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COMMENTS ON HRA (9/11/90) FOR <br /> BECK DEVELOPMENT CO. SITE, TRACY <br /> Table 2-2 : The 95% upper confidence level of arithmetic mean <br /> for 4 , 4 - D, D, D does not appear to be accurate. <br /> Please verify. <br /> Table 2-5: The footnote is incomplete. The justification for <br /> excluding chemicals should be included in the text <br /> as well. <br /> Table 2-7 : For carcinogenic PAH' s, the maximum concentration <br /> of less than 3 . 0 E-01 is smaller than the average <br /> concentration of 1. 1 E-00. Is this correct? <br /> Table 3-3 : The RFD (ingestion) for dimethylphthalate is <br /> 1. 0 mg/kg/day. <br /> The chronic toluene RFD (ingestion) is <br /> 0. 3 mg/kg/day, and the subchronic RFD is <br /> 0. 4 mg/kg day. <br /> Table 4-1: For the on-site resident scenario, the potential <br /> of exposure to children has not been addressed. <br /> See previous comments on HRA workplan. <br /> The reference manual (RAGS-Part 1, 1989) <br /> recommends that soil ingestion rate for MEI <br /> (child) be set at 200 mg/day and at 100 mg/day for <br /> AEI (adult) . <br /> Tables 4-2 , 4-3 : It is stated on Page 15 that the calculations <br /> for MEI are based on the 95% UCL' s as shown in <br /> Table 2-6. For AEI, the average concentrations of <br /> chemicals in soil were used. In Table 4-1, the <br /> soil ingestion rates are stated as 106 mg/day for <br /> MEI and 67 mg/day for AEI. It is unclear how the <br /> intake values via soil ingestion were calculated. <br />