CORRESPONDENCE_2008 (7/08 TO 12/08)

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mom M_1a11110MI]BUM-11"JA AaWT `l 3.1 WORK SITE SAFETY The work includes excavation of refuse or contact with refuse. Potential hazards due to the presence of buried refuse include those associated with LFG and refuse itself. Also, the work is in the vicinity of an oil pipeline, the location of which will be clearly marked prior to any drilling and trench excavation across the access road (Figure 1). SWD has notified Shell Oil regarding this project. A. Landfill Gas When buried in a landfill, refuse and other organic material produces LFG, which is approximately 50 percent methane by volume and may contain other contaminants. Potential hazards associated with LFG are due to: 1. Oxygen deficiency 2. Combustible characteristics of LFG 3. Potential for hydrogen sulfide in LFG Potential hazards include: 1. Fire 2. Explosion 3. Asphyxiation LFG may also contain trace concentrations of organic compounds. Dilution of LFG in air to below the OSHA safety limits of 0.5 percent methane (10 percent of the Lower Explosive Limit) usually reduces the concentration of trace components to below detection limits. LFG can move through soils, especially through sandy layers that exist at the site. Movement through soils can remove the odorous compounds of LFG, such that the LFG can be detected only with the proper test equipment. B. Refuse Refuse will be excavated in this work. The landfill contains household refuse, demolition debris, tree trimmings, and miscellaneous refuse. To the best knowledge of SWD, hazardous materials have not been disposed at the site. However, the landfill was operated by others when this refuse was disposed. Potential hazards associated with the direct contact with refuse include: Work Plan — LFG Extraction Well Installation San Joaquin County Corral Hollow Sanitary Landfill Public Works Department 10-2-08 4 . Solid Waste Division