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/ Contaminants were observed in the Wells MWA, MW-2, MW-3, MW-6 and MW-9 Contaminant concentrations increased sharply in Wells MW-3 and MW-9 These two monitoring wells have historically shown the most elevated concentrations on the site A small "prism" of absorbed contaminants are interpreted to reside around Well MW-9 The sampler noted stains in the casing and blebs of free product in Well MW-9, staining and product blebs have not been observed previously in MW-9 it is not currently known whether MW-9 was vandalized Conclusions and Recommendations Groundwater flow direction was northerly under a low calculated gradient In our opinion, the mapped contaminant plume appears stable in the center of the site based upon historic observations The overall historic site trend appears to be a fluctuating slow concentration decline PHS-EHD has requested additional subsurface investigation in the vicinity of the former tank locations and Well MW-9 Wright has prepared a workplan which the PHS-EHD has approved Wright is awaiting approval of the budgets for this 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 11th 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 this report, please call Sincerely, ,` �E Q SFO Wright Environmental Services, Inc. �S �Qt1ER �p N21262 CERTIFIED Joh Lynch Christopher M Palmer Principal C E G 1262, HG 246 GEOLOGIST Attachments Table 2 Historic Groundwater Levels and Contaminants Figure 1 Groundwater Contour Map, October 17, 2000 Figure 2 Groundwater TPHG Plume Map, October 17, 2000 Figure 3 Groundwater Benzene Plume Map, October 17, 2000 Groundwater Sampling Information Sheets Chemical Analytical Data and Chain-of-Custody Form • Page 3