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• 32 � Historical Groundwater Monitoring Data 7-Eleven Store No 20632 4627 DaVlncl Drive Stockton,California r ! Ethyl- MTBE MTBE Dissolved n Benzene Toluene Benzene Xylene TPH-G8020 8260 TBA DIPE ETRE TAME Oxygen DTW SPT WTE Date (Ng/L) (pglL) (Iig/L) (Ng1L) (NglL) (lig1L) (µglL) (pgfL) (Ng1L) (Ng/L) (pg1L) (mg1L) (feet) (feet) (feet) 257 02/17/99 85 <1 30 110 890 49 62 <20 <5 <5 <5 07 579 000 -322 05/21/99 242 086 141 172 220 -- 188 <20 <5 <5 <5 09 700 000 -443 08/28/99 366 <0 3 321 348 296 -- 64 <20 <5 <5 <5 08 670 000 -413 11/24/99 214 129 142 149 257 259 281 <20 <5 <5 <5 1 1 750 000 -493 02/02/00 296 <0 3 265 063 284 353 761 <20 <5 <5 <5 1 1 650 000 -393 0 5 0 99 05/16/00 <0 5 < <1 <100 -- 160 <100 <4 <4 <4 1 6 637 000 -380 08/08/00 28 70 5 44 22 <100 — 160 <120 <5 <5 <5 04 735 000 478 11/15/00 29 <0 5 36 28 170 — 59 e50 <2 <2 <2 06 675 000 -418 02/07/01 <05 <0 5 L 0 72* <1 5 <100 -- 24 <50 <2 <2 <2 07 660 0 00 403 05/23/01 12 <0 5 <0 5 <1 <100 — 86 <50 <2 <2 <2 20 693 000 436 08/21/01 <0 5 <0 5 067 1 <100 — 26 <50 <2 <2 <2 01 757 000 -500 11/05/01 22 <0 5 <0 5 1 2 130 -- 76 1 <20 <5 <5 <5 10 740 0 00 -483 EXPLANATI TPH-G=Total petroleum hydrocarbons as gasoline SPT=Separate phase hydrocarbon thickness E=Estimated result Result concentration exceeds the calibration range MTBE=Methyl tert butyl ether WTE=Water table elevation G=Elevated reporting limit The reporting limit is elevated due to matrix interference TBA=Tert Butanol pg/L=micrograms per liter DIPE=Di isopropyl ether mg/L=Milligrams per liter ETBE=Ethyl tertiary butyl ether —=Not avadablelnot sampled TAME=Tertlery amyl methyl ether TOC=Top of casing elevation(in feet above mean sea level) DTW=Depth to water Method Blank Contamination Method blank contains target analyte at a reportable level 7-11120632 tbl As 3 of 3 11-19-01