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SAP/QAPP Addendum Lodi-125 N Stockton Final March 24,2025 8.0 DISPOSAL OF RESIDUAL MATERIALS In the process of collecting environmental samples at the Site,several different types of potentially contaminated investigation-derived waste (IDW)will be generated,including the following: • Personal protective equipment(PPE); • Disposable sampling equipment;and • Decontamination fluids. The EPA National Contingency Plan requires management of IDW generated during site investigations to comply with all relevant or appropriate requirements to the extent practicable.This SAP/QAPP Addendum will follow the Office of Emergency and Remedial Response Directive 9345.3-02 (EPA 1991),which provides guidance for managing IDW during site investigations.Listed below are the procedures that will be followed for handling IDW.In addition,other legal and practical considerations that may affect handling of IDW will be considered.The following procedure is flexible enough to allow the Site investigation team to use professional judgment as to the proper method for disposal of each type of IDW generated: • Used PPE and disposable sampling equipment will be double-bagged and placed in a municipal refuse dumpster.These wastes are not considered hazardous and can be sent to a municipal landfill. • Decontamination fluids generated during sampling activities may consist of deionized or distilled water,and water with non-phosphate detergent,all of which may contain residual contamination. The volume and concentration of the decontamination fluids are considered de minimis allowing for on-site disposal. • Excess soil from sampling locations potentially generated during sampling activities may contain residual contamination.The volume and concentration of the excess soil will be sufficiently low to allow for disposal at the sampling location. 58