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. 23 May 2001 AGE-NC Protect No 95-0144 IPage 5 of 8 ' MW-12, MW-13 and MW-18 Ground water was within the screened intervals of MW-19A, MW-20A and MW-2 I Ground water elevations in nested wells MW-19, MW-20 and MW-21 were between 1 14 and 2 01 feet lower in deeper screened intervals beneath a potentially confining clay layer than in the shallower screened intervals Data from wells with the upper screened intervals, established in first-encountered ground water, was utilized for gradient determination ' r 3 2 ANALYTICAL RESULTS OF WATER SAMPLES ' I During the February 2001 monitoring event, TPH-g was detected in samples from monitoring wells MW-21A and MW-21B at concentrations of 2,200 pg/l and 650 µg11, respectively BTEX compounds were detected in samples from wells MW-1, MW-21A and MW-21B at concentrations as high as 180 gg/l(benzene, MW 21A) TPH-d was detected in samples collected from MW-20A, ' MW-21A and MW-21B at concentrations of 220 µg/1, 5,100 µg/1 and 270 4g/1, respectively TPH-mo was detected in monitoring well sample MW-21A at a concentration of 3,000 µg/1 The �. extent of hypdi ocarbon-Impact ground water is illustrated in Figure 4 _F MTBE was not detected in ground water samples from the monitoring well network Historically, only low concentrations of MTBE and TBA have been detected intermittently at the site J S l ! Analytical results for February 2001 are siimnmarized on Table 2 Analytical results of recent and ' historical groundwater samples are summarized on Table 3 The laboratory report(MAI Laboratory I Ds 61114 through 61123) and chain-of-custody forms are included m Appendix-C r 1 3 3 ANALYTICAL RESULTS ,OF BIOLOGICAL ANALYSES iAnalysis of the samples collected from wells MW-21A and MW-21B indicate nutrient concentrations suitable for microbial activity and degradation of hydocarbons Hydrocarbon- ` degrading microbial activity was indicated`for samples collected from both wells The laboratory report(AKK report dated 13 April 200 1) and chain-of-custody form are included m Appendix C 3 4 ANALYTICAL RESULTS OF EXCAVATION SOIL SAMPLES ' t y Four samples were collected at various locations from the,excavation soil stockpile TPH-g was detected in the four stockpile samples at concentrations ranging from 1 3 milligrams per kilogram • (mg/kg) to 1,800 mg/kg TPH-d and TPH-mo were detected in three of the four stockpile samples - ! Y .Advanced GeoEnv►ronmental,Inc r T