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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING USING EPA METHOD 8020A BP OIL COMPANY SERVICE STATION NO.11495 16500 SOUTH INTERSTATE 5,LATHROP,CALIFORNIA ALIS70 PROJECT NO 10-151 WELL DATE OF CASING DEPTHTO GROUNDWATER TPH-G TPH•D B T E X MTBE TOG HVOCs DO B ID LASAMPLING! ELEVATION (a) WATER ELEVATION (b) (u90) 01 (ug4) (ugA) (UgA) (ugA) {ugA} (ugA) (ugA) {ppm) MONITORING (Feet) (Feet) (Feet) MW-3 12/21/92 9.79 11.84 -2.05 1300 - 6.7 3.1 9.1 310 - PACE MW13 05/17/93 9.79 9.05 0.74 3600 - 20 9.3 470 700 - - -- PACE OC-1(e) 05/17/93 -- -- 4000 -- 23 12 520 810 - - PACE MW-3 09/15/33 9.79 10.44 -0.65 38000 - T70 34 1700 3300 - --- - PACE MW-3 01112!94 9.79 11.15 -1.36 360 - ND<0. 5 ND<0.5 ND<0.5 ND<0.5 1400 (d} --- - 5.3 PACE OC-1(e) 01712194 --- --- -_ 400 -- N0<O.5 ND<0.5 ND<0.5 ND<0.5 -- •- PACE MW-3 05/12194 9.79 10.45 -0.66 180 ••- 07 ND<0.5 4.3 4.2 270 (d) •-• - 4.4 PACE OC-1(e) 05112!94 --- -- --- 170 --- 0.7 ND<OS 3.8 3.9 -- --- - - PACE MW-3 10/07194 9.79 11.21 -1.42 120 --- ND<o.5 ND<0,5 N9<0.5 ND<0.5 4.3 PACE 00-1(e) 10/07/94 --- - - ND<50 --- 0.7 ND<0.5 ND<o.5 ND<0.5 •-• - -- PACE MW-3 12108/94 9.79 11.40 •1.61 470 --- 1.1 1.0 ND<o.5 9.0 89 OC-1(e) 12104 -- 4.6 PACE 460 - 0.7 1.1 N04.5 5,9 - - PACE MW-3 02/21/95 9.79 9.11 066 4900 --- 6.4 ND<5,o 370 400 (c) •-• - 8.2 ATI MW-3 06/09/95 9.79 8.59 1.20 --- --- --- _ _ MW3 08/31/95 9.79 10.46 -0.67 5500 --- 11 ND<5,0 690 460 4300 --- - 8.0 AFI MW-3 1110295 9.79 11.05 -1.26 -- - _ -- MW-3 02128!96 9.79 7.66 2.13 1600 -- 3.2 ND<1 270 227 1200 ... 6.0 SPL OC-1(®) 02/26796 -- •• 1400 2.8 ND<1 240 204 1100 - - SPL MW-3 09105/96 9.79 9.99 •0.20 3700 --- ND-12 ND<25 420 ND<25 2100 --- 7.7 SPL MVJ-3 03125/97 9.79 7.18 2.61 5300 - 16 ND<25 ND<25 ND<25 7400 7.2 SPL OC-1(e) 03125/97 --- -- 5400 -- NO<12 NDQ5 NDQ5 1%0Q5 7200 - --- SPL MW-3 10/15/97 9.79 11.32 -1.53 1500 --- 9.1 23 320 73.5 87005.3 SPL OC-1(e) 10/15/97 --• --- ••• 1400 --- 8.4 1.5 250 57 7900 --- -- SPL MW-3 01!1596 9.79 10.14 0.35 24000 --- 20 ND-10 NO<10 ND<10 210004.8 SPL MW-3 05/07/98 9.79 7.10 2.69 --- _- --- MW-3 09/03/96 9.79 9.32 0.47 81000 --- ND-2.5 NO<5.0 360 100 78000 -- --- 6.3 SPL OC-1(e) 09/03196 -- --- •-- 66000 - ND<5 ND<10 350 100 73000 - SPL MW-4 12121192 9.03 11.06 -2.03 10000 ND<5 ND<2.5 315 300 540 - ND<50 NO (I} - PACE MW-4 05/17/93 9.03 6.25 0.78 6600 --- 7.7 3,3 840 1000 --- -- •-• - PACE MW-0 09/15/93 9.03 9.64 -0.61 16000 - ND<12 ND<12 1000 1300 -- PACE OC-1(e) 09/15/93 --• -- - 16000 -- 16 ND02 1000 1200 - -- - - PACE MW-4 01/12/94 9,03 10.38 -1.35 3200 »• 6.2 1.4 ISO 112 -- -- - 4.8 PACE MW-0 05/12194 9.03 9.70 0.67 160 - ND<0-5 2.5 0.7 NO<0.5 - - 5.0 PACE MVV-4 IO/D7/34 9.03 1OAS •1.43 13000 --- 11 2.1 1100 33 -- -- - 4,8 PACE MW-4 12/08194 9.03 10.62 .1.59 5400 --- 20 27 490 54 - -- ••• 5.3 PACE MW-4 02/21195 9.03 8.29 0.74 11000 --- ND<25 ND<25 990 460 -- - -- 7,7 ATI OC-1(e) 021.21195 - - -- 11000 -- ND<10 ND00 990 450 -- -- •-• -- ATI MW-4 06/09/95 9.03 7.79 1,24 88 -- ND<0.50 ND<0.50 ND<0.50 ND<1.o -- -•- - 4.6 ATI OC-1(e) 06/09/95 -- 810 --- NDm.So 0.52 22 2.5 - -- -- - ATI MW-4 08/31/95 903 9.73 -0.70 2500 ••- N0<13 ND<13 130 14 NO<130 --- ... 7.6 ATI UC-1(v) 06/31135 --- --- --- 2dD0 --- ND.13 NO,13 160 17 ND.130 --• --- ATI MWA 11102!95 9,03 10.30 -1.27 1800 1100 ND<0.50 ND<0.50 56 3.6 NO<50 - 4.5 ATI QC-1(e) 11702/95 --- -. -- 1300 -- ND<1.o NO<1.0 38 2.7 ND<10 --- -- ATI MW-4 02/26196 9.03 6.87 2.16 2700 -- 2.6 1 220 75 ND<70 -- --- 8.0 SPL MW-4 09/05196 9.03 9.19 -0.16 530 --- N0<0.5 ND<1-0 ND<7.0 ND<1.0 ND<10 --- -- 7.9 SPL OC-1(e) 09/05196 -- - - 110 - ND4.5 ND<1.0 N00.0 ND<7.0 ND<10 - - SPL MW-4 03/25/97 9.03 6.40 2.63 590 - ND<o,5 ND<1.0 1.3 ND<1,0 ND<10 •- - 7,3 SPL MWA 10/15/97 9.0 10.59 -1.56 1600 - 3.6 NO<10 ND<1.0 ND<1.0 60000 --- - 6.5 SPL MW-4 01/15/98 9.03 9.37 -0.34 19000 7.3 ND410 NO<l0 ND<10 18000 --- -- 5.6 SPL 00-1(e} 05/07/98 -- -- -- 19000 - 6.6 ND<7o ND<10 ND<10 18000 -- - - SPL MWA 05/07/98 903 6.30 2.73 1100 - ND<0.5 ND<1,o ND<1.0 ND<1.0 1100 - - - SPL MW-4 09/03/98 9.03 6.58 0.45 2400 - ND<0.5 ND<1.0 2.8 ND<1.0 680 - - 6.2 SP1_ 17-Nov-98 Page 2