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<br /> • TABL'>rli
<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(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen
<br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) pg/L }iglL µg/L µglL µg/L pg/L (ppin) Observations
<br /> MW-4 58 2/16195 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 34 65 -2231 89,000 11,000 17,000 2,100 9,900 NA NA No FP,No S,O=NE
<br /> 59 8/15195 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 -22 08 92,000 7,800 12,000 1,700 7,600 NA NA No FP,No S,Yes O
<br /> 2127196 3167 -19 33 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 /> 8122196 3072 -1838 79,000 9,200 11,000 1,800 7,400 <700**[l] NA No FP,No S,Yes 0
<br /> 11/25/96 3078 -1844 72,000 8,800 9,300 1,600 6,100 <500*[1] NA No FP,No S,Yes O
<br /> 2124/97 2682 -1448 40,000 6,700 2,200 900 2,600 <600**[1] NA No FP,No S,Yes 0
<br /> 5/19/97 26 67 -14 33 57,000 8,700 6,700 1,300 5,000 <600*[1] NA No FP,No S,Yes O
<br /> 38 8/21197 2774 -1540 48,000 7,200 5,000 1,200 3,900 <1,000**[1] 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 /> 59 219/98 2627 -1393 17,000 5,200 540 690 730 <500**[l] 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 8/12/98 2234 -1000 19,300 5,880 890 678 911 <20 NA No FP,No S,Yes 0
<br /> 58 11/9/98 2342 -1109 23,600 6,340 720 692 875 459 NA No FP,No S,Yes O
<br /> 58 2117199 2265 -1031 21,300 6,970 950 907 1,030 666 NA No FP,No S,Yes 0
<br /> 58 5125199 2202 -9 68 53,700 9,870 4,870 <100 4,600 646 NA No FP,No S,Yes 0
<br /> 58 8/18199 23 09 -1075 34,400 7,390 4,200 1,260 3,610 572 NA No FP,No S,Yes 0
<br /> 58 12!17199[2] 2398 -1164 14,700 5,030 85 9 538 291 58 6 NA No FP,No S,O=NE
<br /> 58 2/22/00 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 /> 8/30100 2299 -1065 27,200 8,180 687 748 1,170 90 NA No IT,No S,Yes 0
<br /> 11/21/00 2369 -1 l 35 13,200[4] 4,540 <50 438 306 576 NA No FP,No S,Yes 0
<br /> 2115101 23 78 -1144 24,800[6] 6,200 188 790 566 552 to No FP,No S,O=NE
<br /> 5117101 2301 -1067 16,600[5] 4,720 117 498 514 58 2 16 No FP,No S,Yes O
<br /> 8116101 2434 -1200 20,000 4,900 110 830 910 <100* 19 No IP,No S,Yes 0
<br /> 1216/01 2545 -13 11 <50,000 6,200 <500 800 660 <500* 10 No FP,No S,Yes 0
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<br /> Arw_2 i 68_Quarterly_Data xis AofB Delia
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