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Site Characterization- Second Event Page 5 <br /> Former Karlson Trucking Facility <br /> Project No. 191.2 <br /> April 27, 2000 <br /> Select samples collected from each boring were submitted for analysis as <br /> follows: <br /> • Total Extractable Petroleum Hydrocarbons by EPA method 3540/8015(m), <br /> The detection limits for those analyses are listed on the attached data tables. <br /> 2.1.4 Geology & Soil Analytical Data <br /> A detailed log was made of each boring. The information noted included such <br /> data as sample depths, blow counts from hammer driven sampling devices, <br /> horizons of detectable contamination (detected by field methods), soil <br /> classification utilizing the Unified Soil Classification System and sediment <br /> description (color, texture, composition, hardness, moisture content, and post- <br /> depositional changes that have occurred in the sediments). An organic vapor <br /> meter (OVM) was used to screen samples for the presence of organic vapor in <br /> the Geo-Probe soil borings. <br /> The soils at the site generally consist of clean, medium- to very coarse- <br /> grained sands. Silt layers were noted below the 15 foot interval in SB-8 & 9 <br /> and at the 25 foot interval in SB-10. Hydrocarbon odors were noted in <br /> borings SB-9 & 10 and MW-7. The boring logs for borings SB-8,9,10,11 & 12 <br /> and MW-6 & 7 are attached as Appendix C. <br /> The soils at the site may be characterized as follows: <br /> 5 foot interval <br /> The uppermost soil sampling interval consisted of a mix of fair to poorly <br /> sorted silty sands. This soil was generally reddish brown to weak red in <br /> color. In some cases, larger (1-2 mm) clasts were noted. No measurable <br /> OVM readings were noted from this interval in any of the borings. <br /> 10-15 foot intervals <br /> Soils from this interval generally can be characterized by medium- to coarse <br /> grained sands, well graded or fine grained, well sorted sand. In borings SB-8, <br /> a minor silt layer was also visible at the 15 foot interval. The soils at this <br /> interval were generally brown/reddish brown to reddish grey with the <br /> exception of soils from SB-10 & MW-7 which were grey to pinkish grey. <br /> Slight hydrocarbon odors were noted in this interval in SB-9 at 10 feet, SB-10 <br /> at 10 and 15 feet, and MW-7 at 15'. OVM readings above 0 were recorded in <br /> the 10 and 15 foot intervals from SB-10 as well (8 and 4 ppmv, respectively). <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, Ca 95356 Fax: (209)569-0295 <br />