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Working To Restore Nature 3.0 PREVIOUS ENVIRONMENTAL WORK The results of previous environmental investigations performed at this site are included in the reports listed in the references section at the end of this report. .1 Vapor Extraction Test A one-day vapor extraction test (VEI) was conducted at the site o Sept=28, (RFSNA, October 13, 1992) I.ow atnd inconsistent observation well vacuums were recorded during the VET (Table 2A, Vapor Extraction Test Monitoring Data, September 28, 1992). ' These low observation well vacuums can be attributed to the varying lithology beneath the site, which consists mainly of clay and clayey silt interbedded with layers of sand and silty sand. ' Upon evaluation of the data from this test, we estimated that additional wells would be needed to properly assess the feasibility and area of influence of a VES Subsequently, vapor extraction well VW-4 was installed with a screened interval of 33 to 40 feet and a dual-completion well (VW-5) was installed with one casing having a screened interval of 10 to 30 feet and the other 1 33 to 40 feet. A new VET was scheduled following installation of these wells ' The second one-day VET was performed at the site o January 1$, 199 The VET had two objectives: to collect site specific and elevation specific data to evaluate the feasibility of vapor extraction as a soil remediation alternative and to evaluate the off-gas treatment alternatives, if applicable. ' The equipment utilized for the VET consisted of an internal combustion (LC ) engine, instrumentation for measuring air flow, velocity, pressure, and temperature, polyvinyl chloride piping, fittings, and wellhead connections, and a portable organic vapor analyzer and air sampling apparatus RESNA operated the vapor extraction testing equipment for approximately ' six hours. ` 38009-8138009-8 FRP 5 1