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7.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The analytical results of soil from the bioremediated treatment cell indicate that BTEX <br /> constituents were non-detect and TPH as diesel ranged from non-detected to 32 ppm. <br /> The highest value for TPH diesel was cell #7 which was sampled back in October, <br /> 1993 and is most likely much lower at this time. The analyses show that the <br /> bioremediation of diesel impacted soils from the excavated site have lowered <br /> concentrations to well below the regulatory criteria of 100 ppm for TPH (diesel) and <br /> non-detected for BTEX. Therefore, AGI recommends closure of the Derickson trucking <br /> site. <br /> 8.0 LIMITATIONS <br /> AquaGeosciences, Inc. performed this investigation in accordance with <br /> generally accepted standards of care which exist in California at this time. It <br /> should be recognized that definition and evaluation of geologic conditions is a <br /> difficult and inexact science. Judgments leading to conclusions and <br /> recommendations are generally made with limited knowledge of surface <br /> conditions present. No warranty expressed or implied, is made. <br /> 9 of 9 <br />