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TABLE 4 I SUMMARY OF ANALYTICAL RESULTS Former Canteen Facility 1500 Shaw Road Stockton, California Ethyl- Corrected Adjusted Sample Sample Benzene Toluene Benzene Xylenes BTEX MTBE TPH PIDs Rcvy/Emis Location Date (1.ig/L) (WJL) (WL) (µg/L) (µg/L) (µg/L) (pg/L) (ppmv) (lbs/hr)4 SVE lnfl 03/25/04 350 I,000 110 480 1,940 500 15,000 3,230 Effluent 1 390 340 920 460 93 1 250 270 27 ICE Unit Efficiency. 98.9% 966% 916% 904% 952% 950% 982% 99.2% SVE Infl 04/02/04 290 490 30 100 910 500 12,000 4,120 Effluent 0 250 _ 0 250 0 250 0 250 loo 250 25 32 ICE Unit Efficiency. 999% 99.9% 99.2% 998% 999% 998% 99.2% SVE Intl 04/16/04 230 370 18 69 687 500 5,100 1,099 Effluent 0250 v 0 250 0 250 0 250 100 250 25 68 ICE Unit Efficiency. 999% 99.9% 98 6% 996% 999% — 995% 938% I VE Infl 05/07/04 230 520 230 990 872 500 7,100 647 Effluent 340 160 150 690 277 025 1,400 28 ICE Unit Efficiency: 85.2% 692% 348% 313% 682% --- 803% 95.7% SVE Infl 05/19/04 160W 480 280 120 788 500 7,100 647 ffl Euent 130 110 140 680 205 0 25 960 28 ICE Unit Efficiency. 91.9% 77.1% 50.0% 433% 740% --- 865% 95.7% r SVE Infl 06/04/04 100 370 250 99 594 <25 5,800 2,012 1938 ` Effluent _ T —11 0 — 90 110 450 - _157_ <2 5 880 457 — 0 035 ICE Unit Efficiency- 890% 75.7% 560% 545% 736% --- 848% 977916 98.2% I SVE Infl 07/28/04 100 720 790 380 1,279 <50 8,000 6,679 4 485 Effluent _0125 0 125 0 125 0 125 0 500 _<2 5 125 _2 13 _0 002 ICE Unit Efficiency: 999% 1000% 99 8% 1000% 1000% -- 998% 1000% 1000% ISVE Influent 09/03/04 550 370 530 240 718 <50 5,500 780 1 019 Effluen 1 200 380 130 600 113 <2 5 500 532 0 037 ICE Unit Efficiency 96.4% 89.7% 75 5% 750% 843% — 90.9% 932% 964% ISVE Influent 10/15/04 940 430 160 780 1,464 <50 8,400 448 0 873 Effluent 1 200 380 130 600 113 <25 25 0 1 14 0 001 ICE Unit Efficiency• 979% 91.2% 919% 92.3% 923% --- 99.7% 997% ; 999% SVE Influent 10/29/04 880 330 100 580 1,098 <50 6,500 1,398 1 181 Effluent 200 380 130 600 113 <2 5 125 000 0 000 IICE Unit Efficiency 977% 88511. 87.0% 89.7% 89.79.1 -- 99.8% 1000% 100.0% NOTES I I To determine the influent and effluent concentrations,the following analytical methods were utilized BTEX — Modified EPA Method SW846-8021 B MTBE — Modified EPA Method SW846-8021B TPH — Modified EPA Method SW846-8015 XG 2 The shaded values indicate constituents which were found to be MDL One half the BDL is presented for calculation purposes �3 SVE Infl indicates samples obtained prior to the ICE unit and represent only the vapors being removed from the subsurface The ICE effluent includes the remaining hydrocarbons from BOTH the Influent stream and the supplemental propane supply For these reasons,the"ICE Unit Efficiency" is inherently underestimated(the actual number is higher than indicated) 4 The in-flow of propane has been added to the Influent recovery rates to get an accurate portrayal of destruction efficiency I