These oral MRLs will be used as conservative health-based guidelines to compare the estimated exposures via ingestion of contaminated soils. All other indoor air chlordane levels described in Table 1 are below these levels. Since the levels detected in the home are below the health-based levels described above, harmful effects from the levels of chlordane in indoor air at this residence are not likely to occur in people who live in the home. The maximum concentration of chlordane detected in surface soils was 0.24 ppm. Therefore, the estimated exposure doses in children are not likely to cause harmful effects.
Adults have lower soil intake and therefore are less exposed to the chlordane than children.
Adults also are not likely to experience harmful effects from the chlordane in soil. An increased incidence of liver tumors were observed in laboratory animals that were fed high doses of chlordane in their diet. However, the results of epidemiological studies that investigated the carcinogenicity of chlordane in workers are conflicting and inconclusive. The low air levels of chlordane detected in living areas at this residence would not be expected to pose a significant carcinogenic risk. Although the wipe and wood samples give qualitative information about the presence of chlordane, this information cannot be used to estimate exposure to chlordane.