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• T E 1 • ~
<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 ID Casing Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen
<br /> &Sample Date (feet msl) (feet bgs) (feet msl) (feet bgs) pg/L pg/L µg/L µg/L pg/L pg/L (ppm) Observations
<br /> MW-1 54 02/16/95 1045 37 11 -2666 35 5 36,000 11,000 460 990 3,200 NA NA No FP,No S,O=NE
<br /> 53 05/17/95 1045 3261 -22 16 38,000 12,000 790 1,100 3,400 NA NA No FP,No S,O=NE
<br /> 54 08/15/95 1045 3213 -2168 45,000 10,000 330 1,000 3,300 NA NA No FP,No S,Yes O
<br /> 54 11/29/95 1045 3232 -2187 46,000 9,800 370 1,100 2,900 NA NA No FP,No S,Yes O
<br /> 02/27/96 Well Inaccessible
<br /> 53 05/15/96 1045 27 88 -1743 34,000 9,400 670 1,000 2,100 <25*[1] NA No FP,No S,Yes O
<br /> 53 08/22/96 1045 2850 -1805 35,000 9,100 1,000 1,000 2,000 <500*[I] NA No FP,No S,Yes O
<br /> 11/25/96 1045 2871 -1826 37,000 7,900 460 870 1,500 <500*[1] NA No FP,No S,Yes O
<br /> 02/24/97 1045 2466 -1421 37,000 8,300 740 900 2,200 <500*[1] NA No FP,No S,Yes O
<br /> 05/19/97 1045 2454 -1409 30,000 8,200 310 780 1,100 <600*[1] NA No FP,No S,Yes O
<br /> 54 08/21/97 1045 2562 -15 17 28,000 8,200 380 860 1,100 <2,000**[I] NA No FP,No S,Yes O
<br /> 54 11/17/97 1045 2667 -1622 23,000 9,300 580 820 1,300 <1,000**[]] NA No FP,No S,Yes O
<br /> 54 02/09/98 1045 2409 -1364 20,000 6,800 360 700 1,100 <1,000**[I] NA No FP,No S,Yes O
<br /> 53 05/22/98 1045 2008 -963 20,700 6,650 413 588 1,030 <100 NA No FP,No S,Yes O
<br /> 53 08/12/98 1045 2026 -981 22,000 8,690 510 785 1,220 <2 NA No FP,No S,Yes O
<br /> 53 11/09/98 1045 21 40 -1095 21,300 7,420 289 628 1,020 2420 NA No FP,No S,Yes O
<br /> 53 02/17/99 1045 2060 -10 15 2,650 834 483 902 138 2380 NA No FP,No S,Yes O
<br /> 53 05/25/99 1045 1996 -951 22,600 8,410 291 854 1,160 3080 NA No FP,No S,Yes O
<br /> 53 08/18/99 1045 21 95 -11 50 19,400 7,860 228 670 958 11 60 NA No FP,No S,Yes O
<br /> 53 12/17/99[2] 1045 2190 -1145 15,900 5,630 121 379 579 3440 NA No FP,No S,O=NE
<br /> 53 02/22/00 1045 21 13 -1068 19,700 8,830 228 800 932 1930 NA No FP,No S,Yes O
<br /> 54 06/22/00 1045 1989 -944 19,900 6,020 139 401 486 1320 NA No FP,No S,Yes O
<br /> 08/30/00 1045 2092 -1047 18,300 8,600 254 654 650 228 NA No FP,No S,Yes O
<br /> 11/21/00 1045 2160 -11 15 6,620[4] 1,570 703 908 199 128 NA No FP,No S,Yes O
<br /> 02/15/01 1045 2167 -1122 11,300[7] 3,490 136 450 329 226 1 0 No FP,No S, O=NE
<br /> MW-IB 08/30/00 1026 2125 -1099 750 504 160 69 12 262 <2 NA No FP,No S,Yes O
<br /> 11/21/00 1026 21 36 -11 10 1,500[4] 506 165 25 5 55 3 <2 NA No FP,No S,Yes O
<br /> 02/15/01 1026 2162 -11 36 721 [7] 233 102 175 242 <2 08 No FP,No S,O=NE
<br /> MW-1C 08/30/00 1021 22 19 -11 98 1050 53 7 63 <2 <2 406 <2 NA No FP,No S,Yes O
<br /> 11/21/00 1021 21 69 -1148 62 3 [4] 569 1 21 0 999 3 51 <2 NA No FP,No S,Yes O
<br /> 02/15/01 1021 21 80 -11 59 <50 9 88 1 42 1 64 259 <2 08 No FP, No S,O=NE
<br /> C IARC0121681QTRLYITABI ES12168QUARTERLY DATA XIS
<br /> 1 of 8 Delta 4125/01
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