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MITTELHAUSER <br /> � corporation <br /> 7901 Stonendge Drive,Suite 123 <br /> Pleasanton, California 94588 <br /> Bus (510) 416-2900 <br /> Fax (510) 416-0957 <br /> ' January 31, 1992 <br /> Mr. Harlin Knoll <br /> San Joaquin County Department of Public Health Services <br /> ' P.O. Box 2009 <br /> Stockton, California 95201 <br /> SUBJECT: Preliminary Investigation and Evaluation Report <br /> ' Unocal Service Station 16348 <br /> 3788 Tracy Boulevard, Tracy, California <br /> ' Dear Mr. Knoll: <br /> This report presents results of a subsurface <br /> ' investigation and installation of monitoring wells at 3788 Tracy <br /> Boulevard, Tracy, San Joaquin County, California. The site, <br /> located just north of Interstate 205, is shown on Figure 1. <br /> The purpose of the work is to assess the extent of any <br /> subsurface contamination and to identify the groundwater -'low <br /> direction. All work is performed in compliance with guidelines <br /> ' established by the California Regional Water Quality Control Board <br /> (RWQCS) , and the San Joaquin County Department of Public Health <br /> Services. The work consisted of the following tasks: <br /> ' o Coordinating with regulatory agencies and obtaining <br /> I <br /> necessary permits. <br /> ' o Preparing a health and safety plan. <br /> I <br /> o Arranging and observing installation and <br /> ' development of four groundwater monitoring wells. <br /> o Arranging and observing the drilling of additional <br /> borings to delineate the nature and volume of soil <br /> ' contamination. <br /> o Collecting soil samples during drilling and water <br /> ' samples following well development fcr laboratory <br /> analysis of contaminants of concern. <br /> o Sunnarizing findings into a Preliminary <br /> Investigation and Evaluation Report. <br /> i <br /> I <br />' ® CHICAGO, IL BAKERSFIELD, CA INDIANAPOLIS, IN LAGUNA HILLS, CA <br /> I <br />