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. site biodegradation processes It is possible that some contaminant desorbtion will continue, however the dissolved plume movement situation is not interpreted to substantially change from that previous observed in Well MW-1 data A 2,000-foot well search showed that there are no pumping wells locations within the search radius, which could intercept the site plume A further water quality impact beyond that discussed above is not envisioned from the existing M & M Automotive plume A threat from dies plume to health and beneficial use should not occur since, there is not a well used on-site, the drinking water is supplied by the City of Tracy, the source is removed, and the source area is capped by concrete pavement to prevent leaching residual contarrunants to groundwater Conclusions and Recommendations Wright has completed the excavation of contaminated sort in the vicinity of the former underground tank pit source and well MW-1 Contaminant mass estimates indicate that very low levels, relatively immobile residual hydrocarbon contaminants remain m the former tank pit vicinity Very low concentrations of VOC were occasionally observed at MW-2 and MW-3 However, these contaminants are typical of a dry cleaner source and occur in upgradient well MW-2, and are interpreted from an off-site source, and not arising from on-site source • In our opinion, further work is not warranted at this time Wright recommends that this site be considered for site closure by PHS-EBD as outlined in their October 23, 2000 letter Limitations Thus report has been prepared specifically for the M& M site at 60 E 10th Street, 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 water samples collected-on-site and should be reviewed in the context of the whole report Please note that reports of contamination must be submitted to the agencies in a timely manner Wright Environmental Services, Inc isnot responsible for-errors in previous consultants, contractors, or regulatory agencies files or information, nor for laboratory analysis and reporting, or for information withheld during the -course-0f the study, and no warranty or guarantee is expressed or implied therein Page 8