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Mr. Robert McClellon <br /> July 1, 2004 <br /> Page 4 of 5 <br /> results indicate the predominant metals of concern in burn ash are not readily soluble in water; <br /> therefore, not readily leachable into groundwater. However, burn ash can pose a risk if it becomes <br /> airborne and is inhaled, ingested, or in direct contact with the skin. Site workers will utilize dust <br /> control measures to minimize airborne dust. <br /> Landfill Gas Constituents <br /> Landfill gas is generated as a result of the waste breakdown at a landfill. Methane is the major <br /> component of gas generated during biodegradation of solid waste buried in landfills. It is an <br /> odorless and colorless gas. It does not chemically react with the body, but may cause asphyxiation <br /> by displacing the oxygen in the air. Methane monitoring conducted by CIWMB staff and their <br /> consultants did not detect appreciable methane gas. Staff workers will continue to use appropriate <br /> precautions when drilling in or near expected landfill areas, however, and may use a Multi-gas Leak <br /> Detector if methane gas is suspected during drilling. <br /> Unidentified Drums or Other Buried Debris <br /> Unidentified drums or other buried debris may be encountered on-site. If drums are encountered <br /> during drilling, the area will be cordoned off and the CIWMB and EHD officer will be notified. <br /> The area will be flagged and excluded from the work zone until the drum can be better <br /> characterized. If buried debris is encountered that inhibits vertical drilling, then the boring will be <br /> monitored for the presence of methane gas using a Matheson Multi-gas Leak Detector and for VOCs <br /> using a photoionization detector (PID) before relocating the rig and beginning a new boring several <br /> feet away. <br /> If any suspicious odors or other materials are identified by site workers, Ground Zero will conduct <br /> air monitoring in the work zone and downhole using a PID. <br /> Physical Hazards <br /> There are numerous potential physical hazards associated with this project which, if not identified <br /> and addressed, could present operational problems as well as accidents and personal injury to the <br /> work force. In order to minimize physical hazards, standard safety protocols have been developed <br /> and will be followed at all times. <br /> Tripping, Slipping, and Falling Hazards <br /> Site personnel will be reminded to maintain sure footing on all surfaces. In order to minimize <br /> tripping hazards caused by debris,job supplies, and equipment, material will be removed daily from <br /> the work areas and stockpiled in their respective storage areas, if feasible. <br /> G:\GROUNDZE\Palomino\wp_borings.doc <br />