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J. H. KLEINFELDER & ASSOCIATES File No. W-2030-1 September 25 , 1986 SOIL SAMPLING INVESTIGATION REPORT UNION CARBIDE AGRICULTURAL RESEARCH STATION 10144 EAST FRENCH CAMP ROAD MANTECA, CALIFORNIA I . INTRODUCTION The following report summarizes the soil sampling investigation performed at the Union Carbide Agricultural Research Station located at 10144 East French Camp Road in Manteca, California. Union Carbide contracted J. H. Kleinfelder & Associates (JHK&A) to perform a site investigation to assess the presence of aromatic hydrocarbons and selected pesticides in soil beneath an existing rinsewater storage tank. This investigation was performed in accordance with a plan of study developed in concert with the San Joaquin Local Health District . This report describes the work elements associated with our field invest=gaz:c= and presents t*ne findings and conclusions drawn from the investigative results. II . BACKGROUND The Union Carbide facility is located at 10144 East French Camp Road in the City of Manteca, as shown on Plate No. 1 . It is the understanding of J. H. Kleinfelder & Associates that a single underground storage tank that once contained wash water from the cleaning of pesticide herbicide application machinery has been drained and is no longer in service. This tank lies beneath a building and removal would be impractical. Therefore in-place abandonment is being considered by Union Carbide. III . PURPOSE _ Union Carbide contracted J. H. Kleinfelder & Associates to perform a soil sampling investigation to assess whether aromatic hydrocarbon carriers or selected pesticides are present in the soil beneath the empty tank so that in-place tank abandonment can be instituted. The scope of work included: • The drilling of two angled soil borings beneath the tank.