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iDiscussion <br /> Groundwater flow direction appears consistent with historically observed trends The <br /> concentrations in Well MW-1 rose slightly (with a decrease in Benzene) compared to the <br /> previous quarter Well MW-4 showed very low levels of TPHG contaminants were detected for <br /> the first time in three quarters These fluctuations are attributed to residual contaminants <br /> desorbing into the groundwater from the soil strata in the immediate vicinity of the former tank <br /> pit The late winter rainfall and shallow recharge have probably contributed to desorbtion, and <br /> volatile components continue an overall declining trend Neither MTBE or fuel oxygenates were <br /> not detected in any well <br /> Conclusions and Recommendations <br /> Wright recommends that the quarterly monitoring for this site continue at quarterly intervals <br /> Limitations <br /> This report has been prepared specifically for the M & M site at 60 E 10th Street, Tracy, CA, <br /> and was done according to the State and local agency suggested guidance documents for these <br /> investigations The interpretations, conclusions and recommendations made herein are based on <br /> the data and analysis for the water samples collected on-site and should be reviewed in the <br /> l context of the whole report Please note that reports of contamination must be submitted to the <br /> agencies in a timely manner Wright Environmental Services, Inc is not responsible f o r <br /> errors in laboratory analysis and reporting, or for information withheld during the course of <br /> the study, and no warranty or guarantee is expressed or implied therein <br /> If you have any questions concerning this report, please call <br /> �,E D GFS <br /> Sincerely, <br /> Wright Environmental Services, Inc <br /> t U� N2 1262 ��i Ln� <br /> CERTIFIED <br /> E 1,G 1, E 4,,,G <br /> ohn Lynch Christopher M Palmer GEGLOGIST <br /> Principal C E G 1262, HG 246 LP <br /> C'NN' F <br /> Attachments Table 3 Historic Groundwater Chemical Data <br /> Figure 1 Site Plan and Groundwater Contour Map, March 29, 1999 <br /> Groundwater Sampling Information Sheets <br /> Chemical Analytical Data and Chain-of-Custody Forms <br />