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WEISS ASSOCIAIES _ <br /> Richard O. Norona 10 <br /> May 16, 1989 <br /> Tanks I and 6 <br /> For Tanks I and 6, we propose to drill one deep angle boring beneath each tank. <br /> Samples from approximately 15, 20, 25, and 30 ft depths in the angle borings will be collected <br /> for laboratory chemical analysis. The samples will be screened in the field using a PID. <br /> The Tank 1 and 6 samples will be analyzed for ethylene and propylene glycol by gas <br /> chromatography/flame ionization detection using a "DB Wax" mcgabore-type column. <br /> Tank 8 <br /> We will also drill one angle boring beneath Tank 8 and one deep vertical boring at the <br /> tank edge, as described in Task 1 above. The angle boring will be drilled beneath the tank <br /> to about 35 ft depth. Samples collected at about 20, 25, 30 and 35 ft depth from the angled <br /> boring will be analyzed in the laboratory. <br /> Tank 8 soil samples will be analyzed for soluble hexavalent chromium by EPA Method <br /> 7196, colorimetric determination, and for total calcium and chloride by atomic absorption <br /> (AA). <br /> TASK 3 - REPORT <br /> A report presenting the results of the investigation will be prepared. the report will <br /> include: <br /> • A summary of the results. <br /> • Diagrams showing the sample locations. <br /> • Descriptions of all work performed including discussions of any changes or <br /> modifications to the original plan. <br /> • Tabulated analytic results. <br /> • Conclusions. <br /> • Boring logs. <br /> • Chain-of-custody forms and analytic reports. <br />