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Mr Knoll ' February 19, 1999 Page 3 DRILLING AND SOIL SAMPLING On December 21, 1998, two soil borings(BFS-1 and BFS-2) were drilled using a hollow stem auger drilling ng, under the supervision of a QST geologist, to a depth of 20 and 28 feet bgs, respectively The drilling was continued an additional two feet in each boring, using a direct push method to conduct groundwater sampling The boring locations are shown on Figure 2 During drilling, soil samples were collected at 5-foot intervals I for geologic description and organic vapor monitoring Soil samples were collected in brass sleeves and retained for chemical analysis Typical drilling, soil sampling and organic vapor monitoring procedures and equipment are described in Appendix A A 3a inch slotted PVC pipe was covered in well sock, to filter the silty fines and placed in the borehole for groundwater sampling purposes The well sock was used due to the presence of sandy fine material Groundwater was sampled using a microbader in each of the temporary wells No odor was detected during ' groundwater sampling Groundwater samples were labeled and placed in appropriate laboratory containers, and chain of custody documents completed ' Soil cuttings from the drilling were placed in 55-gallon DOT drums, labeled and remain at the site pending laboratory analysis results The cuttings will be transported to a disposal facility for incineration Documentation will be provide upon completion of tins activity 10 LABORATORY ANALYSIS The soil and groundwater samples were delivered under proper chain-of-custody procedures to Kiff Analytical Inc , a state-certified laboratory located in Davis, California, for analysis Two soil samples were selected by Mr Knoll of the SICPHS-EHD for analysis based on vapor readings and location of the sample with respect to groundwater (within the capillary zone) Mr Knoll requested that soil and groundwater samples be analyzed for petroleum hydrocarbons, constituents, and oxygenates included the following Total Petroleum Hydrocarbons as gasoline(EPA Method 8015-modified) ' Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX) (EPA Method 8020) Seven Oxygenates-Ternary Butyl Ether (ETBE), Methyl Tertiary Butyl Ether (MTBE), Di-isopropyl ether (D1PE), Ethyl Tertiary Butyl Ether (ETRE) and Tertiary Amyl Methyl Ether (TAME), Tert butanol, Methanol, and Ethanol (EPA Method 8260) ' One soil sample was selected for analysis by the following protocols for possible future use in a health risk assessment Total Organic Carbon using method ASTM 02716 Porosity by Phase Relationships Hydraulic conductivity 1 SITE ASSESSMENT FINDINGS Moist to wet silty sand was found un Boring BFS-1 from 25 5 to 28 feet bgs Groundwater was encountered in the sand unit and soil sampling was terminated at 28 feet bgs In Boring BFS-2, groundwater was ' encountered in the silty sand wit and soil sampling terminated at 20 feet bgs The soil types observed at the