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Cleanup in Vulnerable Communities'Initiative Discovery Project Reference:Favorite Cleaners and Enforcement Discovery Investigation Work Plan Project Number:60688620 12. Glass fiber and strapping tape; 13. 55-gallon steel drums for storage of IDW; 14. Paper and cloth towels; 15. Isopropyl alcohol; and 16. Field sampling sheets and chain-of-custody forms. Drilling equipment will be provided by the subcontractor, which may include(but is not limited to)the following: hand auger, direct-push technology or HSA drill rig, drive sampler, extension rods, and stainless-steel sample tubes. 3.2.6 Sample Analysis USEPA-approved analytical methods will be used to produce definitive-level data for use in the quantitative risk assessment. Screening-level data will be obtained from sub-slab vapor samples, soil vapor samples, indoor and outdoor ambient air samples, and, if encountered,from groundwater samples. Groundwater samples will be collected via grab groundwater collection. Groundwater sample analytical results will be considered screening-level data due to the method of sample collection, even though USEPA-approved analytical methods will be used. Soil vapor samples will be collected via permanent soil vapor and sub-slab vapor pins.The selected subcontractor will perform active soil vapor sampling, and all samples will be analyzed at the selected laboratory. The SOP for active soil vapor investigations is presented in the Programmatic QAPP. Off-site soil vapor, sub-slab vapor, and indoor air analytical services will be provided by a laboratory that is accredited by the ELAP. The selected laboratory is Eurofins Air Toxics, Inc. in Folsom, California.The selected laboratory for groundwater samples is Eurofins CalScience of Tustin, California. The laboratory QA manual and SOPS are presented in Appendix D of the Programmatic QAPP.The laboratories will be instructed to report estimated values, i.e., between the MDL and reporting limit, with a"J"qualifier. The following analytical methods will be used for the samples collected in this Discovery Investigation. Full analyte lists and laboratory reporting limits are presented in the Programmatic QAPP. Analytical Method I Parameters Soil Vapor and Sub-Slab Vapor Samples USEPA Method TO-15 Target VOCs plus oxygenate compounds Indoor and Outdoor Ambient Air Samples USEPA Method TO-15 SIM Target VOCs plus oxygenate compounds Groundwater Samples USEPA Method 8260B VOCs(including oxygenate compounds) 3.2.6.1 Analyses of Soil Vapor Samples Soil vapor samples can be either analyzed with USEPA Method TO-15 SIM or Method 8260, modified for air analysis as indicated in DTSC's Soil Gas Advisory(DTSC 2015b). USEPA Method TO-15 SIM analysis should be NELAP- certified, and USEPA Method 8260 should be laboratory certified for soil and water. The laboratory protocols for USEPA Method 8260 and USEPA Method TO-15 SIM should follow the recommendations in Appendix F of DTSC's Soil Gas Advisory(DTSC 2015b)and the guidelines in USEPA Method SW-846.The soil vapor 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 will meet appropriate and applicable risk-based screening levels for each analyte reported. Prepared for: California Department of Toxic Substances Control AECOM 20