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<br /> Tate 1
<br /> Page 4 of 6
<br /> Groundwater Monitoring Data
<br /> Former ARCO Service Station No. 2168, 441 Charter Way, Stockton, California
<br /> well Elevation Static Elevation Top
<br /> Sample of Top Water of of Total
<br /> Number Date of Casing Level Groundwater Screen TPHG Benzene Toluene Eth lbenzene Xylenes MTBE[1] Observations
<br /> W-4
<br /> -4 08/22/96 1234 3072 -1838 79,000 9,200 11,000 1,800 7,400 X700** No FP,No S,Yes 0
<br /> MW-4 11/25/96 1234 3078 -1844 72,000 8,800 9,300 1,600 6,100 <500* No FP,No S,Yes 0
<br /> MW-4 02/24/97 1234 2682 -1448 40,000 6,700 2,200 900 2,600 <600** No FP,No 5,Yes O
<br /> MW-4 05/19/97 1234 2667 -1433 57,000 8,700 6,700 1,300 5,000 <600* No FP,No S,Yes 0
<br /> MW-4(38) 08/21/97 1234 2774 -1540 48,000 7,200 5,000 1,200 3,900 <1,000** No FP,No S,Yes 0
<br /> MW4(59) 11/17/97 1234 2879 -1645 12,000 4,800 180 370 280 <1,000** No FP,No S,Yes 0
<br /> W-5
<br /> MW-5 01/20/93 928 4112 -3184 370 NS NS NS NS NS NS No FP,No S,Yes 0
<br /> MW-5 01/26/93 929 4077 -3149 NS NS NS NS NS NS No FP,No S,Yes O
<br /> MW-5(55) 03/10/93 9 28 39 11 -29 83 49,000 9,200 6,600 830 4,200 NA No FP,No S,Yes 0
<br /> MW-5(55) 06/10/93 928 3734 -2806 37,000 6,400 4,100 $70 3,800 NA No FP,No S,Yes O
<br /> MW-5(55) 09/02/93 928 3823 -2895 51,000 7,900 6,600 990 4,800 NA No FP,No S,Yes 0
<br /> MW-5(55) 10/28/93 928 3846 -2918 60,000 9,200 9,000 1,200 6,700 NA No FP,No S,Yes 0
<br /> MW-5(36) 03/23/94 928 3797 -2869 58,000 9,000 8,900 940 5,600 NA No FP,No S,Yes 0
<br /> MW-5(36) 0629194 928 3779 -2851 50,000 7,300 7,500 920 4,700 NA No FP,S=NE,O=NE
<br /> MW-5(40) 09/26/94 928 3905 -2977 76,000 7,300 8,200 770 4,200 NA No FP,S=NE,O=NE
<br /> MW-5 12/01/94 928 3922 -2994 110,000 8,700 9,200 800 4,800 NA No FP,S=No,O=NE
<br /> MW-5(39) 02/16/95 928 3578 -2650 180,000 8,500 15,000 2,200 12,000 NA No FP,No S,O=NE
<br /> MW-5(55) 05/17/95 928 3123 -2195 22,000 3,400 2,100 390 2,400 NA No FP,No S,O=NE
<br /> MW-5(55) 08/15/95 928 3083 -2155 32,000 4,200 3,500 410 2,500 NA No FP,No S,Yes 0
<br /> MW-5(55) 11/29/95 928 3100 -2172 52,000 8,300 8,100 810 4,100 NA No FP,No S,Yes 0
<br /> MW-5 02/27/96 928 2819 -1891 20,000 3,200 1,900 440 1,800 NA No FP,No S,Yes 0
<br /> MW-5(55) 05/15/96 928 2666 -1738 43,000 6,500 5,000 790 3,400 <500* No FP,No S,Yes 0
<br /> MW-5 08/22/96 928 2714 -1786 58,000 8,700 8,200 880 4,500 <500* No FP,No S,Yes 0
<br /> MW-5 11/25/96 928 2733 -1805 53,000 7,000 6,100 800 4,000 <600** No FP,No S,Yes 0
<br /> MW-5 02/24/97 928 2330 -1402 40,000 4,400 4,700 590 3,100 <700** No FP,No S,Yes 0
<br /> MW-5 05/19/97 928 2321 -1393 43,000 5,500 4,300 660 3,800 <300* No FP,No S,Yes 0
<br /> MW-5(54) 08/21/97 928 2429 -1501 32,000 5,200 3,900 560 3,100 <1,000** No FP,No S,Yes 0
<br /> MW-5(55) 11/17/97 928 2533 -1605 10,000 11700 1,300 210 1,100 <500** No FP,No S.Yes 0
<br /> Emcon
<br /> N\-XLSvD80N4610V21297M1 XLS 2127198
<br /> Shedl
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