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i S E C O R Ms. Devra Lewis April 15, 2004 Page 7 saw will be used only if the LEL are below 10% and OZ levels are less than 19.5% within the pipeline in the area that is being cut. If the LEL is above 10% and OZ is above 19.5%, carbon dioxide (CO2) will be used to inert the pipes and bring the LEL below 10% and 02 levels to below 19.5% prior to cutting. Any liquids encountered in the pipelines will not be allowed to come into contact with the ground surface and secondary containment will consist of plastic sheeting, absorbency pads, and a steel bucket placed between the pipeline and the ground surface. A vacuum truck will be on site in the event that large amounts of liquid remain in the pipelines. The three to five foot sections of pipes will be transported to a rinsing station where the pipe sections will be triple rinsed with a "hot Flash" rinse where hot steam and detergent (Liquinox, Simple Green, ect.) mix are injected into the pipe sections. The remaining pipelines will be rinsed in place by the method above or the use of a pipe cleaning "pig" if it is a straight run of pipe. Rinsate will be captured at the end of each pipeline with a vacuum truck using the secondary containment methods discussed above. The remaining pipelines will be"cold cut" and removed after they are properly rinsed. Rinsed sections of pipes will be staged for loading into a dump truck or roll-off bin for transportation to a steel recycling facility. The rinsing area and pipe staging areas will consist of a containment of hay bails around the perimeter of the area and double plastic sheeting on the hay bails and ground to prevent rinsate from contacting the ground surface. A depression in the ground of the rinsing area will be used to gather rinsate water which will then be pumped into a polyethylene storage tank. The pipe rinsing and pipe staging areas may be moved to different parts of the site depending on the locations of the excavations. All rinsate water will be stored in the polyethylene storage tank, sampled, and analyzed for the following: TPHd and TPHmo by EPA Method 8015M; TPHg and VOCs including fuel oxygenates by EPA Method 8260; SVOCs by EPA Method 8270; and total metals by EPA Method 6010. The rinsate will be profiled and transported to an appropriate disposal facility based on the profile. Pipeline Starting Point and Trend Locating Below West Weber Avenue and Parking Lot of Waterfront Towers. The trend of pipelines that continue under West Weber Avenue will be located using a tracer "snake" that emits a radio frequency that can be detected with a receiver at the surface. Additional methods of locating the trends of these pipelines may include the use of a metal detector and/or ground penetrating radar. Suspected pipeline termination points will be potholed with an air knife to expose the ends in the parking lot of the Water Front Towers. If the ends are not located during the initial excavation, a private utility locator will connect a radio transmitter onto the pipe, locate the trend of the pipe, and additional potholes will be performed to locate the ends of the piping. Potholes will be filled with clean imported soil and capped with cold patch asphalt. Pipeline Cleaning and Rinsing Below West Weber Avenue and Parking Lot of Water Front Towers. The pipelines will be will be triple rinsed with a "hot flash" rinse where hot steam and detergent (Liquinox, Simple Green, ect.) mix are injected into the beginning of the pipelines. A vacuum truck at the end of the pipelines will be used to evacuate the liquid from the pipelines. Liquids produced during the rinsing of the pipelines will not be allowed to come into contact with the ground surface and secondary containment will consist of plastic sheeting, absorbency pads, and a steel bucket placed between the pipeline and the ground surface. Pipeline Grouting Under West Weber Avenue and Water Front Towers Parking Lot. After the pipelines have been rinsed, rubber caps with hose clamps will be installed on the cut ends of the pipelines south of the sidewalk of West Weber Avenue. Excavations will be performed at the ends of the pipes in the Waterfront Towers parking lot. Cement grout will be pumped into each pipeline using a tremmie pipe that starts at the capped end of the pipeline. The excavations will be filled with hydrated bentonite chips extending approximately one foot above the top of the exposed pipes in order to seal the remaining pipe corridors. Excavations will be backfilled with clean imported soil and Stockton Parcel 2A:Work Plan for Pipeline Abandonment, Removal,and Soil Excavation and SVE Well Install