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q1- <br /> u_ <br /> F" <br /> D.B.S. - Stockton Plating Inc. <br /> [ .� October 10, 1991 <br /> ;�- Pape -10- - <br /> thickness of the stained layer (approx. 25 feet) probably <br /> I <br /> indicates a fluctuating groundwater table (See Stained Soil <br /> to Profile, Appendix A, Figures 6 and 7) . <br /> 5.2 options <br /> r� There are several options or combinations of options that <br /> F� <br /> can be pursued at this point in the investigation. These <br /> include: (1) drill additional soil Borings, (2) install a vapor <br /> extraction system, (3) excavate the contaminated soil, and (4) <br /> perforin a groundwater investigation. Each option will be <br /> ,.. outlined and some of the benefits and/or disadvantages will be <br /> �* discussed. <br /> option 1 <br /> Y # � ; install 2 additional soil boxings at the site to investigate <br /> r the horizontal. and vertical limits of the gasoline contamination <br /> :? around soil borings 5B2 and SB3 in an effort to attain a zero <br /> detection line. The disadvantage of this option is the general <br /> lack of space requited for adequate investigation of the site. <br /> Due to the proximity of the buildings and overhead utilities, <br /> $ additional borings would be very difficult to install. <br /> Option ?.. <br /> --- - -- Install a vapor extraction system to xemediafe the gasoline <br /> contaminated soil associated with tank site TK1-90. The system <br /> izvolves. a number of vapor extraction wells placed around the <br /> } ' CONDOR <br />