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VINICI-I-IIIIfI <br /> Mr. Charles Leubner <br /> 6 February 1998 <br /> Page 5 <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 /> A minimum of three samples will be selected for laboratory analyses from each boring at the <br /> diesel tank and the gasoline tank sites. The soil samples submitted from the borings at the <br /> former location of the underground diesel tank will be analyzed for total petroleum hydrocarbons <br /> as diesel (TPH-D) by EPA Method 8015 and benzene, toluene, ethylbenzene and xylenes <br /> (BTEX) by EPA Method 8020. Samples submitted for laboratory analysis from the borings at <br /> the former location of the underground gasoline tank will be analyzed for total petroleum <br /> hydrocarbons as gasoline (TPH-G) by EPA Method 8015, BTEX by EPA Method 8020, and fuel <br /> oxygenates by EPA Method 8260. <br /> A minimum of two samples from each boring will be selected for laboratory analysis from the <br /> former location of the remote fill piping. These samples will be analyzed for the same <br /> constituents as the diesel tank site. <br /> Task 3—Submit Soil Investization Report <br /> Following receipt of laboratory results for soil samples, a report will be prepared presenting the <br /> results and conclusions of the investigation. The US EPA Vleach Model will be used to evaluate <br /> the potential impacts on groundwater of hydrocarbons remaining in the soil. <br /> The report will include a site map showing the location of the soil borings, a description of <br /> sampling protocol, and tabulated results from the soil and groundwater analyses. It will also <br /> include the results of the modeling analysis and a recommendation for future action. <br /> SCHEDULE <br /> Because the Stockton Unified School District intends to solicit bids for conducting the site <br /> investigation, a schedule for completing the work cannot be provided at this time. However, <br /> once a consultant has been selected, the District will request that the field investigation be <br /> completed within four weeks of signing an agreement with the consultant, and the site <br /> investigation reports be submitted within five weeks of receiving written reports from the <br /> laboratory. <br />