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Project No. 034-17016 Site-Specific Health& Safety Plan Page No. 8 permit process, a workplan will be prepared and submitted to the SJCEHD for their review and approval. 4. Krazan will mark the proposed boring locations. The local underground utility alert service, USA North, will be contacted for marking of utilities. USA North marks to property boundaries as a matter of policy, and will not mark privately held property. Krazan will not be responsible for damage to equipment,personnel,utilities,or other property caused by encountering utilities that are not identified prior to subsurface exploration. 5. Site Safety protocol will be followed,including appropriate level of personal protection equipment. A proper exclusion zone will be maintained around each work area. 6. Krazan will implement industry standard methods and protocols for sample collection, sampling equipment decontamination,sample storage,transport, hold times,chain-of-custody, etc. 7. A limited geophysical survey (LGS)will be conducted using ground penetrating radar(GPR) and electromagnetic equipment to clear the proposed soil boring locations of subsurface utilities and/or structures. 8. Concrete coring will be completed where the soil borings must be drilled through concrete. 9. Soil borings will be advanced utilizing a truck-mounted drill rig using flighted auger, a truck- mounted and/or limited access Geoprobe rig equipped with direct push capabilities and/or hand auger equipment. 10. Soil boring logs will be completed in the field during drilling operations. The soils encountered will be continuously examined and visually classified in accordance with the Unified Soil Classification System. Evidence of contamination, if any, will be recorded on the soil boring log. 11. Field screening using a photoionization detector(PID)will be conducted to evaluate soil samples for the presence/absence of volatile COCs during sample collection and results will be recorded. 12. Soil and groundwater samples will be collected in laboratory-grade containers. Subsequent to sampling,the groundwater samples will be immediately placed in an iced chest. The samples will be labeled and identified on a chain of custody form and transferred to a State-approved analytical laboratory under chain-of-custody protocol. 13. COCs investigated during the course of this assessment and their respective analytical methods will include the following: • Total petroleum hydrocarbons—carbon chain(TPH-cc)by EPA Method 8015C; • TPH-diesel (TPH-d)by EPA Method 8015; • Volatile organic compounds(VOCs)including fuel oxygenates by EPA Method 8260B; • CAM 17 Metals by EPA Method 6010B/747IA; • Polychlorinated Biphenyls(PCBs)by EPA Method 8082; and • VOCs for soil vapor by EPA Method TO-15. 14. Soil vapor wells will be sampled using field procedures consistent with the Advisory—Active Soil Gas Investigations published in April 2012 by the DTSC and the Los Angeles and San Francisco Regional Water Quality Control Boards. 1,1-difluoroethane(DFA)will be used as the leak detection compound. 15. Soil cuttings or investigation derived waste(IDW)will be placed in drums with temporary storage on-site. One(1)composite soil sample of the IDW will be collected and submitted for laboratory analysis for TPH-cc, VOCs and CAM 17 metals. Krazan can assist in the disposal of the IDW, however,costs for handling and disposal of IDW are not included in this Revised Change Order No. 2R. KRAZAN&ASSOCIATES,INC. With Offices Serving the Western United States 034170/6 SSI Lathrop HASP FinalAm