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23 December 1998 <br /> AGE-NC Protect No 96-0235 <br />' Page 5 of 7 <br /> the remaining wells, screened above 40 feet bsg, Indicate a very low gradient at the site The inferred <br />' ground water flow direction and gradient in the lower Interval is similar to the prevailing historical <br /> flow direction and gradient observed at the site Ground water elevation contours based upon wells <br />' MWA, MW-2, MW-6B and MW-8B are illustrated on Figure 3 Ground water elevations for the <br /> remaining wells are posted on the figure, but were not used for gradient determination <br />' 3 2 , ANALYTICAL RESULTS OF WATER SAMPLES <br />' TPH-g was detected in MW-1 and MW-2 at concentrations of 24,000 parts per billion(ppb, reported <br /> as micrograms per liter) and 47,000 ppb, respectively Benzene was detectedan the same wells at <br /> concentrations of 5,200 ppb and 5,100 ppb, respectively Toluene, ethylbenzene, and xylenes were <br />' detected in the same wells at concentrations ranging from 230 ppb to 7,700 ppb Benzene and <br /> xylenes were detected in MW-6B at concentrations of 0 69 ppb and 0 56 ppb, respectively TPH-g, <br /> benzene, ethylbenzene and xylenes were detected in MW-7 at concentrations of 220 ppb, 43 ppb, <br /> 4 2 ppb and 2 6 ppb, respectively Benzene was detected in MW-8B at a concentration of 0 92 ppb <br /> TPH-d was detected in MW-1, MW-2, MW-6A, MW-613, MW-7 and MW-8B at concentrations <br /> ranging from 85 ppb to 4,600 ppb Petroleum hydrocarbons were not detected in the samples <br /> collected from MW-3, MW-4, MW-5 or MW-8A <br />' Tertiary butanol was detected in MWA, MW-2, and MW-6B at concentrations of 22 ppb, 31 ppb <br /> and 9 3 ppb,respectively Oxygenated compounds were not detected in remaining samples collected <br /> from the site during the August 1998 monitoring event Analytical results of all water samples <br />' collected at the site are summarized on Tables 3 and 4 The laboratory report (MAI Sample Nos <br /> 94480 through 94489), chain-of-custody forms and QA/QC are included in Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' Based on the data collected from the site, AGE finds <br /> s ry <br />' Benzene and toluene were detected in the soil sample collected from a deptho 45 feet}in <br /> boring MW-8 Petroleum hydrocarbons were not detected in the remaining samples ana yzed <br /> Organa or was not detected in any of the soil samples collected during the installation <br /> of MW-6, MW-7 of MW-8 <br /> • BTEX were previously detected in the sample collected from a depth of 31 5 feet in boring <br />' MW-2 at concentrations ranging from 0 02 to 0 20 ppm Petroleum hydrocarbons were not <br /> detected at the reporting limit of 0 005 ppm In the soil sample collected from the same depth <br /> . in boring MW-7, located approximately 4 feet west of MW-2 <br />' Advanced GeoEn%tronmental,Inc <br /> z <br />