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' Geo(ogica[Technics Inc. i Page 3 Soil Boring Installation Work Plan Fortifiber ' Project No. 709.2 December 7, 1998 ' 1. Paint (Ink) Shed — Located on the south end of the truck-loading ramp. The shed was anchored to the concrete slab. Deteriorated concrete was scrapped off, the rest of the slab was cleaned and then it was resurfaced. No soil samples were collected and tested from ' under the deteriorated area. 2. Tank Farm — It is not clear, but observations suggest that only the west ASTs secondary containment unit had the stained soil removed and disposed of as hazardous waste. Odor ' and visual observations were used to confirm the soil cleanup; no confirmation soil samples were taken. The ground surface was then covered with pea gravel. 3. Trash Compactor — (Area just west of the Waste Paper Bailers.) The stained asphalt and clay soil was removed and disposed of as hazardous waste. Soil cleanup inspection was performed by visual and odor observations; no confirmation soil samples were tested. The ground surface was covered with pea gravel. 4. Storage/Machinery Cleaning Area — Upon removal of the drums and other stored t materials, the stained soil was scrapped in a similar manner as at the three above locations. It was discovered, however, that the stained soil extended deeper. Additional soil was excavated to the depth of the groundwater interface (-12 feet). This ' contaminated material was disposed of as hazardous waste. Soil cleanup inspection was performed by visual and odor observations; no confirmation soil or groundwater samples were tested. The ground surface was covered with pea gravel. Conclusions ' • Even though the visible contaminated soil was removed, several types of chemicals that could be present do not leave an obvious stain, especially in the dark brown clay soils of Tracy. These chemicals could still be present in the soils of this Property. ' Recommendations • Soil samples should be tested in all four areas below the depth of soil removal by Universal. ' • A groundwater sample should be tested in the area of storage/machinery cleaning area. • These samples should be tested for petroleum products and hazardous chemicals (including solvents, volatile organic compounds, and metals). ' Figure 1 is a vicinity map and Figure 2 shows the locations of the concerns discussed above. Work Plan Submittal t Geological Technics Inc. (GTI) was contracted by Rehrig Pacific Co. to prepare the following work plan, obtain a boring permit and investigate these areas of concern. A boring permit application is attached. ' 2.0 PROPOSED INVESTIGATION It is proposed that a total of 12 soil borings be installed. Samples will be collected continuously for geological and chemical analytical evaluation as discussed below. Hand auger equipment will be decontaminated with an Alconox solution between boreholes. ' 2.1 Soil Boring Installation i The work proposed here addresses the potential environmental issues on this Property as ' identified above. The work is outlined as follows. The soil collection protocol is discussed in Section 2.2. 1