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r rr r Illlr Illr Illlr Ir Illr Illr Illll• Illr Illlr Illlr Illlr r r r Illlr Illr • i ! 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 m) ( b) ( b) (ppb) (p b) ( b) (Ppb)-- 03/21/03 - <50 <0.50 <0.50 <0.50 <0.50 <2.0 U-3 04/22/03 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.0 (Cont.) 05/20103 - 190 39 3.1 2.0 30 <2.0 05127-30103191 ---- 150 1.2 <0.50 <0.50 0.74 <2.0/<0.50131 06/20/03 - <50 1.5 <0.50 <0.50 <0.50 <2.0 07/22/03 - 230 1.8 0.59 1.7 2.3 <2.0 08/22/03 -- 550 5.4 3.3 5.3 3.0 <2.0 8126-29/03111 - 350 4.3 2.0 2.4 2.6 <2.01<0.5013) 09/18/03 - 5301" 2.0 1.0 2.7 0.59 <0.50 10/16/03 ---- 760(61 3.2 1.9 6.8 2.0 <2.0 11/28/03 7.4 760 9.5 3.9 11.0 7.5 <0.5013) 02/17/04 0.85 19,000 3,400 360 710 3,100 <0.50131 04/19/04 2,500 340 30 120 210 <1.04 05/20/04 2,000 130 25 51 74 -- 08/16104 5,600 1200 62 210 840 <0.5013) U-10 1 Baseline 11120-221001') ---- 383121 57.9 0.738 1.90 1.42 <5.00/<2.001'1 02126-271011' ---- 334 30.4 <0.500 0.852 <0.500 <2.50/<2,0131 05114-16/01191 - 261121 22.7 <0.500 <0.500 <0.500 <5.00/<2.00131 08113-15/01191 - 360151 33 1.1 <0.50 <0.50 <5.01<2.0131 11126-281011" --- 160121 17 0.51 <0.50 <0.50 <5.01<1.0131 02125-27/02191 -- 280151 29 0.69 <0.50 <0.50 <5.01<1.0131 05107-09102111 130141 13 1.4 <0.50 1.2 <5.0/<1.0131 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 8112-14102111 - 180 25 0.81 <0.50 0.69 <2.5/<1,0131 08/22/02 -- <50 <0.50 <0.50 <0.50 <0.50 <2.5 09/20/02 --- <50 <0.50 <0.50 <0.50 <0.50 <2.5 10/21/02 - <50 <0.50 <0.50 <0.50 <0.50 <2.5 1'1105-0610219) - 50 1.9 <0.50 <0.50 <0.50 <2,51<2.013) 06940-325 13 ENSR Corporation