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Units - ug/l T ppb <br /> : mg/1 = ppm <br /> ND = not detectable at limit shown <br /> EPA: 602 : DLR . 3 ug/1 <br /> : 5030 DLR .05 mg/l <br /> ' Benzene Toluene E 'benzene Xylene (TPH-G) (TPH-D) <br /> MW # 1 <br /> EPA: 602 EPA: 5030 <br /> ' ND ND ND ND ND ND <br /> MW # 2 <br /> EPA: 602 EPA: 5030 <br /> ' ND ND ND ND ND ND <br /> MW # 3 <br /> t EPA 602 EPA: 5030 <br /> ND ND ND ND ND ND <br /> ' DISCUSSION OF DATA <br /> ' The three monitor wells were located with MW # 1 within 10' <br /> of the excavation, where soil contamination had been found <br /> at the time of the tank pull„ and MW # ' s 2 and 3 located <br /> in a down-gradient direction as determined from regional <br /> maps (See attached work plan) . <br /> Boring logs and casing completion data are shown on Figures <br /> ' 2 through 4--A of this report. In general , all wells were <br /> completed with 15 ' of perforations, with about 2 extending <br /> above the water table as located w ile drilling. orn <br /> Figure 5; the water table as determined while� drilling did <br /> ' not represent the standing hydraulic~ head, which, was �some �2' <br /> to 6 ' higher. Th�.s was caused by the presence =of a�n <br /> aquiclude aboue the highest water bearingstrat�a,' w;hic�h <br /> ' confined the water below tThe term aquiclude is <br /> used here ra her than aquitard because the clays encountered <br /> do not necessarily represent a total barrier to fluid <br /> ' migration Cover a long period of time . BRe�aaus,e, this qZq�uiclude <br /> ex•�sts 4 an►y _contaminants in the , wa�t�er grtognd the wells would <br /> still be con'd'ucted to the1 wells ,through the Iii�orfizontally <br /> perms ble sec�tian and enter, the well bare up,-,V bail�2ng: <br /> ' Therefore, the results of testing would be exactly the same <br /> as if the perforations were Open above the water table in a <br /> vertically permeable environment. <br /> ' Contamination was found in samples from MW # I as shown on <br /> Figure 5 . A sinal l° Maimount of T•RHI-+D wa4s found below they <br /> staEndi=ng hydraulic head level , which indicates that a very <br /> small amount of hydrocarbons had migrated below the present <br /> water tab41 a at a` gime when the l eve l must havfe I eeng wome�what <br /> t <br />' B <br />