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IWALLACE • KUHL PRELIMINARY INVESTIGATION AND EVALUATION REPORT <br /> I:r ASSOCIATES INC <br /> 26485 NORTH THORNTON ROAD <br /> Thornton, California <br /> WKA No 2556 02 <br /> IAugust 18, 1994 <br /> INTRODUCTION <br /> IIn accordance with our workplan of October 21, 1993, we have completed the <br /> installation of three monitoring wells at the above referenced site The purpose of <br /> Iour work was to further evaluate the extent of ground water contamination in the <br /> vicinity of the two former underground storage tanks (USTs) and associated piping <br /> removed from the site on June 2, 1993 Additionally, we observed and documented <br /> the excavation of contaminated soil from the vicinity of the former USTs and <br />' associated piping <br /> c SITE DESCRIPTION <br /> IThe site is located at the northwest corner of the intersection of North Thornton and <br /> Geotechmca!Engineering <br /> 4' Walnut Grove Roads in the town of Thornton, California (Plate 1) The site <br />' Engineering Geology encompasses approximately 2 acres and consists primarily of open, grass-covered <br /> fields with several concrete pads where former buildings were located (Plate 2) The <br />' ., Environmental Consulting <br /> site once housed a small automobile service station and automotive repair shop <br /> Remediation Services <br />' Construcnon Inspection <br /> HYDROGEOLOGIC SETTING <br /> Materials Testing <br /> Physiographic and Hydro geologic Setting <br /> i <br />' 3050 Industrial Blvd The site is located in the central portion of the Great Valley geomorphic province of <br /> California The Great Valley is bounded by the mountains and foothills of the Sierra <br />' V West Sacramento <br /> � Nevada Range to the east and the California Coast Ranges to the west The geologic <br /> CA 95691 <br /> formations of the Great Valley are typified by thick sequences of alluvial sediments <br /> Fax 916 372 2565 <br /> 7 916 372 1434 <br /> 1 <br /> Recycled paper <br />