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Table 9 C-Sparge System Pilot Test Groundwater Chemical Analytical Data Former Unocal Service Station#0187 437 East Miner Avenue, Stockton Sample 00 TPHg Benzene Toluene Ethylbenzene Xylenes NitBE Well ID Date (p m) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) NP-1-111 11120-22/001'1 - 210j'1 11.8 2.55 0.612 1.83 <5.00/<2.00131 12/07/0011 ---- 260121 12.9 0.666 0.585 <0.500 -- Baseline 1218/00 3.35 170 4.8 <0.50 <0.50 0.86 4.1 12/19/00 5.27 180 3.4 0.69 <0.50 2.1 3.3 12/26/00 3.86 80.0 2.50 <0.500 <0.500 <0.500 <2.50 01/02/01 ---- 116 3.55 <0.500 <0.500 <0.500 <2.50 01/09/01 7.08 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 01/16/01 4.14 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 01/23/01 4.24 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 01/30/01 2.76 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 02/06/01 3.44 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 02/13/01 4.30 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 02/21/01 4.04 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 2126-27/01111 - <50.0 <0.500 <0.500 <0.500 <0.500 <2.50/<2A131 03/06/01 4.82 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 03/13/01 3.29 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 03/27/01 3.76 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 04/10/01 4.32 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 04/24/01 5.50 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 05/08/01 4.97 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 5114-16/011x1 ---- <50.0 <0.500 0.654 <0.500 1.22 <5.00/<2.00131 05/22/01 2.22 <50.0 <0.500 <0.500 <0.500 .948 <2.50 06/05/01 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 06/19/01 3.82 <50 <0.50 <0.50 <0.50 <0.50 <2.5 07/03/01 4.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 07/17/01 3.56 <500 <5.0 <5.0 <5.0 <5.0 47 07/31101 - <50 <0.50 <0.50 <0.50 <0.50 <2.5 08113-151011'1 - <50 <0.50 1.1 <0.50 1.6 <501<2.0t31 11126-281011'1 --- <50 <0.50 1.5 0.53 2.7 <5.01<l.0131 02125-27102111 - <50 0.73 1.4 0.67 2.7 <5.01<1-0131 06940-325 5 ENSR Corporation