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Table 1 _ Groundwater Analytical Data Parkinson's Arco 3250 West Hammer Lane Stockton,California Top of Casing Depth to Groundwater TPH as Ethyl- Tert-Butyl Sample Date Elevation Water Elevation Gasoline Benzene Toluene benzene Xylenes MtBE DIPE ETBE TAME Alcohol Identification Sampled (MSL) feet b s) MSL u 1 u (u (u _C119/1) (u u (u ]) (u u lE MW-I 09/21/00 430 1296 -866 25,700 1,820 503 1,450 582 28,300 <2 0 292 108 3,710 01/19/01 1290 -8 60 2,250 178 10 155 244 34,200 <2 0 260 215 3,910 04/23/01 1194 -7 64 19,000 1,780 208 1,480 1600 39,500 <100 <100 285 4,780 07/27/01 1312 -882 13,000 1,700 98 1,100 730 40,000 <200 <200 290 <20,000 11/01/01 1412 -982 14,000 1,100 20 980 470 24,000 <20 <20 190 2,400 01/28/02 1261 -831 8,700 1,100 <50 1 000 320 18,000 <250 <250 <250 <2,500 MW-2 09/21/00 474 1323 -849 529 <0 5 <0 5 <05 <0 5 5,830 <2 0 <20 45 1,150 01/19/01 1323 -849 <500 <5 0 <5 0 <5 0 <5 0 2I,600 <2 0 <20 168 2,520 04/23/01 12 27 -753 <500 <5 0 <5 0 <5 0 <5 0 10,400 <2 0 <2 0 675 697 07/27/01 1345 -8 71 190 <0 5 2 0 41 29 4,800 <100 <100 <100 <10,000 11/01/01 1445 -971 <50 <0 5 <0 5 <0 5 18 3,100 <1 0 <1 0 21 <100 01/28/02 1293 -8 19 <50 <0 5 <0 5 <0 5 <05 3,300 <100 <100 <100 <1,000 MW-3 09/21/00 376 1234 -858 5,900 413 243 562 468 346 <2 0 <2 0 2 08 <200 01/19/01 1230 -854 1,870 182 582 129 23 1 682 <2 0 <2 0 443 <200 04/23/01 1134 -758 1,160 6 3 <5 0 105 184 683 <2 0 <20 423 <200 07/27/01 1248 -872 870 21 16 9 0 17 360 <20 <20 <20 <2,000 11/01/01 1352 -976 760 35 <05 58 9 2 600 <1 0 <1 0 46 <100 01/28/02 1200 -824 560 5 9 0 87 4 6 45 590 <0 5 <0 5 3 8 <5 0 I ugA Micrograms per liter MSL Mean sea level bgs Below ground surface TPH Total petroleum hydrocarbons MtBE Methyl tert-butyl ether DIPE Diisopropyl ether EI'BE Ethyl-t-butyl ether TAME Tert-amyl methyl ether EDB Ethylene dibromide N lrancfpllProjecislProjects18801040IlA10E0711gtr02 IT CORPORATION 2/1812002