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APPENDIX D HISTORICAL GROUNDWATER ANALYTICAL DATA •� USA STATION#110 7 STOCKTON,CALIFORNIA WeII:ID. Date TPH G TPH D Benzene Toluene Ethyl- Xylene Total MTBE Sampled benzene Lead {ug/l) (n!(�) (ug/W 09/1) (u$11) (ug/1) ( ) (ug/1) MW-1P 09/29/92 ND(100) ND(10) ND(1.0) ND(I.0) ND(I.0) ND(].0) NA NA 09/15/93 170 ND(I.0) ND(I.0) 3.2 2.3 15 NA NA 03/07/94 300 ND(I.0) 2.8 8.4 5.1 30 NA NA 08/30/94 ND(50) ND(1.0) ND(0-5) ND(0.5) ND(0.5) ND(0.5) NA NA 12/08/94 ND(50) ND(0.4) ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA NA 03/22/95 ND(50) ND(0.4) ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND(0.001) NA 06/23/95 81 ND(0.4) ND(0-5) ND(0.5) ND(0.5) 1.1 ND(0.003) NA 10/10/95 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND(0.002) NA 01/18/96 ND(50) ND(0-05) ND(3.0) ND(3.0) ND(3.0) ND(3.0) ND(0.002) NA 04/26/96 ND(50) ND(0-05) ND(0-5) ND(0.5) ND(0.5) ND(0.5) ND(0.002) NA 07/19/96 ND(50) ND(0.05) ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND(0.003) ND(5.0) 10/30/96 ND(50) ND(0.05) ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND(0.002) ND(5.0) 01/24/97 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA NA 04/21/97 ND(50) NA ND(0.5) ND(0.5) ND(0.5) ND(0.5) NA ND(5.0) 07/30/97 ND(50) NA ND(0-5) ND(0.5) ND(0.5) ND(0.5) NA NA 10/31/97 ND(50) NA 1.1 ND(0.5) ND(0.5) ND(0.5) NA NA 01/22/98 ND(50) NA 2.2 1.3 0.51 0.92 NA NA 04/16/98 ND(50) NA 1.9 4.1 0.7 29 NA ND(5.0) 07/17/98 ND(50) NA 0.96 ND(0-5) ND(0.5) 0.55 NA ND(5.0) • 10/20/98 ND(50) NA 1.6 ND(0.5) ND(0.5) ND(6.5) NA ND(5.0) MW-2P 09/29/92 460 ND(I0) 3.3 ND(1.0) ND(1.0) ND(I.0) NA NA 09/15/93 510 ND(1.0) 11 1.8 ND(I.0) 4.9 NA NA 03/07/94 360 ND(I.0) 4.8 12 6.8 40 NA NA 08/30/94 560 ND(1.0) 4.1 1.0 1.0 ND(0.5) NA NA 12/08/94 430 ND(0.4) 26 1.9 7.5 1.7 NA NA 03/22/95 250 ND(0.4) 11 0.64 2.8 ND(0.5) ND(0.001) NA 06/23/95 1,700 ND(0.4) 98 6.0 45 3.5 ND(0.003) NA 10/10/95 530 ND(10) 51 4.1 24 3.0 ND(0.002) NA 01/18/96 780 ND(0.05) 98 6.8 35 5.1 ND(0.002) NA 04/26/96 1,000 ND(0.05) 120 7.5 48 13 ND(0.002) NA 07/19/96 190 ND(0.05) 13 1.7 3 1.5 ND(0.003) ND(5.0) 10/30/96 1,300 ND(0.05) 160 16 9.8 10 ND(0.002) ND(5.0) 01/24/97 930 NA 100 . 6.3 ND(0.5) 20 NA NA 04/21/97 3,300 NA 460 22 150 48 NA ND(5.0) 07/30/97 15,000 NA 350 ND(0.5) ND(0.5) ND(0.5) NA NA 10/31/97 1,000 NA 150 9 21 19 NA NA 01/22/98 2,500 NA 310 I9 51 49 NA NA 04/16/98 3,900 NA 750 28 130 10 NA 85 07/17/98 3,100 NA 490 16 140 30 NA ND(5.0) 10/20/98 3,700 NA 650 15 55 16 NA ND(5.0)