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are oresent only in concentrations <br /> It is estimated that adsorbed-phase hydrocarbon constituents <br /> remaining onsite, if $per million (ppm) of total petroleum <br /> of less than 10 parts p TPH-G and as diesel (TPH-D) and <br /> + hydrocarbons as gasoline ( fringe. Table 1 presents a <br /> are limited to the capillary g ling performed <br /> summary of analytical results.for the5so0$Q cubic yards of <br /> at the site. To date, approxmately <br /> characterized, and transported <br /> soil has been excavated, <br /> All areas I <br /> offsite for proper disposal. roximately 10rfeet cbelowdgrade, <br /> to e <br /> depth cf ground waterat apg terial• Figure 2 shows the <br /> and of backfilled <br /> with ,tedaareall ma <br /> offsite <br /> is Adsorbed-phase hydrocarbon constituents in the soil drilling <br /> with 180 ppm TPH-D and <br /> were detected only in soil �amP1B82�ollected during <br /> of monitoring well Al -b (boring <br /> below <br /> 38 parts per billion (ppb) of xylenes at to <br /> Om6of TPHtD at 11 <br /> grade (pre-drought capillary zone) and 5.4 ri Monitoring <br /> to 11.8 feet. below grade in the capillary fringediesel <br /> - <br /> Well AW-6 is locateoa. Noadient of detectabletTPHfG he orrbenzene, <br /> storage tank locati orted in <br /> toluene, or ethylbenzene constituents have been rep <br /> soil samples collected offsite. <br /> 2.3 <br /> temporaryand permanent <br /> Ground watewelspindicateles ethat thected mground waer has been <br /> monitoring s ind um hydrocarbon constituents. The most <br /> - impacted with g April 30 and May 1 <br /> recent sampling event was conducted on <br /> and 7, 1991, in which ground ng wells andsanalyzedcollected <br /> TPH-G, <br /> from all borings and monitoring and total xylenes <br /> TPR-D, and benzene, toluene, end water an ical results are <br /> (BTEX) constituents. The ground avatar d bell' <br /> presented in Table 2, and are summarized below: <br /> llected from <br /> o TPH-G was detected in water samplesatoconcentrations <br /> AW-3, B-2, B-6, B-7, B-B, and o 1 b in B-7. <br /> ranging from 210 ppb in ion to 110,000 concentrations <br /> inthe groundnwatersmontr itoring wells,of TPH-G cbasedtontthes <br /> in g <br /> April/May 1991 sampling results. <br /> BTEX constituents were detected-7 n(the watt :sinedes <br /> collected from Aw-3, <br /> E-3, and Bthe highest BTEX any sampleexceptBenzene was not from B-7 <br /> detected b. any p adjacent to the <br /> at 560 ppb. Boring B-7 was locatdtanks. <br /> former above ground diesel storage <br /> roduct was observed in this sampling event <br /> or o or free p any previoussamplingevent conducted at the site. <br /> -- - _ <br /> 3 <br />