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_ HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing,Design and Operation <br /> REPORT <br /> ADDITIONAL SUBSURFACE INVESTIGATION <br /> at <br /> Former Beacon Station No 419 <br /> I2350 Waterloo Road <br /> Stockton, California <br /> For Ultramar Inc <br />' INTRODUCTION <br /> At the request of Ultramar Inc (Ultramar), Horizon Environmental Inc (Horizon) conducted <br /> an additional subsurface investigation at Beacon Station No 419 at 2350 Waterloo Road in <br /> Stockton, California (Figure 1) This additional subsurface investigation included drilling <br /> six soil borings, installing four groundwater monitoring wells, two soil vapor extraction <br /> wells, and one air-sparging well, collecting soil samples from the soil borings, c'eveloping <br /> the five new wells, and collecting groundwater samples from the five new wells and one soil <br /> boring The purpose of this investigation was to delineate gasoline hydrocarbons in soil and <br /> groundwater beneath the site The work was performed as outlined in Horizon's Work Plan <br /> For An Additional Subsurface Invests ation (September 30, 1997), Letter Amendment to <br /> Work Plan (April 16, 1998), and Revised Amendment To Work Plan (May 22, 1998) <br /> 1 <br /> SITE DESCRIPTION AND BACKGROUND <br /> The site is an operating gasoline service station located on the southwestern corner of the <br /> intersection of Waterloo Road and Sierra Lane in Stockton, California Site facilities include <br /> 5011 Golden Foothill Parkway Suite 7 • EI Dorado Hills CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> PO Box 5283 • Bakersfield CA 93388 • (805) 589-8389 • FAX (805)589-1456 <br />