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i, <br /> OIfARTEHLY,,.NOWATER"r"3F1NG PEPORr <br /> .20 West Kerlemoo"re,Lta,Caldomm <br /> !,p INTRODUCTION <br /> documents the results of the fourth quarterly groundwater monitoring <br /> This report d Ae is <br /> on October 17, 1991, at the Shell Oil <br /> conducted by Aegis Environmental, Inc. ( 9 ) <br /> California <br /> flection of depths-to-groundwater measurements <br /> Company (Shell) service station located at 420 West 4Cettleman Lane in Lodi, <br /> p included This <br /> (Figure 1)• Them MW-2 and MW-3, on site (Figure 2). <br /> and water samples from the three wells, MW-1 Aegis from Shell, and is subject to <br /> report is based, in part, on information obtain <br /> edwarrant <br /> modification as newly acquired information may <br /> 2.0SITE DESCR{PTIOh! <br /> Lane Shell service station is an active site that is located in a cls lommerc ad.l <br /> The West Kettle La is in a <br /> regular-unleaded, and premium unleaded gasoiines- Thee e <br /> Report March 26, 1991), and <br /> --- area of Lodi. Details of the site's current facilities were reported to Shell by eg <br /> ,Site Assessment-MonitoringAS es5nmentaResuon 'lltts Reportesults ," (October ;6, 1989)- <br /> ,Pre-Tank Replacement Site <br /> w 3.0 BACKGROUND <br /> ults <br /> en soil borings were drilled and sampled at repsite.Theebor ngs <br /> In September 1989,were <br /> reported to Shell in the October 16, 1989, p les collected <br /> of the investigation were rep tanks, at <br /> in depth from 11?h to 21-'/z feet below surface.sting underground storage from <br /> ranged p e of the xylenes ranging <br /> from one boring along the south edge <br /> les from the remaining <br /> 15 feet below surface, indicated con pm). Analysisfof the otoluene ansamp l xy storage tanks <br /> 0.003 to 0.012 parts-per-million (ppm). <br /> dispenser islands and underground Iben g ne and <br /> borings adjacent to the existing PH and benzere> toluene, ,"thy <br /> indicated total petroleum hydrocarbons (TPH) Concentrations of toluene at <br /> gTEX} were below detection limits (6DL). quadrant <br /> total xylenes ( approximately 5 feet below surface in the northwest <br /> C).004 ppm were detected at app proposed tank basin. However, analysisroadrantl <br /> of the site in the location of the formerly prop in the northwest q <br /> sample, collected at 10 feet below06s�ppm from one boring <br /> inedicated TPH, as gasoline, at wells <br /> Se tember 1990, Aegtis installed and sampled the three groundwater monitoring <br /> In p <br /> at the site. <br />