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' 3.0 DESCRIPTION OF SITE ACTIVITIES AND ASSOCIATED HAZARDS <br /> In the first phase of the remedial investigation, PRC will conduct field screening soil gas <br /> sampling using GeoprobeP sampling equipment Using information from the first phase, the second <br /> ' phase of the investigation will consist of soil borings and ground-water monitoring well installation to <br /> fully characterize site contaminant distribution and aquifer hydraulic properties <br /> 1 <br /> 3.1 Soil Gas Sampling <br /> PRC will use field analytical screening to help guide the remedial investigation at UST 817 <br /> ' B-2 The field screening features a mobile hydraulic sampling system (Geoprobe®) complemented by <br /> a laboratory-grade gas chromatograph and headspace analyzer The GeoprobO uses a hydraulic press <br /> ' and hammer to drive 1-inch or 2-inch diameter sample collection devices The potential chemical <br /> hazards during this task include inhalation and dermal contact with the contaminated material The <br /> ' hazards associated with this activity are viewed as being low risk Airborne concentrations of organic <br /> and inorganic compounds from the soil at this site are expected to be below OSHA Permissible <br /> Exposure Levels (PELs), and Immediately Dangerous for Life and Health concentrations (IDLH) <br /> ' Personnel will use a Photoionization Detector (PID), Organic Vapor Analyzer (OVA), or a <br /> Combustible Gas Indicator (CGI), to assess organic vapor concentrations Appropriate safety <br /> ' precautions, in addition to the selection and use of proper level of protection will be followed at all <br /> times It is anticipated that D level personal protection will be sufficient to protect the personnel who <br /> will be performing this activity <br /> 3.2 SOIL SAMPLING <br /> 1 <br /> Three soil borings will be drilled within the immediate vicinity of the tank excavation to a <br /> ' depth of approximately 20 feet below ground surface (bgs ) An additional five soil borings will be <br /> drilled, based on field screening data, also to a depth of approximately 20 feet bgs Soil samples will <br /> ' be collected at a minimum of 5 foot intervals in all boreholes All of the borings will be completed <br /> as monitoring wells <br /> CT0162 HSP <br /> 0$"162UTATRI-05/05193 6 <br />