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Phase IIA Environmentai site Assessment Page 5 Former Karlson Trucking Property Project No. 191.2 October 28, 1998 3.0 FIELD & ANALYTICAL DATA 3.1 Site Geology and Hydrology Site Geology Observed During Investigation The shallow soils encountered during the investigation can be characterized generally as native (undisturbed) sands and silts and in some cases possibly sandy fill. The following is an interpretation of the soils observed during the investigation. Copies of the boring logs are included in Appendix B. Shallow Soil Sampling-Stockpile Twenty shallow soil samples were completed to approximately three feet below the surface of the soil stockpile. The soil encountered included loose dry sand and unconsolidated gravel and drain rock. No field evidence of hydrocarbon staining was visible in any of the soil encountered in the borings. Shallow Soil Sampling-Pole Barn Ten shallow soil borings were completed to a depth of six feet below ground surface through the dirt floor of the pole barn. Soil encountered in each of the borings consisted packed sandy surface material from a depth of about 0-0.5 feet ' below grade. The remainder of the material consisted of fair to poorly graded brown sands. A minor silt layer was encountered at a depth of about 5.5 feet in PB-9. Hydrocarbon surface staining was evident in the shallow soil in all of the borings (0-1' below ground surface). Additionally, faint hydrocarbon odor was noted at 2-3' in boring PB-3. No odor or staining was evident in soils at depths greater than T below ground surface in any of the borings. Hand Auger Soil Boring-Oil Sump One hand augered soil boring was completed adjacent to the oil sump at the Property. Soil encountered in this boring included a reddish sand from 0.5-5.5' in this boring from about 5.5' to 8 feet below grade, the soil consisted of a loose gravel/baserock material. This was interpreted as being non-native. Beneath this from about 8' to 10' below ground surface a light grayish brown sand was intersected. Groundwater was intersected at about 9.5 feet in this boring. No hydrocarbon odor or staining was noted in any of the soils intersected by this boring. Geo-Probe Soil Borings Seven shallow Geo-Probe soil borings were advanced to a total depth of 16 feet below ground surface. Samples were collected at the 4-6', 9-11' and 14-16' interval in each of these borings. Sediments encountered included reddish 2937 VenemanAve.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295