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GwkwicdTechnics Inc. Page 4 <br /> McGranahan(Gawne Road) <br /> Project No.251.2 <br /> February 9,1996 <br /> specific subsurface units. If it is determined that the soils impacted with petroleum <br /> hydrocarbons are oxygen deficient which`would limit the natural biodegradation <br /> process, then we would have the necessary evidence to support the need for at least <br /> limited engineered controls to provide the necessary oxygen. <br /> We propose to use the SimulProbe tool to gain this empirical information. This tool <br /> is able to collect a discrete soil sample and at the same time and point, collect a <br /> discrete soil gas sample. In this manner we can evaluate the actual oxygen <br /> concentrations at specific intervals and correlate with the geology and geotechnical i <br /> and chemical parameters. We can also use soil gas information (TPH-gasoline) to <br /> - - ->e�estima#e-the=mass-of-contaminant.in-the-vapor,phase._ <br /> 1.4 Well Survey <br /> In order to identify potential groundwater use receptors in the vicinity of the release <br /> we propose to conduct a well survey. The survey will identify locations and <br /> construction details for all wells in a 2;000 ft radius. We will conduct a visual <br /> inspection in the area to locate any wells in the area. We will request information <br /> regarding well records from the SJCPHSEHD and the State of California Department <br /> of Water Resources (DWR). <br /> 1.5 General Health Risk Assessment <br /> A general health risk assessment is proposed to identify potential receptors during <br /> assessment or remedial activity. We intend to identify nearby potential preferential <br /> migration pathways and potential recharge areas. The scope of the assessment will <br /> include a comprehensive site inspection and accessing building department records i <br /> for information pertaining to the on site septic system and below grade structures. <br /> I' <br /> E <br />