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<br /> TABLE 2
<br /> Historical Groundwater Monitoring Data
<br /> 7-Eleven Store#17334
<br /> 4501 North Pershing Avenue
<br /> Stockton, California
<br /> Well IDI Ethyl- MTBE MTBE - - Dissolved
<br /> Elevation Date Benzene Toluene Benzene Xylene TPH-G TPH-D 8020 8260 TBA DIPE ETBE TAME Oxygen DTW SPT WTE
<br /> T0� NIL PAL) Pg�- (µg/L (µ91l.}_ (P µ9ILj _(P9/L WWW (Pgt-L P9/tW-Jµ-gLLl (mgl)- (feet? _(feet-(fee-)-
<br /> MW-4
<br /> 6 69 12/19/97 51 <5 18 61 3,600 -- 3,000 3,800 <1,000 <250 <250 <250 01 1879 000 -1210
<br /> 03/22198 61 2 7S 43 2,600 - - 3,100 <4,000 <200 <200 <200 02 1418 000 -749
<br /> 06/15/98 24 54 62 13 3,200 -- 2,700 <2,500 <125 <125 <125 19 1417 000 -889
<br /> 08/25198 26 47 79 29 1,800 -- 1,220 <1250 <125 <125 <125 - 1558 000 -889
<br /> 12/29/98 <0 3 <0 3 <0 3 147 2,200 3,360 845 <100 <100 <100 1 0 1542 000 -B 73
<br /> 02/17/99 <5 <5 63 <5 3,400 -- 3,100 4,300 <1000 <250 <250 <250 03 1460 000 -791
<br /> 05/21/99 44 528 10.9 384 1,750 - -- 4,710 <400 <100 <100 <100 05 1443 000 -774
<br /> 08/28/99 <3 <3 <3 <6 2,910 3,340 2,940 <400 <100 <100 <100 09 1600 000 -931
<br /> 11/24/99 <03 3.95 727 160 2,180 -- 6,070 7,470 <800 <200 <200 <200 169 1597 000 -928
<br /> MW-5A
<br /> 7 22 12/29/98 10,400 33,400 4,580 26,900 88,600 -- 17,200 <2000 <500 <500 <500 08 1552 000 -830
<br /> 02/17/99 4,400 19,000 2,300 17,000 90,000 3,900 4,800 <1000 <250 <250 <250 05 1469 000 -747
<br /> 05/21/99 7,010 21,100 2,890 16,000 103,000 - -- 10,400 <1000 <250 <250 <250 05 1456 000 -734
<br /> 08/28/99 6,420 21,700 2,290 14,000 87,600 - 11,800 11,700 <1,000 <250 <250 <250 09 1615 000 -893
<br /> 11/24/99 7,230 20,900 2,780 15,800 1,120,000 -_ 7,000 7,680 _- <800 <200 <200 <200 1 59-16-10.- 0 00 -888
<br /> MW-5B - -
<br /> 746 12/29/98 3,410 19,800 2,610 16,700 63,400 1,480 <100 <25 <25 <25 12 1576 1100 -8 30
<br /> 02/17/99 11 240 120 780 5,300 <5 <5 <20 <5 <5 <5 03 1490 000 -744
<br /> 05121/99 100 214 38 2,610 8,780 30 <100 <25 <25 <25 02 1479 000 -733
<br /> 08/28/99 259 151 262 286 2,340 - 102 553 <20 <5 <5 <5 10 1635 000 -8 89
<br /> 11/24/99 926 224 397 274 _-1,260 877 _ 882 221 _ <51 _<5 <5 _ 1 36- 16 30 000 -884
<br /> Explana#lost- -- - - ------ --- ---- --- - - -- - - --- - - - - - --
<br /> -=Not available/not sampled TOC=Top of casing elevation(in feet above mean sea level)
<br /> TPH G=Total petroleum hydrocarbons-as-gasoline DTW=Depth to water
<br /> MTBE=Methyl-tert butyl ether SPT=Separate-phase hydrocarbon thickness
<br /> TBA=Tertiary Butanol WTE=Water table elevation
<br /> DIPE=Di-isopropyl ether Vg/L=Micrograms per liter
<br /> ETBE=Ethyl tertiary-butyl ether mg1L=Milligrams per liter
<br /> TAME=Tertiary-amyl-methyl ether ND=Not Detected
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<br /> 17334T82 WK4 Page 2 of 2
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