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�� z3 • The presence of petroleum product in MW-3 and MW-9 has not caused a concurrent large rise in BTEX volatile content,that in our opinion indicates the dissolved plume of degraded fuel is relatively depleted in dissolved volatile constituents (see Figures 2, 3 and 4) The elevated dissolved data from MW-3 and MW-9 may be in part attributed to analysis of a water sample collected from a well containing sheen to minor separate phase product Previous experience has shown that such a sample will tend to show very high dissolved contaminants due to the presence of the product in that well The interpreted location of the dissolved plume based on the historic groundwater flow and interpreted contour information continues to show essentially no net plume movement beyond the area immediately around Wells MW-3 and MW-9 Conclusions and Recommendations Groundwater flow direction was northerly under a low calculated gradient and water levels in monitoring wells had declined about 0 75 feet since the previous quarter In our opinion, the mapped contaminant dissolved plume continues to occur near the center of the site, similar to historic site observations and previous investigation reports submitted to PHS E14D Thin layers of separate phase product occurred in MW-3 and MW-9 The TPHG levels fluctuated in wells, with an increase in MW-3 and MW-9 Wright has completed and submitted an interum remedial action plan TRAP (targeted m the vicinity of MW-3 and MW-9) subsequent to PHS EHD review of the CAP Wright has discussed the IRAP interum cleanup approach for submittal for PHS EHD review The site is scheduled for continued quarterly monitoring at this time The detection of a contaminant in the equipment blank indicates a review of sampler decontamination procedures is needed Wright discussed the data with the contract sampler who assured Wnght new disposable bailers were used Wright requested the sampler to confirm all protective wrappers are intact prior to sampling in the future 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 m 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 or guarantee is expressed or implied therein If you have any questions concerning this report, please call Sincerely, Wright Environmental Services, Inc o��N ,; O HN2 1262 ohn Lynch Christopher M Palmer CERMED i Principal C E G 1262, HG 246 Ell.&LIECF,ANG sa HOLOUST Ca- CAS • Page 3