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s <br /> DISCUSSION OF RESULTS OF ABOVE WORK <br /> A review of all of the data obtained to date can be summarized as <br /> follows : <br /> 1 Soil contamination was first measured in MW-1 at 211611 , (BTEX <br /> only, ) with the highest levels in the interval 2616" to 311611 , <br /> BTEX & TPH-G ) Only Ethylbenzene was measured from the core <br /> sample taken at 3616" <br /> 2 Soil contamination was first detected in MW-2 at 251611 , (only <br /> xylene ) Ethylbenzene & xylene were found in the core sample from <br /> 301611 , and xylene & TPH-G were measured at 3516" <br /> 3 A small amount of benzene & TPH-G was measued in the soil <br /> samaple taken from MW-3 at 51 , and minor amounts of TPH-G were <br /> detected from samples at 101611 , 151611 , & 2016" This shallow <br /> contamination was most likely due to leaching from the removed <br /> spoil which was stored next to the location of the well . BTEX & <br /> TPH-G were measured from soil samples taken at 251611 , 301611 , & <br /> 351611 <br /> • 4 Groundwater was measured at an average depth of 36 .381 , which <br /> corresponds closely with levels located during placement of the <br /> monitoring wells . County Flood Control District maps indicate <br /> that the water table was around 27 ' bgl in the spring of 1983 & <br /> 1986 The highest levels of petroleum constituents detected in <br /> soil samples taken during the recent work occurred below 251 , <br /> which agrees closely with the 1983 & 1986 water level <br /> measurements <br /> 5 . The hydraulic gradient as measured on July 13 , 1995 is to the <br /> northeast at about 15 ' /mile - refer to PLATE XIV for details <br /> This corresponds to the regional gradient in the area <br /> 6 . The highest levels of contamination measured in somal samples <br /> were from MW-3 , the lowest from MW-2 However, the highest <br /> levels of benzene, toluene, ethylbenzene & TPH as gasoline in <br /> water samples were from MW-1; total xylenes were highest in MW-3 <br /> THP as gasoline measured in MW-2 & MW-3 were 2 . 7 mg/L & 2 6 mg/L, <br /> whereas MW-1 measured 6 5 mg/I Refer to TABLES II & III for <br /> details . <br /> 7 . Maps showing lines of equal concentration of benzene & TPH as <br /> gasoline, (PLATES XV & XVI, ) show that the highest levels were <br /> measured in MW-1, which is upgradient from the tank site . <br /> 9 <br />