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r <br /> DeBOER TRUCKLINEs <br /> EVC <br /> Remedial Excavation Report <br /> Page: 3 <br /> 1 <br /> 1 , <br /> The excavation was logged (Appendix B) under the direct supervision of a <br /> [ registered geologist using the Unified Soil Classification System. The color, E <br /> texture, moisture, plasticity (if applicable), consistency of the earth materials .g <br /> pertinent soil or bedrock characteristics, and any evidence of contamination was <br /> +,. noted. <br /> 3.0 SOIL CONDITIONS . <br /> The soil profile exposed in the DeBoer Trucking excavation is comrposed of units of silt <br /> and sand. The"highest unit, which was seen just below the layer of fill material at 3.5 feet, <br /> is a"hardpaii layer about one half foot in thickness. The hardpan comprises the uppermost <br /> portion of a micaceous silt unit which extends down to a depth of ten (1-0) feet. The silt is <br /> E brittle, containing root casts, and is cemented with calcite in the hardpan layer. <br /> Beneath this upper silt unit, is a three foot thick medium-grained cross-bedded sand which <br /> is stained brown by secondary iron oxides. The cross-bedded sand is underlain by mother <br /> silt bed, similar to the upper layer, which is five feet thick. <br /> The excavation bottomed in a fine to medium-grained sand unit which is loose and clean_ <br /> and moderately well sorted. This unit contains embedded pebbles up:to 8.0 millimer.ers in <br /> diameter., This permeable sand was not penetrated by the excavation;so it has a mi ium <br /> thickness of seven (7) feet.. <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Approximately 440 cubic yards of soil have been removed and stockpiled as a resuft of an <br /> underground tank leak at the DeBoer Trucking property. a Soil -was excavated to <br /> maximum depth of 25 feet. The excavation work was terminated when it became apparent <br /> that the contamination in the soil was not diminishing much in depth or lateral extent_ ;M <br /> Ground water is suspected to be encountered at approximately 30 feet in depth. <br /> WBF recommends soil.borings to further define the'lateral extent of the contamination and <br /> a monitoring well to determine if groundwater has been impacted. <br /> C3 <br /> 7 <br /> rt <br />