Use of California Human Health Screening Levels (CHHSLs) in ...

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(Page intentionally left blank)January 20053-4CHHSLS
4 Evaluation of Other PotentialEnvironmental ConcernsThe importance of identifying all environmental concerns at sites where releasesof hazardous chemicals have occurred is discussed in Sections 1.4 and 2.2. TheCHHSLs provided in Tables 1 and 2 specifically address risks to human healthposed by exposure to contaminated soil and indoor air. At sites affected by highlytoxic but relatively immobile chemicals (e.g., PCBs, DDT, arsenic, etc.), cleanupof contaminated soils to address human health concerns will generally besufficient to address other potential environmental concerns provided thatsensitive ecological habitats are not threatened. In other cases or for otherchemicals, additional environmental concerns may still be present even afterimpacted soils have been remediated to levels sufficient to address risks to humanhealth. This could include leaching of contaminants from soil and subsequentimpacts on groundwater resources, toxicity to terrestrial biota, uptake ofcontaminants in edible fruits or vegetables and nuisance or gross contaminationconcerns.A summary of other environmental concerns potentially posed by contaminants insoil is incorporated into Table 1. This summary compares the CHHSLs to theSFBRWQCB’s ESLs for leaching, ecotoxicity and nuisance concerns. The ESLscan be found at http://www.waterboards.ca.gov/sanfranciscobay/esl.htm.For example, the residential CHHSL for endrin in soil (21 mg/kg) is much higherthan the corresponding ESL for ecotoxicity concerns (0.06 mg/kg). This meansthat ecotoxicity concerns may outweigh human health concerns at sites wherepotentially sensitive habitats are present (designated by an "X" in the Table 1).This is not surprising, since endrin, a pesticide, was specifically formulated to behighly toxic to terrestrial biota.January 20054-1CHHSLS
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Page 8 and 9: document in general. The soil, soil
Page 10 and 11: Soil and soil gas data collected at
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Page 16 and 17: the lookup tables for sites with ot
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Page 20 and 21: esources even though direct exposur
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Page 30 and 31: 3.2 Tier 2 Human Health Risk Assess
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Page 36 and 37: CLRA, 2002, California Land Restora
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Page 62 and 63: as a stand-alone tool for the evalu
Page 64 and 65: Similar ESLs are also provided for
Page 66 and 67: USEPA Region IX staff can be contac

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