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Conclusions and Recommendations <br /> 1 Sample analysis of the three monitoring wells and show that contaminants were detected <br /> (highly degraded TPHD which did not match the diesel standard) only in MW-3. <br /> Previous quarterly monitoring program data for TPHG, TPHD and BTEX and MTBE and <br /> oxygenates has shown concentrations continue to show very low, stable and/or none <br /> detected levels. The source has been removed and only very low concentrations of <br /> residual degraded dissolved contaminants are observed at MW-3. On the basis of this <br /> data it is Wright's opinion and we recommend that this site is a candidate for site closure <br /> on the basis of the site investigation and four quarters of groundwater monitoring. <br /> Limitations <br /> This report has been prepared specifically for M&M Builders site at 8111 West Eleventh <br /> Street in Tracy, CA and was done according to the State and local agency suggested <br /> guidance documents for these investigations. The interpretations, conclusions and <br /> recommendations made herein are based on professional judgment of the data and <br /> analysis for the soil and water samples collected on-site and should be reviewed in the <br /> context of this report and other site reports. Wright Environmental Services, Inc. is not <br /> responsible for errors in laboratory analysis and reporting, or for information not available <br />' during the course of the study, and no warranty or guarantee is expressed or implied <br /> therein. <br /> If you have any questions,please call. <br /> D QFD <br /> Sincerely, <br /> Environmental Services Inc. _Y� 4Q�tER <br /> Wright N21262 " # <br /> CE—ED <br /> J hn Lynch Christopher M. Palmer �l GEOLGGIST <br /> President HG 246, CEG 1262C" <br /> r�C" <br /> Attachments: Table 1. Groundwater Well Water Levels <br /> Table 2. Groundwater Chemical Data, March 2002 <br /> Table 3. Off-site Water Well Chemical Data,April 2002 <br /> Table 4. Historic Groundwater Data for Monitoring Wells <br /> Table 5. Historic Groundwater Data for Off-site Water Well <br /> Figure 1. Monitoring Well Locations; Groundwater Contour <br /> Map, June 21, 2002 <br /> r� Figure 2. Groundwater Monitoring Well Sample Data, <br /> Qom-! June 21, 2002 <br /> Page 3 <br />