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Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 23 ' entrained air from the surface through an air bleed valve on the well head During the last stage, no vacuum influence was measured in the observation points It appears that the applied vacuum was entirely expended to lift water from the well, and therefore minimal air was drawn from the vadose zone In the last stage of the test the groundwater pumping flow rate (maximum of 2 5 gpm) and indicated ' drawdown in peripheral monitoring wells were essentially similar to that observed during the groundwater pumping test It was also observed that while HVDPE was capable of drawing groundwater to the surface, the vacuum influence on peripheral vapor monitoring points was negligible, which reduced the overall potential contaminant mass removal through vapor extraction 6 0 CONCEPTUAL REMEDIAL SYSTEM DESIGN I6.1 Remedial Objectives The objective of the conceptual design is to remediate dissolved- and adsorbed-phase hydrocarbons present in the subsurface at the facility t6.2 Remedial Approach and Technical Application The conceptual design, described below, incorporates several site remediation techniques These technologies or combinations of remedial technologies can be used at the Manna Pro facility The pilot test results suggest that the shallow soil at the Manna Pro facility will allow removal of adsorbed-phase hydrocarbons through vapor extraction combined with groundwater depression In-situ soil vapor extraction is one of the applicable technologies for treating impacted sods This approach is applicable only to unsaturated sods susceptible to the effects of an induced air flow (vacuum) Volatilization can also be accomplished by dewatering the sods below the water table saturated zones ' 28198034 070 ❑ GROUNDWATER TECHNOLOGY, INC