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~ 0 EXHIBIT A- SCOPE OF SERVICES ADDTTIONAL SUBSURFACE INVESTIGATION, AREA 8 COURTHOUSESQUARE SALEM, OREGON INTRODUCTION Century West Engineering Corporation (Century West) has prepared the following scope of services for additional subsurface investigation in Area 8, Courthouse Square block, Salem, Oregon. The objectives of the investigation are to: 1) delineate the extent of petroleum hydrocarbon contaminated left in-place in the azea north of Area 8 and 2) deternune if the petroleum hydrocarbon contaminated soil left in-place contains constituents of petroleum at concentrations which exceed the Oregon Department of Environmental Quality's (DEQ's) Risk-Based Cleanup Action (RBCA) Tier I Lookup Tables. ' SCOPE OF SERVICES Task 1 Work Plan and Health and Safety Plan Century West will prepare a work plan detailing the specific activities necessary to complete the above identified objectives. The plan will guide in identifying boring locations, field sampling activities, and sample analysis. A health and safety plan will be developed for use in field activities to be performed at the subject property. The purpose of this health and safety plan is to provide guidelines and standard operating procedures necessary to promote health and safety of on-site workers. Task 2 Subsurface Investigation Century West proposes the completion of investigative borings and collection of soil samples to further characterize the subsurface in the area north of Area 8. A driller licensed with the State of Oregon will use a hollow stem auger drill rig to complete a minimum of four investigative borings in the locations shown on Figure i. Prior to drilling, a traffic control plan and utility locate will be completed for the proposed area of investigation. One of the investigative borings will be located within approximately ten feet of the sample location for soil sample 8-4-15 .0', which contained diesel- range petroleum hydrocarbons at a concentration of 7,210 milligrams per kilogram (mg/kg). Refer to Century West's Pre-Construction Remedial Activities Report dated April 14, 1998 for additional details on soil sample 8-4-15.0'. The other three investigative borings will be located north of the former Area 8 excavation on Chemeketa Street (Figure 1). Based on field observations, up to two additional borings may be completed to delineate the extent of petroleum hydrocarbon contamination. During drilling, soil samples will be collected continuously using a sample barrel to a depth of approximately 20 feet. The samples will be inspected in the field and classified by soil type. A photoionization detector (PID) will be used in the field to screen the soil for volatiles. Field