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Tab <br /> Historical Groundwater Monitoring Data <br /> 7-Eleven Store#20632 <br /> 4627 DaVlncl Drive <br /> Stockton California <br /> Well ID/ Ethyl- I MTBE Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPE ETBE TAME Oxygen DTW SPT WTE <br /> (TOC) (pg1L) (pglL) (pg1L) (p91L) (p91L) (pg1L) (pg1L) (pg1L) (p91L) (pg1L) (pg1L) (mg1L) I (feet) (feet) (feet) <br /> MW-3 <br /> 282 10/17197 26 15 38 110 620 <50 -- -- -- -- -- 829 000 -547 <br /> 03/22/98 ND 4 15 31 120 -- ND ND ND ND ND 0 19 655 000 -373 <br /> 06/15/98 <03 1 1 63 18 <1 -- <10 <100 <5 <5 <5 10 672 000 -390 <br /> 08/25/98 06 <0 3 936 <0 6 <50 -- <5 <50 <5 <5 <5 - 756 000 -474 <br /> 12/29198 <0 3 1 54 239 86 <50 -- <5 <20 <5 <5 <5 04 765 000 -483 <br /> 02117/99 <0 5 <0 5 27 <0 5 <50 <5 <5 <20 <5 <5 <5 07 604 000 -322 <br /> 05/21/99 <0 3 1 08 341 105 <50 -- <5 <20 <5 <5 <5 09 730 000 -448 <br /> 08/28/99 <0 3 <0 3 <0 3 <0 6 50 - <5 <20 <5 <5 <5 09 795 000 -513 <br /> 11/24/99 <0 3 <0 3 <0 3 <0 6 95 896 <5 <20 <5 <5 <5 13 770 000 -488 <br /> 02/02100 <0 3 <0 3 <0 3 <0 6 <50 <5 1,411 <20 <5 <5 <5 1 2 656 000 -374 <br /> MW-4 <br /> 258 10/17197 610 760 320 2,800 20,000 18,000 23,000 -- -- -- - -- 804 ( 000 -546 <br /> I 03/22/98 81 a 56 I 32 27 2,600 -- 26,000 ND ND ND ND 030 627 000 -369 <br /> 06115/98 1 700 20 170 73 22,000 - 17,000 <5 000 <250 I <250 i 1250 2 1 647 I 000 -389 <br /> I <br /> 08114198-Well Abandoned <br /> iiMW-5 I � <br /> 257 02/17/99 i 85 <1 30 110 890 49 62 <20 <5 ' <5 <5 07 579 000 -322 <br /> 1 05/21199 1 242 086 141172 220 -- ! 188 <20 ! <5 <5 <5 09 700 ! 000 -443 <br /> 08128199 36 6 <13 32 1 348 296 -- 64 <20 <5 l <5 <5 11 671 000 -4 13 <br /> 11/24/99 214 1 29 142 1 149 257 259 281 <20 <5 <5 <5 I 1 1 7 50 I 000 -493 <br /> 02/02/00 296 <0 3 266 I 063 1 284 353 761 120 <5 <5 <5 1 1 650 000 1 -3 93 <br /> Explanation <br /> =Not available/not sampled TOC=Top of casing elevation(in feet above mean sea level) <br /> TPH G=Total petroleum hydrocarbons as gasoline DTW=Depth to water <br /> MTBE=Methyl tert butyl ether SPT=Separate phase hydrocarbon thickness <br /> TBA=tert Butanol WTE=Water table elevation <br /> DIPE=Dusoprophyl ether pg/L=Micrograms per liter <br /> ETBE=Ethyl tert butyl ether mg1L=Milligrams per liter <br /> TAME=tert Amylmethyl ether <br /> 20632TB1 WK4 Page 2 of 2 IT CORPORATION <br />