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w w w w w ww rw w ww 962 Historical Groundwater Monitoring Data 7-Eleven Store No 20632 4627 DaVlnci Drive Stockton, California Well ID/ Ethyl- MTBE MTBE Dissolved Elevation Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPE ETBE TAME Oxygen DTW SPT WTE (TOC) Date (p9IL) (pg/L) (pgIL) (pg/L) (p9IL) (pg/L) (pg/L) (p9IL) (pg/L) (pg/L) (pJIL) (mg1L) (feet) (feet) (feet) MW-5 257 021'17199 85 <1 30 110 890 49 62 <20 <5 <5 <5 0 7 5 79 0 00 -3 22 05/21/99 242 086 1 141 172 220 -- 188 <20 <5 <5 <5 09 700 000 -443 08128199 366 <0 3 321 348 296 -- 64 <20 <5 <5 e5 0 8 6 70 0 00 -4 13 11/24/99 21 4 129 142 149 257 269 281 <20 <5 <5 <5 1 1 7 50 0 00 -4 93 02/02/00 296 <03 265 063 284 35 3 751 <20 <5 <5 <5 11 650 000 -393 05/16/00 <0 5 <0 5 099 <1 <100 -- 160 <100 <4 <4 <4 06 637 0 00 -380 08/08/00 28 <0 5 44 22 <100 -- 160 <120 <5 <5 <5 04 735 000 -47 11/15/00 2 9 <0 5 36 28 170 -- 59 <50 <2 <2 <2 06 675 000 -418 02/07/01 <0 5 <05 0 72" <15 <100 -- 24 <50 <2 <2 <2 07 660 000 -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 0 67 1 <100 -- 26 <50 <2 <2 <2 01 7 57 0 00 -500 11/05/01 22 <0 5 <05 12 L 130 — 76 <20 <5 <5 <5 1 0 740: 40R:_0 -483 01/09/02 <5 <5 <5 <5 <50 — 52 <20 <5 <5 <5 09 500 00 EXPLANAT14d 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 pglL=micrograms per liter RIPE=Dr-isopropyl ether mg/L=Milligrams per liter ETBE=Ethyl tertiary-butyl-ether —=Not avaiiablelnot sampled TAME=Tertiary amyl-methyl ether TOC=Top of casing elevation(in feet above mean sea level) OTW=Depth to water Method Blank Contamination Method blank contains target analyte at a reportable level 7-11120632—tbl As 3 of 3 03-06-02