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5.0 CONCLUSIONS <br /> Based on Geocon's review of the soil and groundwater data acquired through October 1996, <br /> summarized below are conclusions regarding the environmental investigations performed at the site: <br /> • Based on current soil analytical data, the majority of the residual TPHg currently remaining in <br /> soil is located beneath the gasoline and diesel UST excavation to a depth of approximately 65 <br /> feet bgs. <br /> • The lateral limits of residual TPHg in on-site vadose zone soil are confined to the immediate <br /> vicinity of the UST excavation and are generally bounded by borings MW-3, SB-2 and SB-3. <br /> • The volume of TPHg-impacted vadose zone soil is estimated at 1,500 cubic yards. <br /> • The soil analytical data obtained from this investigation provided the ability to reasonably <br /> estimate the lateral distribution of petroleum hydrocarbons in soil beneath the site and initiate <br /> corrective action planning. Evaluation of the site conditions and data obtained from the vapor <br /> extraction pilot test indicated that soil vapor extraction is feasible and the most cost effective <br /> remediation technology for the impacted soil. <br /> • TPHg, TPHd, BTEX and MTBE exist in groundwater beneath the site with the majority of <br /> dissolved mass located in the vicinity of the former USTs. <br /> Project No.S8100-06-11C -6- December 17, 1996 <br />