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DocuSign Envelope ID: FC9986C3-F179-4A3D-BACO-D8CA9F8B93A7 <br /> Proposal for Additional Remedial Investigation <br /> ANEW Hillsborough Dump <br /> ID No. NONCD0000483 <br /> Vow Task Orders 483DP-19 thru 25 <br /> S&ME Project No.4305-17-061G <br /> Impacted materials, not used as fill,will be drummed. Drums containing IDW will be sealed and labeled and <br /> placed on a wooden pallet within a self-standing temporary chain-link fence near the borings. Three corners of <br /> the fence will be secured with hardware.The fourth corner will be secured with chain and a padlock to allow <br /> controlled access to the fenced area. <br /> If needed, up to four composite samples of drummed/stored IDW will be collected for laboratory analysis and <br /> characterization. See the attached laboratory fees spreadsheet for the proposed laboratory analyses. If it is <br /> determined that the drummed IDW does not require off-site disposal, the IDW will be spread within the waste <br /> disposal area. If sampling results indicate the IDW is hazardous, S&ME will subcontract a waste hauler to dispose <br /> the drums off-site within 90 days after field activities are concluded. Fencing and pallets will also be removed <br /> from the site. The cost for off-site disposal of IDW is not included in this work plan/cost estimate. If off-site <br /> disposal of the IDW is required, S&ME will prepare a proposal for subcontracted services to dispose of the drums <br /> and submit it to the Unit for review and approval. <br /> Task 483DP-24 Risk Calculation <br /> All investigation generated data from various media (e.g., soil, groundwater, soil gas, surface water, sediment)will <br /> be tabulated with exceedances of standards highlighted.A comprehensive site-wide risk assessment will be <br /> conducted using NCDEQ's Risk Calculator.An evaluation will be presented for each pathway based upon the Risk <br /> Calculator output.The newest version of the Risk Calculator from NCDEQ's web site will be used. Risk Calculator <br /> usage procedures will be in accordance with the NCDEQ Risk Calculator User Guide(February 2021). <br /> Task 483DP-25 Letter Report Compilation <br /> S&ME will compile a letter report titled Remedial Investigation—Additional Groundwater, Landfill Gas, Surface <br /> Water and Sediment, Potable Well, and Groundwater Characterization that includes the findings of the items listed <br /> above for the scope of services. The following sections and information will be included in the report: <br /> Explanation of services performed and the findings. <br /> A section concerning variations from the work plan or the SOPS. <br /> GPS coordinates of sample locations. <br /> Surveyed locations of new monitor wells. <br /> Tables summarizing laboratory data compared to regulatory standards. <br /> Figures presenting sample locations and selected analytical results. <br /> Risk Calculator Results. <br /> Copies of original field notes. <br /> A digital copy(.pdf) of the report will be submitted as required. <br /> Subtask A Groundwater Sampling <br /> S&ME will return to the site approximately one month following the previous groundwater sampling event(Task <br /> 483DP-16, Subtask A) and sample groundwater at MW-4, MW-6,and MW-7,as described above. <br /> March 10, 2022 9 <br />