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a� <br /> Chemical Analysis <br /> . Fourteen soil samples six groundwater samples will be analyzed at Kiff Analytical LLC, a <br /> certified analytical laboratory Samples were tested for the following, Total Petroleum <br /> hydrocarbons as Gasoline (TPHG), Benzene (B), Toluene (T), Ethylbenzene (E), Xylene (X) and <br /> Volatile Organic Compounds (VOC), Methyl-tert-butyl-ether (MTBE), and fuel oxygenates�tert- <br /> Amyl-Methyl-Ether, Ethyl-tert-Butyl-Ether, Di-isopropyl Ether and tert-Butyl Alcohol (TAME, <br /> ETBE, DIPE, TBA) Ethanol Methanol, 1,2-Dichlorethane and Ethylene Dibromide using EPA <br /> Methods 3550, 3510/8015, 5030, 8020 and 8260 The analytical reports are attached and the data <br /> is presented in Tables 1 and 2 below. <br /> Discussion <br /> Soil samples collected from beneath the former tanks pats showed highly degraded TPHD that <br /> did not match the laboratory pattern for Diesel fuel Very low levels of TPHG were present in <br /> three samples from below the former tank pat, however these samples were depleted in volatile <br /> content BTEX, Methanol and Ethanol were not detected in any sample, and contaminants were <br /> not detected in the underlying aquitard strata (see Figures 2 and 3) <br /> TPHG was detected in water samples B-1 and B-2 collected below the former tank pats and trace <br /> levels of Xylenes were detected in these samples MTBE was detected at 16 ug/1 in the <br /> groundwater sample B-3 taken in the middle of 11 h Street. TPHG and volatile constituents were <br /> not detected in water samples collected in the apparent downgradient locations across 11`" Street <br /> • The remaining water samples contained vanous concentrations of TPHD however the laboratory <br /> reports TPHD did not exhibit a typical diesel pattern and hydrocarbons detected in the water <br /> samples was somewhat typical of direct push samples that contain large amounts of sediment <br /> These data show that residual contaminants in soil and groundwater are present under the former <br /> tank pat One MTBE occurrence was observed only in B-3 under I Ib Street, however it was not <br /> detected in any other sample including those collected from the former tank pats While TPHD <br /> was detected in every water sample, the laboratory indicated that it could be a result of <br /> interference of sediment, and did not match the standard In our opinion the data show that only <br /> a very limited migration from the former tank pit of highly degraded contaminants are present <br /> The MTBE appearance is considered anomalous and does not appear related to the tank pits since <br /> there were no other MTBE or oxygenate detections in those soil and groundwater samples. <br /> Conclusions and Recommendations <br /> Six exploratory bonngs were drilled and sampled around the former underground tank pits at the <br /> 68 11 h Street site Tank removal data from 1993 showed low levels of TPHD in soil and <br /> groundwater samples collected at that time Samples from under the former tank pit locations <br /> and across 11"' Street in apparent downgradient direction revealed degraded TPHD TPHG was <br /> detected under the tank pits in groundwater, but was not detected in the downgradient samples <br /> One very low occurrence at B-3 of MTBE at 16 ug/l is considered anomalous since it occurred in <br /> Page 4 of 7 f <br />