Human Health Risk Assessment - Raytheon

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12 Human Health Risk Assessment DRAFT 4-methylphenol, methylene chloride, and tetrachloroethene), maximum concentrations exceed their respective CTL values and these constituents were retained as COPCs. The list of 25 COPCs are indicated below and in Table 1 and consist of chlorinated VOCs, miscellaneous solvents (acetone, carbon disulfide), hydrocarbons (e.g., toluene, ethylbenzene, xylenes, trimethylbenzenes and isopropylbenzene), phenols, and 1,4-dioxane. On-Site COPCS Chlorinated Miscellaneous VOCs Solvents 1,1,1-trichloroethane acetone 1,1,2-trichloroethane toluene 1,1-dichloroethane ethylbenzene 1,1-dichloroethene o-xylene chloroethane m, p-xylene chloroform carbon disulfide cis-1,2-dichloroethene isopropylbenzene 1,2-dichloropropane 1,2,4-trimethylbenzene methylene chloride 1,3,5-trimethylbenzene tetrachloroethene 4-methylphenol trans-1,2-dichloroethene phenol trichloroethene vinyl chloride 1,4-dioxane Off-Site Groundwater. Chlorinated VOCs and miscellaneous solvents were also detected in groundwater samples collected at off-Site locations. Constituents exceeding screening criteria are identified below and in Table 2. Off-Site COPCs Chlorinated Miscellaneous VOCs Solvents 1,1-dichloroethane 1,2,4-trimethylbenzene 1,1-dichloroethene 1,4-dioxane 1,2-dichloroethane benzene cis-1,2-dichloroethene ethylbenzene methylene chloride isopropylbenzene trichloroethene toluene vinyl chloride o-xylene m, p-xylene
13 Human Health Risk Assessment DRAFT The list of COPCs identified in off-Site groundwater includes two constituents not identified as COPCs on-Site (benzene and 4-methyl-2-pentanone, also known as methyl isobutyl ketone or MIBK). However, because both benzene and MIBK have been detected in deep groundwater on-Site at concentrations exceeding groundwater CTLs (GCTLs), both constituents have been retained as off-Site COPCs. Chloromethane was detected in 4 of 413 samples collected off-Site at a maximum concentration of 3.3 µg/L, which exceeds the GCTL of 2.7 µg/L. However, because chloromethane was not detected on-Site, is commonly found in outdoor air and is unlikely to be Site-related, it was eliminated as a COPC. 3.2 COPCs Detected in Air and Soil Vapor 3.2.1 Soil Vapor Sampling To address potential exposures via soil vapor intrusion to indoor and outdoor air, soil vapor samples were collected from 9 on-Site and 20 off-Site locations and analyzed for volatile organic compounds (VOCs). 2 Soil vapor sampling results are presented in SARA Table 12 and soil vapor sampling locations are shown in SARA Figure 3-4. The primary constituents detected in soil vapor samples collected from beneath the buildings on-Site were CVOCs including trichloroethene (TCE), 1,1,1-trichloroethane (TCA) and their degradation products cis-1,2-dichloroethene (cis-1,2-DCE), trans-1,2-dichloroethene (trans-1,2- DCE), 1,1-dichloroethene (1,1-DCE) and 1,1-dichloroethane (1,1-DCA). None of these constituents were detected in soil vapor samples collected off-Site. Also detected on-Site, but at much lower concentrations, were a number of constituents commonly detected at low levels in outdoor air including toluene, xylenes, acetone, carbon disulfide, and MEK as well as chloroform and tetrachloroethene (PCE). The primary constituents detected in off-Site soil vapor samples were the BTEX chemicals (benzene, toluene, ethylbenzene and the xylenes), acetone, carbon disulfide, methyl ethyl ketone (MEK) and chloroform. The BTEX chemicals are found in gasoline and emitted in vehicle tailpipe emissions; consequently, they are widely distributed throughout the environment. Acetone and MEK are common solvents found in consumer products and routinely detected in outdoor air. Chloroform has been detected on-Site, but is also a drinking water disinfection byproduct commonly found in indoor air. Chloroform is also found in the reclaimed water supplied by the City of St. Petersburg, which Raytheon uses to irrigate the landscaping on-Site. Carbon disulfide is found naturally in ocean and coastal waters and also generated by bacteria in soil. 2 The target analyte list for soil vapor and indoor air samples differed from the target analyte list for groundwater samples and did not include the following COPCs: trimethylbenzenes, isopropylbenzene, phenol, 4-methylphenol and 1,2-dichloropropane.
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DRAFT Table 1. Constituents of Pote
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DRAFT Table 3. Comparison Between I
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DRAFT Table 5. Estimated Exposure P
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DRAFT Table 6. Summary of Exposure
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DRAFT Table 8. Source and Derivatio
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Human Health Risk Assessment DRAFT
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DRAFT Primary Primary Secondary Sec
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DRAFT Table A-1. Dose and Risk Calc
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DRAFT CSFd RfDd DA event C w DAD LA
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DRAFT CSFd RfDd DA event C w DAD LA
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DRAFT Table A-13. Dose and Risk Cal
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Human Health Risk Assessment - Raytheon

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