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Conclusions and Recommendations Additional exploratory bonngs and one groundwater monitoring well were used to ascertain the extent of petroleum contaminants in the vicinity of a former underground storage tank location Exploratory soil boring and groundwater sampling show that the contaminant plume occurs in and near the former tank area Contaminant distribution is indicative of limited movement, and biodegradation appears to have degraded the BTEX components in groundwater The plume appears to be primarily on-site, and has migrated slightly north of the tank The data collected in the periodic monitoring program show very low concentrations of hydrocarbons at MW-1 Biodegradation of contaminants in groundwater has occurred and is supported by the data collected in the most recent study These remaining concentrations are anticipated to decrease with time once the source and contarnmated soil have been removed In our opinion, further limited work is warranted at this time Residual soil contaminants observed occur in shallow groundwater in the immediate former tank pit area adjacent to MW-1, and inside the curb at 10th Street This groundwater contamination should greatly diminish once the source in the former tank pit is excavated and removed Quarterly monitoring would continue and if concentrations show decline for two quarters, then Wright recommends that this site be considered for closure . Limitations This report has been prepared for the specifically for the M and M Automotive site at 60 East 10th Street in Tracy, CA, and was done according to the State and local agency suggested guidance documents for these investigations The interpretations, conclusions and recommendations made herein are based on the data and analysis for the soil and water samples collected on-site and should be reviewed in the context of the whole report and previous work Please note that reports of contamination must be submitted to the agencies in a timely manner Wright Environmental Services, Inc is not responsible for errors in laboratory analysis and reporting, or for information withheld during the course of the study, and no warranty or guarantee is expressed or implied therein References Wright Environmental Services, Inc , report dated March 10, 1995, entitled, "Environmental Assessment Report M & M Automotive, 60 East 10th Street, Tracy, California," Project No 4070T, 5 pages with attachments Wright Environmental Services, Inc , report dated April 29, 1996 entitled, "Soil and Groundwater Problem Assessment Report and Proposed Source Removal and Monitoring, M & M IsAutomotive, 60 East 10th Street Tracy, CA," Project No 4070-T, 7 pg with attachments