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' GEORGE SCHULER INC. <br /> Remedial Excavation Report <br /> Page: 3 <br /> I 3.0 SOIL CONDITIONS <br /> The soil stratigraphy exposed in the remedial excavation at the site is characterized by <br /> interbedded layers of clay and clayey silt (Appendix Q. Although these sediments would <br /> ordinarily be considered relatively impermeable, secondary porosity and permeability has <br /> been created by roots casts, primarily in the clayey beds. This secondary porosity ranges. <br /> from a low o£2 percent up to a high of 20 percent. Due to the nature of these voids, it is I <br /> probable that they are connected, producing a permeable section. <br /> Secondary calcite is also present in these sediments in the form of caliche from seven feet <br /> down to 22 feet. This caliche forms a hardpan layer one foot thick at 9.5 fees._ <br /> Nevertheless, the root casts are not completely filled with caliche, even in the hardpan <br /> layer, which has a root cast induced porosity of 20 percent. <br /> 4.0 CONCLUSIONS AND RECOAJALENDATl <br /> ONS <br /> Approximately 400 cubic yards of soil have been removed and disposed of as a result of <br /> an underground tank leak at the Schuler property. Soil was excavated to a maximum <br /> depth of 30 feet. Laboratory analyses indicate that most of the contaminated soil has been <br /> removed. However, due to the concentrations of gasoline and benzene remaining at 3,0 l <br /> feet and the strong odors and high PID readings of the west and south walls, addition--d <br /> I work may be warranted.-The need for soil borings and sampling, for further definition of <br /> contamination, should be discussed with the local regulatory agency upon review of this <br /> report. <br /> I <br /> f <br /> I <br />