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' Geologicaf?echnics Inc. • • Page 2 Fonzia Corporation Project No. 774.2 ' March 1, 1999 ' 2.0 PROPOSED INVESTIGATION To further investigate the extent of soil and groundwater impacted with diesel and motor oil ' petroleum hydrocarbons, Geological Technics Inc. proposes drilling several boreholes using GeoProbe direct push methods. The work proposed includes: 1. Former Storage Area • A minimum of four GeoProbe boreholes will be drilled around the former storage area to a depth of approximately 12 feet. t • Soil and groundwater samples will be collected from each borehole. 2. Warehouse Area • A minimum of four GeoProbe boreholes will be drilled around the outside of the warehouse to a depth of approximately 12 feet. • Soil and groundwater samples will be collected from each borehole. The plan refers to a minimum number of boreholes. However, if site conditions warrant (i.e., ' contamination is encountered in the soil or groundwater of a borehole), then it is proposed to drill additional boreholes to define the extent of contamination. For instance, if motor oil were discovered in the proposed location of GP-4, then an additional borehole would be ' drilled north. The number and location of additional boreholes would be determined in the field with consultation with the County Inspector. 2.1 Borehole Drilling & Soil Sample Collection The Site Map in Figure 2 shows the locations of the proposed boreholes. ' The borehole will be drilled with a GeoProbe rig owned and operated by V&W Drilling of Rio Vista, CA (C57# 720904). The GeoProbe advances a coring tool with a pneumatic hammer to a selected depth. Upon reaching that depth the coring tool is opened and ' advanced further to fill the core barrel. The soil sample enters an acetate cylinder contained in the coring tool. Upon filling, the coring tool is pulled from the hole and the cylinder is removed. The cylinder is then cut and the selected interval is preserved for laboratory analysis. The remainder is used for geologic logging. All soil samples will be sealed with ' Teflon, capped with plastic end caps, labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol. ' The GeoProbe borings will be advanced to approximately 12 feet bgs, the depth to groundwater during the drought of the early 1990's. Soil samples will be collected at three- foot intervals for geologic logging and laboratory analyses. 1 • 3 feet • 6 feet (expected depth of capillary fringe) • 9 feet • 12 feet Two to four soil samples from each borehole will be submitted to the laboratory for analysis. Since only selected samples will be submitted for laboratory analysis, a screening process ' will be used to gather additional information through field observation. This information will assist in determining which samples will be analyzed. All current capillary fringe samples (6 foot) and the historic capillary fringe samples (12 foot) will be tested. Evidence of elevated