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1 11PIP, <br /> 1 <br /> QUARTERLY GROUNDWATER MDHITOfaNG RFPOCIT <br /> 420 West Kettleman Lane,Lodi.Caldornia <br /> r,y <br /> 1.0 INTRODUCTION <br /> This report documents the results of the third quarterly groundwater monitoring <br /> conducted by Aegis Environmental, Inc. (Aegis), on July 8, 1991, at the Shell Oil <br /> Company (Shell) service station located at 420 West Kettleman Lane in Lodi, California <br /> (Figure 1). The monitoring included collection of depths-to-groundwater measurements <br /> and water samples from the three wells, MW-1, MW-2, and MW-3, located on site (f=igure <br /> " 2). This report is based, in part, on information obtained by Aegis from Shell, and is <br /> subject to modification as newly acquired information may warrant. <br /> 2.0 SITE DESCRIPTION <br /> The West Kettlemen Lane Shell service station is an active site that retails regular-leaded, <br /> regular-unleaded, and premium-unleaded gasolines. The site is located in a commercial <br /> area of Lodi. Details of the site's current facilities were reported to Shell by Aegis in a <br /> "Site Assessment-Monitoring Well Installation Results Report," (March 26, 1991),and"Pre- <br /> Tank Replacement Site Assessment Results Report," (October 16, 1989). <br /> 3.0 BACKGROUND <br /> In September 1989, fifteen sail borings were drilled and sampled at the site. The results <br /> of the investigation were reported to Shell in the October 16, 1989 report. The borings <br /> ranged in depth from 11-1h to 21-1h feet below surface. Analysis of soil samples collected <br /> from one boring along the south edge of the existing underground storage tanks, at 15 <br /> feet below surface reported, concentrations of toluene and total xylenes ranging from <br /> 0.003 to 0.012 parts-per-million (ppm). Analysis of the soil samples from the remaining <br /> borings adjacent to the existing dispenser islands and underground storage tanks <br /> indicated total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, <br /> ethylbenzene, and total xylenes (STEX) were below detection limits. Concentrations of <br /> toluene at 4.004 ppm were detected at approximately 5 feet below surface in the <br /> northwest quadrant of the site in the location of the formerly proposed tank basin. <br /> However, TPH G at 1064 ppm was reported for a sample collected at 1D feet below <br /> surface from one boring in the northwest quadrant. <br /> In September 199roundwater monitoring wells <br /> 0, Aegis installed and sampled the three g <br /> at the site. <br /> F e9-010D.RYi 1 <br />