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11 September 1996 <br /> AGE Project No. 95-0108 <br /> tPage 9 of 10 <br /> 4.0. CONCLUSIONS AND RECOMMENDATIONS <br /> 4.1. , CONCLUSIONS <br /> The following conclusions were derived from the data collected from the site: <br /> ' Additional hydrocarbon-impacted soil is present in the immediate area of the former-UST <br /> excavation. <br /> • The lateral extent of impacted soil east'ofthe excavation is apparently limited to the vicinity <br /> of the west wall of the final excavation perimeter (sample OX4-2)"and does not extend <br /> laterally to soil boring B7, established in May 1996. - <br /> • Petroleum hydrocarbons were not encountered in soil samples..collected from borings <br /> established south, east and west of the former UST area. <br /> ' The volume of impacted-sail remaining in the vicinity of the fonner diesel USTs is estimated' <br /> to be 360 cubic yards (See Appendix S). <br /> • Based on the concentrations- and characteristics of diesel, it is unlikely that-remaining <br /> impacted soil poses a significant threat to ground water at the site. <br /> Ground water depth at the site.is estimated to be in excess of 50 feet bsg and; therefore is <br /> ' unlikely to be adversely affected by the remaining volume of impacted soil. <br /> • ' Approximately 1,500 cubic yards of TPH-d-impacted soil is stockpiled on-site. Results from <br /> the most recent sampling of-the stockpiled sail,indicates that.only low concentrations of <br /> TPH-d and total x lens remain in the stock iled soil. <br /> y p , <br /> 4:2. RECOMMENDATIONS <br /> Based upon the conclusions,AGE recommends the following: <br /> • : Excavated soil presently stockpiled on-site should be considered "clean".and used as fill . <br /> material. <br /> The former UST area should be granted site closure certification by the PHS-EHD with no <br /> '' additional,investigation or remediation required. <br />