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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING USING EPA METHOD W20A BP OIL COMPANY SERVICE STA7ION NO.11195 16500 SOUTH INTERSTATE 5,LATHROP,CALIFORNIA ALISTO PROJECT NO.10-151 WELL DATE OF CASING DEPTHTO GROUNDWATER TPH-G TPH-0 B T E X MTBE TOG HVOCs DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (VGA) (u 3A} (UEO) (ugA) 094) (ugA) (UGA) (ugA) NO (Ppm} MONITORING (Feet) (Feat) (Feet) MW-5 12!21!92 10.70 12.74 -2.04 ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - •- PACE ! MW-5 05117M 10.70 9.94 0.76 ND<50 110 NO<0.5 ND<0.5 ND<0.5 ND<7.0 - ND<S.o ND PACE MW-5 09115/93 10.70 11.31 -0.61 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 NO<0.5 - -- PACE MW-5 01112/94 10.70 12.07 -1.37 ND<50 80 ND<0.5 ND<05 NO<0.5 ND<03 - ND<5000 ND (Q 4.5 PACE MW-5 05!12/94 10.70 11.36 -0.66 N0<50 80 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - NO<5000 ND 4-5 PACE MW-5 10/07194 10.70 12.15 •1.45 NO<50 260 ND<0,5 ND<V.S ND<0.5 ND<o.5 -• ND<5o00 ND (I) 4.4 PACE MW-5 12/08/94 10.70 12.32 -1.62 ND<50 250 NDeoz ND<0.5 ND<0.5 ND<0.5 -- ND<5000 NO 4.5 PACE MW-5 02121x95 10.70 10.01 0.69 ND<5o ND<50 ND<0,50 ND<o So ND<0.50 ND<i,o - 110 ND (1) 7.8 ATI MW-5 06109!95 10.70 9.49 1.21 ••• ... ... „- --- „, - _- -_ •_ - MW-5 DEV31/95 10.70 11.39 -0.69 ND<50 230 ND4.50 ND<0.50 ND<0.50 ND<1.0 ND<5.08.2 ATI MW-5 11/02/95 10,70 11.99 -1.29 •-• -- ._. MW-5 02126!96 10.70 8.53 2.17 ND<50 70 ND<0.5 ND<1 ND<t 190<1 ND.10 - -- 9.6 SPL MW-5 09!05/96 1070 10.73 -0.03 ND<50 ND<50 ND<0.5 ND<1,0 ND0.0 ND<1,0 ND<10 --- - 8,9 SPL MW-5 03/28/97 10.70 7.71 2.99 ND<50 ND<100 NI?<0.5 ND<7.0 ND<1,o ND<1.o ND<10 -- -- 7,7 SPL MW-5 10/15/97 10.70 12.28 •1,58 2200 - ND<2.5 ND<5.0 ND<5.0 ND<5.0 93000 62 SPL MW-5 01/15/96 10,70 10.98 -0.28 3600 -- ND<0.5 NO<1.0 ND<1.o ND<1.0 33000 --- -- 5.4 SPL MW-5 05/07/98 10.70 8.02 2.68 --- ._ .._ _. - •„ --- --- - - MW-5 09103x98 10.70 1028 0.42 13000 --- ND<0.5 ND<1.0 ND<1,0 ND<1.0 8000 ... - 5.8 SPL MW-6 09115!93 626 6,98 -0.72 400 2.4 ND<0.5 ND<0.5 ND<0.5 -- -- -- •-- PACE MW-6 01/12/94 8.26 9.62 -1.35 570 -- NO<0.5 ND<0.5 ND<0.5 N04.5 6700 (d) --- -- 4.1 PACE MW-6 05/12194 8.26 8.95 -0.69 5500 --- NO<0.5 ND<0.5 ND<0.5 ND<0.5 12000 (d) --- - 4.2 PACE MW-6 10/07/94 826 9,72 -1.46 ND<50 --- ND<0.5 ND<0.5 ND<D,5 ND<0.5 -- -- -- 4.3 PACE MW-6 12106!94 826 9.68 -1,62 300 ND<0.5 ND<0.5 NO4.5 ND4.5 -- - 4.6 PACE MW{i 02/21/96 6.26 7.60 0.66 990 ND<0.50 ND<0.50 ND<0.50 ND<1.0 (c) -- -- 8.0 ATI MW-6 06/09/95 6.26 7.12 1.14 MW-6 06/31/95 8.26 6,95 -0.69 99 --- ND<0,50 ND<0.50 ND<o.50 ND<1.0 1900 ... - 8.1 ATI MW-6 11/02/95 626 9.50 •1.24 -- MW-6 02126!96 826 6.19 2.07 90 - ND<D.5 ND<4 ND<1 ND<1 1400 -- --- 8.2 SPL MW-6 09/05/96 8.26 8.49 •0.23 ND<50 ND<0.5 ND<1.0 ND<1.0 ND<1.0 40 --- -- 8.7 SPL MWi 03/25/97 8.26 5.67 2.59 ND<50 - NO<0.5 ND<1.0 ND<1.0 1900.0 ND<io - 7.4 SPL MW-6 10/15/97 8,26 9.79 -1.53 ND<50 --- ND<0.50 ND<1.0 ND<1.0 ND<1.0 920 --- -- 5.7 SPL mw-6 01/15x98 8.26 8.71 -0.45 ND-1200 ND400 ND<0.5 ND0.0 ND<1.0 ND<1.0 620 -- - 5.1 SPL MW-6 05107198 826 5.58 2.68 1500 --- ND<05 ND<1,0 NO<1.0 ND<1.0 2300 --- •- 5.1 SPL MW-6 09103198 8.26 7.77 0.49 NN50 -- ND<0.5 ND<1.0 ND<1.o ND<1.0 17 --- --- 6.2 SPL 17-Nov-96 Page 3