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Groundwater Analytical Data Parkinson's Arco 3250 West Hammer Lane Stockton,California Top of Casing Depth to Groundwater TPH as Ethyl- Sample Date Elevation Water Elevation Gasoline Benzene Toluene benzene Xylenes MtBE DIPE ETRE TAME TBA 1,2•DCA Identification Sampled MSL feet s MSL (U911) u !I (ug/1) (URA) (ug/1) (ug") u fl (ug/1) u !I u !l EDB u 11 u It MW-3 09/21/00 3.76 12,34 -8.58 5,900 41.3 24.3 56.2 468 346 <2.0 <2.0 2.08 <200 01/19101 12.30 -8.54 1,870 18.2 5.82 12.9 23.1 682 <2,0 <2.0 4.43 <200 04/23101 11.34 -7.58 1,160 6.3 <5.0 10.5 18.4 683 <2.0 <2.0 4.23 <200 07/27/01 12.48 -8.72 870 2.1 1.6 9.0 17 360 <20 <20 <20 <2,000 11/01/01 13.52 -9.76 760 3.5 <0.5 5.8 9.2 600 <1.0 0.0 4.6 <100 01128102 12.00 -6.24 560 5.9 0.87 4.6 4.5 590 <0.5 <0.5 3.8 <5.0 04/23/02 12.09 -8.33 220 0.91 <0.3 3.4 4.4 540 <5.0 <5,0 <5.0 1,800 07129/02 4.6711 13.02 -8.35 170 0.39 0.39 1.4 3.0 300 <5.0 <5.0 10 <50 10/07102 13.90 -9.23 250 <0.30 0.30 0.85 0.82 220 <5.0 <5.0 <5.0 <50 01102103 13.36 -8.69 150PI <0.30 3.8 1.5 2.2 360 <5.0 <5.0 <5.0 <50 04/03103 13.06 -8.39 17014 <0.50 3.0 1.1 <1.0 280 <5.0 <5.0 <5.0 <50 i 07/21/03 13.72 -9.05 160 <0.50 1.9 <0.50 <1.0 240 <5.0 <5.0 <5.0 <50 10/13103 15:09 -10.42 <50 <0.50 0.84 <0.50 <1.0 22 <0.50 <0.50 <0.50 <5.0 <0.50 <0,50 MWA 07/29/02 4.80€'l 13.28 -8.48 <50 1.1 <0.3 <0.3 <0.6 14,000 <5.0 8.8 160 <50 10/07102 14.12 -9.32 <50 <0.30 <0.30 <0.30 <0.60 9,600 <5.0 <5.0 110 140 01102103 13.56 -8.76 <50 33 0.73 <0.30 1.1 14,000 <5.0 <5.0 <5.0- <50 04103103 13.35 -8.55 <50 <0.50 <0,50 <0.50 <1,0 12,000 <5.0 <5.0 200 <50 07121/03 13.93 -9.13 <50 <0.50 <0.50 <0.50 <1.0 14,000 <5.0 <5.0 250 <50 10/13103 14.70 -9.90 <50 <0.50 <0.50 <0.50 <1,0 9,900 <100 <100 <100 <1000 <100 <100 MW-5 07129!02 5.131'1 13.61 -8.48 <50 <0.3 0.9 <0.3 1.2 18,000 <25 <25 150 5,700 10/07/02 14.40 -9.27 <50 <0.30 0.42 <0.30 <0,60 29,000 <250 <250 <250 5,600 01102103 13.87 -8.74 <50 <0.30 0.38 <0.30 <0.60 41,000 <5.0 <5.0 230 12,000 04103103 13.61 -8.48 <50 <0.50 <0.50 <0.50 <1,0 29,000 <5.0 <5.0 370 540 07121103 14.25 -9.12 <50 <0.50 <0.50 <0.50 <1.0 1000 <5.0 <5.0 <5.0 41,000 10/13103 15.02 -9.89 <50 <0.50 <0.50 <0.50 <1.0 8,800 <100 <100 <100 <1000 <100 <100 ' ug/f Micrograms per liter D1PE Di-isopropyl ether ETBE Ethyl Cert-butyl ether MSL Mean sea level TPH Total petroleum hydrocarbons TAME Tert-amyl methyl ether bgs Below ground surface MtBE Methyl Cert-butyl ether TBA Tera butyl alcohol EDB 1,2-Dibromoethane 1,2-DCA 1,2-Dichloromethane trt Well casing elevations surveyed by Morrow Surveying on 712102. r4 Sample contained compounds in the gasoline range,but the chromatogram pattern was not consistent with the expected pattern. NIswDP12W3XS1880040.1A1112403m1 Page 2 of 2 Shaw Environmental,Inc. 1112412003