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Sampling and Analysis Plan water rinse will follow the detergent washing. Specific decontamination procedures are described in SOP 5 (Appendix B). 3.3.5 Management of Investigation Derived Waste Investigation derived waste (IDW) consisting of soil cuttings from the borings and wastewater from equipment decontamination will be collected and analyzed prior to disposal. Soil cuttings from the borings and wastewater from equipment decontamination will be collected in United Nations approved 55-gallon drums, labeled as nonhazardous with contents and accumulation date clearly labeled and left on site until picked up and disposed of by a waste management subcontractor Soil boring sample analytical results will be used to profile waste for disposal. If additional analysis is necessary, samples will be collected from the IDW and submitted to a California certified laboratory for analysis in accordance with disposal facility requirements. Upon completion of waste characterization, the waste management subcontractor will transport the drummed waste to the appropriate disposal facility. 3.4 Quality Control 3.4.1 Sample Identification Samples will be identified by a unique alphanumeric code (sample ID) which will be written on the sample label and recorded on the chain of-custody form in accordance with SOP 3 (Appendix B). The sample ID will include the Subject Property number(01, 02, 03, etc.), followed by the boring number (131, B2, B3, etc.) followed by the media sampled ("SO" for soil and "GW" for groundwater), followed by the depth interval sampled in feet below ground surface. For example, a soil sample collected from Subject Property 2 at a depth interval of 3 to 4 feet will be labeled as: • 02-13 1-SO-3-4 A groundwater sample collected from Subject Property 16 at a depth of 25 feet will be labeled as: 16-B1-GW-25 IDW samples will include the medium (S for soil and W for water) and the sample sequence (IDW- Sxx or IDW-Wxx). The ID for trip blanks and rinsate blanks will consist of the prefix TB or RB and the sample sequence (TBx or RBx), respectively. 3.4.2 Quality Control Samples Trip blank and equipment blank samples will be collected for quality assurance and quality control (QA/QC). The quality control samples will be analyzed at the frequencies shown below: • Trip blank: one for each shipping cooler containing soil or groundwater samples for VOC analysis, and • Equipment/rinse bank: one per day for reusable soil or groundwater sampling equipment. Additionally, the California certified laboratory will follow appropriate laboratory QA/QC procedures as dictated by the U.S. Environmental Protection Agency (EPA) method and the laboratory's SOPS. June 26,2023 1 8