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` o <br /> GEOMATRIX <br /> density, and any other pertinent information, such as degree of induration, .calcareous <br /> content, presence of fossils and other distinctive materials. <br /> The original field logs will be sent or delivered to the Geomatrix office for review by the <br /> Registered Geologist or Engineer and the project manager and for storage in the project <br /> files. <br /> 4.0 GEOPHYSICAL LOGS <br /> Following completion of drilling, downhole geophysical logs may be performed <br /> immediately after the drilling fluid has been circulated to remove all of the cuttings. <br /> Geophysical methods and equipment will be selected to provide stratigraphic or <br /> hydrogeologic data appropriate for the project. Geophysical logging will be done as <br /> quickly and efficiently as possible, while the boring side wall is still in stable condition, to <br /> minimize the possibility of interference with the down-hole probes. Instruments on the <br /> logging unit will be adjusted to give the maximum definition of strata boundaries. All <br /> gg g J <br /> down-hole geophysical equipment will be cleaned before and after entering each borehole. <br /> 5.0 FIELD SCREENING <br /> Soil samples at the boring locations may be screened using a portable meter such as a <br /> photoionization detector (PID), a flame ionization detector (FID), or a lower explosion limit <br /> (LEL) meter, or other organic vapor meter. The meter may be used to assess the presence <br /> of VOCs or other gases in soil samples. Additional field screening techniques for chemical <br /> characterization of soils may include x-ray fluorescence (XRF) and thin layer <br /> chromatography.(TLC). Procedures for field screening are described in the protocol SOIL <br /> SAMPLING FOR CHEMICAL ANALYSIS. <br /> DRILLING AND DESTRUCTION OF SOIL BORINGS <br /> I <br /> MSMEOMATRX.PRO REVISION DATE: NOVEMBER 1992 Page 5 of 6 <br /> I <br />