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Table 6 Historical Analytical Data for Groundwater Well Samples Former Colombo / Toscana Bakery 1444 South Lincoln Street Stockton , California 95206 Concentration and Associated MCLs (µg/L) Monitoring Sampling TPH=g Benzene Toluene Ethylbenzene Xylenes MTBE DIPE ETBE I TAME I TBA 1 , 2-DCA 1 ,2-DBA Well Date NE (1 ) ( 150) (300) (1750) (13) NE NE NE NE (0 . 5) (0 .05) MW-1 2/7/ 1996 160 ,000 225000 36 ,000 4 , 100 205000 NA NA NA NA NA NA NA MW=1 1 /16/2007 14,000 19100 410 620 1 ,000 160 <2 . 5 <2 . 5 <2 . 5 41 <2 . 5 <2 . 5 MW=1DUP 1 /16/2007 145000 19000 420 610 1 ,000 170 <2 . 0 <2 . 0 <2 . 0 40 <2 . 0 <2 . 0 MW= 1 4/13/2007 55900 350 40 230 180 150 <0 . 90 <0 . 90 <0 . 90 22 NA NA MW=1 DUP 4/13/2007 61300 410 48 320 240 160 <0 . 90 <0 . 90 <0 . 90 24 NA NA MW=1 7/23/2007 115000 820 110 310 260 34 < 1 . 5 < 1 .5 < 1 . 5 17 3 . 1 NA MW=1 DUP 7/23/2007 105000 800 98 300 270 28 < 1 . 5 < 1 . 5 < 1 . 5 16 2. 2 NA MW=1 10/16/2007 139000 19400 200 450 410 45 <2 . 5 <2 . 5 <2 . 5 16 <2 . 5 <2 . 5 MW=1 DUP 10/ 16/2007 105000 15200 180 400 350 50 <2 . 5 <2 . 5 <2 . 5 18 <2 . 5 <2 . 5 MW=1 1 /15/2008 9 ,000 13100 120 360 390 39 <2 . 5 <2 . 5 <2 . 5 20 <2 . 5 <2 . 5 MW=1DUP 1 / 15/2008 61200 740 76 230 240 29 <2. 5 <2 . 5 <2 . 5 < 15 <2 . 5 <2 . 5 MWA 4/14/2008 85900 800 82 280 300 30 < 1 . 5 < 1 . 5 < 1 . 5 17 < 1 . 5 < 1 . 5 MW= 1 DUP 4/14/2008 81100 710 74 280 290 32 < 1 . 5 < 1 .5 < 1 . 5 14 < 1 . 5 < 1 . 5 MW=1 A 7/23/2007 11600 3.9 0 .52 6 .2 8.3 5.9 <0 . 50 <0 . 50 <0 . 50 <5 . 0 <0 . 50 NA MW-1A 10/16/2007 830 3. 1 <0 . 50 1 .2 1 .3 4.9 <0 . 50 <0 . 50 <0 . 50 <5 . 0 <0 . 50 <0 . 50 MW=1 A 1 /15/2008 590 0 .65 <0 . 50 0.58 0 .57 3.4 <0 . 50 <0 . 50 <0 . 50 <5 . 0 <0 . 50 <0 . 50 MW-1A 4/14/2008 570 <0 . 50 <0 . 50 0.52 <0 . 50 3.3 <0 . 50 <0 . 50 <0 . 50 <5 . 0 <0 . 50 <0 . 50 S:\Shared\UST\Sara Lee\Project\Stockton (Lincoln Street)\2008 Remedial_Subsurface Investigation\2008_08 - Report\Investigation Report & SCM Tables (Rev).xls Page 1 Of 4