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0 <br /> Fe rk%N12EINC. SACRAMENTO <br />' in the field for lithology, color, relative moisture content, and <br /> visual and olfactory indications of the presence of petroleum <br /> hydrocarbon constituents. The results of the examinations and <br /> soil descriptions are included on the drilling logs in <br /> Appendix B. <br /> HeadsP ace measurements of soil from each sample were made in <br /> the field using a portable organic vapor analyzer (OVA) (Foxboro <br /> Century OVA 128GC) . The response factor of the OVA was set so <br /> that the instrument would read in parts per million (ppm) as <br /> compared to a standard of isobutylene. A portion of the soil <br /> sample was placed in a polyethylene ZiplocTM bag, the bag was <br />' sealed, then the soil was broken up and agitated. The bag and <br /> contents were then warmed in the sun for approximately 10 <br />' minutes, then the OVA probe was inserted into the bag. The <br /> highest OVA reading for each sample was recorded on the geologic <br /> log opposite the sample interval (Appendix B) . <br /> Following sample le collection, the ends of each brass liner <br /> p <br /> containing a soil sample to be submitted to the laboratory for <br /> chemical analysis were covered with TeflonTM tape, fitted with a <br /> polyethylene cap and labelled. The liner was then placed in a <br /> ' ZiplocTM bag and immediately placed in an insulated, ice-cooled <br /> chest. A Versar chain of custody record was completed for the <br /> samples and accompanied the samples until they were received by <br /> the laboratory. <br /> ' Selected soil samples were submitted for chemical analysis <br /> by a State of California, Department of Health Services (DHS) - <br /> certified analytical laboratory. Samples were only collected in <br /> the vadose zone as ground water was not encountered. <br /> 7 <br />