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Cleanup in Vulnerable Communities'Initiative Discovery Project Reference:Favorite Cleaners and Enforcement Discovery Investigation Work Plan Project Number:60688620 3.2.6.2 Analyses of Groundwater Samples Groundwater samples will be analyzed for VOCs using USEPA Method 82606.The laboratory detection limits are included in Appendix D. 3.2.6.3 Analyses of Indoor/Outdoor ambient air Samples Active indoor/outdoor ambient air samples will be analyzed for VOCs plus oxygenate compounds using USEPA Method TO-15 SIM and (USEPA Method TO-15 SIM for residential only). The laboratory detection limits are included in Appendix D. 3.2.6.4 Laboratory Quality Control Samples The selected off-site fixed laboratory will be Eurofins Air Toxics, Inc., a State-certified laboratory in Folsom, California. As part of the standard laboratory QC protocols,the off-site fixed laboratory will monitor the precision and accuracy of the results of their analytical procedures through analysis of laboratory QC samples.These samples include designated for matrix spike/matrix spike duplicate(MS/MSD)analysis for organic parameters or spike duplicate(S/D) analysis for inorganic parameters. MS/MSD or S/D analysis is performed on an aliquot(portion)of a field sample selected by the laboratory under a prescribed rate. It is not a separate sample, but a special designation of an existing sample.At a minimum, one spike analysis is required per 20 samples as per USEPA protocol for definitive- level data. During sampling for aqueous matrices, double volume is required for laboratory QC purposes.All extra containers for laboratory QC purposes will be labeled with the same sample name as the primary sample. Tables 1, 2, and 3 indicate which samples will be the designated laboratory QC samples;these locations were selected at random, because there are no previous data available to estimate which locations may have moderate contaminant concentrations. Other laboratory QC samples include method blanks, surrogates, laboratory duplicates, laboratory control samples, and dilution procedure duplicates as required in the applicable USEPA-approved methods and laboratory QC systems.The laboratory will report results for these QC samples in the data packages. 3.2.7 Sample Containers and Preservatives Tables 1 to 3 show the requirements for analytical methods, sample containers,volumes, preservatives, and holding times by parameter per matrix. The laboratory will provide sample containers prior to the sampling events.The containers will be pre-cleaned to meet USEPA standards and will not be rinsed in the field prior to sample collection. Prior to delivery of sampling containers,the laboratory will add preservatives required in the containers for aqueous samples.Water sample containers will be filled to the top without any air bubbles, capped, and inspected to make sure no headspace is present. If headspace larger than a pea is present in the sample,the sample will be discarded, and another sample will be collected. If any water sample containers are not filled completely,the sample volume level will be marked on the outside of the container with indelible ink. 3.2.8 Water Sample Collection, Packaging, and Shipment A sample label will be affixed to each sample container with clear tape for proper identification in the field and for tracking in the laboratory. The sample labels will include the following information: • Job number; • Sample identification number; • Sampler's initials; • Date and time of collection; and • Preservative, if any. Following collection and labeling, samples will be immediately placed in a sample cooler for temporary storage.The following protocol will be followed for sample packaging: Prepared for: California Department of Toxic Substances Control AECOM 21