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1 <br /> r 6 <br /> 1 <br /> ' SB-1 BENZENE TOLUENE E BENZENE XYLENE TPHg TPHd <br /> 661 (ppm) < .51 < 51 < 51 < 51 72 7 3480 <br /> 711 (ppm) <1 3 <1 3 <1 3 1 6 14 1 18000 <br /> ' MW-1 @ 681 <br /> (ppb) ND< 3 ND< 3 ND< 3 0 8 222 ND<50 <br /> (ppm) ND< 003 ND< 003 ND< 003 0 008 0 222 ND< 05 <br /> tSUMMARY AND CONCLUSIONS <br /> ' Based upon an analysis of all of the data obtained to date, the <br /> following summary & conclusions appear warranted, <br /> 1 The hydraulic gradient is highly divergent, indicating a very <br /> ' restricted aquifer that is not influenced by regional flow <br /> 2 . The maximum change in the potentiometric surface since <br /> ' monitoring began in April , 1992 is 6 316 , supporting the evidence <br /> of a very restricted aquifer. <br /> 3 As the table above shows, the permeability of the soil is <br /> �1 extremely low The level of xylene measured in the water is <br /> 1/200th of the amount in the soil 206 away TPHg measured in the <br /> water is about 1/63rd the amount in the soil TPHd in the soil <br /> ' was measured at 18, 000 ppm, it is below detection levels in the <br /> water <br /> ' 4 The large volume of data collected to date at this site <br /> indicates that the minor amounts of contamination measured in the <br /> groundwater from MW-1 has remained at very low levels since <br /> monitoring began Benzene has not been detected in the last <br /> ' seven (7) monitoring events, and Toluene has never been found. <br /> Ethylbenzene has been measured only once, at 0 4 ug/L Xylene <br /> has been detected three times, at 27 ug/L in June, 1993 , 1 . 3 ug/L <br /> in October, 1996 , & 0 8 ug/L in November, 1996 . TEPH as diesel <br /> was found only three times, in September, 1992 (0 11 ug/L, ) June, <br /> 1993 (3 0 ug/L, ) and November, 1994 0 34 ug/L TPH as gasoline <br /> ' was ND in April & May, 1992 , and was not tested until the latest <br /> sampling. <br /> RECOMMENDATION <br />' Based upon an analysis of all of the extensive data collected at <br /> this site, we believe that the site has been fully and thoroughly <br />' characterized, and that continued monitoring is not justified <br /> Therefore, we recommend that the three wells on the property be <br /> destroyed, all remaining stored soil & water be properly disposed <br />' 2 <br />