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• Mr.M. Scott Mansholt—CEMC Site Investigation Work Plan March 29,2006 Banta Road—UPRR Page 4 of 5 All subcontractors must review and adhere to the HASP and JMP prior to performing any work on site. To ensure that a high level of safety consciousness is maintained, CEMC has implemented a behavior-based safety program through which daily on-site safety audits are conducted in the field. While marking proposed boring locations,potential safety concerns and obstacles to the proposed scope of work will be observed and noted. These include overhead lines,marked and unmarked underground lines,pedestrians,and automobile traffic. Underground Service Alert(USA)will be notified of all proposed boring locations at least 48 hours prior to any intrusive field activities. All USA ticket alerts will be confirmed and cleared prior to any intrusive field activities. In addition, SAIC will subcontract a private utility locator to clear the proposed boring locations for underground utilities. All fieldwork will be conducted in accordance with SAIC's standard procedures. SOIL BORINGS To accomplish the objective of the investigation,four soil borings and two contingency borings are proposed at the locations shown on Figure 2. The borings will be advanced using a direct- push drill rig to approximately 30 feet bgs. Soil samples will be collected at approximately 5, 10, 15,20, 25,and 30 feet bgs. In addition,soil samples will be collected at the capillary fringe,at obvious changes in the lithology, and at apparent petroleum-hydrocarbon impacts. If obvious petroleum-impacted soil is observed during drilling activity,an alternate boring location(as proposed on Figure 2)may be used. In addition to the pre-fieldwork safety precautions, all borings will be cleared by either hand auger or an air knife to 8 feet bgs prior to the use of drilling equipment. All borings will be logged using the Unified Soil Classification System under the supervision of a California Professional Geologist. A photoionization detector(PID)will be used to collect organic vapor readings from the soil-sample cores. PID readings of soil cores will be recorded on the boring logs. Between borings, down-hole equipment will be cleaned using a LiquinoxTM/water solution to reduce the possibility of cross contamination. All samples will be labeled,sealed in a plastic bag, and placed immediately in an ice-cooled container for delivery to CEMC's preferred California State-certified laboratory under SAIC chain-of-custody protocol. Upon completion of soil sampling activities,the soil borings will be abandoned according to SJCEHD guidelines. The geospatial location of the borings will be surveyed using a Trimble®GPS system. INVESTIGATION-DERIVED WASTE(IDW) SAIC will conduct this investigation using a direct-push drill rig,which produces minimal IDW. IDW generated during this investigation will be placed in an approved container, labeled, and properly stored on site pending disposal by CEMC. A composite soil sample of any IDW will be collected and submitted to the laboratory under SAIC chain-of-custody protocol for waste profiling. PROPOSED ANALYSES SOIL SAMPLE ANALYSES Based on PID,visual,or other observations, soil samples will be selected and analyzed for the petroleum-hydrocarbon constituents listed below. All remaining soil samples collected will be placed on hold with the analytical laboratory.