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LL y 1.[1NfEMO DS 1). Soil Sampling and Contamination Reduction Soil borings ari soil sampling were performed under the direction of a Delo engineer or geologist. The soil borings were advanced using a track-mounted hollow-stern auger drill rig. TO reduce the chances of cress-contamination between boreholes, all downhole drilling equipment was steamed-cleaned bea;een each boring. To reduce crass-ccomminatiaa between samples, the split-ba.-sel samuler wet washed in a soap solution and double-rinsed between each sampling event. Soil sampling was done in acc'ardance with ASTM 1586-84. Using this procedure, a 2-in-h -:!;.,side- diameter split-barrel sampler or a 2-inch inside-diameter California-type sampler is driven into the soil by a 140-pound weight falling 30 inches. After an initial set of 6 inches, the number of blows required to drive the sampler an additional 12 inches is Imown as penetration resistance, or the W value. 'phe N value is used as an empiri_,al measure of the relativa dens;ty c:cohesionless soils and the consistency of cohesive soils- Upon recovery,a portion of tle soil sample;vas placed in a glass jar and sealed for later saeenfng with a Photaioaimdon detector. Another portion of the soil sample was used for dasdfrcation and description. That part of the soil sample cotltcted in brass tubes within the Calitotaia-type sampler was stored at approximately 41C for transport to the laboratory. 1_2 Soil Classification As the samples were obtained in the field, they were classified by the crew chia geo'.ogist in accordance with the UnW,3d Soil CiassiEcation System (USC;). Reprr_tentative portiow; Of the samples were thy& ~ retained for further examination and for verifimticn of the Geld classification. Logs of each boring indicating the death and identification of the various strata, the K value, and perrnent iaforznatioa regarding the method of razintaining and advancing the borehole were made- 13 Soil So to Screenin Nu_Portabie Photatanization Detector iiethod After soil:ampler placed in plastic bags were brought to ambient temperature. the headspace vapors of the soil sample jars were screened with a portable phatoianization detecto,equipped with a 10.2 cV lamp calibrated to benzene. The sanple jar lid will be opened and the detector- probe immediately placed vithin the 'pace of the jar. The highest obser reading was then recorded.