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TAI
<br /> HISTORICAL GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton,California
<br /> Elevation
<br /> Top of Static Water Water Depth to Ethyl- Total Dissolved
<br /> Well 1D Casing(feet Level Elevation Screen TPHC Benzene Toluene benzene Xylenes MTBE Oxygen
<br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) pg/L µg/L lig/L µg/L n/L pg/L (ppm) Observations
<br /> MW-4 58 2/16/95 1234 3925 -2691 370 77,000 9,200 13,000 1,700 8,000 NA NA No FP,No S,O-NE
<br /> 58 5/17195 3465 2231 89,000 11,000 17,000 2,100 9,900 NA NA No FP,No S,O=NE
<br /> 59 8/15/95 3430 2196 74 000 6,400 10,000 1,600 7,600 NA NA No FP,No S,Yes O
<br /> 59 11/29/95 3442 -2208 92,000 7,800 12,000 1,700 7,600 NA NA No FP,No S,Yes O
<br /> 2/27196 3167 -1933 61,000 7,600 8,500 1,600 6,600 NA NA No FP,No S,Yes O
<br /> 58 5115196 3009 -1775 64,000 8,100 8,600 1,600 6,400 <500*[1] NA No FP,No S,Yes 0
<br /> 8/22/96 3072 -1838 79,000 9,200 11,000 1,800 7,400 <700**[1] NA No FP,No S,Yes 0
<br /> 11/25/96 3078 -1844 72,000 8,800 9,300 1,600 6,100 <500*[]] NA No FP,No S,Yes 0
<br /> 2/24197 2682 -1448 40,000 6,700 2,200 900 2,600 <600**[l] NA No FP,No S,Yes 0
<br /> 5/19/97 2667 1433 57,000 8,700 6,700 1,300 5,000 <600*[11 NA No FP,No S,Yes 0
<br /> 38 8/21/97 2774 1540 48,000 7,200 5,000 1,200 3,900 <1,000**[t] NA No FP,No S,Yes 0
<br /> 59 11/17/97 2879 -1645 12,000 4,800 180 370 280 58 NA No FP,No S,Yes 0
<br /> 59 2/9/98 2627 -13 93 17,000 5,200 540 690 730 <500**[]] NA No FP,No S,Yes 0
<br /> 58 5/22/98 2221 -987 16,700 5,360 611 663 715 <100 NA No FP,No S,Yes 0
<br /> 58 8112198 2234 -1000 19,300 5,860 890 678 911 <20 NA No FP,No S,Yes 0
<br /> 58 11/9198 2342 -1108 23,600 6,340 720 692 875 459 NA No FP,No S,Yes 0
<br /> 58 2/17/99 2265 -1031 21,300 6,970 950 907 1,030 666 NA No FP,No S,Yes 0
<br /> 58 5/25/99 2202 -968 53,700 9,870 4,870 <100 4,600 646 NA No FP,No S,Yes 0
<br /> 58 8118/99 2309 1075 34,400 7,390 4,200 1,260 3,610 572 NA No FP,No S,Yes 0
<br /> 58 12/17/99[2] 2398 11 64 14,700 5,030 85 9 538 291 586 NA No FP,No S,O=NE
<br /> 58 2122/00 2326 -1092 1,810 477 208 736 182 622 NA No FP,No S,Yes 0
<br /> 59 6/22/00 2197 -963 12,000 4,200 35 2940 224 488 NA No FP,No S,Yes 0
<br /> 8/30/00 2299 -1065 27,200 8,180 687 748 1,170 90 NA No FP,No S,Yes 0
<br /> 11/21/00 2369 -1135 13,200[4] 4,540 <50 438 306 576 NA No FP,No S,Yes 0
<br /> 2/15101 2378 -1144 24,800[61 6,200 188 790 566 552 10 No FP,No S,O=NE
<br /> 5117101 2301 -1067 16,600[5] 4,720 117 498 514 582 1 6 No FP,No S,Yes 0
<br /> 8/16/01 2434 1200 20,000 4,900 110 830 910 <100* 19 No FP,No S,Yes 0
<br /> 12/6101 2545 13 11 <50,000 6,200 <500 800 660 <500* 10 No FP,No S,Yes 0
<br /> 2114/02 23 89 -11 55 20,000 5,800 200 1,100 890 <100110] 10 No FP,No S,Yes O
<br /> 6/13/02 24 15 -11 81 21,000 4,400 170 860 790 <50[101 08 No FP,No S,Yes 0
<br /> Arco-2168 Quaneoly Data xis
<br /> 4o{g
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