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MQuality Assurance/Quality Control Plan Martin Metals Finishing Inc. (Former) Stockton, California 4.1.8 Equipment Decontamination Any reusable sampling equipment will be cleaned between samples in accordance with CDIM SOP 5.0, Equipment Decontamination (Appendix C-1). 4.9.9 Quality Control Samples Field quality control (QC) samples will include duplicate samples, which will be collected at a rate of one duplicate per 20 samples. Field duplicate samples are two samples collected at the same time, from the same source at the same depth and sample location as the associated field sample. Field duplicates will be submitted to the analytical laboratory as separate, "blind" samples. Duplicate sample nomenclature will be sequential, such as DUP#-year-month-date(e.g., DUP1-2022-06- 20, the first duplicate sample of the day June 20, 2022). The primary sample and duplicate sample ID pairs will be recorded in the field logs. The purpose of collecting field duplicates is to assess the consistency of the overall sampling effort, including collection, transport, and analysis. The purpose of submitting blind duplicate samples is to assess the consistency or precision of the laboratory's analytical system. Two soil duplicate samples and one subslab soil gas duplicate sample will be collected during the investigation and submitted under the same procedures and analyses as the primary samples. 4.2 Sample Handling Procedures 4.2.1 Sample Identification and Labeling Each sample will be identified using the system described below. These identifiers will be used to complete sampling documentation including field notes, boring logs, sample labels and chain-of-custody (COC) records.A COC record form is provided in Appendix C-2.The samples will be identified using the following format: facility identifier (i.e., MMF for Martin Metal Finishing, type of sample (TS for trench sediment, SS for subsurface soil, SV for soil vapor, and VP for sub-slab Vapor Pin TM), location number, and sample depth where applicable. For example, sample MMF-TS-03 will be utilized for the trench soil sample collected at location 4. Similarly, MMF-SS-04-10 will be utilized for a soil sample collected from a depth of 10 ft bgs at boring location four. Labels will be attached to each individual sample container. Each label will include the project number, the sample identification number, date and time collected, the sampler's initials, and requested analyses. 4.2.2 Chain of Custody All samples to be submitted for laboratory analysis will be documented on a COC (Appendix C-2). The COC will list the sample identifier, date and time of sample collection, analyses requested, and the turnaround time for the analysis. COC forms will be signed by field staff and accompany all sample shipments and deliveries to laboratories. Appendix C-1 includes CDIM SOP 1.0 "Chain of Custody'. CDIM—Fairgrounds Industrial Park Page 9