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ivlr Harlin Knoll <br /> Environmental <br /> Resources <br /> 22 Page 4 January 1999 Management <br /> P <br /> be submitted for laboratory analysis from within the vadose zone at each <br /> boring location The sample containing the highest PID reading at each <br /> boring location will also be submitted for analysis A sample from the <br /> bottom of each boring will also be submitted for analysis Each boring <br /> will be advanced to a minimum depth of 20 ft bgs to obtain definition of <br /> the depth of impact at each location If PID readings indicate that <br /> chemical impacts have occurred at depths greater than 20 ft bgs, ERM <br /> will extend the total depth (and collect additional soil samples) beyond <br /> the proposed 20-foot total depth The samples will be analyzed for <br /> TPH-g by EPA Method 8015 and BTEX compounds by EPA Method <br /> 8020 <br /> In addition to the soil samples described above, ERM proposes to collect <br /> hydropunch samples at 15 and 20 ft bgs. at boring locations HB-17 and <br /> HB-20 The ground water samples will be analyzed for TPH-g by EPA <br /> Method 8015 and BTEX compounds by EPA Method 8020 The results of <br /> these hydropunch samples will be compared to hydropunch and <br /> monitoring well data previous collected at each tank location to better <br /> define the extent of ground water impacts at each tank location <br /> During the advancement of each boring, a temporary screen will be <br /> placed at the desired depth for collection of a ground water sample <br /> Ground water will be drawn into the temporary well screen for collection <br /> and subsequent laboratory analysis Once the ground water sample has <br /> been collected, the screen will be removed and the boring will be <br /> advanced to the desired depth <br /> REVIEW OF REMEDIAL TECHNOLOGIES <br /> In accordance with County and RWQCB comments, Heinz and ERM are <br /> currently evaluating potential remedial technologies to reduce the <br /> concentrations of benzene in ground water at each former tank location <br /> Remedial technologies being evaluated include <br /> Ground water extraction and treatment, <br /> ® Enhanced bioremediation using oxygen releasing compound, <br /> • ® Enhanced bioremediation using hydrogen peroxide, and <br /> Natural attenuation <br />