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1 <br />' from 26 96 feet to 28 31 feet Groundwater has risen an average of 0 28 feet since the March <br /> 1, 1994 monitoring and 112 feet since the November 1993 monitonng <br /> Based on depth-to-groundwater measurements, the hydraulic gradient was calculated to be <br /> 00-0 040 ft/ft directed N 58° W (Figure 3). The flow direction and gradient are similar to that <br /> ' calculated for previous monitoring events <br /> 4.2 Analytical Results of Monitoring Well Samples <br /> ' TPH as gasoline was detected in water samples from MW-1 and MW-2 at concentrations <br /> of 220 ppb and 31,000 ppb, respectively BTE&X were detected in MW-2 at concentrations <br /> ' of 280 ppb, 1,600 ppb, 1,900 ppb and 8,100 ppb, respectively No BTE&X were detected in <br /> MW-1 No petroleum hydrocarbons were detected in the sample from MW-3 The analytical <br /> results are summarized on Table 2 The laboratory report and chain-of-custody are included <br /> ' in Appendix B <br /> 4.3 Analytical Results of Rinseate and Stockpiled Soil Samples <br /> Ethylbenzene and xylenes were detected in the water sample from drum D-1 at <br /> ' concentrations of 0 53 ppb and 2 9 ppb, respectively TPH as gasoline was detected in the <br /> composite sample from drums D-2 and D-3 at 2,100 ppb, BTE&X were detected at <br /> concentrations of 16 ppb, 76 ppb, 88 ppb and 380 ppb, respectively <br /> Noetroleum hydrocarbons were detected in composite soil sample SP-1 and SP-2 TPH <br /> P <br /> as gasoline was detected in the soil sample from drum D-4 at 450 ppm, toluene, <br /> ' ethylbenzene and xylenes were detected at concentrations of 12 ppm, 18 ppm and 6 5 ppm, <br /> respectively The laboratory report and chain-of-custody are included in Appendix B <br /> !' <br /> ' ! TABLE 2 I <br /> ;ANALYTICAL RESULTS of WATER SAMPLES <br /> ' ' I Conrady Service Station <br /> AWL I <br /> Sample ID TPH as Ethyl- <br /> Gasoline Benzene Toluene benzene Xylene <br /> MW-1/11-1-93 '�1,300 'i, 40 06 17 38 <br /> MW-1/3-30-94 { 220 ND ND ND ND <br /> MW-2/1171=93 3100 560 1,700 1,600 6,300 <br /> MW-2/3-3Q-94 311,000 280 1,600 1,900 8,100 <br /> MW-3/I1-I-93 ND 119 I ND ND ND I I <br /> MW-3/3-30-94 I ND ND ND ND ND ! <br /> ! A i parts per 10 (ppb) <br /> ND I I None Detected I ! I I I ! I I I <br /> CeobgKd A.&[Se�foc <br /> mo <br /> 4 C..ody S.—SuQFM 4411.48 III 71 III <br /> `4�itp Il il' 1 I k r I E <br /> 11�l Ij `' ' I 11`V1 'I!I'I' 'Il1�! I II '' III'll III ! ci IIIII IIv SII! iI!I'ulI II'! iu .I iI I I'' I II <br /> I <I n � I. II Ir. II SII fel � f ,i <br />