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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 DO TPHg Benzene Toluene Ethylbenzene Xylenes MTBE Well ID Date (ppm) (ppb) (ppb) (ppb) (ppb) (pb) ( b) NP-1-111 07/03/01 4.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 (Cont.) 07/17/01 3.56 <500 <5.0 <5.0 <5.0 <5.0 47 07/31/01 -- <50 <0.50 <0.50 <0.50 <0.50 <2.5 08/13-151011'1 ---- <50 <0.50 1.1 <0.50 1.6 <50/<2.0131 11/26-28/01111 <50 <0.50 1.5 0.53 2.7 <5.0/<1.0131 02/25-27/02111 -- <50 0.73 1.4 0.67 2.7 <5.0/<1.0131 05/07-09/02111 ---- <50 <0.50 <0.50 <0.50 <0.50 <5.0/<l.0131 05/21/02 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 06/19/02 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 07/19/02 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 08112-14/02f1 ---- <50 <0.50 <0.50 <0.50 0.73 <2.5/<1.0131 08/22/02 --- 53161 20 0.92 <0.50 0.69 <2.5 09/20/02 --- <50 <0.50 <0.50 <0.50 1.0 <2.5 10/21/02 --- <50 <0.50 <0.50 <0.50 1.0 <2.5 11105-061021'1 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5/<2.0131 11/21/02 -- <50 <0.50 <0.50 <0.50 <0.50 <2.5 12/18/02 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.0 01/23/03 --- <50 <0.50 <0.50 <0.50 <0.50 <2.0 02104-061031'1 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.0/<2.0131 03/21/03 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.0 04/22/03 ---- <50 <0.50 <0.50 <0.50 1.1 <2.0 05/20/03 --- 110 24 1.5 0.74 17 <2.0 5/27-301031'1 <50 <0.50 <0.50 <0.50 <0.50 <2.01<0.50131 06/20/03 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.0 07/22/03 --- <50 <0.50 <0.50 <0.50 <0.50 <2.0 08/22/03 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.0 8126-291031'1 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.01<0.50131 09/18/03 ---- <50 <0.50 <0.50 <0.50 <0.50 <0.50 10/16/03 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.0 12/02/03 8.6 <50 <0.50 <0.50 <0.50 <1.00 <0.50131 0694_ i ENSFOoration