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Campbell Taggart Inc. December 14, 1990 <br /> 202/029000-390 Page 5 <br /> Remedial work plan preparation and permitting. <br /> Excavation of impacted soils by subcontractor including verification of the <br /> lateral and vertical extent of impacted soils using an on-site mobile <br /> analytical laboratory. Entire operation will take approximately three days <br /> and will be supervised by on-site field geologist. <br /> Phase II will consist of the remediation of the impacted soil as assessed in Phase One. The <br /> following summarizes the work steps anticipated for the soil remediation phase of work. <br /> Initial, interim, and closure soil sampling rounds to verify contaminant <br /> concentrations,degradation rates,and hydrocarbon levels in the soil plies. <br /> Metals such as cadmium, chromium, lead, and zinc are commonly <br /> associated with used motor-oil and will be tested for. In the unlikely event <br /> that constituents are detected at levels that could prove harmful to the <br /> bioremediation process, or that naturally occurring hydrocarbon utilizing <br /> bacteria are not present in the soils, then an appropriate treatment <br /> alternative will be addressed. <br /> Microbial analysis of soil samples to determine optimum hydrocarbon <br /> utilization of naturally occurring bacteria. <br /> Design and construction of soil treatment cells along with associated <br /> piping and electrical hookups. <br /> Weekly site visits to perform system maintenance and monitoring. <br /> Closure report to regulatory agencies. <br /> Reclamation of the treated soil back to area of excavation (if approved by <br /> regulatory). <br /> Groundwater Technology will provide all engineering, design, labor, project management, <br /> subcontractors and equipment necessary to excavate and treat(using bioremediation)the motor-oil contami- <br /> nated soil. <br /> 6.0 SYSTEM CONSTRUCTION <br /> The combined controlled aeration/biodegradation process Is depicted on Figure 2,Aeration System <br /> Diagram. The soil treatment cell will be constructed by first placing a high-density,polyethylene (HDPE) liner <br /> on the ground surface. The finer will then be overlain with 2 feet of contaminated soil,which will be sprayed <br /> with a solution to provide nutrients for the microbial flora. Slotted pipes will be laid the length of the pile, <br /> with the capped ends two feet from the far end of the treatment cell. Two feet of additional contaminated <br /> i <br /> GROUNDWATER <br /> TECHNOLOGY,INC. <br />