work plan for soil remediation, sampling and analysis plan, site ...

OHM RemediationServices Corp. WORK PLANcontaminated or uncontaminated stockpile. The method and frequency of rapid immuno assaytesting is described in the SAP.The excavation process will continue until the predetermined limits are encountered in alldirections or until groundwater is encountered. No excavation wilI be performed into thegroundwater table. If visual and/or field screening indicate that contaminated soil is presentbeyond the predetermined areas, OHM will consult the NTR for guidance. OHM will notexcavate any soil beyond those shown in Drawings C-2 and C-3 of the specifications withoutwritten authorization from the NTR.The results of the immuno assay testing wiIl direct the excavation activities. Samples will betaken of the walls of the excavations in accordance with the SAP. All methods frequencies,documentation and tests for the confirmation screening of the walls are described in the SAP.Should the screening results indicate soils are below the TPH action levels, confirmationsamples will be collected for off-site analyses as described in the SAP. If the indicated soilsare above the TPH action limits, then excavation will continue as authorized by the NTR.Because the removal of contaminated soil may create an excavation greater than 4 feet deep, theslopes of the excavation will be observed for stability and fulfillment of OSHA regulations.They will sloped to an angle of no less than 1.5 horizontal:1 vertical preventing the need forbracing and shoring.6.2 TRANSPORT TO STOCKPILE AND STOCKPILINGAll trucks used for transporting contaminated soil and uncontaminated soil within the exclusionzone will be decontaminated before leaving the exclusion zone. The loaded trucks willtransport all soil to the stockpile area along the route shown in Figure 2 and Drawing C-2 ofthe design drawings. The entire route is paved and the drivers will be instructed not to deviatefrom the haul route preventing the accidental spreading of contaminated soil. Should dustbecome a concern, the route will be dampened with water or deposits will be brushed orshoveled from the route. The trucks will deposit their loads of soil in the stockpiles asinstructed by the technicians who performed the petroleum hydrocarbon screening. Tominimize cross-contamination, the trackhoe will attempt to handle only contaminated oruncontaminated soil for extended periods of operation. Also, if it becomes necessary truckscan be dedicated to hauling just one type of payload.The stockpile area shown on Figure 2 and Drawing C-2 of the design drawings is a paved areawhich will be covered with polyethylene to prevent contact with clean pavement and easeremoval when loading for disposal or treatment. The stockpiles will be clearly labeled withsigns and flagging. Contaminated soil areas will be flagged with red tape and uncontaminatedsoil areas will be flagged with yellow tape. Both contaminated and uncontaminated soilOHM Project 16487WP work Plan May 199sIafommion herein is proprietary and confidential and to be used or nkased to others only with explicit written permission of OHM Remcdiation Sew&sCOIQ.6-2