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<br /> Tank Pit Excavation Soil Sample Results
<br /> Sample Date TPHG Benzene Toluene Eth Iben Xylene MTBE
<br /> mg/kg u k ug/k ug/kug/kq ug1kS ug/kg
<br /> Stockpiles
<br /> SP#1 top north 5!3199 ND ND ND ND 29 no data
<br /> SP#1 top center 513199 ND ND 10 15 190 no data
<br /> SP#1 top south 513199 ND NO ND ND 25 no data
<br /> SP#2northend east 4130199 1,100 980 19,000 21,000 110,000 220
<br /> SP#2northend west 4130199 540 210 2,400 5,300 30 000 ND
<br /> SP#2southend west 4130199 1,700 4 600 83,000 42 000 230 000 580
<br /> SP#2southend east 4130199 3,500 5,000 71,000 68000 400 000 2,700
<br /> AVERAGES 977 1,541 25 057 19 471 110 034 875
<br /> Tank Pit Soil
<br /> Samples
<br /> Tank Pit west 4130199 840 5,000 71,000 68,000 400,000 420
<br /> sidewali 9 5'
<br /> Tanis Pit north 4130199 1 100 900 3,000 22 000 EOOO
<br /> 1 100
<br /> sidewal! 10
<br /> South sidewall 10' 4/30199 2,200 5,900 34 000 38,000 3,100
<br /> Bottom sample 4/30199 1,200 3,000 3,700 28,000 2000
<br /> 12 5'
<br /> East sidewall 9 5/3!99 1,300 870 15,000 16,000 ND
<br /> • AVERAGES 1 328 3 134 25 340 34,400 147 200 1,324
<br /> Detection limits are TPHG 50 ug/l, BTEX 0 5 ug/l, MTBE,TSA, ETBE, TAME 5 0 ugA, DIPE 10 ug/l
<br /> Tank Pit Excavation Groundwater Results
<br /> Sam ie Date TPHG Benzene Toluene Eth Iben Xylenes MTBE
<br /> m /l u /i u /l u /l u ll u /I
<br /> Tank pit
<br /> Water 105' 4/30/99 42 3,600 1,100 1,500 1 4 500 58
<br /> Detection limits are TPHG 50 ugA, BTEX 0 5 ug/I, MTBE, TBA, ETBE, TAME 5 0 ug/l, DIPE 10 ug/l
<br /> The contaminant calculations are estimates of material removed by Wright, presented with the
<br /> following assumptions The averages from the soil data were used for soil and the tank pit water
<br /> sample for groundwater which flooded the excavation The soil contaminant mass removed is
<br /> assumed from the stockpile numbers, the Contaminant soil mass remaining is assumed from the
<br /> tank pit sndewall and bottom samples in a capillary fringe Meet thick and 3-feet wide along the
<br /> excavation perimeter Calculations used methods from Lyman, Reidy and Levy (1992)
<br /> Page 5
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