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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N El_ Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (gg1L) MIL) WWI-) MAL) (pg1L) (ug/L) ( 91L) (mg/L) Comments MW-8 3/23/1994 – 1416 5361 3945 340 – 57 66 93 42 NA – No FP,No S 6/22/1994 – 1416 5375 3959 <10 – <03 <0 3 <0 3 <0 3 NA – No FP,No S 9/28/1994 -- 1416 5741 4325 <50 – <0 5 <0 5 <0 5 <0 5 NA – No FP,No S 12/1/1994 – 1416 5312 3896 60 – 27 13 08 13 NA -- No FP,No S 2/28/1995 – 1416 5354 -3938 <50 – <05 1 3 <0 5 <0 5 NA – No FP,No S 5/19/1995 – 1416 5166 -3750 55*** – <0 5 <0 5 <0 5 <0 5 NA – No FP,No S 8/28/1995 -- 1416 5334 -3918 <50 -- <05 <05 <0 5 <0 5 NA – No FP,No S 12!711995 -- 1416 5202 -3786 <50 – <05 <05 <0 5 <0 5 NA – No FP,No S 2/5/1996 -- 1416 -- -- -- -- -- – – – – – Not Sampled[1) 5/30/1996 -- 1416 -- -- -- – -- -- -- -- -- -- Not Sampled[1] 7/28/1996 -- 1416 – - – -- -- -- -- Well Destroyed MW-10 11/29/1993 -- 1438 5930 4492 1,000 – <11** <3*' <1* 1 NA -- No FP,No S 3/23/1994 – 1438 5436 3998 1,300 – 66 61 16 36 NA – No FP,No S 6/22/1994 – 1438 5435 3997 1,600 – 5 15 33 55 NA -- No FP,No S 9/28/1994 – 1438 5811 4367 NA – NA NA NA NA NA – No FP,No S 9/29/1994 – -- – -- 1,100 - <0 5 <0 5 3 6 4 NA -- No FP,No S 12/1/1994 -- 1438 5715 4277 800 – <0 5 23 0 8 1 3 NA – No FP,No S 2128/1995 – 1438 5424 -3986 300 – 09 <0 5 <0 5 <0 5 NA – No FP,No S 5/19/1995 -- 1438 5232 -3794 370 – 09 <0 5 <0 5 <0 5 NA – No FP,No S 8/28/1995 -- 1438 5370 -3932 420 – 12 <0 5 <0 5 <0 5 NA – No FP,No S 12f1/1995 -- 1438 5261 -3823 490 -- 0 7 <0 5 <0 5 <0 5 NA -- No FP,No S 2/5/1996 – 1438 5013 -3575 350 – 0 7 <0 5 <0 5 <0 5 NA – No FP,No S 5/30/1996 -- 1438 4709 -3271 350*** -- <6** <0 5 <05 <0 5 <6** – No FP,No S 9/18/1996 -- 1438 5084 -3646 510 -- <15** 1 <0 5 <0 5 <9** – No FP No S 11/26/1996 -- 1438 4872 -3434 <600*** – <05 <0 5 <05 <0 5 <10** -- No FP,No S 3/24/1997 -- 1438 4377 -2939 <500— -- <5'* <0 8*' <05 <0 5 <7** – No FP,No S 5/20/1997 -- 1438 4420 -2982 460 -- <5** <0 5 <0 5 <0 5 <7*' -- No FP,No S 8/19/1997 – 1438 4766 -3328 440 -- <05 <0 5 <05 <05 <5 -- INo FP,No S 11/19/1997 – 1438 4595 -3157 510 – 22 22 093 31 <5 -- 3/4/1998 – 1438 4143 -2705 110 -- 066 <0 5 <0 5 <0 5 <5 – No FP,No S 6/26/1998 -- 1438 3911 -2473 329 -- 475 <0 5 <0 5 <0 5 <5 – 9/1/1998 – 1438 4078 -2640 295 – <05 <0 5 <0 5 <0 5 <5 – 12/2/1998 -- 1438 3823 -23 85 407 – 689 <05 <0 5 .0873 195 -- Report Date January 31,2005 Page 15 of 22