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<br /> HISTORICAL GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton,California
<br /> v a
<br /> E!e at on
<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 ms]) (feet bgs) }µg/L µglL µg/L µg/L gWL µg/L (ppm) Observations
<br /> MW-6 47 2116/95 893 3706 -28 13 300 39,000 6,400 5,200 850 41400 NA NA No FP,No S,O=NE
<br /> 46 5/17195 3064 -2171 130,000 9,900 16,000 1,800 10,000 NA NA No FP,No S,O=NE
<br /> 46 8/15195 3022 -2129 120,000 7,700 9,700 1,500 8,900 NA NA No FP,No S,Yes 0
<br /> 45 11/29/95 3030 -2137 160,000 8,200 11,000 1,700 10,000 NA NA No FP,No S,Yes 0
<br /> 2/27/96 2755 -1862 96,000 10,000 13,000 1,400 8,100 NA NA No FP,No S,Yes O
<br /> 47 5115196 2579 -1686 99,000 8,800 12,000 1,400 8,000 <900**[I] NA No FP,No S,Yes 0
<br /> 8122/96 2648 -1755 98,000 8,200 7,300 1,600 9,000 <1,000**[ll NA No FP,No S,Yes 0
<br /> 11/25/96 2661 -1768 84,000 9,300 9,500 1,500 8,800 <900**[I] NA No FP,No S,Yes O
<br /> 2124/97 2277 -1384 140,000 9,700 11,000 1,400 8,500 <2 000**[l] NA No FP,No S,Yes 0
<br /> 5119/97 2253 -1360 69,000 7,900 5,000 1,200 7,700 <600*[1] NA No FP,No S,Yes 0
<br /> 45 8121197 2365 -1472 86,000 7,400 4,000 1,300 7,400 <1,000**[11 NA No FP,No S,Yes 0
<br /> 41 11/17/97 2470 -1577 42,000 5,400 2,100 1,100 6,600 <67 NA No FP,No S,Yes 0
<br /> 43 2/9198 2201 -1308 62,000 12,000 7,000 1,300 7,400 <1,000**[1] NA No FP,No S,Yes 0
<br /> 42 5122/98 1814 -921 66,100 9,740 4,620 1,180 6,820 <100 NA No FP,No S,Yes O
<br /> 42 8112198 IS 42 -949 54,700 7,670 2,340 1,230 6,800 <200 NA No FP,No S,Yes 0
<br /> 42 1119198 1973 -1080 15,900 1,080 3 l S 267 1,240 <2 NA No FP,No S,Yes O
<br /> 45 2117199 1879 986 53,500 9,870 2,720 1,540 8,320 <2 NA No FP,No S,Yes O
<br /> 45 5125/99 18 12 -919 43,900 7,020 1,880 1,520 8,290 <2 NA No FP,No S,Yes 0
<br /> 45 8118199 1926 -1033 40,900 6,260 1,590 1,470 7,460 478 NA No FP,No S,Yes 0
<br /> 45 12117/99[21 2008 -11 15 4,080 536 149 122 756 <2 NA No FP,No S,O=NE
<br /> 45 2/22100 1929 -1036 38,200 8,430 1,800 1,330 6,390 <2 NA No FP,No S,Yes 0
<br /> 48 6122100 18 15 -922 2,150 <2 5 15 14 <2 NA No FP,No S,Yes 0
<br /> 8/30100 19 12 -1019 37,900 5,290 1,260 1,280 5,570 <2 NA No FP,No S,Yes 0
<br /> 11/21/00 1983 -1090 30,100[5] 5,120 1,080 1,150 5,150 <2 NA No FP,No S,Yes 0
<br /> 2115101 1972 -1079 58,20016] 5,930 1,400 1,540 5,820 <2 1 1 No FP,No S,O=NE
<br /> 5117/01 19 11 -1018 31,700[5] 5,210 1,090 1,300 5,020 <40 09 No FP,No S,Yes 0
<br /> 8/16101 2050 -1157 39,000 5,000 1,300 1,600 5,500 <50* 07 No FP,No S,Yes 0
<br /> 1216101 2150 -1257 28,000 5,800 <100 1,300 4,800 <100* 06 No FP,No S,Yes O
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<br /> Arco 2168_Quarlcrly_Data xIs
<br /> G of 8 Delta
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