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Table 1 Groundwater Elevation and Analytical Data SP Oil Site No 11191 1469 West Hammer Lane, Stockton, CA WELL DATE OF P/NP CASING DEPTH TO PRODUCT GROUNDWATER GROUNDWATER TPHg B T E X MtBE DO ID SAMPLING/ ELEVATION WATER THICKNESS ELEVATION ELEVATION (ug//l) (ug1l) (ug/l) (ugll) (ug/1) (ug/1) (mg/L) MONITORING (Feet) (Feet) (Feet) (Feet) CHANGE (Feet) MW-1 1 002 -- 0 --- - -- --- -- 1/23/2002 --- 4663 --- -- 110 ND<1 0 ND<1 0 ND<1 0 10 110 4/11/2002 1917 4490 --- -2573 70 ND<1 0 ND<1 0 ND<1 0 ND<1 0 37 - 7/31/2002 P 1917 4941 -3024 230 ND<1 ND<1 ND<1 ND<1 9,300 184 10/11/2002 P 1917 5142 -- -3225 -201 10,000 42 530 250 190 10,000 MW-2 200 -- 4860 --- -- 800 ND<1 0 ND<1 0 ND<l 0- ND<1 0 1,900 - 1/10/2002 --- 4842 --- --- 1,400 ND<10 ND<10 ND<10 ND<10 1,800 - 4/11/2002 2047 4600 --- -2563 1 700 ND<1 0 ND<1 0 ND<1 0 ND<1 0 1,300 --- 7/31/2002 P 2047 5077 --- -3030 ND<50 ND<1 ND<1 ND<1 ND<1 4,500 99 10/11/2002 p 2047 5275 -3228 -198 9,200 ND<50 250 93 930 11,000 -- MW 3 2002 4780 --- 26,000 ND<1 0 ND<1 0 ND0 0 1qQ<1 0 27,000 - 4/11/2002 1974 4622 -- -2548 14,000 ND<1 0 ND<1 0 ND<1 0 ND<1 0 18,000 --- 7/31/2002 P 1974 4977 --- -3003 1,800 ND<1 ND<1 ND<1 ND<1 30,000 139 10/1112002 P 1974 5192 -3218 -215 26,000 ND<100 150 ND<100 540 44,000 --- 2002 --- 4898 --- 6,300 ND<1 0 ND<1 0 0<1 0 ND<1 0 9,40 --- 4/11/2002 2089 4646 -2557 22,000 ND<1 0 ND<1 0 ND<1 0 ND<1 0 11,000 - 7/31/2002 P 2089 5122 --- -3033 ND<50 ND<1 ND<1 ND<1 ND<1 1,900 168 10/11/2002 P 2089 5312 - -3223 •1 90 ND<2500 ND<25 ND<25 ND<25 ND<25 9,000 --- ABBREVIATIONS TPH-G Total petroleum hydrocarbons as gasoline B Benzene by 8260 T Toluene by 8260 E Ethylbenzene by 8260 X Total xylenes by 8260 MTBE Methyl tart butyl ether DO Dissolved oxygen ug/1 Micrograms per liter -- Not analyzed/applicable/measurable k W5 BP ARC011119110uarterlyl4 QTR 0211 1 191 40MR02