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02 June 2015 AGE Project No. 14-3154 Page 3 of 6 from depths greater than impacted has migrated or attempting to define the vertical extent of impacted soil. A significant set of analytical data for the project currently demonstrated the "highest' concentrations of adsorbed diesel impact. However, approximately one-half of the soil boring proposed appear to be outside the "know" dissolved diesel plume and therefore, may have no reasonable field indication (PID detection) which may be modified for laboratory selection. 5. As a point of necessity, the soil borings are recommended to be installed following the soil and groundwater remediation, to finalize the plume delineation and further provide field verification of soil and groundwater remediation. 6. The shallow groundwater has been analyzed for methyl tertiary butyl ether (MTBE) at well MW-2 in March 2015. The analytical data for that sample is attached, demonstrating no significant MTBE detection down gradient or cross gradient of the dissolved diesel. Selected soil samples and grab groundwater samples collected will additionally be analyzed for MTBE. 7. Two sumps are located on the north edge of the building interior and two nearly identical sumps with centripetal water pumps are located under the furnace, at the southern edge of the building interior. DUAL PHASE EXTRACTION REMEDIATION AGE proposes to operate a temporary DPE (high vacuum) groundwater remediation system within the free-phase petroleum and known soil plume. The objective of the DPE is to remove free-phase petroleum and petroleum impacted soil within the saturated and unsaturated zones. The proposed interim remedial technology includes a high vacuum dual-phase extraction system intended to remove hydrocarbons from the vadose, capillary fringe and upper saturated zones. After remediation well installation, AGE proposes performance of three months of DPE to mitigate soil and groundwater to acceptable concentrations that will achieve site closure. DPE specifications are presented below. Recovery of hydrocarbons from the subsurface is often difficult due to the fact that hydrocarbons can exist in the vapor-, dissolved- and liquid-phase. Liquid-phase hydrocarbons both dissolve into groundwater and vaporize into pore spaces between sediment grains. Dissolved phase hydrocarbons also vaporize into pore spaces until equilibrium is established between the liquid, dissolved and vapor phases. Remediation methods effective in treating one phase may not be efficient for the remediation of other hydrocarbon phases. High-vacuum (vacuum pump capable of producing 25 to 27 inches of mercury) dual- phase extraction systems are capable of removing both hydrocarbon vapors and, Advanced GeoEnvironmentnl,Inc.