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Odor: If the soil smells like petroleum it might be remarked that it has a "petroleum like" or "solvent <br />like" odor. The use of terms like "strong" or "slight" should be avoided because there is no way to <br />ensure that these terms can be applied uniformly in the field between various persons performing <br />the logging (i.e., each person's olfactory sense is different). The use of terms like "chemical odor" <br />should also be avoided as there is no common reference point. Notations regarding the type of <br />petroleum distillate present (e.g., "diesel-like odor" or "gasoline odor") are inappropriate as these <br />are determination s that can only be accurately made by laboratory analysis. <br />B.5 References <br />Standard Practice for Description and Identification of Soils (Visual-Manual Procedure). <br />ASTM D-2488-90. <br />Compton, R. R. 1962. Manual of Field Geology. New York: John Wiley & Sons, Inc. <br />U.S. Department of the Interior. 1989. Earth Manual. Washington, D.C.: Water and Power <br />Resources Service. <br />"Grain Size Scale Used by Engineers", ASTM D422-63 and D643-78. <br />Additional Soil and Groundwater Sample Work Plan, Page 7 <br />BNSF Mormon Yard, Stockton, California <br />ttfwybnsf2tbnsfwptwp12018 t 1899020 00_mormon_yardtwork_plan_dappb_sogboreholelogging acpt chng_wp doc