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i <br /> Conclusions and Recommendations <br /> Sample analysis of the three monitoring wells showed that contaminants were detected <br /> (highly degraded TPHD which did not match the laboratory diesel standard) only in MW- <br /> 3. Previous quarterly monitoring program data for TPHG, and BTEX and MTBE and <br /> oxygenates has shown concentrations continue at none detected levels except highly <br /> degraded TPHD at MW-3. Contaminants were not detected in the downgradient wells. <br /> On the basis of this data it is Wright's opinion that further monitoring is not warranted <br /> and we recommend that this site is a candidate for site closure on the basis of the site <br /> investigation and five 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, Inca 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. qE 0 Q <br /> �OQ�ER h1 <br /> Sincerely, VY <br /> Wright Environmental Services, Inc. N-1 1262 <br /> CERTIFIED <br /> r <br /> FIGI 'I;G <br /> s GEOLOGIST <br /> Jo Lynch Christopher M. Palmer ' <br /> President HG 246, CEG 1262 a4.. <br /> Attachments: Table 1. Groundwater Well Water Levels, September 2002 <br /> Table 2. Groundwater Chemical Data, September 2002 <br /> Table 3. Historic Groundwater Chemical Data. September 2002 <br /> Tabie 4. historic Groundwater lata for 'Nater Well <br /> Figure 1. Monitoring Well Locations: Groundwater Contour Map, <br /> Sept. 30, 2002 <br /> _ -� re 2. �rc,�n&vater NJOV..tor ra 'Naple Data, <br /> il Sam <br /> 1 <br /> i <br />