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• i • 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 PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg1L) (pg1L) (pglL) (pg/L) (lrglL) (mg/L) Comments MW-7 9/28/2000 – 1416 41 02 -2686 <50 – <05 <0 5 <0 5 <05 <2[2] -- 12/19/2000 -- 1416 3663 -2247 <50 <05 <0 5 c0 5i <05 <2 5 – 3/15/2001 – 1416 3450 -2034 <50 – <2[4] <2[4] <2[4] <2[4] <2[2] -- 6/20/2001 -- 1416 3779 -2363 <50 – <2[4] <2[4] <2[4] <2[4] <2[2] – 9/12/2001 -- 1416 4200 -2784 <50 – <2[4] <2[4] <2[4] <2[4] <2[2] – 12112/2001 – 1416 3885 -2469 <50 – <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] – 3/13/2002 -- 1416 3593 -21 77 <50 – <0 50 <0 50 <050 <0 50 <0 50[2] -- 6/18/2002 – 1416 3818 -2402 <50 – <0 50 <0 50 <0 50 <0 50 <0 50(2] – 9/11/2002 -- 1416 4328 -2912 <50 – <0 50 <0 50 <0 50 <0 50 <0 50[2] – 12/18/2002 -- 1416 4070 -2654 <50 – <0 50 <0 50 <0 50 <0 50 <0 50[2] – 03/06/2003 P 1416 3831 -24 115 <50 – <050 <0 50 <0 50 <0 50 <0 50[2] 456 06/11/2003 P 1416 3755 -2339 <50 – <0 50 <0 50 <0 50 <0 50 <0 50[2] 1 97 09/23/2003 P 1416 4157 -2741 <50 – <0 50 <0 50 <0 50 <0 50 <0 50[2] – 12/09/2003 P 1416 4075 -2659 <50 – <050 <0 50 <0 50 <0 50 <0 50[2] – 03/0912004 P 1416 3838 -2422 67 – <050 <0 50 <0 50 <0 50 <0 50[2] 145 06/23/2004 1 P 1416 4349 -2933 <50 - 079 <0 50 <0 50 061 <0 50[2] 303 09120/20041 P j 1416 1 4729 4313 <50 -- <050 <0 50 <0 50 <0 5o <0 50[2] 392 MW-8 11/29/1993 – 1416 5886 4440 69 – <05 <0 5 <0 5 <0 5 NA -- No FP,No S 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 <05 <0 5 <0 5 NA -- No FP,No S 12/1/1994 – 1416 5312 3896 60 – 27 13 0 8 13 NA -- No FP,No S 2/28/1995 – 1416 5354 -3938 <50 – <0 5 13 <0 5 <0 5 NA -- No FP No S 5/19/1995 - 1416 5166 -3750 55— – <0 5 <05 <0 5 <0 5 NA – No FP,No S 8/28/1995 – 1416 5334 -3918 <50 – <0 5 <05 <0 5 <0 5 NA – No FP,No S 1217/1995 – 1416 5202 -3786 <50 - <0 5 <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 – INo FP,No S Report Date October 25,2004 Page 14 of 21