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Cleanup in Vulnerable Communities'Initiative Final Project Reference:Bobson Cleaners Discovery and Enforcement Discovery Project Number:60688620-5.1 Investigation Work Plan • Purged groundwater and excess groundwater collected for sample container filling, • Decontamination fluids, and • Soil cuttings. The USEPA's National Contingency Plan requires that management of investigation-derived wastes generated during such investigations comply with all applicable or relevant and appropriate requirements(ARARs)to the extent practicable. Listed below are the procedures that will be followed for handling the investigation-derived wastes.These procedures have enough flexibility to allow the site investigation team to use its professional judgment for the proper disposal method for each type of investigation-derived waste generated at each sampling location.Any waste storage containers such as 55-gallon drums will be sealed and labeled (including date)and placed in a secure area of the Site. • Unless there is contact with apparently contaminated material, used PPE and disposable equipment such as acetate liners can be double bagged and placed in a municipal refuse dumpster. These wastes are not considered hazardous due to the limited amount of site media that may adhere to this solid material and can be sent to any acceptable municipal landfill.Any PPE and disposable equipment that is to be disposed of that can still be reused will be rendered inoperable before disposal in the refuse dumpster. If field personnel are uncertain as to the level of contamination remaining on the PPE or solid material,this material will be contained in sealed 55-gallon drums for eventual disposal based on the results of sample analysis. The associated sample location and date that is the source of this apparently contaminated material will be indicated on the 55-gallon drum to aid in this determination. • Decontamination fluids anticipated to be generated during these sampling activities will consist of deionized water, residual contaminants, and water with non-phosphate detergent.The fluids will be poured into 55-gallon drums or portable storage tanks and labeled as"decontamination water." Purged groundwater will be poured into 55-gallon drums or portable storage tanks, labeled with the sample location and date, and sealed. • Soil cuttings will be placed into 55-gallon drums or bins that will be labeled with the source material sample locations(the soil borings or soil gas probe locations)and sealed. While soil from various borings may be placed in the same container, soil that is apparently contaminated will be sequestered, if possible, and identified by boring location and sample interval. Containers filled with PPE/solid waste, decontamination water, groundwater, and soil will be stored onsite in a secure location pending analytical results.After review of the analytical results, and any additional analyses required for waste handling and disposal,the containers will be transported offsite to an appropriate disposal facility. Prepared for: Department of Toxic Substances Control AECOM 22