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Project 02260.01 November 20, 1990 <br /> `y INTRODUCTION <br /> At the request of Ultramar Inc. (Ultramar), a subsurface <br /> investigation was conducted at the subject site. This report presents a <br /> description of the investigation procedures, the results of the Soil Gas <br /> - Survey and Performance Test, an interpretation of the results, and <br /> conclusions based on these findings. <br /> BACKGROUND <br /> The subject site is a Beacon station located at 900 South Cherokee Lane <br /> in Lodi, California. According to information provided by Ultramar, <br /> environmental studies indicate soil and groundwater at the site are <br /> impacted by petroleum hydrocarbons. Logs of borings indicate that the <br /> " subject site is underlain by intercalated sands and silts. Ultramar <br /> reports that in December 1989 the depth to groundwater was at <br /> approximately 50 feet below grade. <br /> PURPOSE AND SCOPE <br /> The objectives of this investigation were to 1) define the extent of <br /> z hydrocarbons in the sail and determine the areas of highest <br /> concentrations of hydrocarbon vapors and 2) evaluate the feasibility of <br /> using vacuum extraction for soil remediation at the subject site. These <br /> objectives were met through the completion of a Soil Gas Survey and <br /> Performance Test. <br /> All data collected in this investigation are considered confidential and <br /> will not be released to a third party without the written consent of an <br /> authorized representative of Ultramar. <br /> PROCEDURES <br /> Soil Gas Survey <br /> The Soil Gas Survey was conducted November 6 and 7, 1990 at the subject <br /> site. Eight temporary vacuum probes were installed and fourteen existing <br /> groundwater monitoring wells were used for the investigation. Placement <br /> of the-_temporary_vacuum_probes-_was determined_in the fi..el_d .by_-t.he site_ <br /> ------ ------- <br /> investigator and project engineer (Figure 1). Soil gases were analyzed <br /> for total volatile hydrocarbons (TVH) during the Soil Gas Survey to .l) <br /> screen for the presence of hydrocarbon vapor and 2) delineate the extent <br /> of TVH impacted soil at the subject site. <br /> - 1 - <br />