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q6 City of Stockton A68104 01A <br /> October 25, 1995 Page 7 <br /> 5.4 Groundwater Sample Analytical Results A summary of groundwater sample analytical <br /> results for samples collected from monitoring well MW-1 are presented in Table 3. <br /> Laboratory analysis reports and chain-of-custody documentation are presented in Appendix <br /> C <br /> TABLE 3 <br /> Summary of Groundwater Sample Analytical Results <br /> Monitoring Well MW-1 <br /> Sampling Date B T E x TAH-G <br /> j g/L jug/L ug/L ug/L µg/L <br /> 06/30/95 ND ND ND ND ND <br /> 09/26/95 ND ND ND ND ND <br /> DLR 05 05 05 05 50 <br /> µg/L = micrograms per liter <br /> BTEX = benzene, toluene,ethylbenzene,xylenes <br /> TPH-G = total petroleum hydrocarbons-gasoline range <br /> ND = Not detected at or above detection limit for reporting purposes <br /> DLR = Detection limits for reporting purposes <br /> 6.0 EVALUATION <br /> Soil and groundwater sample analytical results were evaluated to assess the extent of PPC <br /> migration In addition, the data were evaluated to assess potential environmental effects <br /> of PPC migration <br /> 6.1 Extent of PPC Migration in Soil During the previous work, PPCs were detected in <br />' soil samples collected at 19 5 feet BSG at the bottom of an excavation However, PPCs <br /> were not detected in soil samples collected at 20 and 25 feet BSG in the soil boring for <br /> monitoring well MW-1 drilled below the former UST location This data suggests that PPC <br /> migration from the release did not extend vertically to 20 feet BSG <br /> The soil sample analytical results from soil borings B-2 and B-3 were non-detect for the <br /> selected PPCs This data suggest that the lateral extent of PPC migration from the release <br /> did not exceed approximately 10 feet (the approximate distance from the former UST <br /> location to the nearest soil sample collection location at 15 feet BSG in soil boring B-3) <br /> The soil sample analytical results from soil boring B-1 were non-detect for the selected <br /> PPCs This data suggest that there was no release of PPCs at the former dispenser location <br /> 6.2 Potential Environmental Effects The potential environmental effects of concern <br /> would be the migration of PPCs from the impacted soil into groundwater The analytical <br /> results of groundwater samples collected from monitoring well MW-1 in June and <br />