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Jerry Lile <br /> February 20, 2004 <br /> Page 2 <br /> COMMENT AND RECOMMENDATIONS <br /> 1) The Remedial Design and Implementation Plan (RDIP) is not signed by an <br /> appropriate professional (i.e. Registered Geologist or Professional Civil Engineer). <br /> RECOMMENDATION <br /> The RDIP should be signed by an appropriate professional. <br /> 2) Pages 5 through 6, Section 4.2.1, Sidewall Sampling: Sidewall samples will be <br /> collected from each side wall that corresponds to the middle of the side wall. The initial <br /> depths of excavations will be one foot below the depth of samples that had <br /> concentrations of contaminants that exceeded the remedial action objectives. In the <br /> example given at the top of page 6 the side wall sample would be collected at a depth <br /> of 2 feet bgs. The sample that contained elevated concentrations of contaminants was <br /> collected from a depth of three feet bgs. The depth of two feet would be most <br /> appropriate if samples from the boring with contamination had a sample from two feet <br /> with higher concentrations of contaminants than the three foot sample. The presence <br /> of contaminants may be the result of the lateral spreading of sand blast grit material. It <br /> also may be possible that contaminants were released at the surface by other means <br /> followed by an adjustment in the grade. <br /> RECOMMENDATION <br /> Collect sidewall confirmation samples from the same depth of samples that had <br /> the highest concentrations of contaminants. <br /> 3) Pages 7 through 9, Section 4.2.2, Bottom Sampling: Confirmation samples from the <br /> bottom of the excavation are not proposed to be collected if a previous sample within <br /> three feet from the bottom depth of the excavation Is clean. Since the presence of <br /> contaminants may be the result of lateral spreading of sand blast grit it is possible that <br /> elevated levels will be present at the bottom of the excavation even if a clean sample <br /> was collected within three feet of the bottom of the excavation. It also may be possible <br /> that contaminants were released at the surface by other means followed by an <br /> adjustment in the grade. <br /> RECOMMENDATION <br /> Collect samples from the bottom of all excavations. <br /> 4) Page 8, second paragraph: It is indicated that excavated soil from an area where a <br /> clean sample was collected will be stockpiled for reuse. This soil will consist of material <br />