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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 Analytical Method Parameters Soil Gas Survey Samples Modified USEPA Method 8260B USEPA Method TO-15 Target VOCs plus oxygenate compounds Indoor/Outdoor Air Samples USEPA Method TO-17 USEPA Method TO-15 SIM Target VOCs plus oxygenate compounds 3.2.6.1 Analyses of Soil Gas Samples Soil gas samples can be either analyzed with TO-15 or Method 8260, modified for air analysis as indicated in DTSC's 2015 advisory.TO-15 analysis should be NELAP-certified, and Method 8260 should be certified for soil and water. The laboratory protocols for Method 8260 and TO-15 should follow the recommendations in Appendix C of Cal-EPA's 2015 Soil Gas Advisory and the guidelines in SW-846.The soil gas samples should be analyzed for the full suite of analytes including, but not limited to, BTEX, naphthalene,freons, PCE,TCE, and their breakdown products. Analytical reporting limits should not exceed 0.5 pg/m3. 3.2.6.2 Analyses of Water Samples Water samples will be analyzed for VOCs using USEPA Method 8260B. The laboratory detection limits are included in Appendix E. 3.2.6.3 Analyses of Indoor Air Samples Active indoor air samples will be analyzed for VOCs using USEPA Method TO-15 SIM.The laboratory detection limits are included in Appendix E. 3.2.6.4 Laboratory Quality Control Samples The selected offsite fixed laboratory will be Eurofins Air Toxics Laboratory, a State-certified laboratory in Folsom, California.As part of the standard laboratory quality control protocols,the offsite fixed laboratory will monitor the precision and accuracy of the results of their analytical procedures through analysis of laboratory QC samples.These protocols include samples 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 quality control 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,detection limits, sample containers,volumes, preservatives, and holding times by parameter per matrix.The laboratory will provide sample containers prior to 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. 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. Prepared for: Department of Toxic Substances Control AECOM 18