure hydrocarbon compounds in parts per million by volume (ppmv). The FID reading <br /> for each sample was recorded on the Log of Boring. Qualitative screening is used to assist <br /> in the selection of samples to be submitted for chemical analysis. No FID readings were <br /> observed from any of the samples screened in the field. <br /> For the protection of the field crew, the FID was also used to measure the total volatile <br /> concentrations in the breathing zone prior to and during the drilling of the borings. No <br /> volatile concentrations were detected above 1 ppmv in the breathing zone. <br /> 161-89-107 5 <br />