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site in five years, Wright has not located any on-site SPP sources which could account for this <br /> observation <br /> Conclusions and Recommendations <br /> Groundwater flow direction was northerly under a low calculated gradient Contaminant <br /> concentrations have increased in the wells MW-3 and MW-9, and thin SPP was observed In <br /> these wells In our opinion, the mapped contaminant plume appears stable in the center of the <br /> site based upon historic observations <br /> PHS-EHD has requested additional subsurface investigation in the vicinity of the former tank <br /> locations and Well MW-9 Wright has completed the field portion of this investigation <br /> including, a ground penetrating radar survey, and subsurface soil and groundwater sampling <br /> Wright will prepare an investigation report and forward it to the PHS EHD The site I s <br /> scheduled for continued quarterly monitoring at this time <br /> Limitations <br /> This report has been prepared specifically for the Mr Ed's Muffler (Cox and Cox) Site at 595 E <br /> 11th Street in Tracy, and was done according to the current State and local agency suggested <br /> guidance documents for these investigations The interpretations, conclusions and <br /> recommendations made herein are based on the data and analysis for the soil and water samples <br /> collected on-site and should be reviewed in the context of this report and other site reports <br /> Please note that reports of contamination must be submitted to the agencies in a timely manner <br /> Wright Environmental Services, Inc is not responsible for errors in laboratory analysis and <br /> reporting, nor for information not available during the course of the study, and no warranty or <br /> guarantee is expressed or implied therein if you have any questions concerning this report, <br /> please call <br /> Sincerely, <br /> Wright Environmental Services, Inc. <br /> N2 1262 <br /> CERTIFiED <br /> John Lynch Christopher M Palmer '� �,� CZH CCIST <br /> Principal C E G 1262, HIS 246 <br /> Attachments: Table 1 Historic Groundwater Levels and Contaminants <br /> Figure 1 Groundwater Contour Map, April 24, 2001 <br /> Figure 2 Groundwater TPHG Plume Map, April 24, 2001 <br /> Figure 3 Groundwater Benzene Plume Map, April 24, 2001 <br /> Groundwater Sampling Information Sheets <br /> Chemical Analytical Data and Cham-of-Custody Forms <br /> Page 3 <br />