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_ -_. .- •_ -_-'-c- .. .- . -.. Rte- ..- f Y• --:>i. <br /> 15 January 1999 ' <br /> • AGE-NC Project No. 98-0440 <br /> Page.3 of 4 ; <br /> 1998 ground water monitoring event is depicted.in Figure 3: <br /> Ground water monitoring data collected-in October 1998 in the area of MW-1 through MW=4 <br /> indicated that the ground N'Vater flo'\V direction was generally toward Elie north-northeast at a gradierit <br /> -of 0.013 ft/ft, or approximately 70 feet per mile,(Figure 3). <br /> LABORATORY RESULTS OF GROUNDWATER SAMPLES. <br />' TPH-g Was detected in the water sample collected from MW-2 in October'l998 at a concentration <br /> of 5,800 micrograms per liter(ug/l); the laboratory reported unmodified or weakly.modified gasoline <br /> wassigriificant. TPH-d was detected iii,the'water sample collected from MW-2 at a concentration <br />'. of 3,300 ug/l; the laboratory,reported that the diesel.chromatograms for the samples did not have <br /> typical diesel characteristics. <br />' Various BTE&X compounds were detected in wateusamples collected fromWellsMW-1, MW-2 ' <br /> and MW-4 at.concentrations ranging between 0.70 ,ug/l and 1,200 4g/l (benzene, MW-2). <br />''• MTBE ,was.not.detected in water sarn les collected from wells MW- - <br /> p 1 through MW 4; fuel <br /> oxygenating compounds �vere not detected in the analyzed water samples. <br /> IAnalytical results of the ground water samples are summarized in Table 2. The laboratory reports <br /> (McCampbeIl Analytical Inc. I.D. No.'97321. through 97324) and chain-of-custody forms are <br /> presented in Appendix B. <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected during'the.October 1498 monitoring event, AGE concludes: <br /> • water was inferred to be flowing toward the(�o�heastt a calculated gradient <br /> 0013ft/ r approximately 70 feet per mile (Fi ure 3 Due to the low radient at the <br /> g } g <br /> site, slighfvariati6ns in ground water measurements or changes of recharge/discharge•of the <br /> local ground water could greatly ,niodify gr nd water flow direction. <br /> From July to October, '1998. a substantiaincrease in dissolved petroleum hydrocarbon <br /> concentrations were observed from well M . - able 2). <br /> • <br /> In July 1998; concentrations"oTPH-d were detected at-MW-I and MW=3-at concentrations <br /> ranging up to 500�g/1; however, in ober 1998, TPH=d was,not detected at concentrations ' <br /> above laboratory reportifig limits: <br /> I <br /> Advanced CeoEnvironmental,Inc. , <br />