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2.7.8 Tarqet Compounds A VOCs 1. ASGI-Targeted Compounds: The ASGI (dated February 25, 1997) includes 23 primary and four(4) other target VOCs. All quantifiable results should be reported. 2. Others: The estimated results of all Tentatively Identified Compounds [TICs]) or non-AGSI-targeted compounds detected should be included in the report. If TICS or non-ASGI- targeted compounds are identified, contact the Agency to determine whether additional action is required (e.g., running additional standards to quantify TICs or non-ASGI compounds) and whether the use of these estimated data for risk evaluation is appropriate. B. Leak Check Compounds: All quantifiable results should be reported as specified in Section 2.4.4.E. C. Specific Compounds: Based on the site history and conditions, analyses for specific compounds may be required by the Agency staff. Examples include: 1. In areas where USTs or fuel pipelines are identified, soil gas samples should be analyzed for oxygenated compounds[e.g., methyl tertiary butyl ether(MTBE), ethyl tertiary butyl ether (ETBE), di-isopropyl ether(DIPE),tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), and ethanol]; 2. At oilfield sites where semFVOCs or Total Petroleum Hydrocarbons (TPHs) are detected in the soil gas samples, fixed and biogenic gas (02, CO2, and CK) data should be obtained using a Thermal-Conductivity Detector(TCD)or a hand-held instrument; 3. At petroleum contaminated sites(including oilfields), dairies, wetlands, landfills or other sites where the presence of methane and/or hydrogen sulfide is suspected, soil gas samples should be analyzed for methane and/or hydrogen sulfide; 4. At sites where use of chlorinated solvents with 1,4-dioxane is suspected or known to exist, soil gas samples may be analyzed for 1,4-dioxane with a detection limit of 1 µg/L; or 5. See Section 2.7.9.A.4 below. 01/28/2003 - 18-