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TABLE 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 DaVinci Drive <br /> Stockton,California <br /> Well ID! Ethyl- MTBE Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPS ETBE TAME Oxygen DTW SPT WTE <br /> (TOC) (pJ,-) (pts) (p9n-) (p91L) (pg/L) (p9/L) (pgg-) WIL) WI) W11-) (pg/-) 0WIL) (feet) (feet) (feet) <br /> MW-3 I 1 <br /> i <br /> 282 10/17/97 2.6 1 5 38 110 620 <5 0 -- -- - -- -- -- 829 0.00 -547 <br /> 03/22/98 ND 4 15 31 120 -- ! ND ND ND ND ND 019 655 000 -373 <br /> 06/15/98 <0.3 1.1 5.3 18 <100 -- <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 /> 12/29/98 <0 3 1.54 2.39 86 <50 -- <5 <20 <5 <5 <5 04 765 0.00 -483 <br /> 02/17/99 <0 5 <0 5 27 <0 5 <50 <5 0 <5 <20 <5 <5 <5 07 604 000 -322 <br /> 05/21199 <0,3 108 3.41 10.5 <50 -- <5 <20 1 <5 <5 <5 09 730 0.00 -4.48 <br /> iMW-4 <br /> 258 10/17/97 610 760 320 2,800 20,000 18,000 23,000 -- -- -- -- -- 804 0.00 -546 <br /> 03/22/98 81 56 32 27 2,600 -- 26,000 ND ND ND ND 030 627 000 -369 <br /> 06115/98 700 20 170 73 22,000 -- 17,000 <5,000 <250 <250 <250 21 647 000 -389 <br /> Well aban oned -- — — — <br /> MW-5 <br /> I I� <br /> 257 02/17/99 85 <1 30 110 890 49 62 <20 <5 <5 I <5 07 579 0 00 -3 22 <br /> 05/21/99 242 086 141 172 220 -- 188 <20 <5 <5 <5 09 700 0 00 L -4 43 <br /> Explanation --- - - ------- ------- - <br /> -=Not availablelnot sampled TOC=Top of casing elevation(:n 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 /> RIPE=Dusoprophyl ether pg/L=Micrograms per liter <br /> ETBE= Ethyl-tert-butyl ether mglL=Milligrams per liter <br /> TAME=tert-Amylmethyt ether <br /> 20632TB2 WK4 Page 2 of 2 <br />