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vr Conclusions and Recommendations Groundwater flow direction was northerly under a low calculated gradient In our opinion,the mapped contaminant dissolved plume continues to occur near the center of the site similar to historic observations The TPHG levels fluctuated in wells,with an increase in MW-3 and MW-9 and a decrease in MW-2 Wright is completing a corrective action plan with a recommended cleanup approach for submittal to the PHS EHD for their review The site is scheduled for continued quarterly monitoring at this time Limitations This report has been prepared specifically for the Mr Ed's Muffler (Cox and Cox) 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, or for information not available during the course of the study, and no warranty orguarantee is expressed or implied therein If you have any questions concerning this report,please call Sincerely, Wr ht Environmental Services, Inc ��j �S` Pq!✓d� f _ Q__ h;° ,262 p L}1 C��tT1FiED . Jo Lvnch Christopher M Palmer E;'Cf` C Principal C E G 1262 HG 246 ,E Cc�rLCC,ST Attachments Table 1 Historic Groundwater Levels and Contaminants Figure I Groundwater Contour Map December 23, 2002 Figure 2 Groundwater TPHG Plume Map, December 23,2002 Figure 3 Groundwater Benzene Plume Map December 23 2002 Fi_ure 4 Groundwater MTBE Plume Map December 23 2002 Groundwater Sampling Information Sheets Chemical Analytical Data and Chain-of-Custody Forms I i I Page 3