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HUNICK-�-If EMIR <br /> Mr. Charles Leubner <br /> 6 February 1998 <br /> Page 3 <br /> depth (or deepest sample collected), and one oth r sample that is the likeliest to contain high <br /> concentrations of. hydrocarbons based on field observations such as staining, odors, or field <br /> screening for the presence of elevated organic vapors using a portable organic vapor analyzer. <br /> If groundwater is encountered, drilling will be terminated and a groundwater sample will be <br /> collected. Based on Fall 1996 groundwater contoar maps of San Joaquin County, groundwater <br /> levels in the vicinity of Edison High School are estimated to be between 30 and 40 feet below <br /> ground surface. <br /> Qualitative Field Screening <br /> To provide a preliminary indication of possible contamination, a portable organic vapor detector <br /> will be used to monitor for the presence of organic vapors in soil collected from the borings. This <br /> field screening method consists of filling a Zip Lock plastic bag to about one-third it's capacity <br /> with soil and sealing the container. After allowing sufficient time for the soil vapor to equilibrate <br /> with headspace, the bag will be opened enough to allow for insertion of an organic vapor analyzer <br /> probe. The field monitoring will be conducted using an OVA equipped with a flame ionization <br /> (FID) or a photoionization detector (PID). The concentration of organic vapors detected by the <br /> OVA will be recorded on the boring log. Field screening will also include documenting visual <br /> indications for the presence of contamination, such as staining, discoloration, and/or chemical <br /> sheens. <br /> Task 2 - Laboratory Analyses <br /> The six soil samples will be analyzed for total petroleum hydrocarbons as diesel (TPH-D) by <br /> EPA Method 8015 and benzene,,toluene, xylenes and ethylbenzene (BTEX) by EPA Method <br /> 8020. The groundwater sample, if collected, will be analyzed for TPH-D by EPA Method 8015, <br /> and BTEX by EPA Method 8020, <br /> Task 3—Submit Soil Investigation Report <br /> Following receipt of laboratory °results for soil and groundwater samples, a report will be <br /> prepared presenting the results and conclusions of the investigation. If hydrocarbons are not <br /> detected in groundwater, the US EPA Vleach Model will be used to evaluate the potential <br /> impacts on groundwater of hydrocarbons remaining in the soil. If hydrocarbons are detected in <br /> groundwater, the ASTM RSCA Model will be used to evaluate risk associated to humans from <br /> inhalation exposures to the hydrocarbons present in groundwater. <br />