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• Groundwater Monitoring d Analytical Results Chevron Service Station#9-1848 1257 Yosemite Avenue Vertical Measurements are in feet Manteca,California Analytical Results are in parts per billion(ppb) Well Ground Depth Total DATE Head Water To Notes TPH- TPH- Benzene Toluene Ethyl- Xylenes MTBE Oil& Elev Elev Water Diesel Gasoline Benzene Grease C-1 07/29/91 27 62 1033 1729 - 1100 92 29 3 8 35 - 10/29/91 2762 1051 17 11 -- -- 320 42 0 8 3 3 4 3 01/24/92 2762 1197 1565 - - 280 8 8 <0 5 17 2 1 - - 04/17/92 2762 12 20 1542 -- -- 360 9 0 <0 5 58 0 5 10/07/92 2762 946 1816 -- -- 410 37 10 5 6 10 -- 11/17/92 2762 1036 1726 -- -- 71 75 <0 5 2 8 0 7 - 02/20/93 27 62 1340 1422 -- -- 200 14 <0 5 4 2 1 5 05/19/93 2762 1249 1513 -- -- 580 16 15 25 3 3 - - 08/26/93 2762 890 1872 -- -- 190 43 13 3 8 <1 5 - 11/22/93 2762 11 17 1645 -- -- <50 23 <05 21 <0 5 - - 02/02/94 27 62 1290 1472 -- -- 1000 27 6 1 64 47 - - 05/10/94 2762 1269 1493 -- -- 150 21 2 0 1 8 0 6 - 08/16/94 27 62 869 18 93 -- - 540 4 2 29 3 8 61 11/10/94 2762 1142 16 20 -- 340 9 8 3 3 22 27 - 02/24/95 2762 1372 1390 -- -- <50 <0 5 <0 5 <0 5 <0 5 - - 05/16/95 2762 1412 1350 -- -- 130 17 0 5 7 1 14 - -- 08/25/95 27 62 982 1780 -- -- 300 2 1 0 6 4 4 27 12/01/95 2736 1064 1672 -- - 300 10 <0 5 17 2 2 02/07/96 2736 t2 82 1454 -- - 100 10 <0 5 0 5 <0 5 -- 05/10/96 -05/10/96 2736 1236 1500 -- -- 130 <0 5 <0 5 5 8 <0 5 6 8 08/22/96 2736 958 1778 -- -- <500 <5 0 <5 0 <5 0 <5 0 <50 - 11/06/96 2736 116 1572 -- - 470 15 16 5 4 23 5 8 - 02/28/97 2736 14 04 1332 - - <50 <0 5 <0 5 <0 5 <0 5 <5 0 05/21/97 2736 13 64 1372 -- -- 880 4 6 0 6 81 33 7 8 05/21/97 2736 13 64 1372 Confirmation run - -- -- -- -- -- 7 6 " 08/26/97 2736 11 50 1596 -- -- 140 <0 5 <0 5 056 <0 5 64 -- 9-1848 xis/#386392 1 As of 05/18/00