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Subsurface Results <br /> Byron Road Trenching Alignment, Tracy California <br /> and vapor. Worker exposure could be reduced by using a trench liner or trench <br /> box in the work zone, or by completing work above grade or limiting trench entry. <br /> Vapors from the heavy hydrocarbons can be strong and noxious. Mitigation <br /> measures include good ventilation in the trench, use of personal protection gear <br /> (respirators), and use of water or foaming agents to reduce odors from the <br /> exposed soil and ground water. Vapor monitoring using the PID could help <br /> determine whether to implement vapor suppression measures. <br /> Workers for the trench project should have appropriate training for encountering <br /> regulated compounds, such as Hazwoper occasional site worker training. <br /> 4.4 Trench spoils will be impacted with hydrocarbons and should be handled as <br /> regulated wastes. Ground water, if encountered, should be considered impacted <br /> and managed as a regulated waste. Exposure to these wastes should be limited <br /> by encapsulating stockpiles in visqueen, and storing ground water in a Baker tank <br /> or similar. <br /> ECM is available to review and discuss these results with PG&E staff at your <br /> convenience. Thank you for the opportunity to provide services for this project. Please <br /> call if you have any questions. <br /> Sincerely <br /> ECM roup <br /> Chris J. Brame yteka' wicz r <br /> Project Engineer Project Manager �V <br /> Attachments: Appendix A: Figures & Permit <br /> Appendix B: Boring Logs <br /> Appendix C: Analytic Reports <br /> cc: Michael Infurna, San Joaquin County <br /> C2:03-400\sbsf crpt.11.ry 1.mr03 <br /> Page 4 of 4 <br />