Laserfiche WebLink
1 F _ <br />' 18 January 2004 <br /> . AGE-NC Project No 95-0141 <br /> Page 3 of 5 <br /> Wells MW-3, MW-5,MW-7,MW-8A through MW-12A and EX-1 were used to determine ground <br /> water flow direction and gradient for shallow ground water The shallow ground water was Inferred <br /> to flow generally toward the east-southeast, at a gradient of 0 001 foot/foot Figure 3 Illustrates the <br /> contoured shallow ground water elevations as measured on 24 September 2003 <br /> Wells MW-6 and MW-8B through MW-12B were used to determine ground water flow direction <br />' and gradient for the deep ground water zone The deep ground water was Inferred to flow generally <br /> toward the southeast, at a gradient of 0 02 foot/foot Figure 4 illustrates the contoured deep ground <br /> water elevations as measured on 24 September 2003 <br /> • 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br />' The analytical results of the ground water samples were as follows <br /> • TPH-g was detected in ground water samples collected from wells MW-3,MW-6, MW-8B, <br /> MW-9B and EX-1 at concentrations ranging from 320 gg/l in MW-9B to 130,000 µg/1 in <br /> EX-1 <br />'. BTEX compounds were detected In samples MW-3, MW-6, MW-8B and EX-1 at <br /> concentrations as high as 5,000 gg/l of benzene, 23,000 µg/1 of toluene, 2,400 gg/1 of <br /> ethylbenzene and 11,000 gg/I of xylenes These high concentrations were all from well EX-1 <br />' 1,2-DCA was detected in ground water samples collected from all wells except MW-I OA/B, <br /> MW-11A and MW-12A/B 1,2-DCA was detected at concentrations ranging from 2 4 gg/l <br /> (MW-9A) to 190 gg/l (EX-1) <br /> The areal extent of TPH-g- and 1,2-DCA-Impacted shallow and deep ground water is Illustrated on <br />' Figures 5 and 6,respectively Laboratory results of water samples analyzed are summarized in Tables <br /> 2 through 5 The laboratory reports for the quarterly monitoring event (CTEL Laboratory IDs <br /> 0309-158-1 through 0309-158-15), QA/QC reports and chain-of-custody form are included in <br />' Appendix C <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The findings of the third quarter 2003 site investigation event Include the following <br /> • At the time of the September 2003 ground water monitoring event, ground water elevations <br /> at the site ranged from 13 76 feet below MSL to 14 54 feet below MSL The shallow ground <br />' water was inferred to flow generally toward the east-southeast, at a gradient of 0 001 <br /> foot/foot while the deeper ground water zone was Inferred to flow generally toward the <br /> southeast,at a gradient of 0 02 foot/foot Wells MW-3 through MW-5 were"drowned",and <br />' Advanced GeoEnvi ron mental,Inc <br /> 1 <br />