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_ <br /> �� _ <br /> �� . _...�� <br /> -11 <br /> a <br /> h <br /> KLEINFELDER <br /> .Ma <br /> boring to a point immediately above the desired sampling depth and then driving a <br /> Modified California Sampler lined with three brass tubes into the undisturbed soil. The <br /> sampler was removed from the bottom of the boring, and the bottom sample tube was <br /> sealed with Teflon sheeting and tight-fitting plastic caps, labeled, and placed inside an iced <br /> cooler. At the end of drilling operations,selected soil samples were delivered under chain- <br /> of-custody to California Analytical Laboratories/Enseco Inc., in West Sacramento. The <br /> remaining soil samples were retained in refrigerated storage for future reference or <br /> analysis. <br /> To reduce the potential for cross-contamination between borings, the augers and <br /> associated equipment were steam cleaned prior to drilling each boring. The sampling <br /> equipment was cleaned with a trisodium phosphate wash and a distilled water rinse prior to <br /> collecting each soil sample. At the completion of the sampling,each boring was backfilled <br /> to the surface with a sand-cement slurry. Soil removed from the borings was placed on and <br /> covered with plastic and left onsite. <br /> 3.2 QUALITATIVE FIELD SCREENING <br /> To provide a qualitative indication of contamination and assist in selecting samples to be <br /> analyzed,a portable organic vapor detector wos used to screen the samples in the field. A <br /> Photovac photoionization dett ctor(PID) was used to measure total ionizable compounds <br /> in parts per million by volume(ppmv)relative to an isobutylene calibration standard. <br /> Each sample was screened in tine`"eld,and the PID readings were recorded on the boring <br /> log. PID readings range from 0 to 600 with the highest cnncentrations recorded from <br /> samples collected at a depth of 20 to 23 feet below ground surface. A summary of the PID <br /> reading for each sample is presented in Table 1,Sample Identification and PID Log. <br /> For the protection of the field crew, the PID 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 /> consistent volatile concentrations were detected in the breathing zone. <br /> 3.3 SAMPLE ANALYSES AND RESULTS <br /> Soil samples were submitted under chain-of-colstody to California Analytical <br /> -� Laboratories/Enseco in West Sacramento to provide a quantitative assessment of <br /> 188-89-960 4 <br />