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Kennedy/Jenks/Chilton multiple chemicals, was also calculated. An HI of greater than or equal ' to one indicates an unacceptable risk The calculated HI for the site was 6 9. It was found that the high concentrations of 4,4'-DDT had the greatest ' contribution to the calculated HI Therefore, the calculations were made using only those soil samples with 4,4'-DDT concentrations less than 1,000 ug/Kg. This calculation was made to estimate the potential ' health risk posed by the soil at the site if soil containing 4,4'-DDT at concentrations exceeding 1,000 ug/Kg was removed. These calculations indicated that the resulting health risk posed by soil remaining at the site would be in the acceptable range following remediation of soil ' containing concentrations of 4,4' -DDT greater than 1,000 ug/Kg. Based upon the laboratory analyses results and the HHA, four areas were identified at the sales yard where DDT exceeded 1,000 ug/Kg. These ' areas, Areas 1, 2, 3 and 4 are shown on Figure 7. Remediation Alternatives The Preliminary Site Investigation Report identified five remediation alternatives for soil containing pesticides at the Cal -Farm facility ' The alternatives identified were. The "no-action" alternative would result in no further work being performed on the property concerning the DDT soils If this alternative is chosen, it is most likely that a deed restriction will be required for this property. ' Rather than using TTLC criteria, cleanup levels could be derived from a human health assessment using health-based criteria This assessment would consider the intended future use of this property which at the present time is assumed to be industrial . ' Remediation of these soils could include excavation, treatment, and backfilling of treated material on-site. It should be noted that ' treatment technologies for DDT are only in the developmental stages and that the EPA has not approved any treatment technology to date Another option for remediating these soils could entail excavation ' and disposal of the sods containing elevated levels of DDT at a Class I hazardous waste facility ' Another option would be to excavate and store on site the DDT- bearing sods until acceptable treatment technologies are identified by the EPA. Although this may be technically feasible, ' the Cal -Farm Stockton property may then be considered as a Treatment, Storage, and Disposal (TSD) facility requiring appropriate permits. Therefore, this alternative may not be practical . I ' WPI13 2.3 882526.01