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TAB91
<br /> HISTORICAL GROUNDWATER MONITORING DATA -
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton, California
<br /> Elevation
<br /> Fop of Static Water Water Depth to Ethyl- Total Dissolved
<br /> Well ID Casing(feet Levei Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen
<br /> &Sample Date msl) (feet bgs) (feet ms]) (feet bgs) pg/L pg/L pg/L pg/L pg/L ug/L (ppm) Observations
<br /> MW-4 58 2/16195 1234 39 25 -2691 370 77,000 9,200 13,000 1,700 8,000 NA NA No FP,No S,O=NE
<br /> 58 5/17/95 1234 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 1234 3430 -2196 74,000 6,400 10,000 1,600 7,600 NA NA No FP,No S,Yes 0
<br /> 59 11/29/95 1234 3442 -2208 92,000 7,800 12,000 1,700 7,600 NA NA No FP,No S,Yes O
<br /> 2/27/96 1234 3167 -19 33 61,000 7,600 8,500 1,600 6,600 NA NA No FP,No S,Yes 0
<br /> 58 5/15/96 1234 3009 -17 75 64,000 8,100 8,600 1,600 6,400 <500*[1] NA No FP,No S,Yes O
<br /> 8/22196 1234 3072 -18 38 79,000 9,200 11,000 1,800 7,400 <700**[I] NA No FP,No S,Yes 0
<br /> 11/25/96 1234 3078 -1844 72,000 8,800 9,300 1,600 6,100 <500*[I] NA No FP,No S,Yes 0
<br /> 2/24/97 1234 26 82 -1448 40,000 6,700 2,200 900 2,600 <600**[11 NA No FP,No S,Yes O
<br /> 5/19/97 1234 2667 -1433 57,000 8,700 6,700 1,300 5,000 <600*[1] NA No FP,No S,Yes O
<br /> 38 8/21197 1234 2774 -1540 48,000 7,200 5,000 1,200 3,900 <1,000**[1] NA No FP,No S,Yes O
<br /> 59 11/17/97 1234 28 79 -1645 12,000 4,800 180 370 280 58 NA No FP,No S,Yes O
<br /> 59 2/9198 1234 26 27 -13 93 17,000 5,200 540 690 730 <500**(1] NA No FP,No S,Yes 0
<br /> 58 5/22198 1234 22 21 -987 16,700 5,360 611 663 715 <100 NA No FP,No S,Yes 0
<br /> 58 8112/98 1234 2234 -1000 19,300 5,880 890 678 911 <20 NA No FP,No S,Yes O
<br /> 58 11/9/98 1234 2342 -11 08 23,600 6,340 720 692 875 45 9 NA No FP,No S,Yes 0
<br /> 58 2/17/99 1234 2265 -1031 21,300 6,970 950 907 1,030 666 NA No FP,No S,Yes 0
<br /> 58 5/25199 1234 2202 -968 53,700 9,870 4,870 <100 4,600 64 6 NA No FP,No S,Yes 0
<br /> 58 8/18/99 12 34 2309 -1075 34,400 7,390 4,200 1,260 3,610 57 2 NA No FP,No S,Yes 0
<br /> 58 12/17/99[2] 1234 2398 -1164 14,700 5,030 85 9 538 291 58 6 NA No FP,No S,O-NE
<br /> 58 2122/00 12 34 23 26 -1092 1,810 477 208 73 6 182 622 NA No FP,No S,Yes O
<br /> 59 6/22/00 1234 21 97 -9 63 12,000 4,200 35 2940 224 488 NA No FP,No S,Yes 0
<br /> 8/30/00 1234 2299 -1065 27,200 8,180 687 748 1,170 90 NA No FP,No S,Yes 0
<br /> 11/21/00 1234 2369 -11 35 13,200[4] 4,540 <50 438 306 57 6 NA No FP,No S,Yes O
<br /> 2/15/01 1234 23 78 -1144 24,800[6] 6,200 188 790 566 55 2 10 No FP,No S,O=NE
<br /> 5/17/01 1234 23 01 -1067 16,600[5) 4,720 117 498 514 582 16 No FP,No S,Yes 0
<br /> 8/16/01 1234 2434 -1200 20,000 4,900 110 830 910 <100* 19 No FP,No S,Yes 0
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<br /> Arco2168 QUAR I ERLY DA I A X!S
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