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Project 06020.01 June 11, 1991 <br /> INTRODUCTION <br /> V <br /> At the request of Ultramar Inc. (Ultramar), EVAX Technologies performed a <br /> limited Soil Gas Survey and Performance Test in the vicinity of the <br /> former underground fuel storage tank complex at the subject site. This <br /> report presents a description of the investigation procedures, the <br /> results of the Survey and Performance Test, an interpretation of the <br /> results, and conclusions and recommendations based on these findings. <br /> BACKGROUND <br /> The subject site is operating Beacon Station No. 641 located at 1210 East <br /> Hammer Lane in Stockton, California. The subject site contains 4-10,000 <br /> gallon underground fuel storage tanks (UST) . The depth to groundwater is <br /> at the subject site is not known. <br /> PURPOSE AND SCOPE <br /> rr <br /> The objectives of this investigation were to 1) determine if any <br /> hydrocarbons have impacted the backfill and native soil in the vicinity <br /> of the underground storage tank system and 2) evaluate the feasibility of <br /> using vapor extraction for soil remediation at the subject site. These <br /> objectives were met through the completion of a limited Soil Gas Survey <br /> ti. and a limited 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 /> w <br /> PROCEDURES <br /> Limited Soil Gas Survey <br /> The Soil Gas Survey was conducted on June 4, 1991 at the subject site. <br />�• Seven temporary vapor probes were installed for the investigation. <br /> Placement of the temporary vapor probes was determined in the field by <br /> the site investigator. Soil gases were analyzed for total volatile <br /> hydrocarbons (TVH) during the Soil Gas Survey to screen for the presence <br /> of hydrocarbon vapor and, if found, delineate the extent of TVH impacted <br /> backfill in the vicinity of the underground storage tank complex. <br /> The temporary vapor probes installed for the investigation were <br /> constructed of 1/2-inch diameter schedule 40 steel pipe. A point was <br /> forged on one end of each probe. A 36-inch range of 3/16-inch <br /> - 1 - <br />