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■ Geotechnical Inc <br /> a� <br /> o� <br /> April 28,2006 <br /> Kimball Hill Homes <br /> Attention: Dudley McGee <br /> 9355 East Stockton Boulevard, Suite 100 <br /> Elk Grove, CA 95624 <br /> SUBSURFACE INVESTIGATION AND <br /> PRELIMINARY REMEDIATION PLAN <br /> AREA OF FORMER UNDERGROUND STORAGE TANK <br /> CABRAL—Me ADAMS PROPERTY <br /> APN 115-230-06 <br /> 4204 North Sutter Street <br /> Stockton, California <br /> Raney Reference No. 1828-092.01 <br /> INTRODUCTION <br /> In accordance with your request, we have performed a number of direct push borings and <br /> collected subsurface soil samples from the area of a former underground gasoline storage tank <br /> at the subject site for laboratory analysis. Initial subsurface soil sampling/analysis was <br /> performed in October 2005; additional sampling was performed in March 2006. The purpose of <br /> the sampling was to evaluate the extent and distribution of petroleum hydrocarbon <br /> contamination in subsurface soils at this location. This report presents descriptions of our <br /> sampling activities and the laboratory results. Based on the data obtained to date, it would- <br /> appear that remedial excavation of affected soils is warranted. Preliminary remedial <br /> recommendations are presented herein; final remedial procedures can be established following <br /> discussions with the appropriate regulatory agency. <br /> A Vicinity Map showing the location of the subject property is presented on Plate 1. A Plot <br /> Plan showing the general layout of the underground tank area and our boring locations is <br /> presented as Plate 2. A summary of the soil analytical data is presented on Table I. Copies of <br /> the laboratory reports and chain-of-custody documentation are appended. <br /> 3140 BEACON BLVD.-WEST SACRAMENTO,CA 95691 -TELEPHONE 916/371-0434-FAX 916/371-1809 <br />