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TAR 3 ESTIMATED HYDROCARBON MASS REMOVAL RATE GROUNDWATER REMEDIATION SYSTEM 8200 N I-itghway 99, Stockton, CA AVG CONCENTRATIONS(uglL) ESTIMATED MASS REMOVED(pounds) PERIOD IETHYL- PERIODENDING VOLUME TPHG BENZENE TOLUENE ETHYL- XLENES MTBE TPHG BENZENE TOLUENE XLENES MTBE DATE (gallons) BENZENE BENZENE 11/10/03 4220 20500 2650 1500 190 810 8950 072 009 005 001 003 031 11/17/03 14225 15500 2550 1100 155 655 9750 184 030 013 002 008 115 12/15/03 14645 13500 2500 1200 103 550 10500 165 030 G15 001 007 1 28 12/22/03 16128 20000 3150 2150 93 695 15000 269 042 029 001 009 201 12/30/03 13032 23500 3950 2950 135 940 18000 255 043 032 001 010 1 95 01/05/04 11330 24500 1 4100 3200 170 1075 16000 231 039 1 030 002 010 1 51 02/09/04 65072 26000 3700 3500 190 1350 10450 1409 200 1 190 010 073 566 03/08/04 52152 24500 3200 3700 185 1400 6050 1064 1 39 161 008 061 263 04/14/04 50282 22000 2850 3650 155 1200 1 4800 921 119 1 53 006 050 201 05/10/04 28700 15500a 1900 2700 115 885 3350 370 045 065 003 021 080 06/14/04 41994 14000a 1500 2250 130 715 3450 4 90 052 079 005 025 121 07/16/04 28238 16000 1 2300 4250 250 1380 3450 3 76 054 1 00 00'6 032 081 09/01/04 9002 2500 2450 6500 670 4000 1965 019 018 049 005 030 015 09/15/04 7451 39000 1330 6250 970 6300 720 242 008 039 006 039 004 10/26/04 22066 30500 640 3550 585 4100 955 560 012 065 Oil 075 0 18 11/24/04 49065 15000 860 2050 164 1550 1030 613 035 084 007 1 063 042 12/16/04 86581 2100 255 400 133 235 720 151 018 029 001 017 052 01/24/05 82325 2550 305 375 103 255 715 175 021 026 001 017 049 02/25/05 91437 3500 380 585 37 450 825 266 029 045 003 034 063 03/30/05 1 131971 3500b I 380b I 585b 37b 450b 825b 385 418 064 004 049 091 CUMULATIVE 1 619916 82 16 13 64 1270 083 636 24 66 TOTALS Notes a=Estimated concentration extrapolated from BTEX&MTBE concentrations b=Estimated concentration by averaging previous two sampling results