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TO 1 i r
<br /> HISTORICAL GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton Cahforma
<br /> Elevation
<br /> Top of Static Water Water Depth to Ethyl Total Dissolved
<br /> Well 1D Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MtBE Oxygen
<br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) ug1L ug/L ug/L ug/L ug/L ug/L (ppm)
<br /> MW 3 2/15/2001 2079 1121 39,800[6] 9 680 176 2,420 1230 603 06
<br /> (cont) 5/17/2001 2004 1046 27,100[5] 8 790 219 2,270 1,210 <10 05
<br /> 8/16/2001 2132 1174 30 000 8,700 320 2,800 1,800 <100* 09
<br /> 12/6/2001 2245 1287 26,000[8] 10,000 <200 2,000 770 <100* 08
<br /> 2/142002 2090 -1132 25,000 6,900 380 2,000 1,500 <100[10] 19
<br /> 6/132002 2109 -1151 22,000 5,400 63 1,800 750 <50[10] 08
<br /> 81222002 2213 -1255 24,000 9,600 100 2200 780 <25 09
<br /> 11/1312002 2300 -1342 <50 000 8,400 <500 1,500 <500 <500 --
<br /> 2112/2003 - -- Not sampled
<br /> MW-4 58 2/16/1995 1234 3925 2691 370 77 000 9,200 13,000 1,700 8,000 NA NA
<br /> 58 5/17/1995 3465 2231 89,000 11,000 17 000 2,100 9,900 NA NA
<br /> 59 8/15/1995 3430 2196 74 000 6,400 10,000 1,600 7,600 NA NA
<br /> 59 11/29/1995 3442 2208 92 000 7,800 12,000 1 700 7,600 NA NA
<br /> 2/27/1996 3167 1933 61,000 7,600 8 500 1,600 6,600 NA NA
<br /> 58 5/15/1996 3009 1775 64 000 8,100 8,600 1 600 6,400 <500*[1] NA
<br /> 8/22/1996 3072 1838 79,000 9,200 11 000 1,800 7,400 <700**[1] NA
<br /> 11/25/1996 3078 -1844 72,000 8 800 9,300 1,600 6,100 <500*[1] NA
<br /> 2/24/1997 2682 -1449 40,000 6,700 2,200 900 2,600 <600**[l} NA
<br /> 5/19/1997 2667 -1433 57,000 8 700 6,700 1,300 5,000 <600*[1] NA
<br /> 38 821/1997 2774 -1540 48 000 7,200 5,000 1,200 3,900 <1,000**[1} NA
<br /> 59 11/17/1997 2879 -1645 12 000 4,800 180 370 280 58 NA
<br /> 59 2/9/1998 2627 -1393 17 000 5200 540 690 730 <500**[1] NA
<br /> 58 5/22/1998 2221 -987 16,700 5,360 611 663 715 <100 NA
<br /> 58 8/12/1998 2234 1000 19 300 5,880 890 678 911 <20 NA
<br /> 58 11/9/1998 2342 1108 23,600 6,340 720 692 875 459 NA
<br /> 58 2/17/1999 2265 1031 21 300 6 970 950 907 1 030 666 NA
<br /> 58 5/25/1999 2202 968 53,700 9 870 4,870 <100 4,600 646 NA
<br /> 58 8/18/1999 2309 1075 34 400 7 390 4200 1 260 3 610 572 NA
<br /> 58 12117/99[2] 2398 -1164 14 700 5 030 85 9 538 291 586 NA
<br /> 58 2/22/2000 2326 -1092 1,810 477 208 736 182 622 NA
<br /> 59 6/22/2000 2197 -963 12,000 4,200 35 2940 224 489 NA
<br /> 8/30/2000 2299 1065 27,200 8,180 687 748 1,170 90 NA
<br /> 11/21/2000 2369 -1135 13,200[4] 4,540 <50 438 306 576 NA
<br /> 2/152001 2378 -1144 24,800[6] 6,200 188 790 566 55 2 10
<br /> 5117!2001 2301 -1067 16,600[5] 4,720 117 498 514 592 16
<br /> 8/16/2001 2434 -1200 20,000 4,900 110 830 910 <100* 19
<br /> 12/62001 2545 -13 11 <SO 000 6,200 <500 800 660 <500* 10
<br /> K VS BP ARC0\021681Quartvly\1 QTR 03\2168 GVVMR 1Q03
<br /> 4of9
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