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r� OM Ta l Groundwater Elevations and 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 ETBE TAME TBA 1,2 DCA Identification Sampled MSL feet b s (MSL) u ll (ug/1) (ug/1) (U 11)( (U211) (U911) (u 11) (ug/1) (u 11) {u 11} EDB(ug/1) u 1IJ MW-4 07129102 480111 1328 -848 <50 11 <0 3 <0 3 <0 6 14,000 <5 0 88 160 <50 10107/02 1412 932 <50 <0 30 <0 30 <0 30 <0 60 9,600 <5 0 <5 0 110 140 01/02103 1356 876 <50 33 073 <0 30 1 1 14,000 <5 0 <50 <50 <50 04103!03 1335 -855 <50 <0 50 <0 50 <0 50 00 12,000 <50 <50 200 <50 07121/03 1393 913 <50 <0 50 <0 50 <0 50 <10 14,000 <50 <50 250 <50 10113/03 1470 990 <50 <0 50 <0 50 <0 50 <1 0 9,900 <100 <100 <100 <1000 <100 <100 01/12/04 1397 917 <50 28 <050 <0 50 <10 5,100 <0 50 <0 50 35 5,500 <0 50 <0 50 06/22/04 1376 -896 4101�1 43 092 <0 50 <10 790 <25 <25 <25 2,800 <25 <25 08112/04 1427 947 <50 12 <0 50 <0 50 <10 16 <0 50 <0 50 <0 50 1,100 <0 50 <0 50 10121/04 14 51 -971 <50 11 24 <0 50 <10 15 <0 50 <0 50 0 85 1,700 <0 50 <0 50 01/17/05 1342 862 <50 06 <0 50 <0 50 <10 1,1300 <0 50 <0 50 310 <500 <0 50 <050 G4/18/05 1203 -723 95 <0 50 <0 50 <0 50 <10 930 <10 <10 <10 <100 <10 <10 07/18105 1270 790 <50 26 <0 50 <0 50 <10 170 <50 <50 <50 1,300 <5 0 <50 10/17/05 1360 -880 <50 <0 50 058 <0 50 <10 13 <0 50 <0 50 <0 50 3,300 <0 50 <0 50 01/16/06 1241 -761 <50 <0 50 <0 50 <0 50 <10 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <0 50 MW-5 07/29/02 51311 1361 848 <50 <0 3 0 9 <0 3 12 18 000 <25 <25 150 5,70D 10107/02 1440 927 <50 <0 30 042 <0 30 <060 29,000 <250 <250 <250 5 60D 01/02/03 1387 874 <50 <0 30 038 <0 30 <060 41,000 <5 0 <5 0 230 12,000 04/03/03 13 61 848 <50 <0 50 <0 5D <0 50 <10 29 000 <50 <50 370 540 07/21/03 14 25 -912 <50 <0 50 <0 50 <0 50 <10 10 000 <5 0 <50 <5 0 41 000 10/13103 1502 -989 <50 <0 50 <0 50 <0 50 <1 0 8,800 <100 <100 <100 <1000 <100 <100 01/12104 1431 918 <50 <0 50 <0 5D <0 50 <10 1 300 <0 50 <0 50 15 19,000 <0 50 <0 50 06/22104 1410 897 6414 <0 50 098 <0 50 <10 36 <10 <10 <10 4,90D <10 <10 08/12104 1460 947 54x1 081 094 <0 50 <10 14 <0 50 <0 50 <0 50 180 <0 50 <0 50 10/21/04 1479 966 <50 <0 50 069 060 <10 380 <0 50 <0 50 35 6,500 <0 50 <0 50 01/17105 1370 857 <50 <0 50 <0 50 <0 50 <10 580 <25 <25 19 1,400 <2 5 <25 04118/05 1234 721 <50 <0 50 <0 50 <0 50 <1 0 540 <5 0 <50 <5 0 1,100 <5 0 <50 07/18105 1302 789 <50 <0 50 <0 5D <0 50 <10 12 <50 <50 <5 0 1200 <50 <50 10/17105 1388 875 <50 <0 50 <050 <0 50 <10 2,200 <0 50 <0 50 12 350 <0 50 <0 50 01/16/06 1270 757 <50 <0 50 <0 5D <0 50 <10 420 <0 50 <0 50 36 210 <0 50 <0 50 t U94 Micrograms per liter D1PE Di isopropyl ether ETBE Ethyl tert butyl ether MSL Mean sea level TPN Total petroleum hydrocarbons TAME Tert amyl methyl ether bgs Below ground surface MtBE Methyl fert butyl ether TBA Teri butyl alcohol EDB 1,2 Dibromoethane 12 DCA 12 Dichloromethane t'1 Welf casing elevations surveyed by Morrow Surveying on 712102 p1 Sample contained compounds in the gasoline range but the chromatogram pattern was not consistent with the expected pattern Shaw Environmental,Inc N 1TechPub%9OW401A Arco,2006 RptsVk1Qe6 tableTable 1 Page 4 of 4 Rev 0 41512006