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`t•`t` n' 4�'"�: . iF '.f�-� +� �r 4' .t i f+_�,4f. 1w 5'1 t d <br /> 21,`t'n: ; iw J �1. rc�r ,�,}c�` �, ' '"'+^S:"a...-r��i,sv}t 4 r 'S.yri'�.�,dG"'dl .4,,,;-"•� <br /> 1 <br /> Discussion <br /> Groundwater movement is northerly at a low flow gradient and the flow direction is consistent <br /> with historically observed trends Contaminants were observed in the Wells MW-2, MW-3, <br /> MW-6 and MW-9 Levels in MW-1 were not detected for the third consecutive sampling event <br /> MTBE and oxygenates were not observed in any well Fluctuations of observed residual <br /> contaminant concentrations are attributed to aquifer recharge and rising water levels which <br /> allow more desorption of residuals In our opinion, a highly degraded fuel and fluctuating <br /> concentrations of contaminants continue an overall declining trend The continuing occurrence <br /> of contaminants in MW-6 is currently attributed to an offsite source (presumably somewhere <br /> south across East Eleventh Street) since MW-6 is upgradient of the known on-site contaminant <br /> source This off-site plume continues to migrate onto the site at 595 11 th Street <br /> Conclusions and Recommendations <br /> Wright recommends that the groundwater monitoring wells be monitored at quarterly intervals <br /> to meet the requirements of the PHS-EHD for underground tank petroleum releases The <br /> monitoring program will be used to track contaminants The PHS-EHD is currently reviewing <br /> the site work <br /> Limitations <br /> This report has been prepared specifically for the Mr Ed's Muffler Site at 595 E 11 th Street <br /> in Tracy, and was done according to the current State and local agency suggested guidance <br /> documents for these investigations The interpretations, conclusions and recommendations made <br /> herein are based on the data and analysis for the sod and water samples collected on-site and <br /> should be reviewed in the context of this report and other site reports Please note that reports <br /> of contamination must be submitted to the agencies in a timely manner Wright Environmental <br /> Services, Inc is not responsible for errors in laboratory analysis and reporting, nor for <br /> information not available during the course of the study, and no warranty or guarantee is <br /> expressed or implied therein <br /> If you have any questions concerning this report, please call ��RE GFS <br /> Sincerely, <br /> Wright Environmental Services, Inc. t N° 1262 <br /> CERTIFIED <br /> EIRNEERING <br /> GEOLOGIST <br /> John Lynch Christopher M Palmer <br /> - _ - Principal CEG 1262, HG 246 TF OF cAUF�� -- <br /> Attachments, Figure 1 Groundwater Contour Map, January 14, 1999 <br /> Groundwater Sampling Information Sheets <br /> Chemical Analytical Data and Chain-of-Custody Form <br /> Page 6 <br />