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Work Plan for Environmental Investigation May 18 , 1989 <br /> Proposed ARCO Station Woodbridge, California AGS 39044-1W <br /> efficiency and cost-effectiveness of the investigation. An <br /> automatic level is used to survey probe-hole locations relative <br /> •% to an arbitrary survey station and other facilities or features <br /> at the site. The probe holes will be backfilled with bentonite <br /> pellets to within a few inches of the ground surface and then <br /> topped off with material similar to the surrrounding surface. - <br /> Information from the vapor survey will be used to help locate <br /> wells that are recommended to evaluate the extent of <br /> contamination. The probe will provide information that will" <br /> allow these wells to be installed at optimal locations for cost- <br /> fr. effective delineation. 7 <br /> SOIL BORINGS AND SAMPLING <br /> Soil borings will be drilled using conventional hollow-stem auger <br /> drilling methods. Auger flights and sampling equipment will¢ be <br /> 4. steam-cleaned before use to minimize the possibility of <br /> contamination among borings. Drilling will be performed under <br /> the guidance of a field geologist, and the earth materials in the <br />�r borings will be logged as drilled. Borings used to construct.- <br /> 10 <br /> onstruct;10 <br /> Ajapl%901GeoSYSAMS <br />