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<br /> Groundwater Monitoring Data
<br /> ARCO Service Station No. 2168, 441 Charter Way, Stockton, California _
<br /> Well Elevation Stant Elevation
<br /> Sample of Top Water of Total
<br /> Number Date of Casing Level Groundwater TPHG Benzene Toluene Eth /benzene Xylenes MTBE Observations
<br /> MW-2
<br /> MW-2(53) 11/29/95 1083 3262 -2179 30,000 3,800 2,700 380 1,800 No FP, No S,Yes 0
<br /> MW-2 02/27/96 1083 2987 -1904 Well not sampled
<br /> MW-2(53) 05/15/96 1083 28 16 -17 33 16,000 2,600 1 000 210 910 <200** No FP,No 5,Yes 0
<br /> MW-3
<br /> W-39-MW-3 05/11/92 958 3905 -2947 65,000 13,000 3,000 1,800 8,300 No FP,No S,No 0
<br /> N1W-3(54) 08/24/92 958 4084 -3126 77,000 15,000 9,400 2,300 2,300 No FP,No S,No 0
<br /> MW-3(54) 12/17/92 958 4169 -32 11 67,000 12,000 5,500 2,100 7,200 No FP,No S,No 0
<br /> MW-3(54) 03/10/93 958 3954 -2996 51,000 16,000 1,300 1,800 4,900 No FP,No S,Yes 0
<br /> MW-3(54) 06/10/93 958 3742 -2784 44,000 12,000 2,100 1,800 3,200 No FP,No S Yes 0
<br /> MW-3(54) 09/02/93 958 3823 -2865 49,000 13,000 2,200 2,100 4,500 No FP,No S,Yes 0
<br /> MW-3(54) 10/28/93 958 3846 -2888 46,000 14 000 1,900 2000 4200 No FP,No S,Yes O
<br /> NIW-3(36) 03/23/93 958 3802 -2844 42,000 12,000 2,300 1,900 3,300 No FP,No S, Yes 0
<br /> N4W-3(36) 06/29/94 958 3783 -2825 44,000 14,000 5,300 I,800 5,500 No FP,No S,O=NE
<br /> MW-3(40) 09/26/94 959 3901 -2943 45,000 9,200 2,500 1,000 2,700 No FP,No S,O=NE
<br /> MW-3 12/01/94 958 3924 -2966 Well Not Sampled No FP,S=Yes,O=NE
<br /> MW-3(53) 02/16/95 958 3624 -2666 37,000 14,000 340 2,100 470 No FP,No S,O=NE
<br /> NIW-3(53) 05/17/95 958 3149 -2191 39,000 13,000 1,200 2,100 1,500 No FP,No S,O=NE
<br /> MW-3(53) 08/15/95 958 3106 -2148 31,000 11,000 220 1,800 910 No FP,No S,Yes 0
<br /> MW-3(53) 11/29/95 958 3125 -2167 41,000 10,000 350 1,900 860 No FP,No S,Yes 0
<br /> NIW-3 02/27/96 958 2851 -1893 36,000 10,000 510 1,800 990 No FP,No S,Yes 0
<br /> N1W-3(53) 05/15/96 958 2682 -1724 40,000 12,000 690 2,000 1,300 <500** No FP,No S, Yes 0
<br /> MW-4
<br /> MW4 01/20/93 1234 4435 -3201 NS NS NS NS NS No FP,No S,Yes 0
<br /> NIW4 01/26/93 1234 4399 -3165 NS NS NS NS NS No FP,No S,Yes 0
<br /> MW-4(59) 03/10/93 1234 4242 -3008 110,000 14,000 24,000 3,200 15,000 No FP,No S, Yes 0
<br /> MW-4(59) 06/10/93 1234 4068 -2934 110,000 9,100 17,000 2,700 13,000 No FP,No S,Yes 0
<br /> MW-4(59) 09/02/93 1234 4159 -2925 110,000 12,000 21,000 2,700 13,000 No FP,No S,Yes 0
<br /> MW-4(59) 10/28/93 1234 4178 -2944 90,000 1,100 20,000 2,700 13,000 No FP,No S,Yes 0
<br /> MW-4(38) 03/23/94 1234 41 23 -2889 38,000 7,600 12,000 2,000 10,000 No FP,No S,Yes 0
<br /> MW-4(38) 06/29/94 1234 4106 -2872 43,000 2,400 2,800 1,000 5,800 No FP,No S,O=NE
<br /> MW-4(43) 09/26/94 1234 4226 -2992 60,000 4,600 7,400 1,300 6,000 No FP,No S,O=NE 1
<br /> N\1LS\0805U 4607\16199651 }CLS Revision 2 7/30/96
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