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Table 2 Historical Groundwater Monitoring Data 7-Eleven Store#20632 4627 DaVInci Drive Stockton,California Well V Ethyl- MTBE Dissolved Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPE ETBE TAME Oxygen DTW SPT WTE (TOc) (irg1L) (ug1L) (µ91L) (µg1L) (µg1L) (µg1L) (µ91L) (pg1L) (µg1L) (µgfL) (P9n) (mg1L) (feet) (feet) (feet) MW-3 — --- �T --- 8 29 0 OQ -5 47 282 10/17197 26 1 5 38 110 620 <5 0 -- -- -- -- -' -- 03/22/98 ND 4 15 31 120 -- ND ND ND NO ND 019 655 000 -373 06115198 <0 3 11 63 18 <1 _. <10 <100 <5 <5 <5 10 672 000 -390 08125198 06 <0 3 936 <0 6 <50 -- <5 <50 <5 <5 <5 -- 756 000 -474 12!29198 <0 3 154 239 86 <50 -- <5 <20 <5 <5 <5 04 765 000 -483 02/17/99 <0 5 <0 5 27 <0 5 <50 <5 <5 <20 <5 <5 <5 07 604 000 -322 05121/99 <0 3 108 341 106 <50 -- <5 <20 <5 <5 <5 09 730 000 -448 08/28/99 <0 3 <0 3 <0 3 <0 6 50 -- <5 <20 <5 <5 <5 09 795 000 -513 11/24/99 <0 3 <0 3 <0 3 <06 95 896 _ <5L <20 <5 <5 55 13 -770-. 000 -488 MW-4 8 04 0 00 -5 46 2 58 10/17/97 610 760 320 2,800 20,000 18,000 23,000 -- -• -- -~ '- 0302198 81 66 32 27 2,600 -- 26,000 ND ND ND ND 030 627 000 -369 06/15/98 700 20 170 73 22,000 -- 17,000 <5,000 <250 <250 <250 21 647 000 -389 08114!98-Well Abandoned _ -__ -_ ___ _— MW-5 2 57 02/17199 85 <1 30 110 890 49 fit <20 <5 <5 <5 0 7 5 79 0 00 -3 22 05121/99 242 086 141 172 220 -- 188 <20 <5 <5 <5 09 700 000 -443 08/28/99 366 <0 3 321 348 296 -- 64 <20 <5 <5 <5 08 670 000 413 11/24199 21 4 1 29 14 2 1 49 257 25 9 281 <20 -<5 < _ _ <5 — 1 1 - 750 0 00 4 93 Explanation --=Not avaibablelnot sampled TOC=Top of casing elevation(in feet above mean sea level) TPH-G=Total petroleum hydrocarbons-as-gasoline DTW=Depth to water MTBE=Methyl-tert-butyl ether SPF=Separate phase hydrocarbon thickness TBA=tert-Butanol WTE=Water table elevation DIPE=Dusoprophyl ether NAIL=Micrograms per liter ETRE=Ethyl-cert butyl ether mg/L=MtliQrams per liter TAME=tert Amylmethyl ether 20632T81 WK4 Page 2 of 2 IT CORPORATION