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Table Groundwater VOC Analytical Data Former ARCO Service Station#4493 205 North Center Street Stockton,California cis-1,2- Tms-1,2 Tetrachloro- Trichloro- 1,2,4- 1,3,5- n-Butyi- sec-Butyl- dlchioro- dichioro- Chloro- isopropyl- Naphth- n-Propyl- 1,1,2,2-Tetra- ethene 1,1,2-Trichlo- ethene Trimethyl- trimethyt- Well Date benzene benzene ethene ethene form benzene alene benzene chloroethane (PCE) roethane (TCE) benzene benzene Number Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) _ (ppb)......__(ppb)_ (ppb) (ppb) (ppb) (ppb) MW-1 2116199 NO NO 39,4 NO 11.1 NO NO NO ND NO NO 433 NO NO 3110199 - - - - - -- -- -- -- -- - -- --10 < -- 06/17/99 <10 202 2.62 <2 <10 <25 <10 7.04 2.34 2.36 126 4.40 <2.0 09/24/99 - - -- - -- - -- - -- -- -- -- -- -- 12116/99 2.38 <2.0 262 3.28 <2.0 <2.0 <5 <2.0 <2.0 <2.0 <2.0 37.6 <2 <2 03/28/00 <5.00 <2.00 368 4.7 <2.00 <2.00 <5.00 <2.00 2.38 2.74 2.20 227 <2.00 <2.00 06/19/00 <2.00 <2.00 369 3.66 <2.00 <2.00 <5.00 <5.00 2.16 <2.00 2.20 153 <2 00 <2 00 09/19/00 <2.00 <2.00 361 3.48 <2.00 <2.00 <5.00 <5.00 <2.00 <2.00 <2.00 185 <2.00 <2.00 MW-2 2116199 NO NO 10.6 ND NO NO NO NO NO 2.50 ND 106 NO NO 3110199 - - - - - - - -- -- -- -- -- 06/17/99 <10 <10 3.54 <2.0 <2 <10 <25 <10 <2.0 52.0 <2.0 59.2 <2.0 <2.0 09/24/99 <2.0 <2.0 3.84 <2.0 <2.0 <2.0 <5,0 <2.0 <2.0 <2.0 <2.0 54.4 <2.0 <2.0 12/16/99 <2.0 <2.0 3.36 <2.0 <2.0 <2.0 <5.0 <2.0 <2.0 <2.0 <2.0 53.4 <2.0 <2.0 03/28/00 <2.00 <2.00 8.80 <2.00 <2.00 <2.00 <5.00 <2.00 <2.00 <200 <2.00 96.6 <2.00 <2.00 06/19100 <2.00 <2.00 4.62 <2.00 <2.00 <2.00 <5.00 <5.00 <2.00 <2.00 <2.00 77.6 <2.00 <2.00 09/19/00 <2.00 <2.00 5.08 <2.00 <2.00 <2.00 <5.00 <5.00 <2.00 <2.00 <2.00 73.8 <2.00 <2.00 MW-3 2116199 NO ND ND NO NO NO NO NO NO NO NO 2.09 NO NO 3110199 -- - - - - - - - -- -- -- -- - 06l17199 <10 <10 <2.0 <2.0 <2 <10 <25 <10 <2.0 <2,0 <2,0 <2.0 2.96 <2.0 09/24/99 -- - - - -- - - -- -- -- - -- -- 12/16/99 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <5.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 03/28/00 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 <5.00 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 06/19/00 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 <5.00 <2.00 <2.00 <2.00 <2.00 <2.00 52.00 <2.00 09/19/00 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 <5.00 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 MW-4 2116199 63.8 NO ND ND 21.3 59,2 342 216 NO NO ND NO ND ND 3110199 - - - - - - - -- -- -- 6117199 40.4 14.3 67.6 <2.0 <2 47.2 372 179 <2.0 <2.0 <2.0 <2.0 1,210 299 09/24/99 21.4 9.12 53.6 <4.0 <4.0 31.8 142 109 <4.0 <4.0 <4.0 8.44 720 616 12/16/99 33.4 16.8 36.8 <4.0 <4.0 72.8 61.6 224 <4.0 <4.0 <4.0 <4.0 751 21.4 03/28/00 20.4 11.3 9.68 Q.00 <2.00 32.2 110 93.2 <2.00 <2.00 <2.00 <2.00 382 53.8 06/19/00 17.8 8.50 8.80 <2.00 <2.00 29.4 84.6 73.4 <2.00 <2.00 <2.00 <2.00 156 15.8 09/19/00 19.5 10.4 16.9 <2.00 <2.00 38.8 76 104 <2.00 <2.00 <2.00 <2.00 162 15.3