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i i • Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N Et_ Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPH9 TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (ug/L) (/ag/L) (pg/L) (pg/L) (pg/L) (pg/L) (Erg/L) (mg/L) Comments MW-3 6/20/2001 - 1610 3990 -2380 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] -- 9/12/2001 - 1610 4419 -2809 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] -- 12/12/2001 - 1610 4090 -2480 <50 -- <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] -- 3/13/2002 1610 3800 -2190 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 6/18/2002 - 1610 4027 -2417 <50 - <0 50 <050 <0 50 <0 50 <0 50[2] 9/11/2002 - 1610 4544 -2934 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[2] - 12/18/2002 - 1610 4267 -2657 <50 - <0 50 <050 <0 50 <0 50 <0 50[2] -- 03/06/2003 P 1610 4035 -2425 <50 - <0 50 <0 50 <0 50 <0 50 0 68[2] 257 06/11/2003 P 1610 3981 -2371 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] 318 09/2312003 P 1610 4378 -2768 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 12/0912003 P 1610 4270 -2660 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] - 03/09/2004 P 1610 4038 -2428 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] 121 MW-4 8/10/1992 - 1457 6434 4977 NA NA NA NA NA NA - No FP,No S 8/28/1992 - -- -- - 1,200 -- 310 270 23 140 NA - No FP,No S 9/15/1992 - 1457 6445 4988 NA - NA NA NA NA NA - No FP, No S 10/6/1992 -- 1457 6460 5003 260 - 26 35 <0 5 22 NA -- No FP, No S 11/11/1992 1457 6387 4940 NA - NA NA NA NA NA -- No FP,No S 12/4/1992 - 1457 6312 4855 NA -- NA NA NA NA NA - No FP,No S 1/20/1993 -- 1457 6183 4726 820 -- 160 69 <5. 71 NA - No FP, No S 3/2211993 -- 1457 5995 4538 NA -- NA NA NA NA NA No FP,No S 4/6/1993 - 1457 5944 4487 1 000 - 250 26 <2 5 120 NA - No FP, No S 7/30/1993 -- 1457 6023 4566 880 -- 220 50 45 68 NA - No FP,No S 11/29/1993 - 1457 -- -- - _ - __ - - -- Well Inaccessible No FP, No S 3/23/1994 -- 1457 5429 3972 580 97 17 43 29 NA -- No FP No S 6/22/1994 -- 1457 5441 3984 1 700 - 930 44 52 20 NA -- No FP,No S 9/28/1994 - 1457 5826 4369 610 - 73 22 1 3 18 NA -- No FP,No S 12/1/1994 - 1457 5718 4261 1 000 400 31 59 15 NA -- No FP,No S 2/28/1995 - j 1457 5427 -3970 <50 - 09 <05 <05 <0 5 NA -- No FP,No S 5/19/1995 - 1457 5238 -3781 <50 - <0 5 <05 <0 5 <0 5 NA -- No FP,No S 8/28/1995 - 1457 5410 -3953 <50 - <05 <05 <0 5 <0 5 NA -- No FP,No S 12/7/1995 - 1457 5269 -3812 <50 - <0 5 <0 5 <0 5 <0 5 NA - No FP No S 2/5/1996 -- 1457 5012 -3555 <50 - <05 <0 5 <0 5 <0 5 NA -- No FP,No S Report Date May 12,2004 Page 7 of 19