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A I <br /> 4 <br /> I <br /> ol" <br /> l u I r <br /> i 20 August 2001 <br /> v AGE-NC Project No 99.0520 < <br /> Page 3 of 4 <br /> The ground water flow direction and gradient were determined�from the ground water elevation data <br /> Contours of the ground water elevation data indicates that the ground water flow was,directed toward , <br /> the northeast from the former UST area. The ground water gradient on site was calculated to be,- <br /> I0 002 under the'former UST Figure 3 illustrates the contoured ground water elevations <br /> 3 2 HYDROCARBON-IMPACTED GROUND WATER <br /> TPH-d was detected in ground water sample collected from well MW-5 at a reported concentration <br />'I of 110 micrograms per liter(/,zg/1) MTBE was detected in the ground water samples collected from <br /> well MW-1 at a reported concentrations of 4 9 ug/l There were no reported'detections of BTEX, <br /> TPH-g,DIPE,ETBE, TAME, TBA, ethanol, methanol or lead scavengers in any of the ground water <br /> samples analyzed <br /> Analytical results from ground water samples are summanzed in Table 2 The laboratory reports <br /> (MAI Laboratory ID 62508-62512,quality assurance and quality control (QA/QC)reports and chain- <br /> of-custody forms are included in Appendix B <br /> lie t <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IThe following conclusions were drawn from the results of this investigation ` <br /> The ground water flow direction in IMarclf 2001 at the site was toward the northeast <br /> • ,TPH-d was detected in the ground water sample collected from ground water monitoring j <br /> well MW-5 at a concentration of 110/.zg/l A A <br /> • SMTBE was detected in one of five ground water samples collected from the monitoring wells f <br /> on the site ata relatively low concentration of 4 9 4g/1 Additionally the concentration of ' <br />�s MTBE detected is significantly less than less than the State of California - Department of <br /> Health Services primary maximum contaminant level (MCL) of 13 ug/1 <br /> A <br /> I <br /> During the ground water monitoring program (February 2000 to March 200 1) there were no <br /> reported detections of BTEX, TPH-g,DIPE,ETBE,TAME,TBA,ethanol,methanol,or other <br /> r fuel additives in any of the ground water samples analyzed <br /> I <br /> I A <br /> I <br /> 7 I <br /> t I <br /> N _\ <br /> I <br /> 1 <br /> t I AI <br /> li 1 <br /> I <br /> i p ' <br />