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' B-2 5.1 Geombe Ground Water_Sarnpling Grab samples of ground water were recovered from each Geoprobe borehole using a peristaltic pump and ' tygon tubing which was inserted through the hollow Geoprobe rods The ground water samples were sealed in appropriate containers and stored in an ice chest cooled to approximately 4 degrees centigrade ' with crushed ice Upon completion of ground water sampling each borehole was sealed with a neat cement slurry mixed in a ratio of 5 gallons of water to each. 94 pound bag of cement, and emplaced with a tremie pipe 5.2 Abandonment of Geoprobe Borings Each Geoprobe sod boring was backfilled using a cement grout slurry Soil borings were abandoned by grouting through a tremae pipe with a cement/bentonite grout slurry upon completion of driIlmg 6.0 SOIL CLASSIFICATION ' As the soil samples were obtained in the field, they were classified by the geologist in accordance with the Unified Soil Classification System (USCS) Representative portions of the samples were retained for ' further examination and for verification of the field classification Logs of the borings indicating the depth and identification of the various strata, the "N" value, and pertinent information regarding the method of manntannmg and advancing the borehole were made and are presented in Appendix E ' 6.1 Sail Sample Screening/Flame Ionization Detector Method After the soil sample ziplock bags were brought to ambient temperature, the headspace vapors of the soil ' sample in the bag was screened with a flame ionization detector (FID) The corner of the sample bag was opened and the FID probe immediately placed within the headspace The highest observed reading ' was recorded on the boring logs. ' 6.2 Disposal of Soil Soil generated during the field operations was stored on-site and covered with plastic sheeting pending laboratory analytical results Two "stockpile" soil samples were collected from the soil per approximately every 50 cubic yards Samples were collected by digging approximately two feet into the soil pile and ' colIecting a sample using a 2-inch diameter, 6-inch long brass tube and capping each end with teflon and plastic caps The soil samples were composited by the laboratory into one sample for each of the R.PT160 SIS 1