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Nov 29 05 12:48P Peter Weiler (925) 938-1610 P.5 <br /> (e.g., site features, utilities, etc.) and final locations may be moved to the closest accessible <br /> location. <br /> As required by the Occupational Health and Safety Administration (OSHA) 29 CFR 1910.120, <br /> Hazardous Waste Operations and Emergency Responses, a site-specific Health and Safety Plan <br /> (HSP)will be prepared for use while conducting the proposed field activities. The HSP will be <br /> read and approved by the Project Manager, a Quality Assurance Reviewer, and the On-site <br /> Safety Officers of ERS and all subcontractors working at the Site. <br /> 2.2 TASK 2 --TRENCHING TO DELINEATE LANDFILL CELLS <br /> 2.2.1 Trenching to Delineate LandfflI Cell Boundaries <br /> Previous investigations have adequately defined many of the boundaries of the six landfill cells <br /> in the subject area. Boundaries currently without adequate delineation will be located using a <br /> backhoe or track-mounted excavator that will dig trenches and expose the lateral extent, or <br /> edge of,the landfill cell. Figure 8 depicts the nine proposed trench locations. <br /> The exploratory trenching method will begin outside of the suspected edge of the landfill cell. <br /> The trench will be dug to approximately 3 to 5 feet below ground surface (bgs) to ensure that <br /> buried cell contents will be exposed. Once the trench is at the appropriate depth, it will be <br /> extended towards the landfill cell and stopped when disposed wastes are encountered. Each <br /> currently undefined edge will be located in this manner. Cell corners will be confirmed by <br /> advancing two trenches offset by 90 degrees. <br /> 2.2.2 Grab Water Sampling and Analysis <br /> Water encountered within a trench at the base of the landfill cell will be collected using either a <br /> peristaltic pump of bailer. If water is present, at least one water sample will be collected from <br /> each landfill cell. Based on the prior analytical results, the water samples will be analyzed by a <br /> California certified laboratory for: <br /> ■ Total petroleum hydrocarbons as gasoline, diesel,and motor oil by EPA Method 8015 <br /> ■ Volatile organic compounds by EPA Method 8260 <br /> ■ Title 22 metals (dissolved)by EPA Methods in the 6000 series. <br /> November 2005 Page 2 Environmental Risk Services,Corporation <br />