ARCHIVED REPORTS XR0009744 - Laserfiche WebLink

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Interim Emergency Remed,al Action/Momtonng Well Installation Work Plan Page 5 Former Union Facility,-Cutter Lumber Project No 102 2 May 20, 1997 The extent of the excavation will be partially determined by the field screening and soil ' sample analysis Additional criteria will also be used to maximize the cost benefit of the remedial excavation, such as • Concentration of hydrocarbon contamination The "rule of thumb" cut off for the ' emergency source reduction excavation proposed here will be roughly 2,000 ppm as estimated using a PID device • The amount of uncontaminated overburden needed to be removed to remove additional contaminated soil If greater than 20 feet of overburden material needs to be removed to remove additional contaminated soil, then the excavation will not be continued in that direction • Site specific access restrictions Buildings may restrict access to further excavation The are no plans to pump groundwater from the open excavation although if a thick pad tof free product is encountered it may be removed ' 2.12 Excavation Sampling During the completion of the excavation, soil samples will be collected from spoils removed from the excavator bucket A field screening procedure will be used to select samples which will be both representative of conditions within the pit and useful in determining the feasibility of additional excavation in the area sampled Field ' observation methods (i a sediment type, color, texture, moisture and visible evidence of contamination such as staining and odor) will be used to held identify potentially contaminated soil A PID meter using a 10 0 eV lamp may also be used to detect the ' presence of organic vapors above background levels 2.1.3 Excavation Back-Fill ' After the highly impacted soil is removed, the pit will be back-filled torade with clean, , native material, and this material compacted in lifts to ground surface Due to the clayey ' nature of the soil removed from the pit, it is proposed that the clean overburden material be disposed of as grading material elsewhere on the site or disposed of off site as non- hazardous Class III waste ' 2.1 .4 Disposition of Contaminated Soil/Groundwater ' Upon removal of contaminated soil, the soil will either be stockpiled on site, on and covered with plastic sheeting for bio-remediation or hauled to Forward landfill in Manteca (Class 11 Landfill) Groundwater/Free product will be pumped directly by a hazardous waste hauler and removed to an appropriate recycling facility 2937 Veneinan Ave, #B240 Geo-Please Environmental Inc Phone(209)569-0293 Modesto, CA 95356 Fax(209)569-0295