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Conclusions and Recommendations In our opinion, the mapped contaminant plume appears stable in the center of the site, this relative plume stability on-site has been a site trend Our interpretation of these monitoring data suggest that fluctuations in groundwater levels may allow desorbtion and fluctuating observed concentrations of TPHG and Benzene The overall historic site trend appears to be a fluctuating concentration decline PHS EH© has requested additional subsurface investigation in the vicinity of MW-9 and Wright is moving forward with that work The site is scheduled for continued quarterly monitoring at this time Limitations This report has been prepared specifically for the Mr Ed's Muffler Site at 595 E 11 th Street in Tracy, and was done according to the current 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 this report and other site reports 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, nor for information not available during the course of the study, and no warranty or guarantee is expressed or implied therein If you have any questions concerning chis report, please call Sincerely /, = Wright Environmental Services, Inc J - H2 1 . G lG �r-T r -17 I John Lynch Christopher M Palmer Principal C E G 1262, HG 246 `� f Attachments Figure 1 Groundwater Contour Map, April 20, 2000 Figure 2 Groundwater TPHG Plume Map, April 20, 2000 Figure 3 Groundwater Benzene Plume Map, April 20, 2000 Groundwater Sampling Information Sheets Chemical Analytical Data and Chain-of-Custody Form cc Earl Breitstexn 16