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Soil vapor samples will be collected from existing and newly installed soil gas probes as noted in Section <br /> 3.2.2. Soil gas samples will be sealed, labelled, and transported under chain-of-custody protocols to a <br /> California certified laboratory to be analyzed for the following: <br /> • VOCs via EPA Method TO-15; and <br /> • Fixed gases, including helium, methane, oxygen, and carbon dioxide via ASTM Method D-1946. <br /> 4.2.5 Indoor Air Sampling <br /> Two indoor, one duplicate, and two outdoor ambient air samples will be collected from the former Quality <br /> Cleaners suite; three indoor, one duplicate and one outdoor ambient air samples will also be collected from <br /> the supermarket building. Sample collection will be conducted in accordance with the DTSC Advisory—Active <br /> Soil Gas Investigations with controls taken to ensure that indoor air quality is representative of actual <br /> conditions. Air samples will be collected in 6-liter Summa canisters equipped with stainless steel flow <br /> controllers, calibrated to maintain constant flow over an eight-hour sampling period. To ensure representative <br /> air conditions, all windows and doors will be closed, and the air conditioning system will not be operating at <br /> least 48-hours prior to sample collection. Please refer to Figure 5 for proposed indoor and outdoor/ambient <br /> air sampling locations. <br /> Indoor and outdoor ambient air samples will be analyzed for VOCs via EPA Method TO-15. <br /> 4.3 Decontamination <br /> All sampling equipment will either be new and dedicated to the sampling location or cleaned in a solution of <br /> laboratory grade detergent and rinsed with distilled water or steam cleaned prior to use. Sample personnel <br /> will utilize dedicated disposable gloves and other similar field sampling hygiene practices to minimize the <br /> chance for cross-contamination between sampling locations. <br /> 4.4 Waste Management <br /> Investigation derived waste (IDW)will be temporarily stored on-site in approved 55-gallon drums throughout <br /> the field portion of the investigation. IDW will be sampled and analyzed according to the requirements of the <br /> selected disposal facility. <br /> Following receipt of the analytical results, IDWs will be disposed upon the generator's selection of the <br /> disposal facility, obtaining an EPA Identification Number (if needed), signing waste manifests, and <br /> determining waste characteristics and classification. <br /> 4.5 Sample Handling <br /> 4.5.1 Sample Containers <br /> Groundwater samples will be collected into 40-mL VOAs with hydrochloric acid (HCI) or other preservatives <br /> as provided by the laboratory. <br /> Soil gas probe and SVE well samples will be collected via Teflon sampling tubing into batch-certified, <br /> laboratory-provided Summa canisters with dedicated flow controllers for each sample. <br /> 3989.0001S101/R Revised Data Gap Investigation Work Plan I ROUX 110 <br />