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AEI •
<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 JD Casing Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen
<br /> &Sample Date (feet msl) (feet bgs) (feet ms]) (feet bgs) µg/L. µg/L µg/L pg/L pg/L µg/L (ppm) Observations
<br /> MW-4 58 02/16/95 1234 3925 -2691 370 77,000 9,200 13,000 1,700 8,000 NA NA No FP,No S,O=NE
<br /> 58 05/17/95 1234 3465 -2231 89,000 11,000 17,000 2,100 9,900 NA NA No FP,No S,O=NE
<br /> 59 08/15/95 1234 3430 -21 96 74,000 6,400 10,000 1,600 7,600 NA NA No FP,No S,Yes O ,
<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 0
<br /> 02/27/96 1234 31 67 -1933 61,000 7,600 8,500 1,600 6,600 NA NA No FP,No S,Yes O
<br /> 58 05/15/96 1234 3009 -1775 64,000 8,100 8,600 1,600 6,400 <500*[1] NA No FP,No S,Yes 0
<br /> 08/22/96 1234 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 1234 3078 -1844 72,000 8,800 9,300 1,600 6,100 <500*[1] NA No FP,No S,Yes 0
<br /> 02/24/97 1234 26 82 -1448 40,000 6,700 2,200 900 2,600 <600**[1] NA No FP,No S,Yes O
<br /> 05/19/97 1234 2667 -1433 57,000 8,700 6,700 1,300 5,000 <600*[1] NA No FP,No S,Yes 0
<br /> 38 08/21/97 1234 2774 -1540 48,000 7,200 5,000 1,200 3,900 <1,000**[I] NA No FP,No S,Yes 0
<br /> 59 11/17/97 1234 2879 -1645 12,000 4,800 180 370 280 58 NA No FP,No S,Yes O
<br /> 59 02/09/98 1234 2627 -1393 17,000 5,200 540 690 730 <500**[1] NA No FP,No S,Yes O
<br /> 58 05/22/98 1234 2221 -9 87 16,700 5,360 611 663 715 <100 NA No FP,No S,Yes O
<br /> 58 08/12/98 1234 2234 -1000 19,300 5,880 890 678 911 <20 NA No FP,No S,Yes O
<br /> 58 11/09/98 1234 2342 -1108 23,600 6,340 720 692 875 459 NA No FP,No S,Yes O
<br /> 58 02/17/99 1234 2265 -1031 21,300 6,970 950 907 1,030 666 NA No FP,No S,Yes 0
<br /> 58 05/25/99 1234 2202 -968 53,700 9,870 4,870 <100 4,600 64 6 NA No FP,No S,Yes O
<br /> 58 08/18/99 1234 2309 -1075 34,400 7,390 4,200 1,260 3,610 572 NA No FP, No S,Yes 0
<br /> 58 12117/99[2] 1234 2398 -1164 14,700 5,030 85 9 538 291 58 6 NA No FP,No S,O=NE
<br /> 58 02/22/00 1234 23 26 -1092 1,810 477 208 73 6 182 622 NA No FP,No S,Yes 0
<br /> 59 06/22/00 1234 21 97 -9 63 12,000 4,200 35 2940 224 488 NA No FP,No S,Yes O
<br /> 08/30/00 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 <50 438 306 576 NA No FP,No S,Yes 0
<br /> 02/15/01 1234 23 78 -1144 24,800[6] 6,200 188 790 566 55 2 1 0 No FP,No S,O=NE
<br /> C IARC0121681QTRLYITABLES12168QUARTERLY DATA XLS
<br /> 4 of 8 Delta 4125101
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