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SECTION 4 CONCLUSIONS Based on the results of the soil and groundwater sampling in the borings and the composite surficial soil sampling, the following conclusions are made with respect to the environmental conditions observed at the subject property: • No physical indication (i.e., appearance or odor) of environmental impacts was observed in any of the soils or groundwater sampled at the property. • Analyses for total recoverable petroleum hydrocarbon (TRPH) in soils from the borings and in the groundwater grab samples all yielded non-detect results. Further, analyses of the groundwater grab samples for total petroleum hydrocarbons in the gasoline and diesel ranges (TPH-g, TPH-d) and for volatile organic compounds (VOCs) also yielded non-detect results. Therefore, no indications of impacts to subsurface soils or groundwater from petroleum hydrocarbons or VOCs were found in the study area. • Analyses for organochlorine pesticides and chlorinated herbicides in surficial soil composite samples and groundwater grab samples yielded non-detect results with one exception. The herbicide Dalapon (2,2-dichloropropionic acid) was found in one composite surficial soil sample at a concentration of 270 ug/kg, which is just above the detection limit for this compound. Soils containing trace Dalapon residues are not regulated as hazardous waste. Further, the concentration found in the soil is below the USEPA Region IX Preliminary Remedial Goal (PRG) for Dalapon in residential use soils. Therefore, no indications of any significant impacts to soils or groundwater from these types of pesticides and herbicides were found in the study area. • WESTON concludes that the existing site soils and the groundwater at the subject property do not appear to show evidence of environmental impacts that would present a concern with respect to the proposed development of the property. SAwhc\wp\sharedI\projects\homedepo\tracyph2.doc 4-1 July 1999