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Jerry Lile <br /> February 20, 2004 <br /> Page 3 <br /> that is excavated to a depth of one foot below the depth of the clean sample. Since the <br /> presence of contaminants may be the result of lateral spreading of sand blast grit it is <br /> possible that elevated levels will be present at a depth of one foot below the depth of <br /> the clean sample. It also may be possible that contaminants were released at the <br /> surface by other means followed by an adjustment in the grade. <br /> RECOMMENDATION <br /> To confirm that stockpiled soil is suitable for reuse, collect samples from the soil <br /> stockpile for laboratory analysis. <br /> 5) Page 10, first paragraph: It is indicated that field duplicate samples will be given a <br /> fictitious identity. It is not indicated at what frequency duplicate soil samples will be <br /> collected. <br /> RECOMMENDATION <br /> Collect duplicate soil samples at a frequency of one duplicate sample for every 10 <br /> samples collected. <br /> If you have questions or require additional information regarding this matter, feel free to <br /> contact me by telephone at (916) 255-3709 or e-mail at jrohrer@dtsc.ca.gov. <br />