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Mr. Becker (DTSC) and Lt. Vielhauer(DFG) <br /> Page 4 of 5 <br /> contamination we propose to excavate and dispose of the material. Subsequent to the initial <br /> removal action, we will collect confirmation soil samples and, if necessary, conduct a program of <br /> additional sampling designed to characterize the nature and extent of any residual contamination. <br /> Based on the results of the soil sampling additional remedial measures will be proposed as <br /> appropriate. <br /> ' Phase I—Initial Soil Removal <br /> ' OSHA Hazwoper-trained personnel will remove the contaminated surface soil from the <br /> impacted area. The dimensions of the proposed excavation are approximately 220 feet by 6-8 <br /> feet, encompassing the entire work area and extending to the location of sample 121E/3S on the <br /> east. Based upon the baseline soil analytical data, the depth of excavation will be approximately <br /> 3 inches. The volume of soil to be removed is estimated to be approximately 400 cubic feet or <br /> approximately 20 tons. A backhoe or bobcat loader will be used for the majority of the <br /> removal. Some manual removal is also anticipated. The excavation will be sprinkled with <br /> small amounts of water as necessary to control dust. To prevent any of the excavated soil from <br /> impacting the face of the levee, a silt barrier will be erected on the south side of the work area <br /> prior to soil removal. This excavation should have no impact on the levee bank and <br /> consequently a Department of Fish & Game Notification of Lake or Streambed Alteration <br /> ("Section 1603 Application") is not believed to be necessary. <br /> • Depending upon landfill acceptance requirements, the soil will either be directly loaded in a <br /> truck for immediate transport to the landfill or will be placed in a covered, 20-cubic yard <br /> capacity rolloff bin pending disposal. The bin will be labeled as hazardous waste and will be <br /> removed as soon as possible, but in no case more than 90 days from generation of the hazardous <br /> ' waste. <br /> • It is currently anticipated that the soil will be transported under hazardous waste manifest to <br /> ' Waste Management's Class I facility in Kettleman City for disposal. <br /> • Confirmation soil samples will be collected from at least seven locations from the floor of the <br /> ' excavated area. The samples will be submitted to GeoAnalytical for the analysis of total <br /> copper. <br /> • A technical report will be prepared and submitted to the interested agencies describing the <br /> results of the excavation and confirmation soil sampling. <br /> ' Phase II—Additional Soil Characterization and Final Remedy Evaluation <br /> ' Following the completion of the initial excavation and depending upon the confirmation sampling <br /> results, additional investigation may be necessary to characterize the nature and extent of any <br /> residual soil contamination. This information will be used to evaluate final remedial options and <br /> ' \`,GZA_FS\VOL_I\DATA\GROUNDZEAIARINA\REPORTS\Workplan.doc <br />