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r <br /> ' 07 June 2006 <br /> AGE-NC Project No 97-0351 <br /> Page 3 of 4 <br /> ' shallow ground water conditions <br /> Ground water near the former west UST location was inferred to be flowing outward from ground <br /> water ridge near wells MW-2 and MWA under a calculated hydraulic gradient of approximately <br /> 0 005 foot/foot (ft/ft) Ground water near the former east UST location was inferred to be flowing <br /> inward toward a depression in the potentiometric surface near well MW-7 or generally southwest <br /> ' under hydraulic gradients between 0 007 ft/ft and 0 017 ft/ft Figure 3 illustrates the contoured <br /> ground water elevations as measured on 07 April 2006 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the ground water samples collected from wells MW-1 and MW-8 at <br /> concentrations of 2,200 micrograms per liter(µg/1)and 4,100 µg11,respectively BTEX compounds <br /> were also detected in wells MW-1 and MW-8 at the following maximum concentrations in well <br /> ' MW-8 47 µg/1 benzene, 31 pg/1 toluene, 48 µg/1 ethylbenzene, and 147 gg/1 total xylenes <br /> No other petroleum hydrocarbons were detected in the ground water samples analyzed Analytical <br /> ' ! results of Wound water samples are summarized in Table 2 The laboratory report(CTEL Project No <br /> C 1214.0604043) quality assurance/quality control (QA/QC) report and chain of custody form are <br /> included in Appendix D <br /> ' 40 SUMMARY AND CONCLUSIONS <br /> Rased on the cnN ironmcntal data collected at the Lite during the second quarter 2006, AGI <br /> ' concludes <br /> • On 07 Apiil 2006 depths to ground N,�attr ranged from 5 77 FLLt to 6 85 1CLt bLIO%,v the tops <br /> ' of the \bell casings Ground water cleNation at the site ranged from 2 62 tett to 3 73 feel <br /> above MSI and d\Lraged appro,,innately 3 39 feet aboNc MSI indicating an increase in <br /> LILN anon oC apprommatek 0 02 feet since the last ground NNater monitoring c\cnt in <br /> ' January 2006 <br /> • Ground "atcr ricai the. former \\est tiS I location ,,Nas inferred to he floNAing out��ard Iiorn <br /> ' ground water ridge near \�clls \4W-2 and VIV1k-4 under a talinulattd hydraulic gradient of <br /> approximately 0 005 JiJit Crround \tinter [I Lar tht f()rnnLI caLt t I'-, I location 1AaL iT7ter1Ld to <br /> bL floNking imNard to"aid a dLpreLLitin in the. potcntiOrrictrn LurlX-L near \4e11 \,IW 7 of <br /> gc11eia1l} Louth to Louthv�eLt under 11�diau11e gradients bONvLc-,­1 0 007 ftllt and 0 0' 1 it It <br /> i <br />