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

OHM RemediationServices Corp. SAMPLING AND ANALYSIS PLAN3.1.5 Field Screening of the Excavation WallsFollowing excavation of soils down to the seasonal high level of the surficial aquifer, grabsamples will be collected every 50 linear feet of each sidewall for field screening. The walls ofthe excavation will be sloped and will therefore be accessible for sampling within in the hole.The first few inches within the walls will be discarded prior to collecting each grab sampleusing a clean SS spoon and placing enough volume of material into a clean SS bowl or bucket.The sample must be thoroughly mixed to obtain a relatively homogeneous mixture prior toIilIing the appropriate sample containers as specified in Appendix A, Table A-l.Sampling equipment will be thoroughly cleaned between samples using decontaminationprocedures described in section 3.5. Field sampling personnel will wear disposable glovesduring sampling and will change gloves between sample locations to minimize the potential forcross-contamination.The sample will be screened using a TPH immunoassay field-screening kit. If TPH is lessthan 100 mg/kg, a confirmation sample will be collected for off-site analysis. If TPH isgreater than 100 mg&g, the NTR will be informed by the Project Manager to determine theadditional soil volumes to be excavated. Contaminated soils will be removed untilgroundwater level is reached.3.1.6 Confirmation Sampling of the Excavation WallsFollowing attainment of negative results on the immunoassay field screening tests,confirmation grab samples will be collected every 50 linear feet of each sidewall for off-siteanalysis of the parameters listed in Appendix A, Table A-l. The walls of the excavation willbe sloped and will be accessible for sampling within in the hole. The first few inches withinthe walls will be discarded prior to collecting each grab sample using a clean SS spoon andplacing enough volume of material into a clean SS bowl or bucket. The sample must bethoroughly mixed to obtain a relatively homogeneous mixture prior to filling the appropriatesample containers as specified in Appendix A, Table A- 1. For volatile samples, arepresentative grab sample will be placed directly into the sample container.Sampling equipment will be thoroughly cleaned between samples using decontaminationprocedures described in section 3.5. Field sampling personnel will wear disposable glovesduring sampling and will change gloves between sample locations to minimize the potential forcross-contamination.3.1.7 Confirmation Sampling of Area DSubsurface Soil InvestigationIn January, 1994, a former fuel oil UST located along the north side of Building G480 wasexcavated and removed. Available records indicate that an undetermined volume of fuelcontaminated soil was encountered and excavated along with the UST. No documentationOHM +jcct 16?87SAP Sampling and Analysis Plm May 1995h&f;~or’h~c hfrctn IS proprietary and confidential and to bc used or rclcascd to others only with explicit writtm permission of OHM RancdiationIp3-4