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1 � � 4.3 DATA EVALUATION/CONTINGENCY PLAN Confirmation sample results will be compared to the cleanup goals presented in Section 4.0. As a contingency, if a result exceeds the proposed cleanup goal,then the area(25 feet on either side of a "failing" sidewall sample for a total of 50 linear feet or 625 ft2 of bottom area centered around the sample) represented by the sample(s) exceeding the goal will be extended approximately 0.5 feet and retested in accordance with the sampling protocol defined above. 4.4 DISPOSAL OF EXCAVATED SO[L/TRANSPORTATION PLAN Soil excavation will result in an estimated 885 yd3 classified as RCRA hazardous waste (1,416 tons based on a 1.6 tons/yd3 conversion factor) and an estimated 490 yd3 (785 tons) classified as California hazardous waste for off-site disposal. It is anticipated that excavated soil will be characterized prior to excavation such that it may be loaded directly into trucks for off-site disposal. Direct loading will be at the discretion of the Contractor based on various factors including space limitations and truck availability. The Contractor will coordinate profiling and pre-acceptance of the excavated soil at the following proposed permitted off-site land disposal I facility: Clean Harbors 2500 West Lokern Road Buttonwillow, California 93206 Excavated soil will be loaded into trucks (such as end dump trucks or large dump trucks), using an excavator, backhoe, or front-end loader, covered with tarpaulins, and transported to Clean Harbors via surface streets and highways. Prior to leaving the Site, soil on the exteriors of the trucks will be removed and placed either into the current truck or back into the stockpile. The trucks will then proceed to a designated pad for decontamination. Prior to leaving the Site, the Contractor will inspect each vehicle to ensure proper loading, covering/sealing, decontamination, placarding (if required), and manifesting has been implemented. Prior to departure, trucks will be covered with tarps to prevent the release of dust or debris. The proposed truck routes are depicted on the Transportation Plan included in Appendix C. The vehicle driver is responsible for ensuring that materials are safely loaded and unloaded from the driver's vehicle. This responsibility will include, but is not limited to: ➢ Making certain that the loading and dumping conditions are safe ➢ Ensuring that each load is evenly distributed through the trailer ➢ Determining that the ground for loading and unloading is stable - do not unload on uneven or unstable ground ➢ Determining that the wind conditions and vehicle direction relative to the wind are appropriate—do not dump during heavy crosswinds ➢ Ensuring that there are no obstacles at the dump locations—do not dump when adjacent to another vehicle i +� PACIFIC EDGE ENGMEERMG 10 SREW_Manteca_draft.docx (949)470-1937;(949)470-0943(FAx)