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f 011yll'INIAL 'I'ECIIN0L()UY INC. Specializing In Fnviromental Field Services Date: Ma 12, 1990 ---` Project: OTI.900501 Mr. Roland Hall ; U.S. Technical Consulting, Inc. i ' i 1414 W. Broadway Rd., Suite 150 _..--- ---------------_ Tempe, AZ 85282 Subject: Subject: Results of soil gas survey at abandoned Coca-Cola facility in Stockton, California Dear Mr. Hall: This letter presents the results of the soil gas study performed by Optimal Technology, Inc. (OTI) for U.S. Technical Consulting at the abandoned Coca-Cola facility located in Stockton, California. This work was performed on May 9th and 10h, 1990. A soil gas study was performed at this site to screen for subsurface contamination by petroleum hydrocarbons. Two tanks were removed from this site in the spring of 1990, one diesel and one gasoline. During the tank removals, gasoline contamination was observed in tho soil surrounding the gasoline tank. Subsequent soil analysis showed that small levels of benzene, toluene and xylenes were present (<1.0 mg/Kg). At the time of this study, results of the Total Petroleum Hydrocarbons (fPH) analysis were not available. - The objective of the soil gas study was to try io determine the horizontal migration of the contaminants through the subsurface and to aid U.S. Technical Consulting in the subsequent placement of soil borings and or groundwater monitoring wells. Sampling Method - : Sampling was performed by hydraulically driving steel soil gas sampling probes - to depths of 5 to 13 feet beneath ground surface. When soil conditions required, an electric hand-held rotary impact hammer drill was used to assist in probe placement. The same hammer drill was used to drill a 1.5 inch hole through the overlying concrete to allow probe placement. An electric vacuum pump was then attached to the probe and at least 5 liters of soil gas were removed prior to sample collection. Samples were obtained in gas-tight syringes - by puncturing silicon tubing connecting the sampling probe and the vacuum pump. New probes and silicon tubing were used at each sampling point to prevent cross contamination. Samples were injected into the gas chromatograph - immediately after collection. The sampling system was blanked at each sampling point prior to use by collecting a sample through the probe before emplacement. If contamination was detected, corrective actions were taken to eliminate the source and blanks were re-analyzed. 6430 Via Real,Suite #6 Carpinteria, CA 93013 Tele:(605)684.6226 • Fax:(695)684-106}