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Geological Technics Inc. Page 2 Work Plan Proiect Name: Olsen (Vernalis) Project No. 248.2 January 3, 1995 housed a pumping station for the Chevron/Standard Oil product pipeline located near or along the northeastern margin of the site (parallel to highway 33 and the railroad). This Environmental Assessment is composed of a modified Phase I and a Phase IIA Environmental Site Assessment (ESA). The preliminary Phase I ESA is being conducted to evaluate potential nearby off-site areas of environmental concern as well as delineate areas of recognized environmental concern that may be present on property to help us determine locations for exploratory borehole installation. The purpose of this Phase IIA ESA is to evaluate the presence or absence of petroleum contamination from past land use. If petroleum hydrocarbons are present, the lateral and vertical extent of the contamination will not be investigated at this time. The initial scope of work is to drill four boreholes at a preselected location (to be determined upon completion of the Phase I ESA), to groundwater and collect/test selected soil samples. 2.0 PROPOSED INVESTIGATION 2.1 Soil Boring Installation Geological Technics Inc. proposes to install four soil borings (SB-1, 2, 3, & 4) in the area suggested by the records review to be the remains of the pumping station and relevant piping runs. Osterberg & Stewart Well Drilling will perform the soil borings (Lic.# 446670). The soil borings will be drilled using a 7.25 inch outside diameter continuous flight hollow stem auger to a total depth to be approximately 40 feet, and not to intercept the groundwater. Soil cuttings will be stockpiled on site and underlain and covered with 6 mil plastic sheeting. Soil samples will be collected for geological and analytical evaluation at five foot intervals. Soil samples will be collected in 6.0 inch brass liners using a 2.0 inch modified California split spoon sampler. All soil samples will be sealed with aluminum foil, capped, labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol. Because every soil sample collected will not be submitted for laboratory analysis, a screening process will be used to gather additional information through field observation noting sediment type, especially grain size and clay content; moisture content; visible evidence of contamination, i.e., color change due to reduction of iron or discoloration from hydrocarbons and other pollutants, and the readings above background on a organic vapor meter (OVM). The OVM is a field portable photo ionization detector that uses a 10.2