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. Table 2. Groundwater Chemical Analytical Data, con't. <br /> Well Date TPHG Benzene Toluene Ethylbenzene Xylene MBTE <br /> NoSampled -----------------------------u g/I------------------------------ <br /> T-2 10/11/93 ND ND ND ND ND NA <br /> T-2 3/28/96 ND ND ND ND ND NA <br /> T-2 6/27/96 ND ND ND ND ND NA <br /> T-2 9/23/96 ND ND ND ND ND NA <br /> T-2 12/19/96 ND ND ND ND ND ND <br /> T-3 1/17/88 NA 00532 ND ND ND NA <br /> T-3 3/26/93 ND ND ND ND ND NA <br /> T-3 2/18/93 ND ND ND ND ND NA <br /> T-3 6/10/93 ND ND ND ND ND NA <br /> T-3 10/11/93 ND ND ND ND ND NA <br /> T-3 3/28/96 ND ND ND ND ND NA <br /> T-3 6/27/96 ND ND ND ND ND NA <br /> T-3 9/23/96 ND ND ND ND ND NA <br /> T-3 12/19/96 ND ND ND ND ND ND <br /> BLANK 12/19/96 ND ND ND ND ND ND <br /> ND- None detected NA - Not Analyzed ug/I - micrograms per liter <br /> All Resna data from 1/17/88 to 10/11/93 <br /> Discussion <br /> Contaminants were not detected in any well during this sampling event A relatively slow <br /> groundwater movement is inferred from the groundwater measurement data Overall site <br /> groundwater movement is to the north and consistent with historic groundwater flow mapping <br /> This chemical data indicates in our opinion, that dissolved contaminants have not migrated from <br /> the immediate area of the former tank excavation <br /> Conclusions and Recommendations <br /> The continuation of quarterly groundwater monitoring program is scheduled pending the PHS- <br /> EHD review of the source removal excavation report of the tank area <br /> Limitations <br /> This report has been prepared for the specifically for the Tracy Public School Bus Facility site, <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 soil and water samples collected on-site and should be reviewed in <br /> Tracy High Project No 4729 Page 3 <br />