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Photovac photoionization detector (PID) and a flame-ionization detector (FID) were used <br /> to measure total ionizable compounds in parts per million by volume (ppmv) relative to a <br /> calibration standard. <br /> Each sample was screened in the field, and the PID and FID readings were recorded on <br /> the boring log. Organic vapor readings ranged from 0 to 3.5 ppmv. A summary of the PID <br /> and FID readings for each sample is presented in Table 1, Sample Identification and <br /> Organic Vapor Analyzer Log. <br /> -� For the protection of the field crew, the PID and FID were also used to measure the total <br /> volatile concentrations in the breathing zone prior to and during the drilling of the borings. <br /> No consistent volatile concentrations were detected in the breathing zone. <br /> ~ 3.3 SAMPLE ANALYSES AND RESULTS <br /> Soil samples were submitted under chain-of-custody to California Analytical <br /> Laboratories/ENSECO in West Sacramento to provide a quantitative assessment of <br /> petroleum hydrocarbon contamination. Two to three samples from each boring were <br /> -, submitted for analysis. Selection of the samples analyzed was based on field observations, <br /> depth in boring,and PID/FID field screening results.Fifteen of forty hvo samples collected <br /> were analyzed for total petroleum hydrocarbons(TPH) extractable (Method 3550) by GC- <br /> FID;oil and grease by gravimetric method;and benzene toluene,ethyl benzene, and xylene <br /> (BTEX)by EPA Method 8020. In addition polychlorinated biphenyls (PCBs), polynuclear <br /> aromatics (FNAs), pentachlorphenol (PCP), and creosote were analyzed by EPA method <br /> 8270; and lead, chromium, cadmium, and zinc were analyzed by inductively coupled argon <br /> plasma(ICP)spectrometer. . - <br /> Analytical laboratory results indicated that total petroleum hydrocarbons, and oil and <br /> grease were detected in samples collected from boring B-5 advanced east of the 500-gallon <br /> tank excavation. Diesel (53 mg/kg), oil and grease (243 mg/kg), and stoddard solvent (99 <br /> mg/kg)were detected in Boring B-5 at 11.5 feet. The concentrations decreased with depth <br /> in boring B-5, where total petroleum hydrocarbons (12 mg/kg) was the only constituent <br /> detected in at 21.5 feet. <br /> s ' Chromium and zinc were detected in the bottom samples from borings B-1 through B-4 at <br /> concentrations ranging from 29.9 to 64.9 mg/kg for chromium and 55.6 to 86.5 mg/kg for <br /> 241-89-2196 5 <br />