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i • i Table 2 Groundwater Elevation Analytical Data Chevron Service Station ff9-4275 2905 Benjamin Holt Drive Stockton,Califomia Well Groundwater Depth Ethyl- Xylenes Well Date Elevation Elevation to Water TPHg Benzene Toluene benzene (total) MtBE ID Sampled (ft MSL) (ft MSL) (ft TOC) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) GM-11 04/01/97 1029 8,800 65 50 28 24 <5 0 GM-2 04/01/97 920 810 12 <05 17 18 <5 0 GM-3 04/01/97 — 1208 27,000 250 17 730 960 <50 GM-4 04/01/97 853 990 72 29 44 37 <5 0 GM-5 04101/97 1060 350 <0 5 <05 <05 <0 5 11 GM-6 04/01/97 1009 25,000 1,600 62 960 4,000 <250 GM-7 04/01/97 - 1040 19,000 210 79 330 1 300 51 GM-8 04/01/97 - 1045 4,900 44 39 120 100 11 GM-9 04/01/97 -- 1060 24,000 340 18 130 340 110 FIELD 03/02/01 (S) -- - <50 <050 <0 50 <050 <0 50 <2 5 BLANK 03/02101a (K) _ <50 <050 <0 50 <050 <0 50 <0 50 TRIP 12/08/94 -- <50 <0 5 <0 5 <0 5 <0 5 BLANK 03/08/95 - <50 <0 5 <0 5 <0 5 <05 M01/95 <50 <0 5 <0 5 <05 <05 09111/95 -- <50 <0 5 <0 5 <05 <0 5 12/05/95 -- <50 <0 5 <0 5 <05 <0 5 03/18/96 -- <50 <0 5 <0 5 <0 5 <0 5 06/18/96 - - <50 <0 5 <0 5 <0 5 <0 5 <50 09124/96 -- - <50 <0 5 <0 5 <0 5 <0 5 <5 0 12/04/96 <50 <0 5 <0 5 <0 5 <0 5 <50 02/25/97 <50 <0 5 <0 5 <0 5 <0 5 <5 0 05/06/97 -- <50 <0 5 <0 5 <0 5 <0 5 <5 0 06/18/97 <50 <0 5 <0 5 <0 5 <0 5 <5 0 09/29/97 -- -- <50 <0 5 <0 5 <05 <05 <50 11/25/97 <50 <0 5 <0 5 <0 5 <0 5 <2 5 03126/98 <50 <0 5 <0 5 <05 <05 <2 5 Trip Blank 06/24/98 — <50 <05 <0 5 <0 5 <05 <2 5 (Cont) 09/10/98 - <50 <05 <0 5 <05 <0 5 <2 5 12!17198 -- <50 <05 <05 <0 5 <05 <25 Chevran1942751QMM9 4275 NF 15