ARCHIVED REPORTS XR0010077 - Laserfiche WebLink

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4 qN . Contaminants were observed in the Wells MW-2, MW-3, MW-6 and MW-9 Contaminants were not observed in Well MW-1 , which previously had low levels of TPHG Contaminant concentrations decreased sharply in Wells MW-3 and MW-9 These two monitoring wells have historically shown the most elevated concentrations on the site and previous fluctuations have been interpreted as local desorption from sediment near the casing The contract sampler previously noted stains in the Well MW-9 casing with blebs of free product, however staining and product blebs were not reported in MW-9 this quarter Conclusions and Recommendations Groundwater flow direction was northerly under a low calculated gradient Concentrations have declined in the wells, and contaminants were not observed in Well MW-1 In our opinion, the mapped contaminant plume appears stable in the center of the site based upon historic observations PHS-EHD has requested additional subsurface investigation in the vicinity of the former tank locations and Well MW-9 Wright has prepared and forwarded a workplan to PHS-EHD A portion of that work, a ground penetrating radar survey, was performed in January, 2001 Wright will contact the PHS-EHD regarding this recent work The site is scheduled for continued quarterly monitoring at this time Limitations i 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 lease call c Sincerely, Wright Environmental Services, Inc. �- f, X121262 CENT E r J John Lynch Christopher M Palmer Principal C E G 1262, HG 246 Attachments: Table 1 Historic Groundwater Levels and Contaminants Figure 1 Groundwater Contour Map, January 17, 2001 Figure 2 Groundwater TPHG Plume Map, January 17, 2001 Figure 3 Groundwater Benzene Plume Map, January 17, 2001 is Groundwater Sampling Information Sheets Chemical Analytical Data and Chain-of-Custody Form Page 3